13A-1

GROUP 13A

MULTIPORT FUEL
INJECTION (MFI)
<4G1>
CONTENTS

GENERAL INFORMATION . . . . . . . . 13A-2 ENGINE CONTROL RELAY

CONTINUITY CHECK . . . . . . . . . . . . . . . . . 13A-389
SERVICE SPECIFICATIONS. . . . . . . 13A-5 FUEL PUMP RELAY CONTINUITY
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-389
INTAKE AIR TEMPERATURE SENSOR
SEALANT. . . . . . . . . . . . . . . . . . . . . . 13A-5
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13A-389
ENGINE COOLANT TEMPERATURE
SPECIAL TOOLS. . . . . . . . . . . . . . . . 13A-6 SENSOR CHECK . . . . . . . . . . . . . . . . . . . . 13A-390
THROTTLE POSITION SENSOR CHECK . 13A-390
TROUBLESHOOTING . . . . . . . . . . . . 13A-9 OXYGEN SENSOR CHECK . . . . . . . . . . . . 13A-391
INJECTOR CHECK . . . . . . . . . . . . . . . . . . . 13A-393
ON-VEHICLE SERVICE. . . . . . . . . . . 13A-383
IDLE SPEED CONTROL (ISC) SERVO
THROTTLE BODY (THROTTLE (STEPPER MOTOR) CHECK . . . . . . . . . . . 13A-394
VALVE AREA) CLEANING . . . . . . . . . . . . . 13A-383
THROTTLE POSITION SENSOR INJECTOR . . . . . . . . . . . . . . . . . . . . . 13A-396
ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . 13A-383
REMOVAL AND INSTALLATION . . . . . . . . 13A-396
BASIC IDLE SPEED ADJUSTMENT . . . . . 13A-384
FUEL PRESSURE TEST . . . . . . . . . . . . . . 13A-384
THROTTLE BODY ASSEMBLY . . . . . 13A-398
FUEL PUMP CONNECTOR
REMOVAL AND INSTALLATION . . . . . . . . 13A-398
DISCONNECTION (HOW TO REDUCE
PRESSURIZED FUEL LINES) . . . . . . . . . . 13A-387 DISASSEMBLY AND REASSEMBLY . . . . . 13A-399
FUEL PUMP OPERATION CHECK . . . . . . 13A-387
COMPONENT LOCATION . . . . . . . . . . . . . 13A-388 ENGINE ECU AND ENGINE-A/T-ECU13A-401
REMOVAL AND INSTALLATION . . . . . . . . 13A-401
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-2 GENERAL INFORMATION

GENERAL INFORMATION
M1131000100949
The Multipoint Fuel Injection System consists of engine is idling, the idle speed control motor
sensors which detect the engine conditions, the operates to adjust the throttle valve bypass air
engine-ECU <M/T> or engine-A/T-ECU <A/T> which amount in accordance with the engine load
controls the system based on signals from these conditions in order to avoid fluctuations in the engine
sensors, and actuators which operate under the speed.
control of the engine-ECU <M/T> or engine-A/T-ECU
<A/T>. The engine-ECU <M/T> or engine-A/T-ECU IGNITION TIMING CONTROL
<A/T> carries out activities such as fuel injection The power transistor located in the ignition primary
control, idle speed control and ignition timing control. circuit turns ON and OFF to control the primary
In addition, the engine-ECU <M/T> or current flow to the ignition coil. This controls the
engine-A/T-ECU <A/T> is equipped with several ignition timing in order to provide the optimum
diagnosis modes which simplify troubleshooting ignition timing with respect to the engine operating
when a problem develops. conditions. The ignition timing is determined by the
FUEL INJECTION CONTROL engine-ECU <M/T> or engine-A/T-ECU <A/T> from
The injector drive times and injection timing are the engine speed, intake air volume, engine coolant
controlled so that the optimum air/fuel mixture is temperature and atmospheric pressure.
supplied to the engine to correspond to the SELF-DIAGNOSIS FUNCTION
continually-changing engine operation conditions. • When an abnormality is detected in one of the
A single injector is mounted at the intake port of each sensors or actuators related to emission control,
cylinder. Fuel is sent under pressure from the fuel the engine warning lamp (check engine lamp)
tank by the fuel pump, with the pressure being illuminates as a warning to the driver.
regulated by the fuel pressure regulator. The fuel • When an abnormality is detected in one of the
thus regulated is distributed to each of the injectors. sensors or actuators, a diagnosis code
Fuel injection is normally carried out once for each corresponding to the abnormality is output.
cylinder for every two rotations of the crankshaft. The • The RAM data inside the engine-ECU <M/T> or
firing order is 1-3-4-2. This is called sequential fuel engine-A/T-ECU <A/T> that is related to the
injection. The engine-ECU <M/T> or sensors and actuators can be read by means of
engine-A/T-ECU <A/T> provides a richer air/fuel the MUT-II/III. In addition, the actuators can be
mixture by carrying out "open-loop" control when the force-driven under certain circumstances.
engine is cold or operating under high load
conditions in order to maintain engine performance. OTHER CONTROL FUNCTIONS
In addition, when the engine is warm or operating 1. Fuel Pump Control
under normal conditions, the engine-ECU <M/T> or Turns the fuel pump relay ON so that current is
engine-A/T-ECU <A/T> controls the air/fuel mixture supplied to the fuel pump while the engine is
by using the oxygen sensor signal to carry out cranking or running.
"closed-loop" control in order to obtain the theoretical 2. A/C Relay Control
air/fuel mixture ratio that provides the maximum Turns the compressor clutch of the A/C ON and OFF.
cleaning performance from the three way catalyst. 3. Fan Motor Control
The revolutions of the radiator fan and condenser fan
IDLE AIR CONTROL are controlled in response to the engine coolant
The idle speed is kept at the optimum speed by temperature and vehicle speed.
controlling the amount of air that bypasses the 4. Purge Control Solenoid Valve Control
throttle valve in accordance with changes in idling (Refer to P.17-10, GROUP 17 − Engine And
conditions and engine load during idling. The Emission Control − Evaporative Emission Control
engine-ECU <M/T> or engine-A/T-ECU <A/T> drives System).
the idle speed control motor to keep the engine 5. EGR Control Solenoid Valve Control
running at the pre-set idle target speed in [Refer to P.17-14, GROUP 17 − Engine And
accordance with the engine coolant temperature and Emission Control − Exhaust Gas Recirculation
air conditioner load. In addition, when the air (EGR) System].
conditioner switch is turned off and on while the
 MULTIPORT FUEL INJECTION (MFI) <4G1>
GENERAL INFORMATION
13A-3
GENERAL SPECIFICATIONS
Items Specifications
Throttle body Throttle bore mm 45 <4G13>
50 <4G18>
Throttle position sensor Variable resistor type
Idle speed control servo Stepper motor type
Engine-ECU Identification No. E6T41771 <4G13>
<M/T> E6T41772 <4G18>
Engine-A/T-E Identification No. E6T37783
CU <A/T>
Sensors Manifold absolute pressure sensor Semiconductor type
Intake air temperature sensor Thermistor type
Engine coolant temperature Thermistor type
Oxygen sensor Zirconia type
Inhibitor switch <A/T> Contact switch type
Vehicle speed sensor <M/T> Magnetic resistive element type
Camshaft position sensor Hall element type
Crank angle sensor Hall element type
Detonation sensor Piezoelectric type
Power steering fluid pressure switch Contact switch type
Actuators Engine control relay Contact switch type
Fuel pump relay Contact switch type
Injector type and number Electromagnetic type, 4
Injector identification mark CDH 166 <4G13>
CDH 210 <4G18>
EGR control solenoid valve Duty cycle type solenoid valve
Purge control solenoid valve Duty cycle type solenoid valve
Fuel pressure Regulator pressure kPa 329
regulator
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-4 GENERAL INFORMATION

MULTI-POINT FUEL INJECTION SYSTEM DIAGRAM

1 Oxygen sensor (front) Power supply Engine- 1 Injector Engine control relay
2 Intake air temperature Ignition switch-IG ECU 2 Idle speed control Fuel pump relay
sensor Ignition switch-ST <M/T> servo (Stepper A/C compressor relay
3 Throttle position or motor)
A/C switch Ignition coil
sensor Engine- 3 EGR control
A/C load signal A/T-ECU Fan controller
4 Camshaft position solenoid valve
Power steering <A/T> Engine warning lamp
sensor fluid pressure 4 Purge control
solenoid valve Diagnosis output
5 Crank angle sensor switch Alternator G terminal
6 Manifold absolute Alternator FR
pressure sensor Oxygen sensor heater
terminal
7 Engine coolant Tachometer
Vehicle speed
temperature sensor sensor <M/T>
8 Detonation sensor Inhibitor switch
9 Oxygen sensor (rear) <A/T>

3 Throttle position 2 Idle speed control servo

sensor (Stepper motor)
2 Intake air
temperature sensor
6 Manifold absolute
pressure sensor
4 Camshaft position
sensor
Air
Fuel pressure
regulater 1 Injector M E A

To From
fuel tank fuel pump
EGR
valve
Canister
1 Oxygen sensor
(front)
7 Engine coolant
temperature sensor
Catalytic
converter 3 EGR control solenoid
8 Detonation sensor valve
4 Purge control solenoid
5 Crank angle sensor valve
9 Oxygen sensor (rear)

Catalytic converter

AK300962 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
SERVICE SPECIFICATIONS
13A-5
SERVICE SPECIFICATIONS
M1131000300590

Items Specifications
Basic idle speed r/min 750 ± 50
Throttle position sensor adjusting voltage mV 335 − 935
Throttle position sensor resistance kΩ 2.0 − 4.0
Idle speed control servo coil resistance (at 20°C) Ω 28 − 33
Intake air temperature sensor −20°C 13 − 17
resistance kΩ 0°C 5.3 − 6.7
20°C 2.3 − 3.0
40°C 1.0 − 1.5
60°C 0.56 − 0.76
80°C 0.30 − 0.42
Engine coolant temperature −20°C 14 − 17
sensor resistance kΩ 0°C 5.1 − 6.5
20°C 2.1 − 2.7
40°C 0.9 − 1.3
60°C 0.48 − 0.68
80°C 0.26 − 0.36
Oxygen sensor output voltage (at racing) V 0.6 − 1.0
Oxygen sensor heater front 4.5 − 8.0
resistance (at 20°C) Ω rear 4.5 − 8.0
Fuel pressure kPa Vacuum hose disconnection 324 − 343 at curb idle
Vacuum hose connection Approximately 265 at curb idle
Injector coil resistance (at 20°C) Ω 13 − 16

SEALANT
M1131000500356

Item Specified sealant Remark

Engine coolant temperature sensor 3M Nut Locking Part No. 4171 or equivalent Drying sealant
Threaded portion
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-6 SPECIAL TOOLS

SPECIAL TOOLS
M1131000600513

Tool Number Name Use

MB991502 MUT-II sub • Reading diagnosis code
assembly • MPI system inspection
• Measurement of fuel pressure

B991502

MB991955 MUT-III sub • Reading diagnosis code

A A: MB991824 assembly • MPI system inspection
B: MB991827 • Measurement of fuel pressure
C: MB991910
D: MB991911
MB991824 E: MB991825
B F: MB991826
MUT-III sub
assembly
A: Vehicle
MB991827 communication
interface (V.C.I.)
C
B: MUT-III USB
DO NOT USED cable
C: MUT-III main
harness A
MB991910
(Vehicles with
D CAN
communication
system)
D: MUT-III main
MB991911 harness B
(Vehicles without
E CAN
communication
system)
E: MUT-III
MB991825 measurement
adapter
F
F: MUT-III trigger
harness

MB991826

MB991955

MB991348 Test harness set • Measurement of voltage during

troubleshooting
• Inspection using an oscilloscope

MB991348
 MULTIPORT FUEL INJECTION (MFI) <4G1>
SPECIAL TOOLS
13A-7
Tool Number Name Use
MB991709 Test harness • Measurement of voltage during
troubleshooting
• Inspection using an oscilloscope
• Check of idle speed control servo

MD998478 Test harness • Measurement of voltage during

(3-pin, triangle) Troubleshooting
• Inspection using an oscilloscope

MB991536 Check harness • Measurement of voltage during

for throttle Troubleshooting
position sensor • Adjusting of throttle position sensor
adjustment
MB991536

MD998464 Test harness • Measurement of voltage during

(4-pin, square) Troubleshooting
• Inspection of oxygen sensor (front)

MB991658 Test harness • Measurement of voltage during

Troubleshooting
• Inspection of oxygen sensor (rear)

MB991658

MB991223 Harness set • Check at the ECU terminals

A: MB991219 A: Test harness A: Connector pin contact inspection
B: MB991220 B: LED harness B: Power circuit inspection
C: MB991221 C: LED harness C: Power circuit inspection
D: MB991222 adapter D: Commercial tester connection
D: Probe

MB991223
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-8 SPECIAL TOOLS

Tool Number Name Use

MD998709 Adaptor hose Measurement of fuel pressure

MD998742 Hose adaptor

MB991637 Fuel pressure

gauge set

MB991637

MD998706 Injector test set Checking the spray condition of

injectors

MD998706

MB991607 Injector test

harness

MB991607

MD998741 Injector test

adaptor

MD998741

MB991976 Injector test

holder assembly

MB991976
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-9
TROUBLESHOOTING
DIAGNOSIS TROUBLESHOOTING FLOW DIAGNOSIS FUNCTION
M1131150000502 M1131155500148
Refer to P.00-6, GROUP 00 − How to Use ENGINE WARNING LAMP
Troubleshooting/Inspection Service Points.
(CHECK ENGINE LAMP)
NOTE: If the engine-ECU <M/T> or engine-A/T-ECU
<A/T> is replaced, the steering lock cylinder and
ignition key should be replaced together with it. Engine warning lamp
(check engine lamp)

AK301108AB

If an abnormality occurs in any of the following items

related to the Multipoint Fuel Injection (MPI) system,
the engine warning lamp will illuminate.
If the lamp remains illuminated or if the lamp
illuminates while the engine is running, check the
diagnosis code output.

ENGINE WARNING LAMP INSPECTION ITEMS

Code No. Diagnosis item
− Engine-ECU<M/T> or engine-A/T-ECU<A/T>
P0105 Manifold absolute pressure sensor system
P0110 Intake air temperature sensor system
P0115 Engine coolant temperature sensor system
P0120 Throttle position sensor system
P0125* Feedback system monitor
P0130 Oxygen sensor (front) system <sensor 1>
P0135 Oxygen sensor heater (front) system <sensor 1>
P0136 Oxygen sensor (rear) system <sensor 2>
P0141 Oxygen sensor heater (rear) system <sensor 2>
P0170 Abnormal fuel system
P0201 No. 1 injector system
P0202 No. 2 injector system
P0203 No. 3 injector system
P0204 No. 4 injector system
P0300 Random cylinder misfire detection system
P0301* No. 1 cylinder misfire detection system
P0302* No. 2 cylinder misfire detection system
P0303* No. 3 cylinder misfire detection system
P0304* No. 4 cylinder misfire detection system
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-10 TROUBLESHOOTING

Code No. Diagnosis item

P0325 Detonation sensor system
P0335 Crank angle sensor system
P0340 Camshaft position sensor system
P0403 EGR control solenoid valve system
P0421 Warm up catalyst malfunction
P0443 Purge control solenoid valve system
P0500 Vehicle speed sensor system <M/T>
P0505 Idle speed control system
P0513 Immobilizer system
P0551* Power steering fluid pressure switch system
P1603* Battery back-up line system
NOTE: .
• If the engine warning lamp illuminates because of a malfunction of the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, communication between MUT-II/III and the engine-ECU <M/T> or
engine-A/T-ECU <A/T> is impossible. In this case, the diagnosis code cannot be read.
• After the engine-ECU <M/T> or engine-A/T-ECU <A/T> has detected a malfunction, the engine warning
lamp illuminates when the engine is next turned on and the same malfunction is re-detected.However, for
items marked with a "*" in the diagnosis code number column, the engine warning lamp illuminates only
on the first detection of the malfunction.
• After the engine warning lamp illuminates, it will be switched off under the following conditions.
• When the engine-ECU <M/T> or engine-A/T-ECU <A/T> monitored the power train malfunction three
times* met set condition requirements, it detected no malfunction.
*: In this case, "one time" indicates from engine start to stop.
• For misfiring malfunction, when driving conditions (engine speed, engine coolant temperature, etc.)
are similar to those when the malfunction was first recorded.
• Sensor 1 indicates, the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second closest to the engine.

METHOD OF READING AND ERASING 5. Erase the diagnosis codes.

DIAGNOSIS CODES
Refer to P.00-6, GROUP 00 − How to Use
INSPECTION USING MUT-II/III DATA LIST
Troubleshooting/Inspection Service Points AND ACTUATOR TESTING
1. Carry out inspection by means of the data list and
DIAGNOSIS USING DIAGNOSIS 2 MODE the actuator test function, if there is an
1. Switch the diagnosis mode of the engine control abnormality, check and repair the chassis harness
unit to DIAGNOSIS 2 mode using the MUT-II/III. and components.
2. Carry out a road test. 2. After repairing, re-check using the MUT-II/III and
3. Take a reading of the diagnosis code and repair check that the abnormal input and output have
the problem location. returned to normal as a result of the repairs.
4. Turn the ignition switch to "LOCK (OFF)" position 3. Erase the diagnosis code memory.
and then back to "ON" position again. 4. Remove the MUT-II/III, and then start the engine
NOTE: By turning the ignition switch to "LOCK again and carry out a road test to confirm that the
(OFF)" position, the ENGINE-ECU <M/T> or problem has disappeared.
ENGINE-A/T-ECU <A/T> will switch the
diagnosis mode from DIAGNOSIS 2 mode to
DIAGNOSIS 1 mode.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-11
FREEZE FRAME DATA The display items of freeze frame data are shown
When the engine-ECU <M/T> or engine-A/T-ECU below.
<A/T> detects a malfunction and stores a diagnosis
code, it also stores a current status of the engine.
This function is called "Freeze frame data". By
analyzing this "Freeze frame" data with the
MUT-II/III, an effective troubleshooting can be
performed.

DISPLAY ITEM LIST

Item No. Data Unit
21 Engine coolant temperature sensor °C
22 Engine speed r/min
24 Vehicle speed km/h
80 Long-term fuel compensation (long-term fuel trim) %
82 Short-term fuel compensation (short-term fuel trim) %
88 Fuel control condition Open loop OL
Closed loop CL
Open loop owing to drive condition OL-DRV.
Open loop owing to system malfunction OL-SYS.
Closed loop based on one oxygen sensor CL- HO2S
87 Calculation load value %
Diagnosis code during data recording -
NOTE: If malfunctions have been detected in
multiple systems, store one malfunction only, which
has been detected first.

DRIVE CYCLE
By carrying out the test drive in the following three drive cycle patterns, the all monitoring can be
accomplished for the diagnosis codes that is required by the vehicle driving to identify the fault. In other
words, doing such a drive allows to regenerate any kind of trouble which involves illuminating the engine
warning lamp (check engine lamp) and to verify the repair procedure has eliminated the trouble [the engine
warning lamp (check engine lamp) is no longer illuminated].
! CAUTION
Two technicians should always be in the vehicle when carrying out a test drive.
NOTE: Check that the diagnosis code is not output before traveling in the Drive cycle pattern. Erase the
diagnosis code if it has been output.
DRIVE CYCLE PATTERN LIST
Procedure Monitor item Diagnosis code
1 Catalytic converter monitor P0421
2 Oxygen sensor (front) monitor P0130
3 Other monitor P0136, P0201, P0202,
P0203, P0204, P0300,
P0301, P0302, P0303,
P0304, P0325, P0500
<M/T>, P0551
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-12 TROUBLESHOOTING

Procedure 1
Catalytic converter monitor
Diagnosis P0421
code No.
Drive cycle One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
pattern while traveling with the following drive cycle pattern. It will take 16 minutes or more.

6 minutes or more

90 km/h or more 10 minutes or more

(3)
(4) 55 - 80 km/h
Vehicle
speed (2) (5,6)

Stopping and braking

permitted
(1) (7)
Time

Engine Start Ignition switch :

"LOCK" (OFF)
position

AK301815 AB

Inspection • Atmospheric temperature: −10°C or more

condition • Condition of A/T:Selector lever D range, overdrive switch "ON" position
Test 1. Engine: start
procedure 2. Accelerate until the vehicle speed is 90 km/h or more.
3. Travel for 6 minutes or more while keeping the vehicle speed at 90 km/h or more.
4. Decelerate until the vehicle speed is within 80 km/h or less.
5. While traveling at 55 − 80 km/h for 10 minutes or more, fully close the throttle at least
once in 2 minutes and decelerate for 10 seconds or more.
• Do not repeat deceleration too often.
• Vehicle speed may go below 55 km/h after the deceleration.
• Stopping and braking are permitted. (If stopped or drive at 55 km/h or less for more
than 5 minutes the monitoring may be stopped. In this case please restart monitoring
from the beginning.)
6. After completing the above deceleration, bring the vehicle speed back to 55 − 80 km/h
and keep it in the range until starting the deceleration again.
• Repeat the above deceleration at least 5 times.
7. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-13
Procedure 2
Oxygen sensor (front) monitor
Diagnosis P0130
code No.
Drive cycle One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
pattern while traveling with the following drive cycle pattern. It will take 16 minutes or more.

16 minutes or more

55 - 80 km/h
(3)

Vehicle
speed (2) Stopping and braking
permitted

(1) (4)
Time

Engine Start Ignition switch :

"LOCK" (OFF)
position

AK301816AB

Inspection • Engine coolant temperature: After engine warm up

conditions • Atmospheric temperature: −10°C or more
• Condition of A/T:Selector lever D range, overdrive switch "ON" position
Test 1. Engine: start
procedure 2. Accelerate until the vehicle speed is 55 − 80 km/h.
3. While keeping the acceleator pedal opening degree constant, keep the vehicle speed at
55 − 80km/h and travel for 16 minutes or more.
• Stopping and braking during this operation are permitted.
4. Return the vehicle to the shop, then turn the ignition switch to "LOCK" (OFF) position.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-14 TROUBLESHOOTING

Procedure 3
Other monitor
Diagnosis P0136, P0201, P0202, P0203, P0204, P0300, P0301, P0302, P0303, P0304, P0325, P0500
code No. <M/T>, P0551
Drive cycle One trip monitor [from start to ignition switch to "LOCK" (OFF) position] will be completed
pattern while traveling with the following drive cycle pattern. It will take 21 minutes or more.

16 minutes or more

55 km/h or more
(3)

Vehicle (2) 5 minutes or more

speed Engine: Idling
Transmission: Neutral

(1) (4) (5)

Time

Engine Start Ignition switch :

"LOCK" (OFF)
position

AK301817AB

Inspection • Engine coolant temperature: After engine warm up

conditions • Atmospheric temperature: −10°C or more
• Condition of A/T:Selector lever D range, overdrive switch "ON" position
Test 1. Engine: start
procedure 2. Accelerate until the vehicle speed is 55 km/h.
3. While keeping the acceleator pedal opening degree constant, keep the vehicle speed at
55 km/h and travel for 16 minutes or more.
4. Return the vehicle to the shop.
5. After stopping the vehicle, continue idling for 5 minutes, and then turn the ignition switch
to "LOCK" (OFF) position.

READINESS TEST STATUS In addition, if diagnosis codes are erased or the

The engine-ECU <M/T> or engine-A/T-ECU <A/T> battery cable is disconnected, this history will also be
monitors the following main diagnosis items, judges erased (the memory will be reset).
if these items are in good condition or not, and the • Catalyst: P0421
stores its history. this history can be read out by • Oxygen sensor: P0130
using MUT-II/III. (If the ECU has judged a item • Oxygen sensor heater: P0135, P0141
before, the MUT-II/III displays "Complete").
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-15
FAIL-SAFE FUNCTION REFERENCE TABLE
When the main sensor malfunctions are detected by the diagnosis function, the vehicle is controlled by
means of the pre-set control logic to maintain safe conditions for driving.

Malfunctioning item Control contents during malfunction

Manifold absolute 1. Uses the throttle position sensor signal and engine speed signal (crank angle
pressure sensor sensor signal) to take reading of the basic injector drive time and basic ignition
timing from the pre-set mapping.
2. Fixes the idle speed control servo in the appointed position so idle control is not
performed.
Intake air temperature Controls as if the intake air temperature is 25°C.
sensor
Throttle position sensor No increase in fuel injection amount during acceleration due to the throttle position
sensor signal.
Engine coolant Controls as if the engine coolant temperature is 80°C.
temperature sensor
Camshaft position Injectors fuel into the cylinders in the order 1-3-4-2 with irregular timing. (After the
sensor ignition switch is turned to the "ON" position, the No. 1 cylinder top dead center is
not detected at all)
Oxygen sensor (front) Air-fuel ratio feedback control (closed loop control) is not performed.
Oxygen sensor (rear) Performs the feedback control (closed loop control) of the air-fuel ratio by using
only the signal of the oxygen (front) installed on the front of the catalytic converter.
Detonation sensor Fixes the ignition timing as that for regular gasoline.
Ignition coil Cuts off the fuel supply to cylinders with an abnormal ignition.
(incorporating power
transistor)
Alternator FR terminal Does not control the output of the alternator according to an electrical load. (works
as a normal alternator)
Misfiring If the detected misfiring causes damage to the catalyst, the misfiring cylinder will be
shut down.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-16 TROUBLESHOOTING

INSPECTION CHART FOR DIAGNOSIS CODE

M1131151000691

Code No. Diagnosis item Reference page

P0105 Manifold absolute pressure sensor system P.13B-28
P0110 Intake air temperature sensor system P.13A-30
P0115 Engine coolant temperature sensor system P.13A-41
P0120 Throttle position sensor system P.13A-52
P0125* Feedback system monitor P.13A-64
P0130 Oxygen sensor (front) system <sensor 1> P.13A-70
P0135 Oxygen sensor heater (front) system <sensor 1> P.13A-79
P0136 Oxygen sensor (rear) system <sensor 2> P.13A-86
P0141 Oxygen sensor heater (rear) system <sensor 2> P.13A-95
P0170 Abnormal fuel system P.13A-103
P0201 No.1 Injector system P.13A-108
P0202 No.2 Injector system P.13A-113
P0203 No.3 Injector system P.13A-118
P0204 No.4 Injector system P.13A-123
P0300 Random cylinder misfire detection system P.13A-128
P0301* No.1 cylinder misfire detection system P.13A-132
P0302* No.2 cylinder misfire detection system P.13A-136
P0303* No.3 cylinder misfire detection system P.13A-139
P0304* No.4 cylinder misfire detection system P.13A-142
P0325 Detonation sensor system P.13A-145
P0335 Crank angle sensor system P.13A-149
P0340 Camshaft position sensor system P.13A-162
P0403 EGR control solenoid valve system P.13A-174
P0421 Warm up catalyst malfunction P.13A-181
P0443 Purge control solenoid valve system P.13A-181
P0500 Vehicle speed sensor system <M/T> P.13A-189
P0505 Idle speed control system P.13A-192
P0513 Immobilizer system P.13A-198
P0551* Power steering fluid pressure switch system P.13A-202
P0622 Alternator FR terminal system P.13A-210
P1603* Battery back-up line system P.13A-216
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-17
NOTE: .
• Do not replace the engine-ECU <M/T> or engine-A/T-ECU <A/T> until a through terminal check reveals
there are no short/open circuit.
• Check that the engine-ECU <M/T> or engine-A/T-ECU <A/T> earth circuit is normal before checking for
the cause of the problem.
• After the engine-ECU <M/T> or engine-A/T-ECU <A/T> has detected a malfunction, a diagnosis code is
recorded the next time the engine is started and the same malfunction is re-detected. However, for items
marked with "*", the diagnosis code is recorded on the first detection of the malfunction.
• Sensor 1 indicates the sensor mounted at a position closest to the engine, and sensor 2 indicates the
sensor mounted at the position second closest to the engine.

INSPECTION PROCEDURE FOR

DIAGNOSIS CODES

Code No. P0105: Manifold absolute Pressure Sensor System

Manifold absolute pressure sensor circuit

B-102

Power Manifold absolute pressure sensor

1 2 3 4 source Gnd Output

2 3 4

G-L B Y-L

81 (*1) or 92 (*1) or 85 (*1) or

46 (*2) 57 (*2) 55 (*2)
C-124 (*2) C-129 (*1)
(MU803781) (MU801823)
41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57 71 72 73 74 75 76 77 78 79 80 81
58 59 60 61 62 63 64 65 66 82 83 84 85 86 87 88 89 90 9192
5V
Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>
NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301109 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-18 TROUBLESHOOTING

OPERATION DIAGNOSIS PROCEDURE

• A power voltage of 5 V is applied to the manifold
absolute pressure sensor power terminal
(terminal No. 2) from the engine-ECU (terminal STEP 1. MUT-II/III data list
No. 81) <M/T> or engine-A/T-ECU (terminal No. • Refer to data list reference table P.13A-361.
46) <A/T> and earthed to the engine-ECU a. Item 32: Manifold absolute pressure sensor
(terminal No. 85) <M/T> or engine-A/T-ECU Q: Is the check result normal?
(terminal No. 55) <A/T> from the manifold YES : Intermittent malfunction (Refer to GROUP
absolute pressure sensor (terminal No. 4). 00 − How to Use Troubleshooting/Inspection
• The sensor signal is inputted to the engine-ECU Service Points P.00-6).
(terminal No. 92) <M/T> or engine-A/T-ECU NO : Go to Step 2 .
(terminal No. 57) <A/T> from the manifold
absolute pressure sensor output terminal STEP 2. Connector check: B-102 Manifold
(terminal No. 3). absolute pressure sensor connector
FUNCTION Connector: B-102
• The manifold absolute pressure sensor converts 4 3 2 1
the manifold absolute pressure into a voltage Harness side
connector
signal and inputs the signal to the B-102 (GR)
engine-ECU<M/T> or engine-A/T-ECU <A/T>.
• In response to the signal, the engine-ECU<M/T>
or engine-A/T-ECU <A/T> corrects the fuel
injection amount, etc.

TROUBLE JUDGMENT AK301110 AB

Check Condition
Q: Is the check result normal?
• Ignition switch: ON YES : Go to Step 3 .
Judgment Criteria NO : Repair or replace.
• The output voltage is 4.5 V or more (Manifold
absolute pressure of above 115 kPa or STEP 3. Perform voltage measurement at B-102
equivalent) for 2 seconds. Manifold absolute pressure sensor connector.
Check Conditions Connector: B-102
• The output voltage of the throttle position sensor 4 3 2 1
is 1.25 V or more. Harness side
• The vehicle is stationary. connector
B-102 (GR)
Judgment Criteria
• The sensor output voltage is 0.2 V or less
(Manifold absolute pressure of below 4.9 kPa
equivalent) for 2 seconds.

PROBABLE CAUSE AK301110 AB

• Failed Manifold absolute pressure sensor • Disconnect connector, and measure at harness
• Open/short circuit in Manifold absolute pressure side.
sensor circuit or loose connector contact • Ignition switch: ON
• Failed engine-ECU <M/T> • Voltage between terminal No. 2 and earth.
• Failed engine-A/T-ECU <A/T>
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 9 .
NO : Go to Step 4 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-19
Q: Is the check result normal?
STEP 4. Perform voltage measurement at C-129
YES : Go to Step 5 .
engine-ECU <M/T> connector or C-124 NO : Go to Step 6 .
engine-A/T-ECU <A/T> connector.
Connector: C-129
STEP 5. Connector check: C-129 engine-ECU
<L. H. drive vehicles>
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>
C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 C-129 (Y)
Harness side connector
AK301111AB

Connector: C-124 8180 79 78 77 76 75 74 73 72 71

<L. H. drive vehicles> 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>
C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector C-124 (GR)

AK301112 AB
46 45 44 43 42 41
• Measure engine-ECU <M/T> or engine-A/T-ECU 57 56 55 54 53 52 51 50 49 48 47
<A/T> terminal voltage. 66 65 64 63 62 61 60 59 58

• Ignition switch: ON Harness side connector

AK301112 AB
• Voltage between terminal No. 81 <M/T> or
terminal No. 46 <A/T> and earth.
OK: 4.9 − 5.1 V
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-20 TROUBLESHOOTING

Connector: B-102 STEP 6. Connector check: C-129 engine-ECU

4 3 2 1 <M/T> connector or C-124 engine-A/T-ECU <A/T>
Harness side connector
connector
B-102 (GR) Connector: C-129
<L. H. drive vehicles>

AK301110 AB C-129 (Y)

Q: Is the check result normal?

YES : Check and repair harness between B-102 <R. H. drive vehicles>
(terminal No. 2) manifold absolute pressure
sensor connector and C-129 (terminal No.
81) engine-ECU <M/T> connector or C-124
(terminal No. 46) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check power supply line for open
circuit.
NO : Repair or replace.
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-21
STEP 7. Check harness between B-102 (terminal Connector: C-124
No. 2) manifold absolute pressure sensor <L. H. drive vehicles>
connector and C-129 (terminal No. 81)
engine-ECU <M/T> connector or C-124 (terminal
No. 46) engine-A/T-ECU <A/T> connector.
Connector: B-102
4 3 2 1 C-124 (GR)

Harness side
connector
<R. H. drive vehicles>
B-102 (GR)

AK301110 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check power supply line for short circuit.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 8 .
NO : Repair.
<R. H. drive vehicles>

STEP 8. MUT-II/III data list

• Refer to data list reference table P.13A-361.
a. Item No. 32: Manifold absolute pressure
sensor
C-129 (Y) Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
8180 79 78 77 76 75 74 73 72 71 Service Points P.00-6).
92 91 90 89 88 87 86 85 84 83 82
NO : Replace engine-ECU <M/T> or
Harness side connector
AK301111AB engine-A/T-ECU <A/T>.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-22 TROUBLESHOOTING

STEP 9. Perform voltage measurement at B-102 STEP 10. Connector check: C-129 engine-ECU
manifold absolute pressure sensor connector. <M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: B-102
4 3 2 1 Connector: C-129
Harness side <L. H. drive vehicles>
connector
B-102 (GR)

C-129 (Y)

AK301110 AB <R. H. drive vehicles>

• Disconnect connector, and measure at harness
side.
• Voltage between terminal No. 3 and earth.
OK: 2 Ω or less
Q: Is the check result normal? C-129 (Y)
YES : Go to Step 12 .
NO : Go to Step 10 .
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 11 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-23
STEP 11. Check harness between B-102 (terminal Connector: C-124
No. 3) manifold absolute pressure sensor <L. H. drive vehicles>
connector and C-129 (terminal No. 92)
engine-ECU <M/T> connector or C-124 (terminal
No. 57) engine-A/T-ECU <A/T> connector.
Connector: B-102
4 3 2 1 C-124 (GR)

Harness side
connector
<R. H. drive vehicles>
B-102 (GR)

AK301110 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check earthing line for open circuit or damage.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 8 .
NO : Repair.
<R. H. drive vehicles>

STEP 12. Perform voltage measurement at B-102

manifold absolute pressure sensor connector.
Connector: B-102
4 3 2 1
C-129 (Y) Harness side
connector
B-102 (GR)
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

AK301110 AB

• Use special tool test harness (MB991348) to

connect only terminal No. 2 and then measure at
pick-up harness.
• Ignition switch: ON
• Voltage between terminal No. 2 and earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 14 .
NO : Go to Step 13 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-24 TROUBLESHOOTING

STEP 13. Connector check: C-129 engine-ECU Connector: B-102

<M/T> connector or C-124 engine-A/T-ECU <A/T> 4 3 2 1
connector Harness side
connector
Connector: C-129 B-102 (GR)
<L. H. drive vehicles>

C-129 (Y) AK301110 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-102
(terminal No. 2) manifold absolute pressure
sensor connector and C-129 (terminal No.
81) engine-ECU <M/T> connector or C-124
(terminal No. 46) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check power supply line for damage.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 STEP 14. Perform voltage measurement at B-102
Harness side connector
AK301111AB
manifold absolute pressure sensor connector.
Connector: B-102
Connector: C-124 4 3 2 1
<L. H. drive vehicles> Harness side
connector
B-102 (GR)

C-124 (GR)

<R. H. drive vehicles> AK301110 AB

• Use special tool test harness (MB991348) to

connect only terminal No. 3 and then measure at
pick-up harness.
• Ignition switch: ON
• Voltage between terminal No. 3 and earth.
C-124 (GR) OK: 0.5 V or less
46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
Q: Is the check result normal?
66 65 64 63 62 61 60 59 58 YES : Go to Step 16 .
Harness side connector NO : Go to Step 15 .
AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-25
STEP 15. Connector check: C-129 engine-ECU Connector: B-102
<M/T> connector or C-124 engine-A/T-ECU <A/T> 4 3 2 1
connector Harness side
connector
Connector: C-129 B-102 (GR)
<L. H. drive vehicles>

C-129 (Y) AK301110 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-102
(terminal No. 3) manifold absolute pressure
sensor connector and C-129 (terminal No.
92) engine-ECU <M/T> connector or C-124
(terminal No. 57) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check earthing line for damage.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 STEP 16. Perform voltage measurement at B-102
Harness side connector
AK301111AB
manifold absolute pressure sensor connector.
Connector: B-102
Connector: C-124 4 3 2 1
<L. H. drive vehicles> Harness side
connector
B-102 (GR)

C-124 (GR)

<R. H. drive vehicles> AK301110 AB

• Use special tool test harness (MB991348) to

connect only terminal No. 4 and then measure at
pick-up harness.
• Ignition switch: ON
• Voltage between terminal No. 4 and earth.
C-124 (GR) OK:
46 45 44 43 42 41 Altitude 0m: 3.8 − 4.2 V
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58
Altitude 600m: 3.5 − 3.9 V
Altitude 1,200m: 3.3 − 3.7 V
Harness side connector
AK301112 AB Altitude 1,800m: 3.0 − 3.4 V
Q: Is the check result normal?
YES : Go to Step 19 .
NO : Go to Step 17 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-26 TROUBLESHOOTING

Q: Is the check result normal?

STEP 17. Connector check: C-129 engine-ECU
YES : Go to Step 18 .
<M/T> connector or C-124 engine-A/T-ECU <A/T> NO : Repair or replace.
connector
Connector: C-129
STEP 18. Check harness between B-102 (terminal
<L. H. drive vehicles>
No. 4) manifold absolute pressure sensor
connector and C-129 (terminal No. 85)
engine-ECU <M/T> connector or C-124 (terminal
No. 55) engine-A/T-ECU <A/T> connector.
C-129 (Y)
Connector: B-102
4 3 2 1
Harness side
<R. H. drive vehicles> connector
B-102 (GR)

C-129 (Y)
AK301110 AB

Connector: C-129
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
<L. H. drive vehicles>
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles> C-129 (Y)

<R. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
C-124 (GR) Harness side connector
AK301111AB

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-27

Connector: C-124 Connector: C-124

<L. H. drive vehicles> <L. H. drive vehicles>

C-124 (GR) C-124 (GR)

<R. H. drive vehicles> <R. H. drive vehicles>

C-124 (GR) C-124 (GR)

46 45 44 43 42 41 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47 57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58 66 65 64 63 62 61 60 59 58

Harness side connector Harness side connector

AK301112 AB AK301112 AB

• Check output line for short circuit and damage. • Measure engine-ECU <M/T> or engine-A/T-ECU
Q: Is the check result normal?
<A/T> terminal voltage.
YES : Replace manifold absolute pressure sensor. • Ignition switch: ON
NO : Repair. • Voltage between terminal No. 85 <M/T> or
terminal No. 55 <A/T> and earth.
OK:
STEP 19. Perform voltage measurement at C-129
Altitude 0m: 3.8 − 4.2 V
engine-ECU <M/T> connector or C-124
Altitude 600m: 3.5 − 3.9 V
engine-A/T-ECU <A/T> connector.
Altitude 1,200m: 3.3 − 3.7 V
Connector: C-129 Altitude 1,800m: 3.0 − 3.4 V
<L. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 21 .
NO : Go to Step 20 .

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-28 TROUBLESHOOTING

STEP 20. Connector check: C-129 engine-ECU Connector: B-102

<M/T> connector or C-124 engine-A/T-ECU <A/T> 4 3 2 1
connector Harness side
connector
Connector: C-129 B-102 (GR)
<L. H. drive vehicles>

C-129 (Y) AK301110 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-102
(terminal No. 4) manifold absolute pressure
sensor connector and C-129 (terminal No.
85) engine-ECU <M/T> connector or C-124
(terminal No. 55) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check output line for open circuit and
damage.
NO : Repair or replace.
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-29
Q: Is the check result normal?
STEP 21. Connector check: C-129 engine-ECU
YES : Go to Step 8 .
<M/T> connector or C-124 engine-A/T-ECU <A/T> NO : Repair or replace.
connector
Connector: C-129
<L. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-30 TROUBLESHOOTING

Code No. P0110: Intake Air Temperature Sensor System

Intake air temperature sensor circuit

B-102
Intake air temperature sensor
1 2 3 4 (Incorporated in manifold
absolute pressure sensor)

3 1

B R-L

92 (*1) or 72 (*1) or
57 (*2) 64 (*2)
C-124 (*2) C-129 (*1)
(MU803781) (MU801823)
41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57 71 72 73 74 75 76 77 78 79 80 81
58 59 60 61 62 63 64 65 66 82 83 84 85 86 87 88 89 90 9192
5V

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>
NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301113 AB

OPERATION FUNCTION
• A power voltage of 5 V is applied to the intake air • The intake air temperature sensor converts the
temperature sensor output terminal (terminal No. intake air temperature into a voltage and inputs
1) of the Manifold absolute pressure sensor the voltage signal to the engine-ECU <M/T> or
connector from the engine-ECU (terminal No. 72) engine-A/T-ECU <A/T>.
<M/T> or engine-A/T-ECU (terminal No. 64) • In response to the signal, the engine-ECU <M/T>
<A/T>. or engine-A/T-ECU <A/T> corrects the fuel
• The power voltage is earthed to the engine-ECU injection amount, etc.
(terminal No. 92) <M/T> or engine-A/T-ECU • The intake air temperature sensor is a kind of
(terminal No. 57) <A/T> from the Manifold resistor, which has characteristics to reduce its
absolute pressure sensor (terminal No. 3). resistance as the intake air temperature rises.
Therefore, the sensor output voltage varies with
the intake air temperature, and becomes lower as
the intake air temperature rises.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-31
TROUBLE JUDGMENT STEP 2. Connector check: B-102 manifold
Check Condition absolute pressure sensor connector
• 2 seconds later after the ignition switch has been
Connector: B-102
in "ON" position or the engine has started up. 4 3 2 1
Judgment Criteria Harness side
connector
• The sensor output voltage is 4.6 V or more B-102 (GR)
(intake air temperature of below −45°C or
equivalent) for 2 seconds.
or
• The sensor output voltage is 0.2 V or less (intake
air temperature of above 125°C or equivalent) for
2 seconds. AK301110 AB

PROBABLE CAUSE Q: Is the check result normal?

• Failed intake air temperature sensor YES : Go to Step 3 .
• Open/short circuit in intake air temperature NO : Repair or replace.
sensor circuit or loose connector contact
• Failed engine-ECU <M/T> STEP 3. Check intake air temperature sensor
• Failed engine-A/T-ECU <A/T> itself.
• Check intake air temperature sensor itself (Refer
DIAGNOSIS PROCEDURE to P.13A-389).
Q: Is the check result normal?
STEP 1. MUT-II/III data list YES : Go to Step 4 .
• Refer to data list reference table P.13A-361. NO : Replace manifold absolute pressure sensor.
a. Item 13: Intake air temperature sensor
OK: At ambient temperature (atmospheric STEP 4. Perform voltage measurement at B-102
temperature) or equivalent. manifold absolute pressure sensor connector.
Q: Is the check result normal? Connector: B-102
YES : Intermittent malfunction (Refer to GROUP 4 3 2 1
00 − How to Use Troubleshooting/Inspection Harness side
Service Points P.00-6). connector
B-102 (GR)
NO : Go to Step 2 .

AK301110 AB

• Disconnect connector, and measure at harness

side.
• Voltage between terminal No. 3 and earth.
OK: 2 Ω or less
Q: Is the check result normal?
YES : Go to Step 8 .
NO : Go to Step 5 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-32 TROUBLESHOOTING

Q: Is the check result normal?

STEP 5. Connector check: C-129 engine-ECU
YES : Go to Step 6 .
<M/T> connector or C-124 engine-A/T-ECU <A/T> NO : Repair or replace.
connector
Connector: C-129
<L. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-33
STEP 6. Check harness between B-102 (terminal Connector: C-124
No. 3) manifold absolute pressure sensor <L. H. drive vehicles>
connector and C-129 (terminal No. 92)
engine-ECU <M/T> connector or C-124 (terminal
No. 57) engine-A/T-ECU <A/T> connector.
Connector: B-102
4 3 2 1 C-124 (GR)

Harness side
connector
<R. H. drive vehicles>
B-102 (GR)

AK301110 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check earthing line for open circuit and damage.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 7 .
NO : Repair.
<R. H. drive vehicles>

STEP 7. MUT-II/III data list

• Refer to data list reference table P.13A-361.
a. Item 13: Intake air temperature sensor
OK: At ambient temperature or equivalent.
C-129 (Y)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Service Points P.00-6).
Harness side connector NO : Replace engine-ECU <M/T> or
AK301111AB
engine-A/T-ECU <A/T>.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-34 TROUBLESHOOTING

STEP 8. Perform voltage measurement at B-102 STEP 9. Perform voltage measurement at C-129
manifold absolute pressure sensor connector. engine-ECU <M/T> connector or C-124
engine-A/T-ECU <A/T> connector.
Connector: B-102
4 3 2 1 Connector: C-129
Harness side <L. H. drive vehicles>
connector
B-102 (GR)

C-129 (Y)

AK301110 AB <R. H. drive vehicles>

• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: 4.5 − 4.9 V C-129 (Y)
Q: Is the check result normal?
YES : Go to Step 13 .
NO : Go to Step 9 . 8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-35

Connector: B-102 STEP 10. Connector check: C-129 engine-ECU

4 3 2 1 <M/T> connector or C-124 engine-A/T-ECU <A/T>
Harness side connector
connector
B-102 (GR) Connector: C-129
<L. H. drive vehicles>

AK301110 AB C-129 (Y)

Connector: B-102
4 3 2 1 <R. H. drive vehicles>
Harness side
connector
B-102 (GR)

C-129 (Y)

AK301110 AB
8180 79 78 77 76 75 74 73 72 71
• Measure engine-ECU <M/T> or engine-A/T-ECU 92 91 90 89 88 87 86 85 84 83 82
<A/T> terminal voltage. Harness side connector
AK301111AB
• Disconnect B-102 manifold absolute pressure
sensor connector. Connector: C-124
• Ignition switch: ON <L. H. drive vehicles>
• Voltage between terminal No. 72 <M/T> or
terminal No. 64 <A/T> and earth.
OK: 4.5 − 4.9 V
Q: Is the check result normal? C-124 (GR)
YES : Go to Step 10 .
NO : Go to Step 11 .
<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-36 TROUBLESHOOTING

Connector: B-102 STEP 11. Connector check: C-129 engine-ECU

4 3 2 1 <M/T> connector or C-124 engine-A/T-ECU <A/T>
Harness side connector
connector
B-102 (GR) Connector: C-129
<L. H. drive vehicles>

AK301110 AB C-129 (Y)

Q: Is the check result normal?

YES : Check and repair harness between B-102 <R. H. drive vehicles>
(terminal No. 1) manifold absolute pressure
sensor connector and C-129 (terminal No.
72) engine-ECU <M/T> connector or C-124
(terminal No. 64) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check output line for open circuit.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 12 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-37
STEP 12. Check harness between B-102 (terminal Connector: C-124
No. 1) manifold absolute pressure sensor <L. H. drive vehicles>
connector and C-129 (terminal No. 72)
engine-ECU <M/T> connector or C-124 (terminal
No. 64) engine-A/T-ECU <A/T> connector.
Connector: B-102
4 3 2 1 C-124 (GR)

Harness side
connector
<R. H. drive vehicles>
B-102 (GR)

AK301110 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for short circuit.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 7 .
NO : Repair.
<R. H. drive vehicles>

STEP 13. Perform voltage measurement at B-102

manifold absolute pressure sensor connector.
Connector: B-102
4 3 2 1
C-129 (Y) Harness side
connector
B-102 (GR)
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

AK301110 AB

• Use special tool test harness (MB991348) to

connect only terminal No. 1 and No. 3, and then
measure at pick-up harness.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK:
Ambient temperature at −20°C: 3.8 − 4.4 V
Ambient temperature at 0°C: 3.2 − 3.8 V
Ambient temperature at 20°C: 2.3 − 2.9 V
Ambient temperature at 40°C: 1.5 − 2.1 V
Ambient temperature at 60°C: 0.8 − 1.4 V
Ambient temperature at 80°C: 0.4 − 1.0 V
Q: Is the check result normal?
YES : Go to Step 7 .
NO : Go to Step 14 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-38 TROUBLESHOOTING

STEP 14. Connector check: C-129 engine-ECU STEP 15. Check harness between B-102 (terminal
<M/T> connector or C-124 engine-A/T-ECU <A/T> No. 1) manifold absolute pressure sensor
connector connector and C-129 (terminal No. 72)
Connector: C-129
engine-ECU <M/T> connector or C-124 (terminal
<L. H. drive vehicles> No. 64) engine-A/T-ECU <A/T> connector.
Connector: B-102
4 3 2 1
Harness side
connector
C-129 (Y) B-102 (GR)

<R. H. drive vehicles>

AK301110 AB

Connector: C-129
C-129 (Y) <L. H. drive vehicles>

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
C-129 (Y)
Harness side connector
AK301111AB

Connector: C-124 <R. H. drive vehicles>

<L. H. drive vehicles>

C-124 (GR) C-129 (Y)

<R. H. drive vehicles>

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 15 .
NO : . Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-39

Connector: C-124 STEP 16. Connector check: C-129 engine-ECU

<L. H. drive vehicles> <M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58 C-129 (Y)
Harness side connector
AK301112 AB

• Check output line for damage. 8180 79 78 77 76 75 74 73 72 71

92 91 90 89 88 87 86 85 84 83 82
Q: Is the check result normal? Harness side connector
YES : Go to Step 16 . AK301111AB

NO : Repair.
Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-40 TROUBLESHOOTING

YES : Check and repair harness between B-102

Connector: B-102
4 3 2 1 (terminal No. 3) manifold absolute pressure
Harness side
sensor connector and C-129 (terminal No.
connector 92) engine-ECU <M/T> connector or C-124
B-102 (GR) (terminal No. 57)
engine-A/T-ECU <A/T> connector.
• Check earthing line for damage.
NO : Repair or replace.

AK301110 AB

Q: Is the check result normal?

 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-41

Code No. P0115: Engine Coolant Temperature Sensor System

Engine coolant temperature sensor circuit

B-111
(MU802406)

1 2 Engine coolant temperature sensor

2 1

B Y-W

92 (*1) or 83 (*1) or
57 (*2) 44 (*2)
C-124 (*2) C-129 (*1)
(MU803781) (MU801823)
41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57 71 72 73 74 75 76 77 78 79 80 81
58 59 60 61 62 63 64 65 66 82 83 84 85 86 87 88 89 90 9192
5V

Engine-ECU <M/T>
NOTE or
*1: M/T Engine-A/T-ECU <A/T>
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301114 AB

OPERATION • In response to the signal, the engine-ECU <M/T>

• A power voltage of 5 V is applied to the engine or engine-A/T-ECU <A/T> controls the fuel
coolant temperature sensor output terminal injection amount and the fast idle speed when the
(terminal No. 1) from the engine-ECU (terminal engine is cold state.
No. 83) <M/T> or engine-A/T-ECU (terminal No. • The engine coolant temperature sensor is a kind
44) <A/T>. of resistor, which has characteristics to reduce its
• The power voltage is earthed to the engine-ECU resistance as the engine coolant temperature
(terminal No. 92) <M/T> or engine-A/T-ECU rises. Therefore, the sensor output voltage varies
(terminal No. 57) <A/T> from the engine coolant with the engine coolant temperature, and
temperature sensor (terminal No. 2). becomes lower as the engine coolant
temperature rises.
FUNCTION
• The engine coolant temperature sensor converts
the engine coolant temperature into a voltage
signal, and inputs the voltage to the engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-42 TROUBLESHOOTING

TROUBLE JUDGMENT STEP 2. Connector check: B-111 engine coolant

Check Condition temperature sensor connector
• 2 seconds later after the ignition switch has been
Connector: B-111
in "ON" position or just after the engine has
started up.
Judgment Criteria B-111 (B)
• The sensor output voltage is 4.6 V or more
(engine coolant temperature of below −45°C or
equivalent) for 2 seconds.
or
2 1
• The sensor output voltage is 0.1 V or less (engine
coolant temperature of above 140°C or Harness side connector AK301115 AB

equivalent) for 2 seconds.

Q: Is the check result normal?
Check Condition YES : Go to Step 3 .
• After the engine has started up. NO : Repair or replace.
Judging Conditions
• The sensor output voltage rises 1.6 V or more STEP 3. Perform resistance measurement at
(engine coolant temperature below 40°C or B-111 engine coolant temperature sensor
equivalent) from 1.6 V or less (engine coolant connector.
temperature above 40°C or equivalent).
Connector: B-111
PROBABLE CAUSE
• Failed engine coolant temperature sensor
• Open/short circuit in engine coolant temperature B-111 (B)
sensor circuit or loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
2 1
DIAGNOSIS PROCEDURE Harness side connector AK301115 AB

• Disconnect connector, and measure at sensor

STEP 1. MUT-II/III data list side.
• Refer to data list reference table P.13A-361. • Resistance between terminal No. 1 and No. 2.
a. Item 21: Engine coolant temperature sensor
OK:
OK: Engine coolant temperature at −20°C: 14 − 17
Engine cold state: At ambient temperature or kΩ
equivalent. Engine coolant temperature at 0°C: 5.1 − 6.5
Engine hot state: At 80 − 120°C kΩ
Q: Is the check result normal? Engine coolant temperature at 20°C: 2.1 − 2.7
YES : Intermittent malfunction (Refer to GROUP kΩ
00 − How to Use Troubleshooting/Inspection Engine coolant temperature at 40°C: 0.9 − 1.3
Service Points P.00-6). kΩ
NO : Go to Step 2 . Engine coolant temperature at 60°C: 0.48 −
0.68 kΩ
Engine coolant temperature at 80°C: 0.26 −
0.36 kΩ
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace engine coolant temperature
sensor.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-43
STEP 4. Perform voltage measurement at B-111 STEP 5. Perform voltage measurement at C-129
engine coolant temperature sensor connector. engine-ECU <M/T> connector or C-124
engine-A/T-ECU <A/T> connector.
Connector: B-111
Connector: C-129
<L. H. drive vehicles>

B-111 (B)

C-129 (Y)
2 1
Harness side connector AK301115 AB <R. H. drive vehicles>
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: 4.5 − 4.9 V C-129 (Y)
Q: Is the check result normal?
YES : Go to Step 10 .
NO : Go to Step 5 . 8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-44 TROUBLESHOOTING

Connector: B-111 STEP 6. Connector check: C-129 engine-ECU

<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
B-111 (B) Connector: C-129
<L. H. drive vehicles>

2 1
Harness side connector AK301115 AB C-129 (Y)

• Measure engine-ECU <M/T> or engine-A/T-ECU

<A/T> terminal voltage. <R. H. drive vehicles>
• Disconnect B-111 engine coolant temperature
sensor.
• Ignition switch: ON
• Voltage between terminal No. 83 <M/T> or
terminal No. 44 <A/T> and earth.
OK: 4.5 − 4.9 V C-129 (Y)

Q: Is the check result normal?

YES : Go to Step 6 .
8180 79 78 77 76 75 74 73 72 71
NO : Go to Step 7 . 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-45

Connector: B-111 STEP 7. Connector check: C-129 engine-ECU

<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
B-111 (B) Connector: C-129
<L. H. drive vehicles>

2 1
Harness side connector AK301115 AB C-129 (Y)

Q: Is the check result normal?

YES : Check and repair harness between B-111 <R. H. drive vehicles>
(terminal No. 1) engine coolant temperature
sensor connector and C-129 (terminal No.
83) engine-ECU <M/T> connector or C-124
(terminal No. 44) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check output line for open circuit.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 8 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-46 TROUBLESHOOTING

STEP 8. Check harness between B-111 (terminal Connector: C-124

No. 1) engine coolant temperature sensor <L. H. drive vehicles>
connector and C-129 (terminal No. 83)
engine-ECU <M/T> connector or C-124 (terminal
No. 44) engine-A/T-ECU <A/T> connector.
Connector: B-111
C-124 (GR)

B-111 (B) <R. H. drive vehicles>

2 1
Harness side connector AK301115 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for short circuit.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 9 .
NO : Repair.
<R. H. drive vehicles>

STEP 9. MUT-II/III data list

• Refer to data list reference table P.13A-361.
a. Item 21: Engine coolant temperature sensor
OK:
C-129 (Y) Engine cold state: At ambient temperature or
equivalent.
Engine hot state: At 80 − 120 °C
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 Q: Is the check result normal?
Harness side connector YES : Intermittent malfunction (Refer to GROUP
AK301111AB
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-47
STEP 10. Perform voltage measurement at B-111 STEP 11. Connector check: C-129 engine-ECU
engine coolant temperature sensor connector. <M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: B-111
Q: Is the check result normal?
Connector: C-129
B-111 (B) <L. H. drive vehicles>

2 1 C-129 (Y)
Harness side connector AK301115 AB

• Disconnect connector and measure at harness <R. H. drive vehicles>

side.
• Voltage between terminal No. 2 and earth.
OK: 2 Ω or less
Q: Is the check result normal?
YES : Go to Step 13 .
C-129 (Y)
NO : Go to Step 11 .

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

YES : Go to Step 12 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-48 TROUBLESHOOTING

STEP 12. Check harness between B-111 (terminal Connector: C-124

No. 2) engine coolant temperature sensor <L. H. drive vehicles>
connector and C-129 (terminal No. 92)
engine-ECU <M/T> connector or C-124 (terminal
No. 57) engine-A/T-ECU <A/T> connector.
Connector: B-111
C-124 (GR)

B-111 (B) <R. H. drive vehicles>

2 1
Harness side connector AK301115 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check earthing line for open circuit and damage.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 9 .
NO : Repair.
<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-49
STEP 13. Perform voltage measurement at B-111 STEP 14. Connector check: C-129 engine-ECU
engine coolant temperature sensor connector. <M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: B-111
Connector: C-129
<L. H. drive vehicles>

B-111 (B)

C-129 (Y)
2 1
Harness side connector AK301115 AB <R. H. drive vehicles>
• Use special tool test harness (MB991658) to
connect connector, and measure at pick-up
harness.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
C-129 (Y)
OK:
Engine coolant temperature at −20°C: 3.9 − 4.5
V 8180 79 78 77 76 75 74 73 72 71
Engine coolant temperature at 0°C: 3.2 − 3.8 V 92 91 90 89 88 87 86 85 84 83 82
Engine coolant temperature at 20°C: 2.3 − 2.9 Harness side connector
AK301111AB
V
Engine coolant temperature at 40°C: 1.3 − 1.9 Connector: C-124
V <L. H. drive vehicles>
Engine coolant temperature at 60°C: 0.7 − 1.3
V
Engine coolant temperature at 80°C: 0.3 − 0.9
V
C-124 (GR)
Q: Is the check result normal?
YES : Go to Step 9 .
NO : Go to Step 14 . <R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 15 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-50 TROUBLESHOOTING

STEP 15. Check harness between B-111 (terminal Connector: C-124

No. 1) engine coolant temperature sensor <L. H. drive vehicles>
connector and C-129 (terminal No. 83)
engine-ECU <M/T> connector or C-124 (terminal
No. 44) engine-A/T-ECU <A/T> connector.
Connector: B-111
C-124 (GR)

B-111 (B) <R. H. drive vehicles>

2 1
Harness side connector AK301115 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for damage.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 16 .
NO : Repair.
<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-51
STEP 16. Connector check: C-129 engine-ECU Connector: B-111
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129 B-111 (B)
<L. H. drive vehicles>

2 1
C-129 (Y) Harness side connector AK301115 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-111
(terminal No. 2) engine coolant temperature
sensor connector and C-129 (terminal No.
92) engine-ECU <M/T> connector or C-124
(terminal No. 57) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check earthing line for damage.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-52 TROUBLESHOOTING

Code No. P0120: Throttle Position Sensor System

Throttle position sensor circuit

B-06
(MU802078)

1 2 3 Throttle position sensor

3 1 2

C-129 (*1)
(MU801823)

71 72 73 74 75 76 77 78 79 80 81
B G GR
82 83 84 85 86 87 88 89 90 9192

C-124 (*2)
(MU803781)
41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57
58 59 60 61 62 63 64 65 66 81 (*1) or 84 (*1) or 92 (*1) or
46 (*2) 78 (*2) 57 (*2)
C-126 (*2)
(MU803782)
71 72 73 74 75 76 77 Engine-ECU <M/T>
78 79 80 81 8283 8485 8687 88 89 or
90 91 92 93 94 9596 97 98 Engine-A/T-ECU <A/T>
5V

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301116 AB

OPERATION • The sensor signal is inputted to the engine-ECU

• A power voltage of 5 V is applied to the throttle (terminal No. 84) <M/T> or engine-A/T-ECU
position sensor (terminal No. 3) from the (terminal No. 78) <A/T> from the throttle position
engine-ECU (terminal No. 81) or engine-A/T-ECU sensor output terminal (terminal No. 1).
(terminal No. 46) <A/T>.
• The power voltage is earthed to the engine-ECU FUNCTION
(terminal No. 92) <M/T> or engine-A/T-ECU • The throttle position sensor converts the opening
(terminal No. 46) <A/T> from the throttle position of the throttle valve into a voltage and inputs the
sensor (terminal No. 2). voltage signal to the engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
• In response to the signal, the engine-ECU <M/T>
or engine-A/T-ECU <A/T> checks the opening of
the throttle valve.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-53
TROUBLE JUDGMENT STEP 2. Connector check: B-06 throttle position
Check Condition sensor connector
• Ignition switch: ON (Excluding 2 seconds after
Connector: B-06
the ignition switch has been in "ON" position or B-06 (B)
just after the engine has started up.)
Judgment Criteria
• The sensor output voltage is 0.2 V or less for 2
seconds.
or
• When the engine speed is 1,000 r/min or less and
3 2 1
intake air pressure is 48 kPa or less, the throttle
position sensor output voltage is 4.6 V or more Harness side connector AK301117 AB

for 2 seconds.
Q: Is the check result normal?
PROBABLE CAUSE YES : Go to Step 3 .
• Failed throttle position sensor NO : Repair or replace.
• Open/short circuit in throttle position sensor
circuit or loose connector contact STEP 3. Check throttle position sensor itself.
• Failed engine-ECU <M/T> • Check throttle position sensor itself (Refer to
• Failed engine-A/T-ECU <A/T> P.13A-390).
Q: Is the check result normal?
DIAGNOSIS PROCEDURE YES : Go to Step 4 .
NO : Replace throttle position sensor.
STEP 1. MUT-II/III data list
• Refer to data list reference table P.13A-361. STEP 4. Perform voltage measurement at B-06
a. Item 14: Throttle position sensor throttle position sensor connector.
Q: Is the check result normal? Connector: B-06
YES : Intermittent malfunction (Refer to GROUP B-06 (B)
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Go to Step 2 .

3 2 1
Harness side connector AK301117 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Voltage between terminal No. 3 and earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 10 .
NO : Go to Step 5 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-54 TROUBLESHOOTING

Q: Is the check result normal?

STEP 5. Perform voltage measurement at C-129
YES : Go to Step 6 .
engine-ECU <M/T> connector or C-124 NO : Go to Step 7 .
engine-A/T-ECU <A/T> connector.
Connector: C-129
STEP 6. Connector check: C-129 engine-ECU
<L. H. drive vehicles>
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>
C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 C-129 (Y)
Harness side connector
AK301111AB

Connector: C-124 8180 79 78 77 76 75 74 73 72 71

<L. H. drive vehicles> 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>
C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector C-124 (GR)

AK301112 AB
46 45 44 43 42 41
• Measure engine-ECU <M/T> or engine-A/T-ECU 57 56 55 54 53 52 51 50 49 48 47
<A/T> terminal voltage. 66 65 64 63 62 61 60 59 58

• Ignition switch: ON Harness side connector

AK301112 AB
• Voltage between terminal No. 81 <M/T> or
terminal No. 46 <A/T> and earth.
OK: 4.9 − 5.1 V
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-55

Connector: B-06 STEP 7. Connector check: C-129 engine-ECU

B-06 (B)
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>

3 2 1
Harness side connector AK301117 AB C-129 (Y)

Q: Is the check result normal?

YES : Check and repair harness between B-06 <R. H. drive vehicles>
(terminal No. 3) throttle position sensor
connector and C-129 (terminal No. 81)
engine-ECU <M/T> connector or C-124
(terminal No. 46) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check power supply line for open
circuit.
NO : Repair or replace.
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 8 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-56 TROUBLESHOOTING

STEP 8. Check harness between B-06 (terminal Connector: C-124

No. 3) throttle position sensor connector and <L. H. drive vehicles>
C-129 (terminal No. 81) engine-ECU <M/T>
connector or C-124 (terminal No. 46)
engine-A/T-ECU <A/T> connector.
Connector: B-06
B-06 (B) C-124 (GR)

<R. H. drive vehicles>

3 2 1
Harness side connector AK301117 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check power supply line for short circuit.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 9 .
NO : Repair.
<R. H. drive vehicles>

STEP 9. MUT-II/III data list

• Refer to data list reference table P.13A-361.
a. Item 14: Throttle position sensor
Q: Is the check result normal?
C-129 (Y) YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
8180 79 78 77 76 75 74 73 72 71 NO : Replace engine-ECU <M/T> or
92 91 90 89 88 87 86 85 84 83 82
engine-A/T-ECU <A/T>.
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-57
STEP 10. Perform resistance measurement at STEP 11. Connector check: C-129 engine-ECU
B-06 throttle position sensor connector. <M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: B-06
B-06 (B)
Connector: C-129
<L. H. drive vehicles>

C-129 (Y)
3 2 1
Harness side connector AK301117 AB <R. H. drive vehicles>
• Disconnect connector, and measure at harness
side.
• Resistance between terminal No. 4 and earth.
OK: 2 Ω or less
Q: Is the check result normal? C-129 (Y)
YES : Go to Step 13 .
NO : Go to Step 11 .
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 12 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-58 TROUBLESHOOTING

STEP 12. Check harness between B-06 (terminal Connector: C-124

No. 2) throttle position sensor connector and <L. H. drive vehicles>
C-129 (terminal No. 92) engine-ECU <M/T>
connector or C-124 (terminal No. 72)
engine-A/T-ECU <A/T> connector.
Connector: B-06
B-06 (B) C-124 (GR)

<R. H. drive vehicles>

3 2 1
Harness side connector AK301117 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check earthing line for open circuit and damage.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 9 .
NO : Repair.
<R. H. drive vehicles>

STEP 13. Perform voltage measurement at B-06

throttle position sensor connector.
Connector: B-06
B-06 (B)
C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
3 2 1
Harness side connector AK301117 AB

• Use special tool test harness (MB991536) to

connect connector, and measure at pick-up
harness.
• Ignition switch: ON
• Voltage between terminal No. 3 and earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 15 .
NO : Go to Step 14 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-59
STEP 14. Connector check: C-129 engine-ECU Connector: B-06
B-06 (B)
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>

3 2 1
C-129 (Y) Harness side connector AK301117 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-06
(terminal No. 3) throttle position sensor
connector and C-129 (terminal No. 81)
engine-ECU <M/T> connector or C-124
(terminal No. 46) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check power supply line for damage.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 STEP 15. Perform voltage measurement at B-06
Harness side connector
AK301111AB
throttle position sensor connector.
Connector: B-06
Connector: C-124 B-06 (B)
<L. H. drive vehicles>

C-124 (GR)
3 2 1

<R. H. drive vehicles> Harness side connector AK301117 AB

• Use special tool test harness (MB991536) to

connect connector, and measure at pick-up
harness.
• Ignition switch: ON
• Voltage between terminal No. 2 and earth.
C-124 (GR) OK: 0.5 V or less
46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
Q: Is the check result normal?
66 65 64 63 62 61 60 59 58 YES : Go to Step 17 .
Harness side connector NO : Go to Step 16 .
AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-60 TROUBLESHOOTING

STEP 16. Connector check: C-129 engine-ECU Connector: B-06

B-06 (B)
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>

3 2 1
C-129 (Y) Harness side connector AK301117 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-06
(terminal No. 2) throttle position sensor
connector and C-129 (terminal No. 92)
engine-ECU <M/T> connector or C-124
(terminal No. 46) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check earthing line for damage.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 STEP 17. Perform voltage measurement at B-06
Harness side connector
AK301111AB
throttle position sensor connector.
Connector: B-06
Connector: C-124 B-06 (B)
<L. H. drive vehicles>

C-124 (GR)
3 2 1

<R. H. drive vehicles> Harness side connector AK301117 AB

• Use special tool test harness (MB991536) to

connect connector, and measure at pick-up
harness.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
C-124 (GR) OK:
46 45 44 43 42 41 Accelerator pedal fully released: 0.335 − 0.935
57 56 55 54 53 52 51 50 49 48 47 V
66 65 64 63 62 61 60 59 58
Accelerator pedal fully depressed: 4.5 − 5.0 V
Harness side connector
AK301112 AB
Q: Is the check result normal?
YES : Go to Step 20 .
NO : Go to Step 18 .

STEP 18. Adjust throttle position sensor

• Adjust throttle position sensor (Refer to
P.13A-383).
Q: Is the adjusted value normal?
YES : Go to Step 19 .
NO : Adjust throttle position sensor.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-61
STEP 19. Connector check: C-129 engine-ECU Connector: B-06
B-06 (B)
<M/T> connector or C-126 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>

3 2 1
C-129 (Y) Harness side connector AK301117 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-06
(terminal No. 1) throttle position sensor
connector and C-129 (terminal No. 84)
engine-ECU <M/T> connector or C-126
(terminal No. 78) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check output line for short circuit and
damage.
NO : Repair or replace.
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-62 TROUBLESHOOTING

Q: Is the check result normal?

STEP 20. Perform voltage measurement at C-129
YES : Go to Step 22 .
engine-ECU <M/T> connector or C-126 NO : Go to Step 21 .
engine-A/T-ECU <A/T> connector
Connector: C-129
STEP 21. Connector check: C-129 engine-ECU
<L. H. drive vehicles>
<M/T> connector or C-126 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>
C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 C-129 (Y)
Harness side connector
AK301111AB

Connector: C-126 8180 79 78 77 76 75 74 73 72 71

<L. H. drive vehicles> 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126
<L. H. drive vehicles>
C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector C-126 (GR)
AK301118 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU 77 76 75 74 73 72 71

89 88 87 86 85 84 83 82 81 80 79 78
<A/T> terminal voltage. 98 97 96 95 94 93 92 91 90
• Ignition switch: ON Harness side connector
AK301118 AB
• Voltage between terminal No. 84 <M/T> or
terminal No. 78 <A/T> and earth.
OK:
Accelerator pedal fully released: 0.335 − 0.935
V
Accelerator pedal fully depressed: 4.5 − 5.0 V
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-63

Connector: B-06 STEP 22. Connector check: C-129 engine-ECU

B-06 (B)
<M/T> connector or C-126 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>

3 2 1
Harness side connector AK301117 AB C-129 (Y)

Q: Is the check result normal?

YES : Check and repair harness between B-06 <R. H. drive vehicles>
(terminal No. 1) throttle position sensor
connector and C-129 (terminal No. 84)
engine-ECU <M/T> connector or C-126
(terminal No. 78) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check output line for open circuit and
damage.
NO : Repair or replace.
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-64 TROUBLESHOOTING

Code No. P0125: Feedback system monitor

OPERATION • Failed fuel system

• Refer to P0201 injector circuit P.13A-108. • Failed exhaust system
Refer to P0202 injector circuit P.13A-113. • Failed engine-ECU <M/T>
Refer to P0203 injector circuit P.13A-118. • Failed engine-A/T-ECU <A/T>
Refer to P0204 injector circuit P.13A-123.
• Refer to P0130 Oxygen sensor (front) circuit DIAGNOSIS PROCEDURE
P.13A-70.

FUNCTION STEP 1. MUT-II/III diagnosis code

• The engine-ECU<M/T> or engine-A/T-ECU<A/T> Q: Is any other diagnosis code than P0125 output?
effects air-fuel ratio feedback control in YES : Inspection chart for diagnosis code (Refer
accordance with the signals from the oxygen to P.13A-16).
sensor (front). NO : Go to Step 2 .
• If the oxygen sensor (front) has deteriorated,
corrections will be made by the oxygen sensor
STEP 2. MUT-II/III data list
(rear).
• Refer to data list reference table P.13A-361.
• Diagnosis code P0125 becomes stored in
a. Item 21: Engine coolant temperature sensor
memory if a failure is detected in the above
b. Item 32: Manifold absolute pressure sensor
air-fuel ratio feedback control system.
c. Item 59: Oxygen sensor (rear)
TROUBLE JUDGMENT Q: Are the check results normal?
YES : Go to Step 3 .
Check Conditions
NO : Perform the diagnosis code classified check
• The engine coolant temperature is approximately
procedure for the sensor that has shown an
82°C or more.
abnormal data valve (Refer to Inspection
• Within the range of air-fuel ratio feedback
Chart for diagnosis codes P.13A-16).
operation.
• Not in slowing down operation.
STEP 3. Check for intake of air from intake hose
Judgment Criterion
and inlet manifold.
• The oxygen sensor output voltage is not deviated
from 0.5 V for 30 seconds. Q: Is the check result normal?
YES : Go to Step 4 .
PROBABLE CAUSE NO : Repair.
• Failed oxygen sensor (front)
• Harness damage in oxygen sensor (front) circuit STEP 4. Check for leakage of exhaust emission
or loose connector contact from exhaust manifold.
• Failed oxygen sensor (rear)
Q: Is the check result normal?
NOTE: When the oxygen sensor (front) begins to
YES : Go to Step 5 .
deteriorate, the oxygen sensor output voltage will
NO : Repair.
deviate from the voltage when the sensor was new
(normally 0.5 volt at stoichiometric ratio). This
deviation will be corrected by the oxygen sensor STEP 5. Check throttle body (throttle valve
(rear).If the oxygen sensor (rear) responds poorly portion) for contamination.
because it has deteriorated, it will improperly correct Q: Is the check result normal?
the oxygen sensor (front). Thus, even when closed YES : Go to Step 6 .
loop control is being effected, the fluctuation of the NO : Clean throttle body (throttle valve portion)
oxygen sensor (front) output voltage decreases, (Refer to P.13A-383).
without intersecting with 0.5 volt. As a result, there is
a possibility of diagnosis code P0125 becoming
registered.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-65
STEP 6. Connector check: B-21 oxygen sensor Connector: C-126
(front) connector, C-129 engine-ECU <M/T> <L. H. drive vehicles>
connector or C-126 engine-A/T-ECU <A/T>
connector
Connector: B-21
C-126 (GR)

B-21 (B)
<R. H. drive vehicles>
2 1
4 3
Harness side
connector
Oxygen sensor (front)
AK301119 AB

C-126 (GR)
Connector: C-129
<L. H. drive vehicles> 77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

C-129 (Y) Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair or replace.
<R. H. drive vehicles>

STEP 7. Check oxygen sensor (front) itself.

• Check oxygen sensor (front) itself (Refer to
P.13A-391).
Q: Is the check result normal?
C-129 (Y) YES : Go to Step 8 .
NO : Replace oxygen sensor (front).

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-66 TROUBLESHOOTING

STEP 8. Check harness between B-21 oxygen Connector: C-126

sensor (front) connector and C-129 engine-ECU <L. H. drive vehicles>
<M/T> connector or C-126 engine-A/T-ECU <A/T>
connector.
Connector: B-21
C-126 (GR)

B-21 (B)
<R. H. drive vehicles>
2 1
4 3
Harness side
connector
Oxygen sensor (front)
AK301119 AB

C-126 (GR)
Connector: C-129
<L. H. drive vehicles> 77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

C-129 (Y) • Check output line for damage.

Q: Is the check result normal?
YES : Go to Step 9 .
<R. H. drive vehicles> NO : Repair.

STEP 9. Connector check: Injector connector

Connector: B-02, B-03, B-04, B-05

C-129 (Y) B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector M
AK301111AB
2 1
Harness side
connector
AK301120 AB

a. B-02 (No.1 injector connector)

b. B-03 (No.2 injector connector)
c. B-04 (No.3 injector connector)
d. B-05 (No.4 injector connector)
Q: Are the check results normal?
YES : Go to Step 10 .
NO : Repair.

STEP 10. Check injector itself.

• Check Injector itself (Refer to P.13A-393).
Q: Is the check result normal?
YES : Go to Step 11 .
NO : Replace injector.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-67
STEP 11. Connector check: B-16X engine control Connector: C-126
relay connector and C-129 engine-ECU <M/T> <L. H. drive vehicles>
connector or C-126 engine-A/T-ECU <A/T>
connector.
Connector: B-16X
B-16X
C-126 (GR)
Relay box’s
triangle marks
<R. H. drive vehicles>

2 1
4 3
Harness side
connector AK301121 AB

C-126 (GR)
Connector: C-129
<L. H. drive vehicles> 77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

C-129 (Y) Q: Is the check result normal?

YES : Go to Step 12 .
NO : Repair or replace.
<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-68 TROUBLESHOOTING

YES : Go to Step 13 .
STEP 12. Check harness between B-16X engine
NO : Repair.
control relay connector and injector connector.
Connector: B-16X
B-16X STEP 13. Check harness between injector
connector and C-134 engine-ECU<M/T>
Relay box’s
triangle marks connector or C-122 engine-A/T-ECU<A/T>
connector.
Connector: B-02, B-03, B-04, B-05
2 1
B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR)
4 3
Harness side
connector AK301121 AB

Connector: B-02, B-03, B-04, B-05

M
B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR) 2 1
Harness side
connector
AK301120 AB

Connector: C-123
<L. H. drive vehicles>
M
2 1
Harness side
connector
AK301120 AB

a. Check harness between B-16X (terminal No. 4) C-123 (Y)

engine control relay connector and B-02 (terminal
No. 1) No. 1 injector connector.
b. Check harness between B-16X (terminal No. 4) <R. H. drive vehicles>
engine control relay connector and B-03 (terminal
No. 1) No. 2 injector connector.
c. Check harness between B-16X (terminal No. 4)
engine control relay connector and B-04 (terminal
No. 1) No. 3 injector connector.
d. Check harness between B-16X (terminal No. 4) C-123 (Y)
engine control relay connector and B-05 (terminal
No. 1) No. 4 injector connector. 13 12 11 10 9 8 7 6 5 4 3 2 1
• Check power supply line for damage. 26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
Q: Are the check results normal? AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-69

Connector: C-122 STEP 14. Fuel pressure measurement.

<L. H. drive vehicles> • Fuel pressure measurement (Refer to
P.13A-384).
Q: Is the check result normal?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
C-122 (GR) NO : Repair.

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

a. Check harness between B-02 (terminal No. 2)

No. 1 injector connector and C-123 (terminal No.
1) engine-ECU <M/T> connector or C-122
(terminal No. 1) engine-A/T-ECU <A/T>
connector.
b. Check harness between B-03 (terminal No. 2)
No. 2 injector connector and C-123 (terminal No.
14) engine-ECU <M/T> connector or C-122
(terminal No. 9) engine-A/T-ECU <A/T>
connector.
c. Check harness between B-04 (terminal No. 2)
No. 3 injector connector and C-123 (terminal No.
2) engine-ECU <M/T> connector or C-122
(terminal No. 24) engine-A/T-ECU <A/T>
connector.
d. Check harness between B-05 (terminal No. 2)
No. 4 injector connector and C-123 (terminal No.
15) engine-ECU <M/T> connector or C-122
(terminal No. 2) engine-A/T-ECU <A/T>
connector.
Q: Are the check results normal?
YES : Go to Step 14 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-70 TROUBLESHOOTING

Code No. P0130: Oxygen Sensor (front) System <sensor 1>

Oxygen sensor (front) circuit

B-21
(MU802605)

Oxygen sensor (front)

1 2
3 4

1 3 2 4
From engine control relay
B W
To engine-ECU <M/T>
or
engine-A/T-ECU <A/T>
B
9
C-129 (*1) J/C (6)
(MU801823) C-12
92 (*1) or 76 (*1) or
57 (*2) 71 (*2) 8
71 72 73 74 75 76 77 78 79 80 81
82 83 84 85 86 87 88 89 90 9192 B

C-124 (*2)
(MU803781)
41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57
58 59 60 61 62 63 64 65 66 Engine-ECU <M/T>
or
C-126 (*2) Engine-A/T-ECU <A/T>
(MU803782)
71 72 73 74 75 76 77
78 79 80 81 8283 8485 8687 88 89
90 91 92 93 94 9596 97 98

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301124 AB

OPERATION FUNCTION
• The sensor signal is inputted to the engine-ECU • The oxygen sensor converts the concentration of
(terminal No. 76) <M/T> or engine-A/T-ECU oxygen in the exhaust emission into a voltage
(terminal No. 71) <A/T> from the oxygen sensor and inputs the signal to the engine-ECU <M/T> or
output terminal (terminal No. 4). engine-A/T-ECU <A/T>.
• The oxygen sensor (terminal No. 2) is earthed • When the air-fuel ratio is richer than the
with engine-ECU (terminal No. 92) <M/T> or theoretical air-fuel ratio, the oxygen sensor
engine-A/T-ECU (terminal No. 57) <A/T>. outputs a voltage of about 1 V. When it is leaner
than the theoretical air-fuel ratio, it outputs a
voltage of about 0 V.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-71
• In response to the signal, the engine-ECU <M/T> DIAGNOSIS PROCEDURE
or engine-A/T-ECU <A/T> controls the fuel
injection amount so that the air-fuel ratio can be
equivalent to the theoretical air-fuel ratio. STEP 1. MUT-II/III data list
• Refer to data list reference table P.13A-361.
TROUBLE JUDGMENT a. Item 11: Oxygen sensor (front)
Check Conditions Q: Is the check result normal?
• Above 3 minutes later after the engine has YES : Intermittent malfunction (Refer to GROUP
started up. 00 − How to Use Troubleshooting/Inspection
• The engine coolant temperature is approximately Service Points P.00-6).
82°C or more. NO : Go to Step 2 .
• The engine speed is 1,200 r/min or more.
• The volumetric efficiency 25% or more. STEP 2. Connector check: B-21 oxygen sensor
• The monitoring time is 5 seconds. (front) connector
Judgment Criterion Connector: B-21
• When the oxygen sensor (front) output voltage is
0.2 V or less and a power voltage of 5 V is
applied to the oxygen sensor (front) in the B-21 (B)
engine-ECU <M/T> or engine-A/T-ECU <A/T>,
the sensor output voltage is 4.5 V or more. 2 1
4 3
Check Condition Harness side
• The engine speed is 3,000 r/min or less. connector
• During the air-fuel ratio feedback control Oxygen sensor (front)
AK301119 AB
Judgment Criteria
• When the oxygen sensor (front) output frequency Q: Is the check result normal?
is 6 or less for 10 seconds on the average. YES : Go to Step 3 .
NO : Repair or replace.
PROBABLE CAUSE
• Failed oxygen sensor STEP 3. Perform resistance measurement at B-21
• Open/short circuit in oxygen sensor (front) circuit oxygen sensor (front) connector.
or loose connector contact
• Failed engine-ECU <M/T> Connector: B-21
• Failed engine-A/T-ECU <A/T>
B-21 (B)

2 1
4 3
Harness side
connector
Oxygen sensor (front)
AK301119 AB

• Disconnect connector, and measure at harness

side.
• Resistance between terminal No. 2 and earth.
OK: 2 Ω or less
Q: Is the check result normal?
YES : Go to Step 7 .
NO : Go to Step 4 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-72 TROUBLESHOOTING

STEP 4. Connector check: C-129 engine-ECU STEP 5. Check harness between B-21 (terminal
<M/T> connector or C-124 engine-A/T-ECU <A/T> No. 2) oxygen sensor (front) connector and C-129
connector (terminal No. 92) engine-ECU <M/T> connector or
Connector: C-129
C-124 (terminal No. 57) engine-A/T-ECU <A/T>
<L. H. drive vehicles> connector.
Connector: B-21

B-21 (B)
C-129 (Y)
2 1
4 3
<R. H. drive vehicles>
Harness side
connector
Oxygen sensor (front)
AK301119 AB

Connector: C-129
C-129 (Y) <L. H. drive vehicles>

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
C-129 (Y)
Harness side connector
AK301111AB

Connector: C-124 <R. H. drive vehicles>

<L. H. drive vehicles>

C-124 (GR) C-129 (Y)

<R. H. drive vehicles>

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 5 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-73

Connector: C-124 STEP 6. MUT-II/III data list

<L. H. drive vehicles> • Refer to data list reference table P.13A-361.
a. Item 11: Oxygen sensor (front)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
C-124 (GR)
Service Points P.00-6).
NO : . Replace engine-ECU <M/T> or
<R. H. drive vehicles> engine-A/T-ECU <A/T>.

STEP 7. Perform voltage measurement at B-21

oxygen sensor (front) connector.
Connector: B-21
C-124 (GR)

46 45 44 43 42 41 B-21 (B)
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58
2 1
Harness side connector
AK301112 AB 4 3
Harness side
• Check earthing line for open circuit and damage. connector
Q: Is the check result normal? Oxygen sensor (front)
AK301119 AB
YES : Go to Step 6 .
NO : Repair. • Use special tool test harness (MD998464) to
connect connector, and measure at pick-up
harness.
• Engine: After warm-up
• Ignition switch: ON
• Voltage between terminal No. 2 and earth.
OK: 0.5 V or less
Q: Is the check result normal?
YES : Go to Step 9 .
NO : Go to Step 8 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-74 TROUBLESHOOTING

STEP 8. Connector check: C-129 engine-ECU Connector: B-21

<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
B-21 (B)
Connector: C-129
<L. H. drive vehicles>
2 1
4 3
Harness side
connector
Oxygen sensor (front)
C-129 (Y) AK301119 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-21
(terminal No. 2) oxygen sensor (front)
connector and C-129 (terminal No. 92)
engine-ECU <M/T> connector or C-124
(terminal No. 57) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check earthing line for damage.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 STEP 9. Perform voltage measurement at B-21
Harness side connector
AK301111AB
oxygen sensor (front) connector.
Connector: B-21
Connector: C-124
<L. H. drive vehicles>
B-21 (B)

2 1
4 3
C-124 (GR) Harness side
connector
Oxygen sensor (front)
<R. H. drive vehicles> AK301119 AB

• Use special tool test harness (MD998464) to

connect connector, and measure at pick-up
harness.
• Engine: After warm-up
• Voltage between terminal No. 4 and earth.
C-124 (GR) OK:
46 45 44 43 42 41 600 − 1,000 mV when 200 mV or lower abrupt
57 56 55 54 53 52 51 50 49 48 47 racing is done a few seconds after abrupt
66 65 64 63 62 61 60 59 58
deceleration from 4,000 r/min.
Harness side connector
AK301112 AB
Q: Is the check result normal?
YES : Go to Step 12 .
NO : Go to Step 10 .

STEP 10. Check oxygen sensor itself

• Check oxygen sensor (front) itself (Refer to
P.13A-391).
Q: Is the check result normal?
YES : Go to Step 11 .
NO : Replace oxygen (front) sensor.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-75
STEP 11. Connector check: C-129 engine-ECU Connector: B-21
<M/T> connector or C-126 engine-A/T-ECU <A/T>
connector
B-21 (B)
Connector: C-129
<L. H. drive vehicles>
2 1
4 3
Harness side
connector
Oxygen sensor (front)
C-129 (Y) AK301119 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-21
(terminal No. 4) oxygen sensor (front)
connector and C-129 (terminal No. 76)
engine-ECU <M/T> connector or C-126
(terminal No. 71) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check output line for damage.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-76 TROUBLESHOOTING

STEP 12. Perform voltage measurement at C-129 deceleration from 4,000 r/min.
engine-ECU <M/T> connector or C-126 Q: Is the check result normal?
engine-A/T-ECU <A/T> connector. YES : Go to Step 14 .
NO : Go to Step 13 .
Connector: C-129
<L. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU

<A/T> terminal voltage.
• Transmission : Neutral<M/T> or P range<A/T>
• Engine: After warm-up
• Voltage between terminal No. 76 <M/T> or
terminal No. 71 <A/T> and earth.
OK:
600 − 1,000 mV when 200 mV or lower abrupt
racing is done a few seconds after abrupt
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-77
STEP 13. Connector check: C-129 engine-ECU Connector: B-21
<M/T> connector or C-126 engine-A/T-ECU <A/T>
connector
B-21 (B)
Connector: C-129
<L. H. drive vehicles>
2 1
4 3
Harness side
connector
Oxygen sensor (front)
C-129 (Y) AK301119 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-21
(terminal No. 4) oxygen sensor (front)
connector and C-129 (terminal No. 76)
engine-ECU <M/T> connector or C-126
(terminal No. 71) engine-A/T-ECU <A/T>
connector.
C-129 (Y)
• Check output line for open circuit.
NO : Repair or replace.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-78 TROUBLESHOOTING

STEP 14. Connector check: C-129 engine-ECU

<M/T> connector or C-126 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

Q: Is the check result normal?

YES : Go to Step 6 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-79

Code No. P0135: Oxygen Sensor Heater (front) System <sensor 1>

Oxygen sensor heater (front) circuit

Battery

B-Y

B-Y

1 2 Oxygen sensor (front)

B-16X B-21
(MU8026053)
1 2 Engine
control
3 4 relay 1 2
3 4
4 3

1 3 2 4

To engine-ECU <M/T>
R-Y or
engine-A/T-ECU <A/T>

L-R

60 (*1) or
C-122 (*2) 3 (*2) C-127 (*1)
(MU803784) (MU801820)

71 72 73 74 75 76 77
78 79 80 81 82 83 84 85 86 87 88 89 90 51 52 53 54 55 56
91 92 93 94 95 96 97 98 99 100 57 58 59 60 61 62

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301125 AB

OPERATION • The heater (terminal No. 3) of the oxygen sensor

• Power is supplied to the heater power terminal (front) connector is controlled by the power
(terminal No. 1) of the oxygen sensor (front) transistor in the engine-ECU (terminal No. 60)
connector from the engine control relay (terminal <M/T> or engine-A/T-ECU (terminal No. 3)
No. 4). <A/T>.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-80 TROUBLESHOOTING

FUNCTION YES : Go to Step 2 .

• The power supply to the oxygen sensor heater NO : Repair or replace.
(front) is controlled by the ON/OFF control of the
power transistor in the engine-ECU <M/T> or STEP 2. Perform resistance measurement at B-21
engine-A/T-ECU <A/T>. oxygen sensor (front) connector.
• Heating the oxygen sensor heater (front) enables
the oxygen sensor to provide good response Connector: B-21
even when the exhaust emission temperature is
low.
B-21 (B)
TROUBLE JUDGMENT
2 1
Check Conditions 4 3
• The engine coolant temperature is 20°C or Harness side
higher. connector
• The oxygen sensor heater (front) is in "ON" Oxygen sensor (front)
AK301119 AB
position.
• The engine speed is 50 r/min or more. • Disconnect connector, and measure at sensor
• The battery voltage is 11 − 16 V. side.
• Resistance between terminal No. 1 and No. 3.
Judgment Criterion
OK: 4.5 − 8.0 Ω
• The heater current of oxygen sensor heater
(front) is below 0.2 A or above 3.5 A for 1 second. Q: Is the check result normal?
YES : Go to Step 3 .
PROBABLE CAUSE NO : Replace oxygen sensor (front).
• Failed oxygen sensor heater (front)
• Open/short circuit in oxygen sensor heater (front)
STEP 3. Perform voltage measurement at B-21
circuit or loose connector contact
oxygen sensor (front) connector.
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T> Connector: B-21

DIAGNOSIS PROCEDURE
B-21 (B)

STEP 1. Connector check: B-21 oxygen sensor 2 1

(front) connector 4 3
Harness side
Connector: B-21 connector
Oxygen sensor (front)
AK301119 AB
B-21 (B)
• Disconnect connector, and measure at harness
side.
2 1
• Ignition switch: ON
4 3
• Voltage between terminal No. 1 and earth.
Harness side
connector OK: System voltage
Oxygen sensor (front)
AK301119 AB Q: Is the check result normal?
YES : Go to Step 5 .
Q: Is the check result normal? NO : Go to Step 4 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-81
STEP 4. Connector check: B-16X engine control STEP 5. Perform voltage measurement at C-127
relay connector engine-ECU <M/T> connector or C-122
engine-A/T-ECU <A/T> connector.
Connector: B-16X
B-16X Connector: C-127
Relay box’s <L. H. drive vehicles>
triangle marks

2 1
4 3 C-127 (Y)

Harness side
connector AK301121 AB
<R. H. drive vehicles>

Connector: B-21

B-21 (B)
C-127 (Y)
2 1
4 3
Harness side
8180 79 78 77 76 75 74 73 72 71
connector
92 91 90 89 88 87 86 85 84 83 82
Oxygen sensor (front)
AK301119 AB
Harness side connector
AK301126AB

Q: Is the check result normal? Connector: C-122

YES : Check and repair harness between B-21
<L. H. drive vehicles>
(terminal No. 1) oxygen sensor connector
and B-16X (terminal No. 4) engine control
relay connector.
• Check power supply line for
open/short circuit. C-122 (GR)
NO : Repair or replace.

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU

<A/T> terminal voltage.
• Ignition switch: ON
• Voltage between terminal No. 60 <M/T> or
terminal No. 3 <A/T> and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 8 .
NO : Go to Step 6 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-82 TROUBLESHOOTING

STEP 6. Connector check: C-127 engine-ECU STEP 7. Check harness between B-21 (terminal
<M/T> connector or C-122 engine-A/T-ECU <A/T> No. 3) oxygen sensor (front) connector and C-127
connector (terminal No. 60) engine-ECU <M/T> connector or
Connector: C-127
C-122 (terminal No. 3) engine-A/T-ECU <A/T>
<L. H. drive vehicles> connector.
Connector: B-21

B-21 (B)
C-127 (Y)
2 1
4 3
<R. H. drive vehicles>
Harness side
connector
Oxygen sensor (front)
AK301119 AB

Connector: C-127
<L. H. drive vehicles>
C-127 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector C-127 (Y)
AK301126AB

Connector: C-122 <R. H. drive vehicles>

<L. H. drive vehicles>

C-122 (GR) C-127 (Y)

<R. H. drive vehicles>

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301126AB

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-83

Connector: C-122 STEP 8. Connector check: C-127 engine-ECU

<L. H. drive vehicles> <M/T> connector or C-122 engine-A/T-ECU <A/T>
connector
Connector: C-127
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-127 (Y)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 C-127 (Y)
Harness side connector
AK301123 AB

• Check earthing line for open/short circuit. 8180 79 78 77 76 75 74 73 72 71

92 91 90 89 88 87 86 85 84 83 82
Q: Is the check result normal? Harness side connector
YES : Replace engine-ECU <M/T> or AK301126AB

engine-A/T-ECU <A/T>.
NO : Repair. Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-84 TROUBLESHOOTING

STEP 9. Check harness between B-21 (terminal STEP 10. Check harness between B-21 (terminal
No. 1) oxygen sensor (front) connector and No. 3) oxygen sensor (front) connector and C-127
B-16X (terminal No. 4) engine control relay (terminal No. 60) engine-ECU <M/T> connector or
connector. C-122 (terminal No. 3) engine-A/T-ECU <A/T>
connector.
Connector: B-21
Connector: B-21

B-21 (B)
B-21 (B)
2 1
4 3 2 1
Harness side 4 3
connector Harness side
Oxygen sensor (front) connector
AK301119 AB
Oxygen sensor (front)
AK301119 AB
Connector: B-16X
B-16X Connector: C-127
Relay box’s <L. H. drive vehicles>
triangle marks

2 1
4 3 C-127 (Y)

Harness side
connector AK301121 AB
<R. H. drive vehicles>
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 10 .
NO : Repair.
C-127 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301126AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-85

Connector: C-122 STEP 11. Check the trouble symptoms.

<L. H. drive vehicles>
Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
C-122 (GR) Service Points P.00-6).

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check earthing line for damage.

Q: Is the check result normal?
YES : Go to Step 11 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-86 TROUBLESHOOTING

Code No. P0136: Oxygen Sensor (rear) System <sensor 2>

Oxygen sensor (rear) circuit

C-130 (*3) or
C-37 (*4)
MU801446

1 2 3 4 Oxygen sensor (rear)

From engine control relay 1 2 3 4

To engine-ECU <M/T> B
or
engine-A/T-ECU <A/T>
10
C-129 (*1) P L
(MU801823) J/C (6)
C-12
71 72 73 74 75 76 77 78 79 80 81 92 (*1) or 75 (*1) or
57 (*2) 73 (*2) 8
82 83 84 85 86 87 88 89 90 9192 B
C-124 (*2)
(MU803781)
41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57
58 59 60 61 62 63 64 65 66
Engine-ECU <M/T>
C-126 (*2) or
(MU803782) Engine-A/T-ECU <A/T>
71 72 73 74 75 76 77
78 79 80 81 8283 8485 8687 88 89
90 91 92 93 94 9596 97 98

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301127 AB

OPERATION FUNCTION
• The sensor signal is inputted to the engine-ECU • The oxygen sensor (rear) converts the
(terminal No. 75) <M/T> or engine-A/T-ECU concentration of oxygen in the exhaust emission
(terminal No. 73) <A/T> from the oxygen sensor into a voltage signal and inputs the voltage signal
(rear) output terminal (terminal No. 4). to the engine-ECU <M/T> or engine-A/T-ECU
• The oxygen sensor (rear) (terminal No. 3) is <A/T>.
earthed with engine-ECU (terminal No. 92) • When the air-fuel ratio is richer than the
<M/T> or engine-A/T-ECU (terminal No. 57) theoretical air-fuel ratio, the oxygen sensor (rear)
<A/T>. outputs a voltage of about 1 V. When it is leaner
than the theoretical air-fuel ratio, it outputs a
voltage of about 0 V.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-87
• In response to the signal, the engine-ECU <M/T> STEP 1. MUT-II/III data list
or engine-A/T-ECU <A/T> controls the fuel • Refer to data list reference table P.13A-361.
injection amount so that the air-fuel ratio can be a. Item 59: Oxygen sensor (rear)
equivalent to the theoretical air-fuel ratio.
Q: Is the check result normal?
TROUBLE JUDGMENT YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Check Conditions
Service Points P.00-6).
• Above 3 minutes later after the engine has
NO : Go to Step 2 .
started up.
• The engine coolant temperature is 82°C or
higher. STEP 2. Connector check: C-130*1 or C-37*2
• The engine speed is 1,200 r/min or more. oxygen sensor (rear) connector
• The volumetric efficiency is 25% or more. Connector: C-130 <L. H. drive vehicles>,
• The monitoring time is 5 seconds. C-37 <R. H. drive vehicles>

Judgment Criteria Oxygen sensor

• When the oxygen sensor (rear) output voltage is (rear)
0.2 V or less and a power voltage of 5 V is
applied to the oxygen sensor (rear) in the
engine-ECU<M/T> or engine-A/T-ECU <A/T>,
the sensor output voltage is 4.5 V or more.

PROBABLE CAUSE
• Failed oxygen sensor
• Open/short circuit in oxygen sensor (rear) circuit 4 3 2 1
or loose connector contact Harness side
• Failed engine-ECU <M/T> connector
• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE
NOTE: . C-130 <L. H. drive vehicles>,
C-37 <R. H. drive vehicles>
*1: L.H. drive vehicles
AK301128 AB
*2: R.H. drive vehicles
Q: Is the check result normal?
YES : Go to Step 3 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-88 TROUBLESHOOTING

STEP 3. Perform resistance measurement at STEP 4. Connector check: C-129 engine-ECU

C-130*1 or C-37*2 oxygen sensor (rear) connector. <M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-130 <L. H. drive vehicles>,
C-37 <R. H. drive vehicles> Connector: C-129
<L. H. drive vehicles>
Oxygen sensor
(rear)

C-129 (Y)

<R. H. drive vehicles>

4 3 2 1
Harness side
connector

C-129 (Y)

C-130 <L. H. drive vehicles>,

C-37 <R. H. drive vehicles> 8180 79 78 77 76 75 74 73 72 71
AK301128 AB 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
• Disconnect connector, and measure at harness AK301111AB

side.
Connector: C-124
• Resistance between terminal No. 3 and earth.
<L. H. drive vehicles>
OK: 2 Ω or less
Q: Is the check result normal?
YES : Go to Step 7 .
NO : Go to Step 4 .
C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 5 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-89
STEP 5. Check harness between C-130*1 or Connector: C-124
C-37*2 (terminal No. 3) oxygen sensor (rear) <L. H. drive vehicles>
connector and C-129 (terminal No. 92)
engine-ECU <M/T> connector or C-124 (terminal
No. 57) engine-A/T-ECU <A/T> connector.
Connector: C-130 <L. H. drive vehicles>,
C-37 <R. H. drive vehicles> C-124 (GR)

Oxygen sensor
(rear) <R. H. drive vehicles>

C-124 (GR)

4 3 2 1 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
Harness side 66 65 64 63 62 61 60 59 58
connector Harness side connector
AK301112 AB

• Check earthing line for open circuit and damage.

Q: Is the check result normal?
C-130 <L. H. drive vehicles>, YES : Go to Step 6 .
C-37 <R. H. drive vehicles> NO : Repair.
AK301128 AB

Connector: C-129 STEP 6. MUT-II/III data list

<L. H. drive vehicles> • Refer to data list reference table P.13A-361.
a. Item 59: Oxygen sensor (rear)
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
C-129 (Y) 00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Replace engine-ECU <M/T> or
<R. H. drive vehicles> engine-A/T-ECU <A/T>.

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-90 TROUBLESHOOTING

STEP 7. Perform voltage measurement at C-130*1 STEP 8. Connector check: C-129 engine-ECU
or C-37*2 oxygen sensor (rear) connector. <M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-130 <L. H. drive vehicles>,
C-37 <R. H. drive vehicles> Connector: C-129
<L. H. drive vehicles>
Oxygen sensor
(rear)

C-129 (Y)

<R. H. drive vehicles>

4 3 2 1
Harness side
connector

C-129 (Y)

C-130 <L. H. drive vehicles>,

C-37 <R. H. drive vehicles> 8180 79 78 77 76 75 74 73 72 71
AK301128 AB 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
• Use special tool test harness (MB991658) to AK301111AB

connect connector, and measure at pick-up

Connector: C-124
harness.
<L. H. drive vehicles>
• Engine: After warm-up
• Ignition switch: ON
• Voltage between terminal No. 3 and earth.
OK: 0.5 V or less
Q: Is the check result normal? C-124 (GR)
YES : Go to Step 9 .
NO : Go to Step 8 .
<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-91

Connector: C-130 <L. H. drive vehicles>, STEP 9. Perform voltage measurement at C-130*1
C-37 <R. H. drive vehicles> or C-37*2 oxygen sensor (rear) connector.
Oxygen sensor Connector: C-130 <L. H. drive vehicles>,
(rear) C-37 <R. H. drive vehicles>

Oxygen sensor
(rear)

4 3 2 1
Harness side
connector
4 3 2 1
Harness side
connector

C-130 <L. H. drive vehicles>,

C-37 <R. H. drive vehicles>
AK301128 AB
C-130 <L. H. drive vehicles>,
Q: Is the check result normal? C-37 <R. H. drive vehicles>
YES : Check and repair harness between C-130*1 AK301128 AB

or C-37*2 (terminal No. 3) oxygen sensor • Use special tool test harness (MB991658) to
connector and C-129 (terminal No. 92) connect connector, and measure at pick-up
engine-ECU <M/T> connector or C-124 harness.
(terminal No. 57) engine-A/T-ECU <A/T> • Engine: After warm-up
connector. • Voltage between terminal No. 4 and earth.
• Check earthing line for damage. OK:
NO : Repair or replace. 600 − 1,000 mV when 200 mV or lower abrupt
racing is done a few seconds after abrupt
deceleration from 4,000 r/min.
Q: Is the check result normal?
YES : Go to Step 12 .
NO : Go to Step 10 .

STEP 10. Check oxygen sensor (rear) itself.

• Check oxygen sensor (rear) itself (Refer to
P.13A-391).
Q: Is the check result normal?
YES : Go to Step 11 .
NO : Replace oxygen (rear) sensor.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-92 TROUBLESHOOTING

STEP 11. Connector check: C-129 engine-ECU Connector: C-130 <L. H. drive vehicles>,
<M/T> connector or C-126 engine-A/T-ECU <A/T> C-37 <R. H. drive vehicles>
connector Oxygen sensor
Connector: C-129 (rear)
<L. H. drive vehicles>

C-129 (Y)

4 3 2 1
<R. H. drive vehicles>
Harness side
connector

C-129 (Y) C-130 <L. H. drive vehicles>,

C-37 <R. H. drive vehicles>
AK301128 AB

8180 79 78 77 76 75 74 73 72 71
Q: Is the check result normal?
92 91 90 89 88 87 86 85 84 83 82
YES : Check and repair harness between C-130*1
Harness side connector
AK301111AB
or C-37*2 (terminal No. 4) oxygen sensor
connector and C-129 (terminal No. 75)
Connector: C-126
<L. H. drive vehicles>
engine-ECU <M/T> connector or C-126
<terminal No. 73) engine-A/T-ECU <A/T>
connector.
• Check output line for damage.
NO : Repair or replace.
C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-93
Q: Is the check result normal?
STEP 12. Perform voltage measurement at C-129
YES : Go to Step 14 .
engine-ECU <M/T> connector or C-126 NO : Go to Step 13 .
engine-A/T-ECU <A/T> connector.
Connector: C-129
STEP 13. Connector check: C-129 engine-ECU
<L. H. drive vehicles>
<M/T> connector or C-126 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>
C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 C-129 (Y)
Harness side connector
AK301111AB

Connector: C-126 8180 79 78 77 76 75 74 73 72 71

<L. H. drive vehicles> 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126
<L. H. drive vehicles>
C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB C-126 (GR)
• Measure engine-ECU <M/T> or engine-A/T-ECU 77 76 75 74 73 72 71
<A/T> terminal voltage. 89 88 87 86 85 84 83 82 81 80 79 78
• Transmission : Neutral<M/T> or P range<A/T> 98 97 96 95 94 93 92 91 90

• Engine: After warm-up Harness side connector

AK301118 AB
• Voltage between terminal No. 75 <M/T> or
terminal No. 73 <A/T> and earth.
OK:
600 − 1,000 mV when 200 mV or lower abrupt
racing is done a few seconds after abrupt
deceleration from 4,000 r/min.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-94 TROUBLESHOOTING

Connector: C-130 <L. H. drive vehicles>, STEP 14. Connector check: C-129 engine-ECU
C-37 <R. H. drive vehicles> <M/T> connector or C-126 engine-A/T-ECU <A/T>
Oxygen sensor
connector
(rear) Connector: C-129
<L. H. drive vehicles>

C-129 (Y)

4 3 2 1
<R. H. drive vehicles>
Harness side
connector

C-130 <L. H. drive vehicles>, C-129 (Y)

C-37 <R. H. drive vehicles>
AK301128 AB

8180 79 78 77 76 75 74 73 72 71
Q: Is the check result normal?
92 91 90 89 88 87 86 85 84 83 82
YES : Check and repair harness between C-130*1
Harness side connector
or C-37*2 (terminal No. 4) oxygen sensor AK301111AB

(rear) connector and C-129 (terminal No.

Connector: C-126
75) engine-ECU <M/T> connector or C-126 <L. H. drive vehicles>
<terminal No. 73) engine-A/T-ECU <A/T>
connector.
• Check output line for open circuit.
NO : Repair or replace.
C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

Q: Is the check result normal?

YES : Go to Step 6 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-95

Code No. P0141: Oxygen Sensor Heater (rear) System <sensor 2>

Oxygen sensor heater (rear) circuit

Battery

B-Y
B-Y

1 2 Oxygen sensor (rear)

B-16X C-130 (*3) or
C-37 (*4)
Engine MU8011446
1 2
control
3 4 relay
1 2 3 4

4 3

1 2 3 4
R-Y

R-Y To engine-ECU <M/T>

28 or
engine-A/T-ECU <A/T>
J/C (6)
C-12
29
L-Y

C-127 (*1)
(MU801820)
54 (*1) or
51 52 53 54 55 56 26 (*2)
57 58 59 60 61 62

C-122 (*2)
(MU803784)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 3132 33 34 35 Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301129AB

OPERATION connector from the engine control relay (terminal

• Power is supplied to the heater power terminal No. 4).
(terminal No. 1) of the oxygen sensor (rear)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-96 TROUBLESHOOTING

• The heater (terminal No. 2) of the oxygen sensor DIAGNOSIS PROCEDURE

(rear) connector is controlled by the power
NOTE: .
transistor in the engine-ECU (terminal No. 54)
*1: L.H. drive vehicles
<M/T> or engine-A/T-ECU (terminal No. 26)
*2: R.H. drive vehicles
<A/T>.

FUNCTION STEP 1. Connector check: C-130*1 or C-37*2

• The power supply to the oxygen sensor heater oxygen sensor (rear) connector
(rear) is controlled by the ON/OFF control of the
Connector: C-130 <L. H. drive vehicles>,
power transistor in the engine-ECU <M/T> or C-37 <R. H. drive vehicles>
engine-A/T-ECU <A/T>.
• Heating the oxygen sensor heater (rear) enables Oxygen sensor
(rear)
the oxygen sensor to provide good response
even when the exhaust emission temperature is
low.

TROUBLE JUDGMENT
Check Conditions
• The engine coolant temperature is 20°C or
higher. 4 3 2 1
• The oxygen sensor heater (rear) is in "ON" Harness side
position. connector
• The engine speed is 50 r/min or more.
• The battery voltage is 11 − 16 V.
Judgment Criteria
• The heater current of front oxygen sensor heater C-130 <L. H. drive vehicles>,
(rear) is below 0.2 A or above 3.5 A for 1 second. C-37 <R. H. drive vehicles>
AK301128 AB
PROBABLE CAUSE
• Failed oxygen sensor heater (rear) Q: Is the check result normal?
• Open/short circuit in oxygen sensor (rear) circuit YES : Go to Step 2 .
NO : Repair or replace.
or loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-97
STEP 2. Perform resistance measurement at STEP 3. Perform voltage measurement at C-130*1
C-130*1 or C-37*2 oxygen sensor (rear) connector. or C-37*2 oxygen sensor (rear) connector.
Connector: C-130 <L. H. drive vehicles>, Connector: C-130 <L. H. drive vehicles>,
C-37 <R. H. drive vehicles> C-37 <R. H. drive vehicles>

Oxygen sensor Oxygen sensor

(rear) (rear)

4 3 2 1 4 3 2 1
Harness side Harness side
connector connector

C-130 <L. H. drive vehicles>, C-130 <L. H. drive vehicles>,

C-37 <R. H. drive vehicles> C-37 <R. H. drive vehicles>
AK301128 AB AK301128 AB

• Disconnect connector, and measure at sensor • Disconnect connector, and measure at harness
side. side.
• Resistance between terminal No. 1 and No. 2. • Ignition switch: ON
OK: 4 − 8 Ω • Voltage between terminal No. 1 and earth.
Q: Is the check result normal?
OK: System voltage
YES : Go to Step 3 . Q: Is the check result normal?
NO : Replace oxygen (rear) sensor. YES : Go to Step 5 .
NO : Go to Step 4 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-98 TROUBLESHOOTING

STEP 4. Connector check: B-16X engine control STEP 5. Perform voltage measurement at C-127
relay connector engine-ECU <M/T> connector or C-122
engine-A/T-ECU <A/T> connector.
Connector: B-16X
B-16X Connector: C-127
Relay box’s <L. H. drive vehicles>
triangle marks

2 1
4 3 C-127 (Y)

Harness side
connector AK301121 AB
<R. H. drive vehicles>

Connector: C-130 <L. H. drive vehicles>,

C-37 <R. H. drive vehicles>

Oxygen sensor
(rear)
C-127 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301126AB

4 3 2 1 Connector: C-122
Harness side <L. H. drive vehicles>
connector

C-130 <L. H. drive vehicles>, C-122 (GR)

C-37 <R. H. drive vehicles>
AK301128 AB
<R. H. drive vehicles>
Q: Is the check result normal?
YES : Check intermediate connector C-12*1 or
C-134*2, and repair if necessary. If
intermediate connector is normal, check and
repair harness between C-130*1 or C-37*2
C-122 (GR)
(terminal No. 1) oxygen sensor (rear)
connector and B-16X (terminal No. 4) 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
engine control relay connector. 100 99 98 97 96 95 94 93 92 91
• Check power supply line for Harness side connector
open/short circuit. AK301123 AB
NO : Repair or replace. • Measure engine-ECU <M/T> or engine-A/T-ECU
<A/T> terminal voltage.
• Ignition switch: ON
• Voltage between terminal No. 54 <M/T> or
terminal No. 26 <A/T> and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 8 .
NO : Go to Step 6 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-99
Q: Is the check result normal?
STEP 6. Connector check: C-127 engine-ECU
YES : Go to Step 7 .
<M/T> connector or C-122 engine-A/T-ECU <A/T> NO : Repair or replace.
connector
Connector: C-127
<L. H. drive vehicles>

C-127 (Y)

<R. H. drive vehicles>

C-127 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301126AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-100 TROUBLESHOOTING

STEP 7. Check harness between C-130*1 or Connector: C-122

C-37*2 (terminal No. 2) oxygen sensor connector <L. H. drive vehicles>
and C-127 (terminal No. 54) engine-ECU <M/T>
connector or C-122 (terminal No. 26)
engine-A/T-ECU <A/T> connector.
Connector: C-130 <L. H. drive vehicles>,
C-37 <R. H. drive vehicles> C-122 (GR)

Oxygen sensor
(rear) <R. H. drive vehicles>

C-122 (GR)

4 3 2 1 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
Harness side 100 99 98 97 96 95 94 93 92 91
connector Harness side connector
AK301123 AB

• Check earthing line for open/short circuit.

Q: Is the check result normal?
C-130 <L. H. drive vehicles>, YES : Replace engine-ECU <M/T> or
C-37 <R. H. drive vehicles> engine-A/T-ECU <A/T>.
AK301128 AB NO : Repair.
Connector: C-127
<L. H. drive vehicles>

C-127 (Y)

<R. H. drive vehicles>

C-127 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301126AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-101
STEP 8. Connector check: C-127 engine-ECU STEP 9. Check harness between C-130*1 or
<M/T> connector or C-122 engine-A/T-ECU <A/T> C-37*2 (terminal No. 1) oxygen sensor connector
connector and B-16X (terminal No. 4) engine control relay
Connector: C-127
connector.
<L. H. drive vehicles> Connector: C-130 <L. H. drive vehicles>,
C-37 <R. H. drive vehicles>

Oxygen sensor
(rear)

C-127 (Y)

<R. H. drive vehicles>

4 3 2 1
Harness side
C-127 (Y) connector

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector C-130 <L. H. drive vehicles>,
AK301126AB C-37 <R. H. drive vehicles>
AK301128 AB
Connector: C-122
<L. H. drive vehicles> Connector: B-16X
B-16X
Relay box’s
triangle marks

C-122 (GR)
2 1
4 3
<R. H. drive vehicles>
Harness side
connector AK301121 AB

NOTE: Before checking harness, check intermediate

connector C-12*1 or C-134*2, and repair if necessary.
• Check power supply line for damage.
C-122 (GR)
Q: Is the check result normal?
77 76 75 74 73 72 71 YES : Go to Step 10 .
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
NO : Repair.
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-102 TROUBLESHOOTING

STEP 10. Check harness between C-130*1 or Connector: C-122

C-37*2 (terminal No. 2) oxygen sensor connector <L. H. drive vehicles>
and C-127 (terminal No. 54) engine-ECU
connector <M/T> connector or C-122 (terminal
No. 26) engine-A/T-ECU <A/T>.
Connector: C-130 <L. H. drive vehicles>,
C-37 <R. H. drive vehicles> C-122 (GR)

Oxygen sensor
(rear) <R. H. drive vehicles>

C-122 (GR)

4 3 2 1 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
Harness side 100 99 98 97 96 95 94 93 92 91
connector Harness side connector
AK301123 AB

• Check earthing line for damage.

Q: Is the check result normal?
C-130 <L. H. drive vehicles>, YES : Go to Step 11 .
C-37 <R. H. drive vehicles> NO : Repair.
AK301128 AB

Connector: C-127 STEP 11. Check the trouble symptoms.

<L. H. drive vehicles>
Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
C-127 (Y)
Service Points P.00-6).

<R. H. drive vehicles>

C-127 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301126AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-103

Code No. P0170: Abnormal Fuel System

OPERATION DIAGNOSIS PROCEDURE

• Refer to P0201 injector circuit P.13A-108.
• Refer to P0202 injector circuit P.13A-113.
• Refer to P0203 injector circuit P.13A-118. STEP 1. MUT-II/III diagnosis code
• Refer to P0204 injector circuit P.13A-123. Q: Is any other diagnosis code than P0170 output?
YES : Inspection chart for diagnosis code (Refer
FUNCTION to P.13A-16).
• If the fuel system goes out of order, the fuel NO : Go to Step 2 .
correction value will become larger.
• The engine-ECU <M/T> or engine-A/T-ECU
STEP 2. MUT-II/III data list
<A/T> checks whether the fuel correction value is
• Refer to data list reference table P.13A-361.
within the standard limits.
a. Item 13: Intake air temperature sensor
TROUBLE JUDGMENT b. Item 21: Engine coolant temperature sensor
c. Item 32: Manifold absolute pressure sensor
Check Conditions
• In learning air-fuel ratio Q: Are the check results normal?
YES : Go to Step 3 .
Judgment Criteria NO : Perform the diagnosis code classified check
• The compensation value of fuel injection amount procedure for the sensor that has shown an
is too low for 2 seconds or more. abnormal data value (Refer to Inspection
or Chart for diagnosis codes P.13A-16).
• The compensation value of fuel injection amount
is too high for 2 seconds or more.
STEP 3. Check for intake of air from intake hose
PROBABLE CAUSE and inlet manifold.
• Failed fuel supply system Q: Is the check result normal?
• Failed oxygen sensor (front) YES : Go to Step 4 .
• Failed intake air temperature sensor NO : Repair.
• Failed purge control solenoid valve
• Failed engine-ECU <M/T>
STEP 4. Check for leakage of exhaust emission
• Failed engine-A/T-ECU <A/T>
from exhaust manifold.
Q: Is the check result normal?
YES : Go to Step 5 .
NO : Repair.

STEP 5. Check throttle body (throttle valve

portion) for contamination.
Q: Is the check result normal?
YES : Go to Step 6 .
NO : Clean throttle body (throttle valve portion)
(Refer to P.13A-383).

STEP 6. MUT-II/III data list

• Refer to data list reference table P.13A-361.
a. Item 11: Oxygen sensor (front).
Q: Is the check result normal?
YES : Go to Step 7 .
NO : Check oxygen sensor (front) system (Refer
toP.13A-70, Code No. P0130).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-104 TROUBLESHOOTING

STEP 7. Connector Check: Injector connector STEP 9. Connector check: B-16X engine control
relay connector and B-123 engine-ECU <M/T>
Connector: B-02, B-03, B-04, B-05
connector or C-122 engine-A/T-ECU <A/T>
B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR) connector.
Connector: B-16X
B-16X
Relay box’s
triangle marks
M
2 1
Harness side
connector 2 1
AK301120 AB
4 3
a. B-02 (No.1 injector connector).
b. B-03 (No.2 injector connector). Harness side
connector AK301121 AB
c. B-04 (No.3 injector connector).
d. B-05 (No.4 injector connector). Connector: C-123
Q: Are the check results normal? <L. H. drive vehicles>
YES : Go to Step 8 .
NO : Repair or replace.

STEP 8. Check injector itself.

C-123 (Y)
• Check Injector itself (Refer to P.13A-393).
Q: Is the check result normal?
<R. H. drive vehicles>
YES : Go to Step 9 .
NO : Replace injector.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-105

Connector: C-122 STEP 10. Check harness between B-16X engine

<L. H. drive vehicles> control relay connector and injector connector.
Connector: B-02, B-03, B-04, B-05

B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR)

C-122 (GR)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AB

Connector: B-16X
B-16X
C-122 (GR)
Relay box’s
77 76 75 74 73 72 71 triangle marks
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB 2 1
4 3
Q: Is the check result normal?
YES : Go to Step 10 . Harness side
connector AK301121 AB
NO : Repair or replace.
a. Check harness between B-16X (terminal No. 4)
engine control relay connector and B-02 (terminal
No. 1) No. 1 injector connector.
b. Check harness between B-16X (terminal No. 4)
engine control relay connector and B-03 (terminal
No. 1) No. 2 injector connector.
c. Check harness between B-16X (terminal No. 4)
engine control relay connector and B-04 (terminal
No. 1) No. 3 injector connector.
d. Check harness between B-16X (terminal No. 4)
engine control relay connector and B-05 (terminal
No. 1) No. 4 injector connector.
• Check power supply line for damage.
Q: Are the check results normal?
YES : Go to Step 11 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-106 TROUBLESHOOTING

STEP 11. Check harness between injector Connector: C-122

connector and C-123 engine-ECU <M/T> <L. H. drive vehicles>
connector or C-122 engine-A/T-ECU <A/T>
connector.
Connector: B-02, B-03, B-04, B-05

B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR) C-122 (GR)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AB

C-122 (GR)
Connector: C-123
<L. H. drive vehicles> 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

a. Check harness between B-02 (terminal No. 2)

C-123 (Y) No. 1injector connector and C-123 (terminal No.
1) engine-ECU <M/T> connector or C-122
<R. H. drive vehicles> (terminal No. 1) engine-A/T-ECU <A/T>
connector.
b. Check harness between B-03 (terminal No. 2)
No. 2 injector connector and C-123 (terminal No.
14) engine-ECU <M/T> connector or C-122
(terminal No. 9) engine-A/T-ECU <A/T>
C-123 (Y) connector.
c. Check harness between B-04 (terminal No. 2)
No. 3 injector connector and C-123 (terminal No.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
2) engine-ECU <M/T> connector or C-122
Harness side connector (terminal No. 24) engine-A/T-ECU <A/T>
AK301122 AB connector.
d. Check harness between B-05 (terminal No. 2)
No. 4 injector connector and C-123 (terminal No.
15) engine-ECU <M/T> connector or C-122
(terminal No. 2) engine-A/T-ECU <A/T>
connector.
Q: Are the check results normal?
YES : Go to Step 12 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-107
STEP 12. Check purge control solenoid valve STEP 13. Fuel pressure measurement.
itself. • Fuel pressure measurement (Refer to
• Check purge control solenoid valve itself (Refer P.13A-384).
to GROUP 17 − Emission Control System − Q: Is the check result normal?
Evaporative Emission Control System P.17-12). YES : Replace engine-ECU <M/T> or
Q: Is the check result normal? engine-A/T-ECU <A/T>.
YES : Go to Step 13 . NO : Repair.
NO : Replace purge control solenoid valve.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-108 TROUBLESHOOTING

Code No. P0201: No. 1 Injector System

Injector circuit

Battery

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4

4 3

R-Y

R-Y R-Y R-Y R-Y

Injector Injector Injector Injector

No.1 1 No.2 1 No.3 1 No.4 1
B-02 B-03 B-04 B-05
(MU802062) (MU802062) (MU802062) (MU802062)

1 2 1 2 1 2 1 2

2 2 2 2

O W-R G R

14 (*1) or 2 (*1) or 15 (*1) or

1 9 (*2) 24 (*2) 2 (*2)

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

C-123 (*1) C-122 (*2)

(MU801824) (MU803784)
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9 10 11 12 13 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
14 15 16 17 18 19 20 21 22 23 24 25 26 24 25 26 27 28 29 30 3132 33 34 35

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301130 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-109
OPERATION STEP 2. Connector check: B-02 No. 1 injector
• Power is supplied to the injector (terminal No. 1) connector
from the engine control relay (terminal No. 4).
• The engine-ECU (terminal No. 1) <M/T> or Connector: B-02
engine-A/T-ECU (terminal No. 1) <A/T> makes
B-02 (GR)
the power transistor in the unit be in "ON"
position, and that makes currents go on the
injector (terminal No. 2).

FUNCTION
M
• The engine-ECU <M/T> or engine-A/T-ECU 2 1
<A/T> controls the power supply interval of the Harness side
injector. connector
AK301120 AC
• The fuel injection amount of the injector depends
on the power supply interval. Q: Is the check result normal?
YES : Go to Step 3 .
TROUBLE JUDGMENT NO : Repair or replace.

Check Conditions
• The engine speed is 50 − 1,000 r/min. STEP 3. Perform resistance measurement at B-02
• The throttle position sensor output voltage is 1.15 No. 1 injector connector.
V or less. Connector: B-02
• Injector not in forced drive (actuator test) mode
B-02 (GR)
Judgment Criterion
• No surge voltage of the injector coil is detected
for 2 seconds.

PROBABLE CAUSE
M
• Failed No. 1 injector 2 1
• Open/short circuit in injector circuit or loose Harness side
connector contact connector
AK301120 AC
• Failed engine-ECU <M/T> • Disconnect connector, and measure at injector
• Failed engine-A/T-ECU <A/T> side.
• Resistance between terminal No. 1 and No. 2.
DIAGNOSIS PROCEDURE
OK: 13 − 16 Ω
Q: Is the check result normal?
STEP 1. MUT-II/III actuator test YES : Go to Step 4 .
• Refer to actuator test reference table P.13A-367. NO : Replace No. 1 injector.
a. Item 01: No. 1 injector
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Go to Step 2 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-110 TROUBLESHOOTING

YES : Check and repair harness between B-16X

STEP 4. Perform voltage measurement at B-02
(terminal No. 4) engine control relay
No. 1 injector connector.
connector and B-02 (terminal No. 1) No. 1
Connector: B-02 injector connector.
• Check power supply line for
B-02 (GR)
open/short circuit.
NO : Repair or replace.

STEP 6. Connector check: B-16X engine control

M relay connector
2 1
Harness side Connector: B-16X
connector B-16X
AK301120 AC
Relay box’s
• Disconnect connector, and measure at harness triangle marks
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth. 2 1
OK: System voltage 4 3
Q: Is the check result normal? Harness side
YES : Go to Step 6 . connector AK301121 AB
NO : Go to Step 5 .
Q: Is the check result normal?
YES : Go to Step 7 .
STEP 5. Connector check: B-16X engine control NO : Repair or replace.
relay connector
Connector: B-16X STEP 7. Check harness between B-16X (terminal
B-16X
No. 4) engine control relay connector and B-02
Relay box’s (terminal No. 1) No. 1 injector connector.
triangle marks
Connector: B-16X
B-16X
2 1 Relay box’s
triangle marks
4 3
Harness side
connector AK301121 AB
2 1

Connector: B-02 4 3
Harness side
B-02 (GR) connector AK301121 AB

Connector: B-02

B-02 (GR)
M
2 1
Harness side
connector
AK301120 AC

M
Q: Is the check result normal? 2 1
Harness side
connector
AK301120 AC

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 8 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-111
STEP 8. Connector check: C-123 engine-ECU STEP 9. Check harness between B-02 (terminal
<M/T> connector or C-122 engine-A/T-ECU <A/T> No. 2) No.1 injector connector and C-123
connector (terminal No. 1) engine-ECU <M/T> connector or
Connector: C-123
C-122 (terminal No. 1) engine-A/T-ECU <A/T>
<L. H. drive vehicles>
connector.
Connector: B-02

B-02 (GR)

C-123 (Y)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AC

Connector: C-123
<L. H. drive vehicles>
C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector C-123 (Y)
AK301122 AB

Connector: C-122 <R. H. drive vehicles>

<L. H. drive vehicles>

C-122 (GR) C-123 (Y)

<R. H. drive vehicles> 13 12 11 10 9 8 7 6 5 4 3 2 1

26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-112 TROUBLESHOOTING

Connector: C-122 Connector: C-122

<L. H. drive vehicles> <L. H. drive vehicles>

C-122 (GR) C-122 (GR)

<R. H. drive vehicles> <R. H. drive vehicles>

C-122 (GR) C-122 (GR)

77 76 75 74 73 72 71 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 100 99 98 97 96 95 94 93 92 91
Harness side connector Harness side connector
AK301123 AB AK301123 AB

• Check output line for open/short circuit and • Engine: Idling

damage. • Transmission : Neutral<M/T> or P range<A/T>
Q: Is the check result normal?
• Voltage between terminal No. 1 and earth.
YES : Go to Step 10 . OK: Waveforms should be display on
NO : Repair. Inspection procedure using an oscilloscope
(Refer to P.13A-375).
STEP 10. Perform signal wavepattern Q: Is the check result normal?
measurement at C-123 engine-ECU <M/T> YES : Intermittent malfunction (Refer to GROUP
connector or C-122 engine-A/T-ECU <A/T> 00 − How to Use Troubleshooting/Inspection
connector (Using oscilloscope). Service Points P.00-6).
NO : Replace engine-ECU <M/T> or
Connector: C-123
engine-A/T-ECU <A/T>.
<L. H. drive vehicles>

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-113

Code No. P0202: No. 2 Injector System

Injector circuit

Battery

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4

4 3

R-Y

R-Y R-Y R-Y R-Y

Injector Injector Injector Injector

No.1 1 No.2 1 No.3 1 No.4 1
B-02 B-03 B-04 B-05
(MU802062) (MU802062) (MU802062) (MU802062)

1 2 1 2 1 2 1 2

2 2 2 2

O W-R G R

14 (*1) or 2 (*1) or 15 (*1) or

1 9 (*2) 24 (*2) 2 (*2)

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

C-123 (*1) C-122 (*2)

(MU801824) (MU803784)
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9 10 11 12 13 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
14 15 16 17 18 19 20 21 22 23 24 25 26 24 25 26 27 28 29 30 3132 33 34 35

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301130 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-114 TROUBLESHOOTING

OPERATION STEP 2. Connector check: B-03 No. 2 injector

• Power is supplied to the injector (terminal No. 1) connector
from the engine control relay (terminal No. 4).
• The engine-ECU (terminal No. 14) <M/T> or Connector: B-03
engine-A/T-ECU (terminal No. 9) <A/T> makes
B-03 (GR)
the power transistor in the unit be in "ON"
position, and that makes currents go on the
injector (terminal No. 2).

FUNCTION
M
• The engine-ECU <M/T> or engine-A/T-ECU 2 1
<A/T> controls the power supply interval of the Harness side
injector. connector
AK301120 AD
• The fuel injection amount of the injector depends
on the power supply interval. Q: Is the check result normal?
YES : Go to Step 3 .
TROUBLE JUDGMENT NO : Repair or replace.

Check Conditions
• The engine speed is 50 − 1,000 r/mim. STEP 3. Measure at resistance B-03 No. 2 injector
• The throttle position sensor output voltage 1.15 V connector.
or less. Connector: B-03
• Injector not in forced drive (actuator test) mode
B-03 (GR)
Judgment Criterion
• No surge voltage of the injector coil is detected
for 2 seconds.

PROBABLE CAUSE
M
• Failed No. 2 injector 2 1
• Open/short circuit in No. 2 injector circuit or loose Harness side
connector contact connector
AK301120 AD
• Failed engine-ECU <M/T> • Disconnect connector, and measure at injector
• Failed engine-A/T-ECU <A/T> side.
• Resistance between terminal No. 1 and No. 2.
DIAGNOSIS PROCEDURE
OK: 13 − 16 Ω
Q: Is the check result normal?
STEP 1. MUT-II/III actuator test YES : Go to Step 4 .
• Refer to actuator test reference table P.13A-367. NO : Replace No. 2 injector.
a. Item 02: No. 2 injector
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Go to Step 2 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-115
YES : Check and repair harness between B-16X
STEP 4. Perform voltage measurement at B-03
(terminal No. 4) engine control relay
No. 2 injector connector.
connector and B-03 (terminal No. 1) No. 2
Connector: B-03 injector connector.
• Check power supply line for
B-03 (GR)
open/short circuit and damage.
NO : Repair or replace.

STEP 6. Connector check: B-16X engine control

M relay connector
2 1
Harness side Connector: B-16X
connector B-16X
AK301120 AD
Relay box’s
• Disconnect connector, and measure at harness triangle marks
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth. 2 1
OK: System voltage 4 3
Q: Is the check result normal? Harness side
YES : Go to Step 6 . connector AK301121 AB
NO : Go to Step 5 .
Q: Is the check result normal?
YES : Go to Step 7 .
STEP 5. Connector check: B-16X engine control NO : Repair or replace.
relay connector
Connector: B-16X STEP 7. Check harness between B-16X (terminal
B-16X
No. 4) engine control relay connector and B-03
Relay box’s (terminal No. 1) No. 2 injector connector.
triangle marks
Connector: B-16X
B-16X
2 1 Relay box’s
triangle marks
4 3
Harness side
connector AK301121 AB
2 1

Connector: B-03 4 3
Harness side
B-03 (GR) connector AK301121 AB

Connector: B-03

B-03 (GR)
M
2 1
Harness side
connector
AK301120 AD

M
Q: Is the check result normal? 2 1
Harness side
connector
AK301120 AD

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 8 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-116 TROUBLESHOOTING

STEP 8. Connector check: C-123 engine-ECU STEP 9. Check harness between B-03 (terminal
<M/T> connector or C-122 engine-A/T-ECU <A/T> No. 2) No. 2 injector connector and C-123
connector (terminal No. 14) engine-ECU <M/T> connector or
Connector: C-123
C-122 engine-A/T-ECU <A/T> connector.
<L. H. drive vehicles> Connector: B-03

B-03 (GR)

C-123 (Y)

M
<R. H. drive vehicles> 2 1
Harness side
connector
AK301120 AD

Connector: C-123
<L. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14 C-123 (Y)
Harness side connector
AK301122 AB
<R. H. drive vehicles>
Connector: C-122
<L. H. drive vehicles>

C-123 (Y)
C-122 (GR)

13 12 11 10 9 8 7 6 5 4 3 2 1
<R. H. drive vehicles> 26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-117

Connector: C-122 Connector: C-122

<L. H. drive vehicles> <L. H. drive vehicles>

C-122 (GR) C-122 (GR)

<R. H. drive vehicles> <R. H. drive vehicles>

C-122 (GR) C-122 (GR)

77 76 75 74 73 72 71 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 100 99 98 97 96 95 94 93 92 91
Harness side connector Harness side connector
AK301123 AB AK301123 AB

• Check output line for open/short circuit and • Engine: Idling

damage. • Transmission : Neutral<M/T> or P range<A/T>
Q: Is the check result normal?
• Voltage between terminal No. 14 <M/T> or
YES : Go to Step 10 . terminal No. 9 <A/T> and earth.
NO : Repair. OK: Waveform should be display on
Inspection procedure using an oscilloscope
(Refer to P.13A-375).
STEP 10. Perform signal wavepattern
measurement at C-123 engine-ECU <M/T> Q: Is the check result normal?
connector or C-122 engine-A/T-ECU <A/T> YES : Intermittent malfunction (Refer to GROUP
connector (Using oscilloscope). 00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
Connector: C-123
NO : Replace engine-ECU <M/T> or
<L. H. drive vehicles>
engine-A/T-ECU <A/T>.

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-118 TROUBLESHOOTING

Code No. P0203: No. 3 Injector System

Injector circuit

Battery

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4

4 3

R-Y

R-Y R-Y R-Y R-Y

Injector Injector Injector Injector

No.1 1 No.2 1 No.3 1 No.4 1
B-02 B-03 B-04 B-05
(MU802062) (MU802062) (MU802062) (MU802062)

1 2 1 2 1 2 1 2

2 2 2 2

O W-R G R

14 (*1) or 2 (*1) or 15 (*1) or

1 9 (*2) 24 (*2) 2 (*2)

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

C-123 (*1) C-122 (*2)

(MU801824) (MU803784)
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9 10 11 12 13 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
14 15 16 17 18 19 20 21 22 23 24 25 26 24 25 26 27 28 29 30 3132 33 34 35

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301130 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-119
OPERATION DIAGNOSIS PROCEDURE
• Power is supplied to the injector (terminal No. 1)
from the engine control relay (terminal No. 4).
• The engine-ECU (terminal No. 2) <M/T> or STEP 1. MUT-II/III actuator test
engine-A/T-ECU (terminal No. 24) <A/T> makes • Refer to actuator test reference table P.13A-367.
the power transistor in the unit be in "ON" a. Item 03: No. 3 injector
position, and that makes currents go on the OK: Idling state varies.
injector (terminal No. 2). Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
FUNCTION
00 − How to Use Troubleshooting/Inspection
• The engine-ECU <M/T> or engine-A/T-ECU
Service Points P.00-6).
<A/T> controls the power supply interval of the NO : Go to Step 2 .
injector.
• The fuel injection amount of the injector depends
on the power supply interval. STEP 2. Connector check: B-04 No. 3 injector
connector
TROUBLE JUDGMENT
Connector: B-04
Check Conditions
B-04 (GR)
• The engine speed is 50 − 1,000 r/mim.
• The throttle position sensor output voltage is 1.15
V or less.
• Injector not in forced drive (actuator test) mode
Judgment Criterion M
• No surge voltage of the injector coil is detected 2 1
Harness side
for 2 seconds. connector
AK301120 AE

PROBABLE CAUSE
Q: Is the check result normal?
• Failed No. 3 injector YES : Go to Step 3 .
• Open/short circuit in No. 3 injector circuit or loose NO : Repair or replace.
connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T> STEP 3. Perform resistance measurement at B-04
No. 3 injector connector.
Connector: B-04
B-04 (GR)

M
2 1
Harness side
connector
AK301120 AE

• Disconnect connector, and measure at injector

side.
• Resistance between terminal No. 1 and No. 2.
OK: 13 − 16 Ω
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace No. 3 injector.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-120 TROUBLESHOOTING

YES : Check and repair harness between B-16X

STEP 4. Perform voltage measurement at B-04
(terminal No. 4) engine control relay
No. 3 injector connector.
connector and B-04 (terminal No. 1) No. 3
Connector: B-04 injector connector.
B-04 (GR)
• Check power supply line for
open/short circuit.
NO : Repair or replace.

STEP 6. Connector check: B-16X engine control

M relay connector
2 1
Harness side Connector: B-16X
connector B-16X
AK301120 AE
Relay box’s
• Disconnect connector, and measure at harness triangle marks
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth. 2 1
OK: System voltage 4 3
Q: Is the check result normal? Harness side
YES : Go to Step 6 . connector AK301121 AB
NO : Go to Step 5 .
Q: Is the check result normal?
YES : Go to Step 7 .
STEP 5. Connector check: B-16X engine control NO : Repair or replace.
relay connector
Connector: B-16X STEP 7. Check harness between B-16X (terminal
B-16X
No. 4) engine control relay connector and B-04
Relay box’s (terminal No. 1) No. 3 injector connector.
triangle marks
Connector: B-16X
B-16X
2 1 Relay box’s
triangle marks
4 3
Harness side
connector AK301121 AB
2 1

Connector: B-04 4 3
Harness side
B-04 (GR) connector AK301121 AB

Connector: B-04
B-04 (GR)
M
2 1
Harness side
connector
AK301120 AE

M
Q: Is the check result normal? 2 1
Harness side
connector
AK301120 AE

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 8 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-121
STEP 8. Connector check: C-123 engine-ECU STEP 9. Check harness between B-04 (terminal
<M/T> connector or C-122 engine-A/T-ECU <A/T> No. 2) No. 3 injector connector and C-123
connector (terminal No. 2) engine-ECU <M/T> connector or
Connector: C-123
C-122 (terminal No. 24) engine-A/T-ECU <A/T>
<L. H. drive vehicles>
connector.
Connector: B-04
B-04 (GR)

C-123 (Y)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AE

Connector: C-123
<L. H. drive vehicles>
C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector C-123 (Y)
AK301122 AB

Connector: C-122 <R. H. drive vehicles>

<L. H. drive vehicles>

C-122 (GR) C-123 (Y)

<R. H. drive vehicles> 13 12 11 10 9 8 7 6 5 4 3 2 1

26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-122 TROUBLESHOOTING

Connector: C-122 Connector: C-122

<L. H. drive vehicles> <L. H. drive vehicles>

C-122 (GR) C-122 (GR)

<R. H. drive vehicles> <R. H. drive vehicles>

C-122 (GR) C-122 (GR)

77 76 75 74 73 72 71 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 100 99 98 97 96 95 94 93 92 91
Harness side connector Harness side connector
AK301123 AB AK301123 AB

• Check output line for open/short circuit and • Engine: Idling

damage. • Transmission : Neutral<M/T> or P range<A/T>
Q: Is the check result normal?
• Voltage between terminal No. 2 <M/T> or
YES : Go to Step 10 . terminal No. 24 <A/T> and earth.
NO : Repair. OK: Waveform should be displayed on
Inspection procedure using an oscilloscope
(Refer to P.13A-375).
STEP 10. Perform signal wavepattern
measurement at C-123 engine-ECU <M/T> Q: Is the check result normal?
connector or C-122 engine-A/T-ECU <A/T> YES : Intermittent malfunction (Refer to GROUP
connector (Using oscilloscope). 00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
Connector: C-123
NO : Replace engine-ECU <M/T> or
<L. H. drive vehicles>
engine-A/T-ECU <A/T>.

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-123

Code No. P0204: No. 4 Injector System

Injector circuit

Battery

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4

4 3

R-Y

R-Y R-Y R-Y R-Y

Injector Injector Injector Injector

No.1 1 No.2 1 No.3 1 No.4 1
B-02 B-03 B-04 B-05
(MU802062) (MU802062) (MU802062) (MU802062)

1 2 1 2 1 2 1 2

2 2 2 2

O W-R G R

14 (*1) or 2 (*1) or 15 (*1) or

1 9 (*2) 24 (*2) 2 (*2)

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

C-123 (*1) C-122 (*2)

(MU801824) (MU803784)
1 2 3 4 5 6 7 8
1 2 3 4 5 6 7 8 9 10 11 12 13 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
14 15 16 17 18 19 20 21 22 23 24 25 26 24 25 26 27 28 29 30 3132 33 34 35

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301130 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-124 TROUBLESHOOTING

OPERATION STEP 2. Connector check: B-05 No. 4 injector

• Power is supplied to the injector (terminal No. 1) connector
from the engine control relay (terminal No. 4).
• The engine-ECU (terminal No. 15) <M/T> or Connector: B-05
engine-A/T-ECU (terminal No. 2) <A/T> makes B-05 (GR)
the power transistor in the unit be in "ON"
position, and that makes currents go on the
injector (terminal No. 2).

FUNCTION
M
• The engine-ECU <M/T> or engine-A/T-ECU 2 1
<A/T> controls the power supply interval of the Harness side
injector. connector
AK301120 AF
• The fuel injection amount of the injector depends
on the power supply interval. Q: Is the check result normal?
YES : Go to Step 3 .
TROUBLE JUDGMENT NO : Repair or replace.

Check Conditions
• The engine speed is 50 − 1,000 r/mim. STEP 3. Perform resistance measurement at B-05
• The throttle position sensor output 1.15 V or less. No. 4 injector connector.
• Injector not in forced drive (actuator test) mode Connector: B-05
Judgment Criterion B-05 (GR)
• No surge voltage of the injector coil is detected
for 2 seconds

PROBABLE CAUSE
• Failed No. 4 injector
M
• Open/short circuit in No. 4 injector circuit or loose 2 1
connector contact Harness side
• Failed engine-ECU <M/T> connector
AK301120 AF
• Failed engine-A/T-ECU <A/T> • Disconnect connector, and measure at injector
side.
DIAGNOSIS PROCEDURE • Resistance between terminal No. 1 and No. 2.
OK: 13 − 16 Ω
STEP 1. MUT-II/III actuator test Q: Is the check result normal?
• Refer to actuator test reference table P.13A-367. YES : Go to Step 4 .
a. Item 04: No. 4 injector NO : Replace No. 4 injector.
OK: Idling state varies.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Go to Step 2 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-125
YES : Check and repair harness between B-16X
STEP 4. Perform voltage measurement at B-05
(terminal No. 1) engine control relay
No. 4 injector connector.
connector and B-05 (terminal No. 1) No. 4
Connector: B-05 injector connector.
• Check power supply line for
B-05 (GR)
open/short circuit and damage.
NO : Repair or replace.

STEP 6. Connector check: B-16X engine control

M relay connector
2 1
Harness side Connector: B-16X
connector B-16X
AK301120 AF
Relay box’s
• Disconnect connector, and measure at harness triangle marks
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth. 2 1
OK: System voltage 4 3
Q: Is the check result normal? Harness side
YES : Go to Step 6 . connector AK301121 AB
NO : Go to Step 5 .
Q: Is the check result normal?
YES : Go to Step 7.
STEP 5. Connector check: B-16X engine control NO : Repair or replace.
relay connector
Connector: B-16X STEP 7. Check harness between B-16X (terminal
B-16X
No. 4) engine control relay connector and B-05
Relay box’s (terminal No. 1) No. 4 injector connector.
triangle marks
Connector: B-16X
B-16X
2 1 Relay box’s
triangle marks
4 3
Harness side
connector AK301121 AB
2 1

Connector: B-05 4 3
Harness side
B-05 (GR) connector AK301121 AB

Connector: B-05

B-05 (GR)
M
2 1
Harness side
connector
AK301120 AF

M
Q: Is the check result normal? 2 1
Harness side
connector
AK301120 AF

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 8 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-126 TROUBLESHOOTING

STEP 8. Connector check: C-123 engine-ECU STEP 9. Check harness between B-05 (terminal
<M/T> connector or C-122 engine-A/T-ECU <A/T> No. 2) No. 4 injector connector and C-123
connector (terminal No. 15) engine-ECU <M/T> connector or
Connector: C-123
C-122 (terminal No. 2) engine-A/T-ECU <A/T>
<L. H. drive vehicles>
connector.
Connector: B-05

B-05 (GR)

C-123 (Y)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AF

Connector: C-123
<L. H. drive vehicles>
C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector C-123 (Y)
AK301122 AB

Connector: C-122 <R. H. drive vehicles>

<L. H. drive vehicles>

C-122 (GR) C-123 (Y)

<R. H. drive vehicles> 13 12 11 10 9 8 7 6 5 4 3 2 1

26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-127

Connector: C-122 Connector: C-122

<L. H. drive vehicles> <L. H. drive vehicles>

C-122 (GR) C-122 (GR)

<R. H. drive vehicles> <R. H. drive vehicles>

C-122 (GR) C-122 (GR)

77 76 75 74 73 72 71 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 100 99 98 97 96 95 94 93 92 91
Harness side connector Harness side connector
AK301123 AB AK301123 AB

• Check output line for open/short circuit and • Engine: Idling

damage. • Transmission : Neutral<M/T> or P range<A/T>
Q: Is the check result normal?
• Voltage between terminal No. 15 <M/T> or
YES : Go to Step 10 . terminal No. 2 <A/T> and earth.
NO : Repair. OK: Waveform should be displayed on
Inspection procedure using an oscilloscope
(Refer to P.13A-375).
STEP 10. Perform signal wavepattern
measurement at C-123 engine-ECU <M/T> Q: Is the check result normal?
connector or C-122 engine-A/T-ECU <A/T> YES : Intermittent malfunction (Refer to GROUP
connector (Using oscilloscope). 00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
Connector: C-123
NO : Replace engine-ECU <M/T> or
<L. H. drive vehicles>
engine-A/T-ECU <A/T>.

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-128 TROUBLESHOOTING

Code No. P0300: Random Cylinder Misfire Detected

OPERATION • Failed crank angle sensor

• Refer to P0201 injector circuit P.13A-108. • Incorrect air-fuel ratio
• Refer to P0202 injector circuit P.13A-113. • Low compression pressure
• Refer to P0203 injector circuit P.13A-118. • Failed coolant temperature sensor
• Refer to P0204 injector circuit P.13A-123. • Skipping of timing belt teeth.
• EGR system and EGR valve failed
FUNCTION • Failed engine-ECU <M/T>
• If a misfire occurs while the engine is running, the • Failed engine-A/T-ECU <A/T>
engine speed changes for an instant.
• The engine-ECU <M/T> or engine-A/T-ECU DIAGNOSIS PROCEDURE
<A/T> checks for such changes in engine speed.

TROUBLE JUDGMENT STEP 1. MUT-II/III data list

• Refer to data list reference table P.13A-361.
Check Conditions
a. Item 22: Crank angle sensor
• 5 seconds later after the engine has started up.
• The engine speed is 500 − 4,500 r/min. OK: Keep the engine speed constant to
• The engine coolant temperature is −10°C or make the pulse width of output waveform
higher. constant.
• The intake air temperature is −10°C or higher. Q: Is the check result normal?
• The barometric pressure is 72 kPa or more. YES : Go to Step 2 .
• The volumetric efficiency is 30 − 60%. NO : Check crank angle sensor system (Refer to
• The adaptive learning has been completed with Code No. P0335 P.13A-149).
the vane that generates the crankshaft position
signals.
STEP 2. MUT-II/III data list
• During the engine operation except the shift
• Refer to data list reference table P.13A-361.
change or low speed driving and rapid
a. Item 21: Engine coolant temperature sensor
acceleration and deceleration, also intermittent
b. Item 81: Long-term fuel compensation
operation of air compressor (A/C: within the 3
c. Item 82: Short-term fuel compensation
seconds after changing to ON from OFF or to
OFF from ON). Q: Are the check results normal?
• The throttle deviation is within the range of YES : Go to Step 3 .
−0.059 V/10ms to 0.059 V/10ms. NO : Perform the diagnosis code classified check
procedure for the sensor that has shown an
Judgment Criteria abnormal data valve (Refer to, Inspection
• The number of misfiring (in the catalyst Chart for diagnosis codes P.13A-16).
temperature of above 950°C) is beyond the
specified number (of 7.3% on more than the two
cylinders) with the engine speed of 200 r/min. STEP 3. Check ignition coil spark.
or Q: Is the check result normal?
• The number of misfiring (that is 1.5 times the YES : Go to Step 4 .
emission standard limit) is beyond the specified NO : Check ignition circuit system (Refer to
number (of 2% on more than the two cylinders) Inspection procedure 28 <L.H. drive
with the engine speed of 1000 r/min. vehicles> P.13A-346 or Inspection
procedure 29 <R.H. drive vehicles>
PROBABLE CAUSE P.13A-353).
• Ignition system related part(s) failed
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-129
STEP 4. Connector check: Injector connector STEP 6. Connector check: B-16X engine control
relay connector and C-123 engine-ECU
Connector: B-02, B-03, B-04, B-05
connector <M/T> connector or C-122
B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR) engine-A/T-ECU <A/T>
Connector: B-16X
B-16X
Relay box’s
triangle marks
M
2 1
Harness side
connector 2 1
AK301120 AB
4 3
a. B-02 (No.1 injector connector)
b. B-03 (No.2 injector connector) Harness side
connector AK301121 AB
c. B-04 (No.3 injector connector)
d. B-05 (No.4 injector connector) Connector: C-123
Q: Are the check results normal? <L. H. drive vehicles>
YES : Go to Step 5 .
NO : Repair or replace.

STEP 5. Check injector itself.

C-123 (Y)
• Check Injector itself (Refer to P.13A-393).
Q: Is the check result normal?
<R. H. drive vehicles>
YES : Go to Step 6 .
NO : Replace injector.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-130 TROUBLESHOOTING

Connector: C-122 STEP 7. Check harness between B-16X engine

<L. H. drive vehicles> control relay connector and injector connector.
Connector: B-16X
B-16X
Relay box’s
triangle marks
C-122 (GR)

2 1
<R. H. drive vehicles>
4 3
Harness side
connector AK301121 AB

Connector: B-02, B-03, B-04, B-05

C-122 (GR) B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR)
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
M
Q: Is the check result normal? 2 1
Harness side
YES : Go to Step 7 . connector
AK301120 AB
NO : Repair or replace.
a. Check harness between B-16X (terminal No. 1)
engine control relay connector and B-02 (terminal
No. 1) No. 1 injector connector.
b. Check harness between B-16X (terminal No. 1)
engine control relay connector and B-03 (terminal
No. 1) No. 2 injector connector.
c. Check harness between B-16X (terminal No. 1)
engine control relay connector and B-04 (terminal
No. 1) No. 3 injector connector.
d. Check harness between B-16X (terminal No. 1)
engine control relay connector and B-05 (terminal
No. 1) No. 4 injector connector.
• Check power supply line for damage.
Q: Are the check results normal?
YES : Go to Step 8 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-131
STEP 8. Check harness between injector Connector: C-122
connector and C-123 engine-ECU <M/T> <L. H. drive vehicles>
connector or C-122 engine-A/T-ECU <A/T>
connector.
Connector: B-02, B-03, B-04, B-05

B-02 (GR) B-03 (GR) B-04 (GR) B-05 (GR) C-122 (GR)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AB

C-122 (GR)
Connector: C-123
<L. H. drive vehicles> 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

a. Check harness between B-02 (terminal No. 2)

C-123 (Y) No. 1injector connector and C-123 (terminal No.
1) engine-ECU <M/T> connector or C-122
<R. H. drive vehicles> (terminal No. 1) engine-A/T-ECU <A/T>
connector.
b. Check harness between B-03 (terminal No. 2)
No. 2 injector connector and C-123 (terminal No.
14) engine-ECU <M/T> connector or C-122
(terminal No. 9) engine-A/T-ECU <A/T>
C-123 (Y) connector.
c. Check harness between B-04 (terminal No. 2)
No. 3 injector connector and C-123 (terminal No.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
2) engine-ECU <M/T> connector or C-122
Harness side connector (terminal No. 24) engine-A/T-ECU <A/T>
AK301122 AB connector.
d. Check harness between B-05 (terminal No. 2)
No. 4 injector connector and C-123 (terminal No.
15) engine-ECU <M/T> connector or C-122
(terminal No. 2) engine-A/T-ECU <A/T>
connector.
• Check output line for damage.
Q: Are the check results normal?
YES : Go to Step 9 .
NO : Repair.

STEP 9. Fuel pressure measurement.

• Fuel pressure measurement (Refer to fuel
pressure test P.13A-384)
Q: Is the check result normal?
YES : Go to Step 10 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-132 TROUBLESHOOTING

STEP 10. Check for intake of air from intake hose STEP 12. Exhaust gas recirculation system
and inlet manifold. check.
Q: Is the check result normal?
• Exhaust gas recirculation system check [Refer to
YES : Go to Step 11 . GROUP 17 − Exhaust gas recirculation (EGR)
NO : Repair. system P.17-16].
Q: Is the check result normal?
STEP 11. Check for skipped timing belt teeth. YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
Q: Is the check result normal? NO : Repair.
YES : Go to Step 12 .
NO : Repair.

Code No. P0301: No. 1 Cylinder Misfire Detection System

OPERATION Judgment Criteria

• Refer to P0201 injector circuit P.13A-108. • The number of misfiring (in the catalyst
temperature of above 950°C) is beyond the
FUNCTION specified number (of 7.3% on only No. 1 cylinder)
• If a misfire occurs while the engine is running, the with the engine speed of 200 r/min.
engine speed changes for an instant. or
• The engine-ECU <M/T> or engine-A/T-ECU • The number of misfiring (that is 1.5 times the
<A/T> checks for such changes in engine speed. emission standard limit) is beyond the specified
number (of 2% on only No. 1 cylinder) with the
TROUBLE JUDGMENT
engine speed of 1,000 r/min.
Check Conditions
• 5 seconds later after the engine has started up. PROBABLE CAUSE
• The engine speed is 500 − 4,500 r/min. • Ignition system related part(s) failed
• The intake manifold pressure is 32 kpa or more. • Low compression pressure
• The engine coolant temperature is −10°C or • Failed engine-ECU <M/T>
higher. • Failed engine-A/T-ECU <A/T>
• The intake air temperature is −10°C or higher.
• The barometric pressure is 72 kPa or more. DIAGNOSIS PROCEDURE
• The adaptive learning has been completed with
the vane that generates the crankshaft position STEP 1. Check ignition coil spark.
signals.
• During the engine operation except the shift Q: Is the check result normal?
change or low speed driving and rapid YES : Go to Step 2 .
acceleration and deceleration, also intermittent NO : Check ignition Circuit System (Refer to
operation of air compressor (A/C: within the 3 Inspection procedure 28 <L.H. drive
seconds after changing to ON from OFF or to vehicles> P.13A-346 or Inspection
OFF from ON). procedure 29 <R.H. drive vehicles>
• The throttle deviation is within the range of P.13A-353).
−0.059 V/10ms to 0.059 V/10ms.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-133
STEP 2. Connector check: B-02 No. 1 injector STEP 4. Connector check: B-16X engine control
connector relay connector and C-123 engine-ECU <M/T>
connector or C-122 engine-A/T-ECU <A/T>
Connector: B-02
connector
B-02 (GR)
Connector: B-16X
B-16X
Relay box’s
triangle marks

M
2 1
2 1
Harness side
connector 4 3
AK301120 AC

Harness side
Q: Is the check result normal? connector AK301121 AB
YES : Go to Step 3 .
NO : Repair or replace. Connector: C-123
<L. H. drive vehicles>
STEP 3. Check No. 1 injector itself.
• Check Injector itself (Refer to P.13A-393).
Q: Is the check result normal?
YES : Go to Step 4 . C-123 (Y)
NO : Replace No. 1 injector.

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-134 TROUBLESHOOTING

Connector: C-122 STEP 5. Check harness between B-16X (terminal

<L. H. drive vehicles> No. 4) engine control relay connector and B-02
(terminal No. 1) No. 1 injector connector.
Connector: B-16X
B-16X
Relay box’s
C-122 (GR) triangle marks

<R. H. drive vehicles>

2 1
4 3
Harness side
connector AK301121 AB

C-122 (GR) Connector: B-02

77 76 75 74 73 72 71 B-02 (GR)
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal? M

YES : Go to Step 5 . 2 1
Harness side
NO : Repair or replace. connector
AK301120 AC

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 6 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-135
STEP 6. Check harness between B-02 (terminal Connector: C-122
No. 2) No.1 injector connector and C-123 <L. H. drive vehicles>
(terminal No. 1) engine-ECU <M/T> connector or
C-122 (terminal No. 1) engine-A/T-ECU <A/T>
connector
Connector: B-02
C-122 (GR)
B-02 (GR)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AC C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check output line for damage.

C-123 (Y) Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair.
<R. H. drive vehicles>

STEP 7. Fuel pressure measurement.

• Fuel pressure measurement (Refer to fuel
pressure test P.13A-384).
Q: Is the check result normal?
C-123 (Y) YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Repair.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-136 TROUBLESHOOTING

Code No. P0302: No. 2 Cylinder Misfire Detection System

OPERATION PROBABLE CAUSE

• Refer to P0202 injector circuit P.13A-113. • Ignition system related part(s) failed
• Low compression pressure
FUNCTION • Failed engine-ECU <M/T>
• If a misfire occurs while the engine is running, the • Failed engine-A/T-ECU <A/T>
engine speed changes for an instant.
• The engine-ECU <M/T> or engine-A/T-ECU DIAGNOSIS PROCEDURE
<A/T> checks for such changes in engine speed.

TROUBLE JUDGMENT STEP 1. Check ignition coil spark.

Check Conditions Q: Is the check result normal?
• 5 seconds later after the engine has started up. YES : Go to Step 2 .
• The engine speed is 500 − 4,500 r/min. NO : Check ignition circuit system (Refer to
• The intake manifold pressure is 32 kPa or more. Inspection procedure 28 <L.H. drive
• The engine coolant temperature is −10°C or vehicles> P.13A-346 or Inspection
higher. procedure 29 <R.H. drive vehicles>
• The intake air temperature is −10°C or higher. P.13A-353).
• The barometric pressure is 72 kPa or more.
• The adaptive learning has been completed with STEP 2. Check connector: B-03 No. 2 injector
the vane that generates the crankshaft position connector
signals.
• During the engine operation except the shift Connector: B-03
change or low speed driving and rapid B-03 (GR)
acceleration and deceleration, also intermittent
operation of air compressor (A/C: within the 3
seconds after changing to ON from OFF or to
OFF from ON).
• The throttle deviation is within the range of − M
0.059 V/10ms to 0.059 V/10ms. 2 1
Harness side
Judgment Criteria connector
AK301120 AD
• The number of misfiring (in the catalyst
temperature of above 950°C) is beyond the Q: Is the check result normal?
specified number (of 7.3% on only No. 2 cylinder) YES : Go to Step 3 .
with the engine speed of 200 r/min. NO : Repair or replace.
or
• The number of misfiring (that is 1.5 times the STEP 3. Check No. 2 injector itself.
emission standard limit) is beyond the specified • Check Injector itself (Refer to P.13A-393).
number (of 2% on only No. 2 cylinder) with the
engine speed of 1,000 r/min. Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace No. 2 injector.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-137
STEP 4. Connector check: B-16X engine control Connector: C-122
relay connector and C-123 engine-ECU <M/T> <L. H. drive vehicles>
connector or C-122 engine-A/T-ECU <A/T>
connector
Connector: B-16X
B-16X
C-122 (GR)
Relay box’s
triangle marks
<R. H. drive vehicles>

2 1
4 3
Harness side
connector AK301121 AB

C-122 (GR)
Connector: C-123
<L. H. drive vehicles> 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

C-123 (Y) Q: Is the check result normal?

YES : Go to Step 5 .
NO : Repair or replace.
<R. H. drive vehicles>

STEP 5. Check harness between B-16X (terminal

No. 4) engine control relay connector and B-03
(terminal No. 1) No. 2 injector connector.
Connector: B-16X
C-123 (Y) B-16X
Relay box’s
triangle marks
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB 2 1
4 3
Harness side
connector AK301121 AB

Connector: B-02

B-02 (GR)

M
2 1
Harness side
connector
AK301120 AC

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 6 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-138 TROUBLESHOOTING

STEP 6. Check harness between B-03 (terminal Connector: C-122

No. 2) No. 2 injector connector and C-123 <L. H. drive vehicles>
(terminal No. 14) engine-ECU <M/T> connector or
C-122 (terminal No. 9) engine-A/T-ECU <A/T>
connector
Connector: B-02
C-122 (GR)
B-02 (GR)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AC C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check output line for damage.

C-123 (Y) Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair.
<R. H. drive vehicles>

STEP 7. Fuel pressure measurement.

• Fuel pressure measurement (Refer to fuel
pressure test P.13A-384)
Q: Is the check result normal?
C-123 (Y) YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Repair.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-139

Code No. P0303: No. 3 Cylinder Misfire Detection System

OPERATION PROBABLE CAUSE

• Refer to P0203 injector circuit P.13A-118. • Ignition system related part(s) failed
• Low compression pressure
FUNCTION • Failed engine-ECU <M/T>
• If a misfire occurs while the engine is running, the • Failed engine-A/T-ECU <A/T>
engine speed changes for an instant.
• The engine-ECU <M/T> or engine-A/T-ECU DIAGNOSIS PROCEDURE
<A/T> checks for such changes in engine speed.

TROUBLE JUDGMENT STEP 1. Check ignition coil spark.

Check Conditions Q: Is the check result normal?
• 5 seconds later after the engine has started up. YES : Go to Step 2 .
• The engine speed is 500 − 4,500 r/min. NO : Check ignition circuit system (Refer to
• The intake manifold pressure is 32 kPa or more. Inspection procedure 28 <L.H. drive
• The engine coolant temperature is −10°C or vehicles> P.13A-346 or Inspection
higher. procedure 29 <R.H. drive vehicles>
• The intake air temperature is −10°C or higher. P.13A-353).
• The barometric pressure is 72 kPa or more.
• The adaptive learning has been completed with STEP 2. Connector check: B-04 No. 3 injector
the vane that generates the crankshaft position connector
signals.
• During the engine operation except the shift Connector: B-04
change or low speed driving and rapid B-04 (GR)
acceleration and deceleration, also intermittent
operation of air compressor (A/C: within the 3
seconds after changing to ON from OFF or to
OFF from ON).
• The throttle deviation is within the range of − M
0.059 V/10ms to 0.059 V/10ms. 2 1
Harness side
Judgment Criteria connector
AK301120 AE
• The number of misfiring (in the catalyst
temperature of above 950°C) is beyond the Q: Is the check result normal?
specified number (of 7.3% on only No. 3 cylinder) YES : Go to Step 3 .
with the engine speed of 200 r/min. NO : Repair or replace.
or
• The number of misfiring (that is 1.5 times the STEP 3. Check No. 3 injector itself.
emission standard limit) is beyond the specified • Check Injector itself (Refer to P.13A-393).
number (of 2% on only No. 3 cylinder) with the
engine speed of 1,000 r/min. Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace No. 3 injector.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-140 TROUBLESHOOTING

STEP 4. Connector check: B-16X engine control Connector: C-122

relay connector, C-123 engine-ECU connector <L. H. drive vehicles>
<M/T> connector or C-122 engine-A/T-ECU <A/T>
Connector: B-16X
B-16X
Relay box’s
triangle marks C-122 (GR)

<R. H. drive vehicles>

2 1
4 3
Harness side
connector AK301121 AB

Connector: C-123
C-122 (GR)
<L. H. drive vehicles>
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
C-123 (Y)
Q: Is the check result normal?
YES : Go to Step 5 .
<R. H. drive vehicles> NO : Repair or replace.

STEP 5. Check harness between B-16X (terminal

No. 4) engine control relay connector and B-04
(terminal No. 1) No. 3 injector connector.
C-123 (Y) Connector: B-16X
B-16X
Relay box’s
13 12 11 10 9 8 7 6 5 4 3 2 1 triangle marks
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
2 1
4 3
Harness side
connector AK301121 AB

Connector: B-04
B-04 (GR)

M
2 1
Harness side
connector
AK301120 AE

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 6 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-141
STEP 6. Check harness between B-04 (terminal Connector: C-122
No. 2) No.3 injector connector and C-123 <L. H. drive vehicles>
(terminal No. 2) engine-ECU <M/T> connector or
C-122 (terminal No. 24) engine-A/T-ECU <A/T>
connector
Connector: B-04
C-122 (GR)
B-04 (GR)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AE C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check output line for damage.

C-123 (Y) Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair.
<R. H. drive vehicles>

STEP 7. Fuel pressure measurement.

• Fuel pressure measurement (Refer to fuel
pressure test P.13A-384)
Q: Is the check result normal?
C-123 (Y) YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Repair.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-142 TROUBLESHOOTING

Code No. P0304: No. 4 Cylinder Misfire Detection System

OPERATION PROBABLE CAUSE

• Refer to P0204 injector circuit P.13A-123. • Ignition system related part(s) failed
• Low compression pressure
FUNCTION • Failed engine-ECU <M/T>
• If a misfire occurs while the engine is running, the • Failed engine-A/T-ECU <A/T>
engine speed changes for an instant.
• The engine-ECU <M/T> or engine-A/T-ECU DIAGNOSIS PROCEDURE
<A/T> checks for such changes in engine speed.

TROUBLE JUDGMENT STEP 1. Check the ignition coil spark.

Check Conditions Q: Is the check result normal?
• 5 seconds later after the engine has started up. YES : Go to Step 2 .
• The engine speed is 500 − 4,500 r/min. NO : Check ignition Circuit System (Refer to
• The intake manifold pressure is 32 kPa or more. Inspection procedure 28 <L.H. drive
• The engine coolant temperature is −10°C or vehicles> P.13A-346 or Inspection
higher. procedure 29 <R.H. drive vehicles>
• The intake air temperature is −10°C or higher. P.13A-353).
• The barometric pressure is 72 kPa or more.
• The adaptive learning has been completed with STEP 2. Connector check: B-05 No.4 injector
the vane that generates the crankshaft position connector
signals.
• During the engine operation except the shift Connector: B-05
change or low speed driving and rapid B-05 (GR)
acceleration and deceleration, also intermittent
operation of air compressor (A/C: within the 3
seconds after changing to ON from OFF or to
OFF from ON).
• The throttle deviation is within the range of − M
0.059 V/10ms to 0.059 V/10ms. 2 1
Harness side
Judgment Criteria connector
AK301120 AF
• The number of misfiring (in the catalyst
temperature of above 950°C) is beyond the Q: Is the check result normal?
specified number (of 7.3% on only No. 4 cylinder) YES : Go to Step 3 .
with the engine speed of 200 r/min. NO : Repair or replace.
or
• The number of misfiring (that is 1.5 times the STEP 3. Check No. 4 injector itself.
emission standard limit) is beyond the specified • Check Injector itself (Refer to P.13A-393).
number (of 2% on only No. 4 cylinder) with the
engine speed of 1,000 r/min. Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace No. 4 injector.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-143
STEP 4. Connector check: B-16X engine control Connector: C-122
relay connector and C-123 engine-ECU <L. H. drive vehicles>
connector <M/T> connector or C-122
engine-A/T-ECU <A/T>
Connector: B-16X
B-16X
C-122 (GR)
Relay box’s
triangle marks
<R. H. drive vehicles>

2 1
4 3
Harness side
connector AK301121 AB

C-122 (GR)
Connector: C-123
<L. H. drive vehicles> 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

C-123 (Y) Q: Is the check result normal?

YES : Go to Step 5 .
NO : Repair or replace.
<R. H. drive vehicles>

STEP 5. Check harness between B-16X (terminal

No. 4) engine control relay connector and B-05
(terminal No. 1) No. 4 injector connector.
Connector: B-16X
C-123 (Y) B-16X
Relay box’s
triangle marks
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB 2 1
4 3
Harness side
connector AK301121 AB

Connector: B-05

B-05 (GR)

M
2 1
Harness side
connector
AK301120 AF

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 6 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-144 TROUBLESHOOTING

STEP 6. Check harness between B-05 (terminal Connector: C-122

No. 2) No.4 injector connector and C-123 <L. H. drive vehicles>
(terminal No. 15) engine-ECU <M/T> connector or
C-122 (terminal No. 2) engine-A/T-ECU <A/T>
connector.
Connector: B-05
C-122 (GR)
B-05 (GR)

<R. H. drive vehicles>

M
2 1
Harness side
connector
AK301120 AF C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check output line for damage.

C-123 (Y) Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair.
<R. H. drive vehicles>

STEP 7. Fuel pressure measurement.

• Fuel pressure measurement (Refer to fuel
pressure test P.13A-384)
Q: Is the check result normal?
C-123 (Y) YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Repair.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-145

Code No. P0325: Detonation Sensor System

Detonation sensor circuit

C-129 (*1)
(MU801823)
Engine-ECU <M/T>
71 72 73 74 75 76 77 78 79 80 81 or
82 83 84 85 86 87 88 89 90 9192 Engine-A/T-ECU <A/T>

C-126 (*2)
(MU803782) 78 (*1) or
90 (*2)
71 72 73 74 75 76 77
78 79 80 81 8283 8485 8687 88 89
90 91 92 93 94 9596 97 98
W

B B
B-117
(MU802661)

2 1 1 2

Detonation sensor

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301131 AB

OPERATION • In response to the signal, the engine-ECU <M/T>

• The sensor signal is inputted to the engine-ECU or engine-A/T-ECU <A/T> provides controls to
(terminal No. 78) <M/T> or engine-A/T-ECU retard the ignition timing when the detonation
(terminal No. 90) <A/T> from the detonation occurs.
sensor (terminal No. 1).
TROUBLE JUDGMENT
FUNCTION
Check Condition
• The detonation sensor detects the vibration of the
• 2 seconds later after the engine has started up.
cylinder block caused by detonation waves, and
inputs a signal to the engine-ECU <M/T> or Judgment Criterion
engine-A/T-ECU <A/T>. • The change amount of the detonation sensor
output voltage (the detonation sensor peak
voltage in every one half a turn of the crankshaft)
is below 0.08 V in 200 consecutive times.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-146 TROUBLESHOOTING

PROBABLE CAUSE STEP 2. Perform resistance measurement at

• Failed detonation sensor B-117 detonation sensor connector.
• Open/short circuit in detonation sensor circuit or
loose connector contact Connector: B-117
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T> Detonation sensor

DIAGNOSIS PROCEDURE

STEP 1. Connector check: B-117 detonation

sensor connector
Connector: B-117

Detonation sensor

B-117 (GR)

2 1
Harness side connector AK301132 AB

• Disconnect connector, and measure at harness

B-117 (GR) side.
• Resistance between terminal No. 2 and earth.
OK: 2 Ω or less
Q: Is the check result normal?
YES : Go to Step 3 .
2 1 NO : Check and repair harness between B-117
Harness side connector AK301132 AB
(terminal No. 2) detonation sensor
connector and body earth.
Q: Is the check result normal? • Check earthing line for open circuit
YES : Go to Step 2 . and damage.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-147
STEP 3. Connector check: C-129 engine-ECU STEP 4. Check harness between B-117 (terminal
<M/T> connector or C-126 engine-A/T-ECU <A/T> No. 1) detonation sensor connector and C-129
connector (terminal No.78) engine-ECU <M/T> connector or
Connector: C-129
C-126 (terminal No. 90) engine-A/T-ECU <A/T>
<L. H. drive vehicles> connector.
Connector: B-117

Detonation sensor
C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

B-117 (GR)
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-126 2 1
<L. H. drive vehicles> Harness side connector AK301132 AB

Connector: C-129
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles> C-129 (Y)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90 C-129 (Y)
Harness side connector
AK301118 AB

8180 79 78 77 76 75 74 73 72 71
Q: Is the check result normal? 92 91 90 89 88 87 86 85 84 83 82
YES : Go to Step 4 . Harness side connector
AK301111AB
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-148 TROUBLESHOOTING

Connector: C-126 STEP 5. Check the trouble symptoms.

<L. H. drive vehicles>
Q: Does trouble symptom persist?
YES : Go to Step 6 .
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
C-126 (GR)
Service Points P.00-6).

STEP 6. Replace detonation sensor.

<R. H. drive vehicles> • After replacing the detonation sensor, re-check
the trouble symptoms.
Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Check end.
C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

• Check output line for open/short circuit and

damage.
Q: Is the check result normal?
YES : Go to Step 5 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-149

Code No. P0335: Crank Angle Sensor System

Crank angle sensor circuit

Battery

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4

4 3

R-Y

3
B-116
(MU802603)

1 2
3 Crank angle sensor

1 2

B BR-G

40 (*1) or 89 (*1) or
C-125 (*1) 16 (*2) 45 (*2) C-129 (*1)
(MU801822) (MU801823)

31 32 33 34 35 36 37 38 71 72 73 74 75 76 77 78 79 80 81
39 40 41 42 43 44 45 46 82 83 84 85 86 87 88 89 90 9192
5V
C-122 (*2) C-124 (*2)
(MU803784) (MU803781)
Engine-ECU <M/T>
or 41 42 43 44 45 46
1 2 3 4 5 6 7 8 9 10 11 12 13 Engine-A/T-ECU <A/T> 47 48 49 50 51 52 53 54 55 56 57
14 15 16 17 18 19 20 21 22 23 24 25 26 58 59 60 61 62 63 64 65 66

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301133 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-150 TROUBLESHOOTING

OPERATION DIAGNOSIS PROCEDURE

• Power is supplied to the crank angle sensor
(terminal No. 3) from the engine control relay
(terminal No. 4) and is earthed to the engine-ECU STEP 1. MUT-II/III data list
(terminal No. 40) <M/T> or engine-A/T-ECU • Refer to data list reference table P.13A-361.
(terminal No. 16) <A/T> from the crank angle a. Item 22: Crank angle sensor
sensor (terminal No. 1). Q: Is the check result normal?
• A power voltage of 5 V is applied to the crank YES : Intermittent malfunction (Refer to GROUP
angle sensor output terminal (terminal No. 2) 00 − How to Use Troubleshooting/Inspection
from the engine-ECU (terminal No. 89) <M/T> or Service Points P.00-6).
engine-A/T-ECU (terminal No. 45) <A/T>. NO : Go to Step 2 .

FUNCTION
STEP 2. Connector check: B-116 crank angle
• The crank angle sensor detects the crank angle
sensor connector
(position) and inputs a pulse signal to the
engine-ECU<M/T> or engine-A/T-ECU<A/T>. Connector: B-116
• In response to the signal, the engine-ECU<M/T>
or engine-A/T-ECU<A/T> controls the injector,
etc.

TROUBLE JUDGMENT
Crank angle
Check Condition sensor
• Engine in cranking state.
Judgment Criterion
• The sensor output voltage remains unchanged
(no pulse signal is inputted) for 2 seconds.
B-116 (B)
PROBABLE CAUSE
• Failed crank angle sensor
• Open/short circuit in crank angle sensor circuit or
loose connector contact
• Failed engine-ECU<M/T> 2 1
• Failed engine-A/T-ECU<A/T> 3
Harness side connector AK301134 AB

Q: Is the check result normal?

YES : Go to Step 3 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-151
STEP 3. Perform voltage measurement at B-116 STEP 4. Perform voltage measurement at C-129
crank angle sensor connector. engine-ECU <M/T> connector or C-124
engine-A/T-ECU <A/T> connector.
Connector: B-116
Connector: C-129
<L. H. drive vehicles>

Crank angle
sensor C-129 (Y)

<R. H. drive vehicles>

B-116 (B)

C-129 (Y)

2 1
3 8180 79 78 77 76 75 74 73 72 71
Harness side connector AK301134 AB 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
• Disconnect connector, and measure at harness AK301111AB

side.
Connector: C-124
• Ignition switch: ON
<L. H. drive vehicles>
• Voltage between terminal No. 2 and earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 9 .
NO : Go to Step 4 . C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-152 TROUBLESHOOTING

Connector: B-116 STEP 5. Connector check: C-129 engine-ECU

<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>
Crank angle
sensor

C-129 (Y)

<R. H. drive vehicles>

B-116 (B)

2 1
C-129 (Y)
3
Harness side connector AK301134 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU 8180 79 78 77 76 75 74 73 72 71

<A/T> terminal voltage. 92 91 90 89 88 87 86 85 84 83 82

• Disconnect B-116 crank angle sensor connector. Harness side connector

AK301111AB
• Ignition switch: ON
• Voltage between terminal No. 89 <M/T> or Connector: C-124
terminal No. 45 <A/T> and earth. <L. H. drive vehicles>
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 5 .
NO : Go to Step 6 . C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-153

Connector: B-116 STEP 6. Connector check: C-129 engine-ECU

<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-129
<L. H. drive vehicles>
Crank angle
sensor

C-129 (Y)

<R. H. drive vehicles>

B-116 (B)

2 1
C-129 (Y)
3
Harness side connector AK301134 AB

8180 79 78 77 76 75 74 73 72 71
Q: Is the check result normal?
92 91 90 89 88 87 86 85 84 83 82
YES : Check and repair harness between B-116
Harness side connector
(terminal No. 2) crank angle sensor AK301111AB

connector and C-129 (terminal No. 89)

Connector: C-124
engine-ECU <M/T> connector or C-124
<L. H. drive vehicles>
(terminal No. 45) engine-A/T-ECU <A/T>
connector.
• Check output line for open circuit.
NO : Repair or replace.
C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-154 TROUBLESHOOTING

STEP 7. Check harness between B-116 (terminal Connector: C-124

No. 2) crank angle sensor connector and C-129 <L. H. drive vehicles>
(terminal No. 89) engine-ECU <M/T> connector or
C-124 (terminal No. 45) engine-A/T-ECU <A/T>
connector.
Connector: B-116
C-124 (GR)

<R. H. drive vehicles>

Crank angle
sensor

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
B-116 (B) 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for short circuit.

Q: Is the check result normal?
2 1
YES : Go to Step 8 .
3
NO : Repair.
Harness side connector AK301134 AB

Connector: C-129 STEP 8. MUT-II/III data list

<L. H. drive vehicles> • Refer to data list reference table P.13A-361.
a. Item 22: Crank angle sensor
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
C-129 (Y) 00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Replace engine-ECU <M/T> or
<R. H. drive vehicles> engine-A/T-ECU <A/T>.

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-155
STEP 9. Perform voltage measurement at B-116 STEP 10. Connector check: B-16X engine control
crank angle sensor connector. relay connector
Connector: B-116 Connector: B-16X
B-16X
Relay box’s
triangle marks

Crank angle 2 1
sensor
4 3
Harness side
connector AK301121 AB

Connector: B-116
B-116 (B)

Crank angle
2 1 sensor
3
Harness side connector AK301134 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
B-116 (B)
• Voltage between terminal No. 3 and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 11 .
NO : Go to Step 10 . 2 1
3
Harness side connector AK301134 AB

Q: Is the check result normal?

YES : Check and repair harness between B-116
(terminal No. 3) crank angle sensor
connector and B-16X (terminal No. 4)
engine control relay connector.
• Check power supply line for
open/short circuit.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-156 TROUBLESHOOTING

STEP 11. Perform resistance measurement at STEP 12. Connector check: C-125 engine-ECU
B-116 crank angle sensor connector. <M/T> connector or C-122 engine-A/T-ECU <A/T>
connector
Connector: B-116
Connector: C-125
<L. H. drive vehicles>

Crank angle
sensor
C-125 (Y)

<R. H. drive vehicles>

B-116 (B)

C-125 (Y)

2 1
3 38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector AK301134 AB
Harness side connector
• Disconnect connector, and measure at harness AK301135 AB

side.
Connector: C-122
• Resistance between terminal No. 1 and earth.
<L. H. drive vehicles>
OK: 2 Ω or less
Q: Is the check result normal?
YES : Go to Step 14 .
NO : Go to Step 12 .
C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 13 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-157
STEP 13. Check harness between B-116 (terminal Connector: C-122
No. 1) crank angle sensor connector and C-125 <L. H. drive vehicles>
(terminal No. 40) engine-ECU <M/T> connector or
C-122 (terminal No. 16) engine-A/T-ECU <A/T>
connector.
Connector: B-116
C-122 (GR)

<R. H. drive vehicles>

Crank angle
sensor

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
B-116 (B) 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check earthing line for open circuit and damage.

Q: Is the check result normal?
2 1
YES : Go to Step 8 .
3
NO : Repair.
Harness side connector AK301134 AB

Connector: C-125
<L. H. drive vehicles>

C-125 (Y)

<R. H. drive vehicles>

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-158 TROUBLESHOOTING

Q: Is the check result normal?

STEP 14. Perform output wavepattern
YES : Go to Step 16 .
measurement at B-116 crank angle sensor NO : Repair or replace.
connector (Using oscilloscope).
Connector: B-116 STEP 16. Check harness between B-116 (terminal
No. 3) crank angle sensor connector and B-16X
(terminal No. 1) engine control relay connector.
Connector: B-116

Crank angle
sensor

Crank angle
sensor

B-116 (B)

B-116 (B)
2 1
3
Harness side connector AK301134 AB

• Use special tool test harness (MD998478) to 2 1

connect connector, and measure at pick-up 3
harness. Harness side connector AK301134 AB
• Engine: Idling
• Transmission : Neutral<M/T> or P range<A/T> Connector: B-16X
• Voltage between terminal No. 3 and earth. B-16X
OK: Waveforms should be displayed on Relay box’s
Inspection procedure using an oscilloscope triangle marks
(Refer to P.13A-375), its maximum value
should be 4.8 V or more, and its minimum
2 1
value should be 0.6 V or less with no noise in
waveform. 4 3

Q: Is the check result normal? Harness side

connector AK301121 AB
YES : Go to Step 8 .
NO : Go to Step 15 . • Check power supply line for damage.
Q: Is the check result normal?
STEP 15. Connector check: B-16X engine control YES : Go to Step 17 .
relay connector NO : Repair.

Connector: B-16X
B-16X
Relay box’s
triangle marks

2 1
4 3
Harness side
connector AK301121 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-159
STEP 17. Connector check: C-129 and C-125 Connector: C-122, C-124
engine-ECU <M/T> connector or C-124 and C-122 <L. H. drive vehicles>
engine-A/T-ECU <A/T> connectors
Connector: C-125, C-129
<L. H. drive vehicles>
C-124 (GR) C-122 (GR)

<R. H. drive vehicles>

C-129 (Y)
C-125 (Y)

<R. H. drive vehicles>

C-122 (GR) C-124 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
C-129 (Y) 100 99 98 97 96 95 94 93 92 91
C-125 (Y)
C-122: Harness side connector

46 45 44 43 42 41
38 37 36 35 34 33 32 31
57 56 55 54 53 52 51 50 49 48 47
46 45 44 43 42 41 40 39 66 65 64 63 62 61 60 59 58
C-125: Harness side connector C-124: Harness side connector
AK301137 AB
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Q: Is the check result normal?
C-129: Harness side connector
YES : Go to Step 18 .
AK301136 AB
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-160 TROUBLESHOOTING

STEP 18. Check harness between B-116 (terminal Connector: C-124

No. 2) crank angle sensor connector and C-129 <L. H. drive vehicles>
(terminal No. 89) engine-ECU <M/T> connector or
C-124 (terminal No. 45) engine-A/T-ECU <A/T>
connector.
Connector: B-116
C-124 (GR)

<R. H. drive vehicles>

Crank angle
sensor

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
B-116 (B) 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for damage.

Q: Is the check result normal?
2 1
YES : Go to Step 19 .
3
NO : Repair.
Harness side connector AK301134 AB

Connector: C-129
<L. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-161
STEP 19. Check harness between B-116 (terminal Connector: C-122
No. 1) crank angle sensor connector and C-125 <L. H. drive vehicles>
(terminal No. 40) engine-ECU <M/T> connector or
C-122 (terminal No. 16) engine-A/T-ECU <A/T>
connector.
Connector: B-116
C-122 (GR)

<R. H. drive vehicles>

Crank angle
sensor

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
B-116 (B) 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check earthing line for damage.

Q: Is the check result normal?
2 1
YES : Go to Step 20 .
3
NO : Repair.
Harness side connector AK301134 AB

Connector: C-125 STEP 20. Check the crankshaft sensing blade.

<L. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 21 .
NO : Replace the crankshaft sensing blade.

C-125 (Y) STEP 21. MUT-II/III data list

• Refer to data list reference table P.13A-361.
a. Item 22: Crank angle sensor
<R. H. drive vehicles>
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Replace crank angle sensor.
C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-162 TROUBLESHOOTING

Code No. P0340: Camshaft Position Sensor System

Camshaft position sensor circuit

Battery

B-Y
B-Y

B-16X 1 2

1 2
Engine control relay
3 4

4 3

R-Y
3
B-107
(MU802337)

Camshaft position sensor

1 2 3

1 2

B L-R

40 (*1) or 88 (*1) or
C-125 (*1) 16 (*2) 45 (*2) C-129 (*1)
(MU801822) (MU801823)

31 32 33 34 35 36 37 38 71 72 73 74 75 76 77 78 79 80 81
39 40 41 42 43 44 45 46 82 83 84 85 86 87 88 89 90 9192
5V
C-122 (*2) C-124 (*2)
(MU803784) Engine-ECU <M/T> (MU803781)
or
41 42 43 44 45 46
1 2 3 4 5 6 7 8 9 10 11 12 13 Engine-A/T-ECU <A/T>
47 48 49 50 51 52 53 54 55 56 57
14 15 16 17 18 19 20 21 22 23 24 25 26 58 59 60 61 62 63 64 65 66

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301138 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-163
OPERATION DIAGNOSIS PROCEDURE
• Power is supplied to the camshaft position sensor
(terminal No. 3) from the engine control relay
(terminal No. 4) and is earthed to the engine-ECU STEP 1. Connector check: B-107 camshaft
(terminal No. 40) <M/T> or engine-A/T-ECU position sensor connector
(terminal No. 16) <A/T> from the camshaft Connector: B-107
position sensor (terminal No. 1).
• A power voltage of 5 V is applied to the camshaft
B-107 (GR)
position sensor output terminal (terminal No. 2)
from the engine-ECU (terminal No. 88) <M/T> or
engine-A/T-ECU (terminal No. 45) <A/T>.

FUNCTION
• The camshaft position sensor detects the top 3 2 1
dead centre on the compression stroke of the No. Harness side connector AK301139 AB
1 cylinder and inputs a pulse signal to the
engine-ECU <M/T> or engine-A/T-ECU <A/T>. Q: Is the check result normal?
YES : Go to Step 2 .
TROUBLE JUDGMENT NO : Repair or replace.
Check Condition
• After the engine has started up. STEP 2. Perform voltage measurement at B-107
Judgment Criterion camshaft position sensor connector.
• The sensor output voltage remains unchanged Connector: B-107
(no pulse signal is inputted) for 2 seconds.
B-107 (GR)
PROBABLE CAUSE
• Failed camshaft position sensor
• Open/short circuit in camshaft position sensor
circuit or loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T> 3 2 1
Harness side connector AK301139 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Voltage between terminal No. 3 and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Go to Step 3 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-164 TROUBLESHOOTING

STEP 3. Connector check: B-16X engine control STEP 4. Perform voltage measurement at B-107
relay connector camshaft position sensor connector.
Connector: B-16X Connector: B-107
B-16X
Relay box’s
triangle marks B-107 (GR)

2 1
4 3
3 2 1
Harness side
connector AK301121 AB Harness side connector AK301139 AB

• Disconnect connector, and measure at harness

Connector: B-107
side.
• Ignition switch: ON
B-107 (GR) • Voltage between terminal No. 2 and earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 10 .
NO : Go to Step 5 .
3 2 1
Harness side connector AK301139 AB

Q: Is the check result normal?

YES : Check and repair harness between B-107
(terminal No. 3) camshaft position sensor
connector and B-16X (terminal No. 4)
engine control relay connector.
• Check power supply line for
open/short circuit.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-165
STEP 5. Perform voltage measurement at C-129 Connector: B-107
engine-ECU <M/T> connector or C-124
engine-A/T-ECU <A/T> connector. B-107 (GR)
Connector: C-129
<L. H. drive vehicles>

3 2 1
C-129 (Y) Harness side connector AK301139 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU

<R. H. drive vehicles> <A/T> terminal voltage.
• Disconnect B-107 camshaft position sensor
connector.
• Ignition switch: ON
• Voltage between terminal No. 88 <M/T> or
terminal No. 45<A/T> and earth.
C-129 (Y) OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 6 .
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
NO : Go to Step 7 .
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-166 TROUBLESHOOTING

STEP 6. Connector check: C-129 engine-ECU Connector: B-107

connector
Connector: C-129 B-107 (GR)
<L. H. drive vehicles>

C-129 (Y) 3 2 1
Harness side connector AK301139 AB

<R. H. drive vehicles> Q: Is the check result normal?

YES : Check and repair harness between B-107
(terminal No. 2) camshaft position sensor
connector and C-129 (terminal No. 88)
engine-ECU <M/T> connector or C-124
(terminal No. 45) engine-A/T-ECU <A/T>
C-129 (Y)
connector.
• Check output line for open circuit.
NO : Repair or replace.
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-167
STEP 7. Connector check: C-129 engine-ECU STEP 8. Check harness between B-107 (terminal
<M/T> connector or C-122 engine-A/T-ECU <A/T> No. 2) camshaft position sensor connector and
connector C-129 (terminal No. 88) engine-ECU <M/T>
Connector: C-129
connector or C-124 (terminal No. 45)
<L. H. drive vehicles> engine-A/T-ECU <A/T> connector.
Connector: B-107

B-107 (GR)
C-129 (Y)

<R. H. drive vehicles>

3 2 1
Harness side connector AK301139 AB

Connector: C-129
C-129 (Y) <L. H. drive vehicles>

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
C-129 (Y)
Harness side connector
AK301111AB

Connector: C-122 <R. H. drive vehicles>

<L. H. drive vehicles>

C-122 (GR) C-129 (Y)

<R. H. drive vehicles>

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 8 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-168 TROUBLESHOOTING

Q: Is the check result normal?

Connector: C-124
YES : Go to Step 13 .
<L. H. drive vehicles>
NO : Go to Step 11 .

STEP 11. Connector check: C-125 engine-ECU

<M/T> connector or C-122 engine-A/T-ECU <A/T>
C-124 (GR) connector
Connector: C-125
<R. H. drive vehicles> <L. H. drive vehicles>

C-125 (Y)

C-124 (GR)
<R. H. drive vehicles>
46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for short circuit.

Q: Is the check result normal? C-125 (Y)
YES : Go to Step 9 .
NO : Repair. 38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
STEP 9. Check the trouble symptoms. AK301135 AB

Q: Does trouble symptom persist?

YES : Replace engine-ECU <M/T> or Connector: C-122
engine-A/T-ECU <A/T>. <L. H. drive vehicles>
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).

C-122 (GR)
STEP 10. Perform resistance measurement at
B-107 camshaft position sensor connector.
<R. H. drive vehicles>
Connector: B-107

B-107 (GR)

C-122 (GR)

77 76 75 74 73 72 71
3 2 1 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector AK301139 AB Harness side connector
AK301123 AB
• Disconnect connector, and measure at harness
side. Q: Is the check result normal?
• Resistance between terminal No. 1 and earth. YES : Go to Step 12 .
OK: 2 Ω or less NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-169
STEP 12. Check harness between B-107 (terminal Connector: C-122
No. 1) camshaft position sensor connector and <L. H. drive vehicles>
C-125 (terminal No. 40) engine-ECU <M/T>
connector or C-122 (terminal No. 16)
engine-A/T-ECU <A/T> connector.
Connector: B-107
C-122 (GR)

B-107 (GR)
<R. H. drive vehicles>

3 2 1
Harness side connector AK301139 AB C-122 (GR)

Connector: C-125 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check earthing line for open circuit and damage.

C-125 (Y) Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair.
<R. H. drive vehicles>

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-170 TROUBLESHOOTING

STEP 13. Perform output wavepattern STEP 15. Check harness between B-107 (terminal
measurement at B-107 camshaft position sensor No. 3) camshaft position sensor connector and
connector (Using oscilloscope). B-16X (terminal No. 4) engine control relay
connector.
Connector: B-107
Connector: B-107
B-107 (GR)
B-107 (GR)

3 2 1
3 2 1
Harness side connector AK301139 AB
Harness side connector
• Use special tool test harness (MB991709) to AK301139 AB

connect connector, and measure at pick-up

Connector: B-16X
harness. B-16X
• Engine: Idling
Relay box’s
• Transmission : Neutral <M/T> or P range <A/T triangle marks
• Voltage between terminal No. 3 and earth.
OK: Waveforms should be displayed on
Inspection procedure using an oscilloscope 2 1
(Refer to P.13A-375), its maximum value 4 3
should be 4.8 V or more, and its minimum Harness side
value should be 0.6 V or less with no noise in connector AK301121 AB
waveform.
• Check power supply line for damage.
Q: Is the check result normal?
Q: Is the check result normal?
YES : Go to Step 9 .
YES : Go to Step 16 .
NO : Go to Step 14 .
NO : Repair.

STEP 14. Connector check: B-16X engine control

relay connector.
Connector: B-16X
B-16X
Relay box’s
triangle marks

2 1
4 3
Harness side
connector AK301121 AB

Q: Is the check result normal?

YES : Go to Step 15 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-171
STEP 16. Connector check: C-129 and C-125 Connector: C-122, C-124
engine-ECU <M/T> connector or C-124 and C-122 <L. H. drive vehicles>
engine-A/T-ECU <A/T> connectors
Connector: C-125, C-129
<L. H. drive vehicles>
C-124 (GR) C-122 (GR)

<R. H. drive vehicles>

C-129 (Y)
C-125 (Y)

<R. H. drive vehicles>

C-122 (GR) C-124 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
C-129 (Y) 100 99 98 97 96 95 94 93 92 91
C-125 (Y)
C-122: Harness side connector

46 45 44 43 42 41
38 37 36 35 34 33 32 31
57 56 55 54 53 52 51 50 49 48 47
46 45 44 43 42 41 40 39 66 65 64 63 62 61 60 59 58
C-125: Harness side connector C-124: Harness side connector
AK301137 AB
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Q: Is the check result normal?
C-129: Harness side connector
YES : Go to Step 17 .
AK301136 AB
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-172 TROUBLESHOOTING

STEP 17. Check harness between B-107 (terminal Connector: C-124

No. 2) camshaft position sensor connector and <L. H. drive vehicles>
C-129 (terminal No. 88) engine-ECU <M/T>
connector or C-124 (terminal No. 45)
engine-A/T-ECU <A/T> connector.
Connector: B-107
C-124 (GR)

B-107 (GR)
<R. H. drive vehicles>

3 2 1
Harness side connector AK301139 AB C-124 (GR)

Connector: C-129 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for damage.

C-129 (Y) Q: Is the check result normal?
YES : Go to Step 18 .
NO : Repair.
<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-173
STEP 18. Check harness between B-107 (terminal Connector: C-122
No. 1) camshaft position sensor connector and <L. H. drive vehicles>
C-125 (terminal No. 40) engine-ECU <M/T>
connector or C-122 (terminal No. 16)
engine-A/T-ECU <A/T> connector.
Connector: B-107
C-122 (GR)

B-107 (GR)
<R. H. drive vehicles>

3 2 1
Harness side connector AK301139 AB C-122 (GR)

Connector: C-125 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check earthing line for damage.

C-125 (Y) Q: Is the check result normal?

YES : Go to Step 19 .
NO : Repair.
<R. H. drive vehicles>

STEP 19. Check camshaft position sensing

cylinder.
Q: Is the check result normal?
YES : Go to Step 20 .
C-125 (Y) NO : Replace camshaft position sensing cylinder.

38 37 36 35 34 33 32 31 STEP 20. Check the trouble symptoms.

46 45 44 43 42 41 40 39
Q: Does trouble symptom persist?
Harness side connector
AK301135 AB YES : Replace camshaft position sensor.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-174 TROUBLESHOOTING

Code No. P0403: EGR Control Solenoid Valve System

EGR control solenoid valve circuit

Battery

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4

4 3

R-Y

1
B-101

1 2 EGR control solenoid valve

G-O

C-122 (*2) 6 C-123 (*1)

(MU803784) (MU801824)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1 2 3 4 5 6 7 8 9 10 11 12 13
24 25 26 27 28 29 30 3132 33 34 35 14 15 16 17 18 19 20 21 22 23 24 25 26

Engine-ECU <M/T>
or
NOTE Engine-A/T-ECU <A/T>
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301140 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-175
OPERATION DIAGNOSIS PROCEDURE
• Power is supplied to the EGR control solenoid
valve (terminal No. 1) from the engine control
relay (terminal No. 4). STEP 1. MUT-II/III actuator test
• The engine-ECU (terminal No. 6) <M/T> or • Refer to actuator test reference table P.13A-367.
engine-A/T-ECU (terminal No. 6) <A/T> makes a. Item 10: EGR control solenoid valve
the power transistor in the unit be in "ON", and OK: Operating sound can be heard and the
that makes currents go on the EGR control valve vibrates.
solenoid valve (terminal No. 2). Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
FUNCTION
00 − How to Use Troubleshooting/Inspection
• In response to the signal from the engine-ECU
Service Points P.00-6).
<M/T> or engine-A/T-ECU <A/T>, the EGR NO : Go to Step 2 .
control solenoid valve controls the operation of
the EGR valve.
STEP 2. Connector check: B-101 EGR control
TROUBLE JUDGMENT solenoid valve connector
Check Conditions Connector: B-101
• Ignition switch: ON
• The battery voltage is 10 V or more.
Judgment Criterion
• If the off surge voltage from the motor coil is not
generated when the EGR valve control motor is
driven. B-101 (BR)
2 1
PROBABLE CAUSE
Harness side connector
• Failed EGR control solenoid valve AK301141 AB

• Open/short circuit in EGR control solenoid valve

Q: Is the check result normal?
circuit or loose connector contact YES : Go to Step 3 .
• Failed engine-ECU <M/T> NO : Repair or replace.
• Failed engine-A/T-ECU <A/T>

STEP 3. Perform resistance measurement at

B-101 EGR control solenoid valve connector.
Connector: B-101

B-101 (BR)
2 1
Harness side connector AK301141 AB

• Disconnect connector, and measure at solenoid

valve side.
• Resistance between terminal No. 1 and No. 2.
OK: 29 − 35 Ω (at 20°C)
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace EGR control solenoid valve.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-176 TROUBLESHOOTING

YES : Check and repair harness between B-101

STEP 4. Perform voltage measurement at B-101
(terminal No. 1) EGR control solenoid valve
EGR control solenoid valve connector.
connector and B-16X (terminal No. 4)
Connector: B-101 engine control relay connector.
• Check power supply line for
open/short circuit.
NO : Repair or replace.

STEP 6. Perform voltage measurement at C-123

B-101 (BR) engine-ECU <M/T> connector or C-122
2 1 engine-A/T-ECU <A/T> connector.
Harness side connector AK301141 AB Connector: C-123
<L. H. drive vehicles>
• Disconnect connector, and measure at harness
side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage C-123 (Y)
Q: Is the check result normal?
YES : Go to Step 6 . <R. H. drive vehicles>
NO : Go to Step 5 .

STEP 5. Connector check: B-16X engine control

relay connector
Connector: B-16X
B-16X C-123 (Y)

Relay box’s
triangle marks 13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
2 1
4 3
Harness side
connector AK301121 AB

Connector: B-101

B-101 (BR)
2 1
Harness side connector AK301141 AB

Q: Is the check result normal?

 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-177

Connector: C-122 STEP 7. Connector check: C-123 engine-ECU

<L. H. drive vehicles> <M/T> connector or C-122 engine-A/T-ECU <A/T>
connector
Connector: C-123
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-123 (Y)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 C-123 (Y)
Harness side connector
AK301123 AB

• Disconnect connector, and measure at harness 13 12 11 10 9 8 7 6 5 4 3 2 1

26 25 24 23 22 21 20 19 18 17 16 15 14
side.
Harness side connector
• Ignition switch: ON AK301122 AB
• Voltage between terminal No. 6 and earth.
OK: System voltage Connector: C-122
<L. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 8 .
NO : Go to Step 7 .

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-178 TROUBLESHOOTING

Connector: B-101 STEP 8. Connector check: C-123 engine-ECU

<M/T> connector or C-122 engine-A/T-ECU <A/T>
connector
Connector: C-123
<L. H. drive vehicles>

B-101 (BR)
2 1
Harness side connector AK301141 AB C-123 (Y)

Q: Is the check result normal?

YES : Check and repair harness between B-101 <R. H. drive vehicles>
(terminal No. 2) EGR control solenoid valve
connector and C-123 (terminal No. 6)
engine-ECU <M/T> connector or C-122
(terminal No. 6) engine-A/T-ECU <A/T>
connector.
• Check output line for open/short C-123 (Y)
circuit.
NO : Repair or replace.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-179
STEP 9. Check harness between B-101 (terminal Connector: C-122
No. 2) EGR control solenoid valve connector and <L. H. drive vehicles>
C-123 (terminal No. 6) engine-ECU <M/T>
connector or C-122 (terminal No. 6)
engine-A/T-ECU <A/T> connector.
Connector: B-101
C-122 (GR)

<R. H. drive vehicles>

B-101 (BR)
2 1
Harness side connector AK301141 AB C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check output line for damage.

C-123 (Y) Q: Is the check result normal?

YES : Go to Step 10 .
NO : Repair.
<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-180 TROUBLESHOOTING

STEP 10. Check harness between B-101 (terminal STEP 11. MUT-II/III actuator test
No. 1) EGR control solenoid valve connector and • Refer to actuator test reference table P.13A-367.
B-16X (terminal No. 4) engine control relay a. Item 10: EGR control solenoid valve
connector. OK: Operating sound can be heard and the
Connector: B-101 valve vibrates.
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Replace engine-ECU <M/T> or
B-101 (BR) engine-A/T-ECU <A/T>.
2 1
Harness side connector AK301141 AB

Connector: B-16X
B-16X
Relay box’s
triangle marks

2 1
4 3
Harness side
connector AK301121 AB

• Check power supply line for damage.

Q: Is the check result normal?
YES : Go to Step 11 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-181

Code No. P0421: Warm Up Catalyst Malfunction

FUNCTION DIAGNOSIS PROCEDURE

• The signal from the oxygen sensor (rear) differs
from the oxygen sensor (front). That is because
the catalytic converter purifies exhaust gas. STEP 1. Check for leakage of exhaust emission
When the catalytic converter has deteriorated, from exhaust manifold.
the signal from the oxygen sensor (front) Q: Is the check result normal?
becomes similar to the oxygen sensor (rear). YES : Go to Step 2 .
• The engine-ECU <M/T> or engine-A/T-ECU NO : Repair.
<A/T> compares the output of the front and rear
oxygen sensor signals. STEP 2. MUT-II/III data list
• Refer to data list reference table P.13A-361.
TROUBLE JUDGMENT
a. Item 11: Oxygen sensor (front)
Check Conditions b. Item 59: Oxygen sensor (rear)
• Engine speed: 3,000 r/min or less.
Q: Is the check result normal?
• During the driving.
YES : Go to Step 3 .
• During the air-fuel ratio feedback control. NO : Perform the diagnosis code classified check
Judgment Criterion procedure for the sensor that has shown an
• When the output frequency ratio of the oxygen abnormal data valve (Refer to Inspection
sensor (rear) vs. the oxygen sensor (front) is 0.8 Chart for diagnosis codes P.13A-16).
or more on the average for 12 seconds.
STEP 3. MUT-II/III data list
PROBABLE CAUSE
• Refer to data list reference table P.13A-361.
• Catalytic converter deteriorated
a. Item 11: Oxygen sensor (front)
• Failed oxygen sensor (front)
• Failed oxygen sensor (rear) OK: 0 − 0.4 and 0.6 − 1.0 volt should alternate
• Failed engine-ECU <M/T> 15 times or more within 10 seconds (engine
• Failed engine-A/T-ECU <A/T> speed at 2,000 r/min).
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace the oxygen sensor (front).

STEP 4. Replace the oxygen sensor (rear).

• After replacing the oxygen sensor (rear),
re-check the trouble symptoms.
Q: Is the check result normal?
YES : Go to Step 5 .
NO : Check end.

STEP 5. Replace the catalytic converter.

• After replacing the catalytic converter, re-check
the trouble symptoms.
Q: Is the check result normal?
YES : Replacing engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Check end.

Code No. P0443: Purge Control Solenoid Valve System

 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-182 TROUBLESHOOTING

Purge control solenoid valve circuit

Battery

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4

4 3

R-Y

B-105 2
(MU802779)

1 2 Purge control solenoid valve

Y-G

9 (*1) or
34 (*2)
C-122 (*2) C-123 (*1)
(MU803784) (MU801824)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1 2 3 4 5 6 7 8 9 10 11 12 13
24 25 26 27 28 29 30 3132 33 34 35 14 15 16 17 18 19 20 21 22 23 24 25 26

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>
NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301142 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-183
OPERATION DIAGNOSIS PROCEDURE
• Power is supplied to the purge control solenoid
valve (terminal No. 2) from the engine control
relay (terminal No. 4). STEP 1. MUT-II/III actuator test
• The engine-ECU (terminal No. 9) <M/T> or • Refer to actuator test reference table P.13A-367.
engine-A/T-ECU (terminal No. 34) <A/T> makes a. Item 08: Purge control solenoid valve
the power transistor in the unit be in "ON" OK: Operating sound can be heard and the
position, and that makes currents go on the purge valve vibrates
control solenoid valve (terminal No. 1). Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
FUNCTION
00 − How to Use Troubleshooting/Inspection
• In response to a signal from the engine-ECU
Service Points P.00-6).
<M/T> or engine-A/T-ECU <A/T>, the purge NO : Go to Step 2 .
control solenoid valve controls the flow rate of the
purge air to be introduced into the surge tank.
STEP 2. Connector check: B-105 purge control
TROUBLE JUDGMENT solenoid valve connector
Check Conditions Connector: B-105
• Ignition switch: ON
• The battery voltage is 10 V or more.
Judgment Criterion
• The surge voltage (system voltage + 2 V) of
solenoid coil is not detected when the purge
control solenoid valve is turned to OFF from ON.
2 1
• The battery voltage is 10 V or more.
Harness side B-105 (B)
PROBABLE CAUSE connector AK301143 AB

• Failed purge control solenoid valve

Q: Is the check result normal?
• Open/short circuit in purge control solenoid value YES : Go to Step 3 .
circuit or loose connector contact NO : Repair or replace.
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
STEP 3. Perform resistance measurement at
B-105 purge control solenoid valve connector.
Connector: B-105

2 1
Harness side B-105 (B)
connector AK301143 AB

• Disconnect connector, and measure at solenoid

valve side.
• Resistance between terminal No. 1 and No. 2.
OK: 30 − 34 Ω (at 20°C)
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace purge control solenoid valve.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-184 TROUBLESHOOTING

STEP 4. Perform voltage measurement at B-105 STEP 5. Connector check: B-16X engine control
purge control solenoid valve connector. relay connector
Connector: B-105 Connector: B-16X
B-16X
Relay box’s
triangle marks

2 1

2 1 4 3
Harness side Harness side
B-105 (B) connector
connector AK301143 AB AK301121 AB

• Disconnect connector, and measure at harness

Connector: B-105
side.
• Ignition switch: ON
• Voltage between terminal No. 2 and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 6 .
NO : Go to Step 5 . 2 1
Harness side B-105 (B)
connector AK301143 AB

Q: Is the check result normal?

YES : Check and repair harness between B-105
(terminal No. 2) purge control solenoid valve
connector and B-16X (terminal No. 4)
engine control relay connector.
• Check power line for open/short
circuit.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-185
Q: Is the check result normal?
STEP 6. Perform voltage measurement at C-123
YES : Go to Step 8 .
engine-ECU <M/T> connector or C-122 NO : Go to Step 7 .
engine-A/T-ECU <A/T> connector.
Connector: C-123
STEP 7. Connector check: C-123 engine-ECU
<L. H. drive vehicles>
<M/T> connector or C-122 engine-A/T-ECU <A/T>
connector
Connector: C-123
<L. H. drive vehicles>
C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
C-123 (Y)
Harness side connector
AK301122 AB

13 12 11 10 9 8 7 6 5 4 3 2 1
Connector: C-122
26 25 24 23 22 21 20 19 18 17 16 15 14
<L. H. drive vehicles>
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>
C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector C-122 (GR)
AK301123 AB

• Disconnect connector, and measure at harness 77 76 75 74 73 72 71

90 89 88 87 86 85 84 83 82 81 80 79 78
side. 100 99 98 97 96 95 94 93 92 91

• Ignition switch: ON Harness side connector

AK301123 AB
• Voltage between terminal No. 9 <M/T> or
terminal No. 34 <A/T> and earth.
OK: System voltage
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-186 TROUBLESHOOTING

Connector: B-105 STEP 8. Connector check: C-123 engine-ECU

<M/T> connector or C-122 engine-A/T-ECU <A/T>
connector
Connector: C-123
<L. H. drive vehicles>

2 1
Harness side B-105 (B)
connector AK301143 AB C-123 (Y)

Q: Is the check result normal?

YES : Check and repair harness between B-105 <R. H. drive vehicles>
(terminal No. 1) purge control solenoid valve
connector and C-123 (terminal No. 9)
engine-ECU <M/T> connector or C-122
(terminal No. 34) engine-A/T-ECU <A/T>
connector.
• Check output line for open and short C-123 (Y)
circuit.
NO : Repair or replace.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-187
STEP 9. Check harness between B-105 (terminal Connector: C-122
No. 1) purge control solenoid valve connector <L. H. drive vehicles>
and C-123 (terminal No. 9) engine-ECU <M/T>
connector or C-122 (terminal No. 34)
engine-A/T-ECU <A/T> connector.
Connector: B-105
C-122 (GR)

<R. H. drive vehicles>

2 1
Harness side B-105 (B)
connector AK301143 AB C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check output line for damage.

C-123 (Y) Q: Is the check result normal?

YES : Go to Step 10 .
NO : Repair.
<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-188 TROUBLESHOOTING

STEP 10. Check harness between B-105 (terminal STEP 11. MUT-II/III actuator test
No. 2) purge control solenoid valve connector • Refer to actuator test reference table P.13A-367.
and B-16X (terminal No. 4) engine control relay a. Item 08: purge control solenoid valve
connector. OK: Operating sound can be heard and the
Connector: B-105 valve vibrates
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
2 1
Harness side B-105 (B)
connector AK301143 AB

Connector: B-16X
B-16X
Relay box’s
triangle marks

2 1
4 3
Harness side
connector AK301121 AB

• Check power line for damage.

Q: Is the check result normal?
YES : Go to Step 11 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-189

Code No. P0500: Vehicle Speed Sensor System <M/T>

Vehicle speed sensor circuit

Ignition switch Engine-ECU

C-201 C-129
R LOCK 5V (MU801823)
1 2 3
4 5 6 ST ACC
IG1 IG2 71 72 73 74 75 76 77 78 79 80 81
82 83 84 85 86 87 88 89 90 9192

2
B-W 86
C-210
6
B-Y
2
J/B
7.5 A C-13 (*1) or
C-137 (*2)
25
11 Meter and gauge
C-209
B-W

C-37 (*1) or
C-137 (*2)
16 B-Y
B-W

1 3

B-07
(MU802723)

1 2 3 Vehicle speed sensor

B B

NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301144 AB

OPERATION FUNCTION
• A power voltage of 5 V is applied to the vehicle • The vehicle speed sensor converts the vehicle
speed sensor (terminal No. 3) from the speed to the voltage, and then input it into the
engine-ECU (terminal No. 86). engine-ECU.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-190 TROUBLESHOOTING

TROUBLE JUDGMENT STEP 2. MUT-II/III data list

Check Conditions • Refer to data list reference table P.13A-361.
• 2 seconds later after the engine has started up. a. Item 24: Vehicle speed sensor
• Engine speed: 2,000 r/min or more. Q: Is the check result normal?
Judgment Criterion YES : Go to Step 3 .
• The sensor output voltage remains unchanged NO : Intermittent malfunction (Refer to GROUP
(no pulse signal is inputted) for 2 seconds. 00 - How to Use Troubleshooting/Inspection
Service Points P.00-6).
PROBABLE CAUSE
• Failed Vehicle speed sensor STEP 3. Check connector: C-129 engine-ECU
• Open/short circuit in vehicle speed sensor circuit connector
or loose connector contact
• Failed engine-ECU Connector: C-129
<L. H. drive vehicles>
DIAGNOSIS PROCEDURE
NOTE: .
*1: L.H. drive vehicles
*2: R.H. drive vehicles C-129 (Y)

STEP 1. Check the speedometer <R. H. drive vehicles>

Q: Is the check result normal?
YES : Go to Step 2 .
NO : Check the speedometer (Refer to GROUP
54A −Combination Meter Assembly and
Vehicle speed sensor − On-vehicle Service
C-129 (Y)
P.54A-61).

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Q: Is the check result normal?

YES : Go to Step 4 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-191
STEP 4. Check harness between C-129 (terminal STEP 5. Check the trouble symptoms.
No. 86) engine-ECU connector and B-07 (terminal Q: Does trouble symptom persist?
No. 3) vehicle speed sensor connector. YES : Replacing engine-ECU <M/T> or
Connector: C-129 engine-A/T-ECU <A/T>.
<L. H. drive vehicles> NO : Intermittent malfunction (Refer to GROUP
00 - How to Use Troubleshooting/Inspection
Service Points P.00-6).

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: B-07

B-07 (B)

3 2 1
Harness side connector AK301145 AB

NOTE: Before checking harness, check intermediate

connector C-13 *1 or C-137*2 , and repair if
necessary.
• Check output line for open circuit and damage.
Q: Is the check result normal?
YES : Go to Step 5 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-192 TROUBLESHOOTING

Code No. P0505: Idle Speed Control Servo System

Idle speed control servo circuit

Battery

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4

4 3
R-Y
28
J/C (6)
C-12
33
R-Y

R-Y R-Y
2 5
B-103

1 2 3
Idle speed control servo
4 5 6

1 3 4 6

Y-L Y R-G LG

4 (*1) or 17 (*1) or 5 (*1) or 18 (*1) or

14 (*2) 28 (*2) 15 (*2) 29 (*2)
C-123 (*1)
(MU801824)

1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26

C-122 (*2)
(MU803784)
1 2 3 4 5 6 7 8
Engine-ECU <M/T>
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
or
24 25 26 27 28 29 30 3132 33 34 35
Engine-A/T-ECU <A/T>

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301146 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-193
OPERATION Judgment Criterion
• The power is supplied to the idle speed control • The actual idle speed is lower than the target idle
servo (terminal No. 2 and No. 5) from the engine speed by 100 r/min or more for 10 seconds.
control relay (terminal No. 4).
• The engine-ECU (terminal No. 4, No. 5, No. 17 PROBABLE CAUSE
and No. 18) <M/T> or engine-A/T-ECU (terminal • Failed idle speed control servo
No. 14, No. 28, No. 15, No. 29) <A/T> makes • Open/short circuit in idle speed control servo
power transistor in the unit be in "ON" position in circuit or loose connector contact
order, and that makes currents go on the idle • Failed engine-ECU <M/T>
speed control servo (terminal No. 1, No. 3, No. 4 • Failed engine-A/T-ECU <A/T>
and No. 6).
DIAGNOSIS PROCEDURE
FUNCTION
• The idle speed control servo opens and closes
STEP 1. MUT-II/III data list
the servo valve in response to a signal from the
• Refer to data list reference table P.13A-361.
engine-ECU <M/T> or engine-A/T-ECU <A/T> to
a. Item 45: Idle speed control position
control the intake air flow rate during idling.
Q: Is the check result normal?
TROUBLE JUDGMENT YES : Intermittent malfunction (Refer to GROUP
Check Conditions 00 − How to Use Troubleshooting/Inspection
• The vehicle speed has reached 1.5 km/h or more Service Points P.00-6).
NO : Go to Step 2 .
at least once.
• During the closed-loop idle speed control.
STEP 2. Connector check: B-103 idle speed
Judgment Criterion
control servo connector
• The actual idle speed is higher than the target
idle speed by 300 r/min or more for 10 seconds. Connector: B-103

Check Conditions
• The vehicle speed has reached 1.5 km/h or more
at least once.
• During the closed-loop idle speed control.
• The highest ambient temperature at the last drive
is 45 °C or less. 3 2 1 B-103 (B)
• The engine coolant temperature is 82°C or 6 5 4
higher. Harness side connector AK301147 AB
• The battery voltage is 10 V or more.
• The intake air temperature is −10°C or higher. Q: Is the check result normal?
Judgment Criterion YES : Go to Step 3 .
• The actual idle speed is higher than the target NO : Repair or replace.
idle speed by 200 r/min or more for 10 seconds.
Check Conditions STEP 3. Check idle speed control servo itself.
• During the closed-loop idle speed control. • Check idle speed control servo itself (Refer to
• The engine coolant temperature is 82°C or P.13A-394).
higher. Q: Is the check result normal?
• The battery voltage is 10 V or more. YES : Go to Step 4 .
• The power steering fluid pressure switch is in NO : Replace idle speed control servo.
OFF position.
• The intake air pipe pressure is 53 kPa or more.
• The intake air temperature is −10°C or higher.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-194 TROUBLESHOOTING

STEP 4. Perform voltage measurement at B-103 STEP 5. Check connector: B-16X engine control
idle speed control servo connector. relay connector
Connector: B-103 Connector: B-16X
B-16X
Relay box’s
triangle marks

2 1
3 2 1 B-103 (B) 4 3
6 5 4
Harness side
Harness side connector AK301147 AB connector AK301121 AB

• Disconnect connector, and measure at harness

Connector: B-103
side.
• Ignition switch: ON
• Voltage between terminal No. 2 and earth, also
between terminal No. 5 and earth.
OK: System voltage
Q: Is the check result normal?
3 2 1 B-103 (B)
YES : Go to Step 6 .
6 5 4
NO : Go to Step 5 .
Harness side connector AK301147 AB

Q: Is the check result normal?

YES : Check and repair harness between B-103
(terminal No. 2 or No. 5) idle speed control
servo connector and B-16X (terminal No. 4)
engine control relay connector.
• Check power supply line for
open/short circuit.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-195
STEP 6. Perform voltage measurement at C-123 Connector: B-103
engine-ECU <M/T> connector or C-122
engine-A/T-ECU <A/T> connector.
Connector: C-123
<L. H. drive vehicles>

3 2 1 B-103 (B)
6 5 4
Harness side connector AK301147 AB
C-123 (Y)
• Disconnect connector, and measure at harness
<R. H. drive vehicles> side.
• Ignition switch: ON
• Voltage between terminal No. 4 <M/T> or
terminal No. 14 <A/T> and earth, between
terminal No. 5 <M/T> or terminal No. 15 <A/T>
and earth, between terminal No. 17 <M/T> or
C-123 (Y) terminal No. 28 <A/T> and earth, also voltage
between terminal No. 18 <M/T> or terminal No.
29 <A/T> and earth.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
OK: System voltage
Harness side connector Q: Is the check result normal?
AK301122 AB
YES : Go to Step 7 .
NO : Check and repair harness between B-103
Connector: C-122
<L. H. drive vehicles>
idle speed control servo and C-123
engine-ECU <M/T> or C-122
engine-A/T-ECU <A/T>.
1. Harness between idle speed control
servo terminal No. 1 and
C-122 (GR) engine-ECU <M/T> connector
terminal No. 4 or engine-A/T-ECU
<A/T> connector terminal No. 14
<R. H. drive vehicles> 2. Harness between idle speed control
servo terminal No. 3 and
engine-ECU <M/T> connector
terminal No. 17 or engine-A/T-ECU
<A/T> connector terminal No. 28
3. Harness between idle speed control
C-122 (GR) servo terminal No. 4 and
77 76 75 74 73 72 71
engine-ECU <M/T> connector
90 89 88 87 86 85 84 83 82 81 80 79 78 terminal No. 5 or engine-A/T-ECU
100 99 98 97 96 95 94 93 92 91
<A/T> connector terminal No. 15
Harness side connector
AK301123 AB 4. Harness between idle speed control
servo terminal No. 6 and
engine-ECU <M/T> connector
terminal No. 18 or engine-A/T-ECU
<A/T> connector terminal No. 29
• Check power supply line for
open/short circuit.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-196 TROUBLESHOOTING

STEP 7. Connector check: C-123 engine-ECU STEP 8. Check harness between B-103 idle
<M/T> connector or C-122 engine-A/T-ECU <A/T> speed control servo and C-123 engine-ECU
connector <M/T> connector or C-122 engine-A/T-ECU <A/T>.
Connector: C-123 Connector: B-103
<L. H. drive vehicles>

C-123 (Y)
3 2 1 B-103 (B)
6 5 4
<R. H. drive vehicles>
Harness side connector AK301147 AB

Connector: C-123
<L. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1 C-123 (Y)
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB <R. H. drive vehicles>

Connector: C-122
<L. H. drive vehicles>

C-123 (Y)

C-122 (GR)
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
<R. H. drive vehicles> Harness side connector
AK301122 AB

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 8 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-197

Connector: C-122 STEP 9. Check harness between B-103 (terminal

<L. H. drive vehicles> No. 2 or No. 5) idle speed control servo
connector and B-16X (terminal No. 4) engine
control relay connector.
Connector: B-103

C-122 (GR)

<R. H. drive vehicles>

3 2 1 B-103 (B)
6 5 4
Harness side connector AK301147 AB

C-122 (GR)
Connector: B-16X
77 76 75 74 73 72 71 B-16X
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 Relay box’s
triangle marks
Harness side connector
AK301123 AB

1. Harness between idle speed control servo

2 1
terminal No. 1 and engine-ECU connector
terminal No. 4 or engine-A/T-ECU <A/T> 4 3
connector terminal No. 14 Harness side
2. Harness between idle speed control servo connector AK301121 AB

terminal No. 3 and engine-ECU connector • Check power supply line for damage.
terminal No. 17 or engine-A/T-ECU <A/T>
connector terminal No. 28 Q: Is the check result normal?
YES : Go to Step 10 .
3. Harness between idle speed control servo
NO : Repair.
terminal No. 4 and engine-ECU connector
terminal No. 5 or engine-A/T-ECU <A/T>
connector terminal No. 15 STEP 10. MUT-II/III data list
4. Harness between idle speed control servo • Refer to data list reference table P.13A-361.
terminal No. 6 and engine-ECU connector a. Item 45: Idle speed control position
terminal No. 18 or engine-A/T-ECU <A/T> Q: Is the check result normal?
connector terminal No. 29 YES : Intermittent malfunction (Refer to GROUP
• Check output line for damage. 00 − How to Use Troubleshooting/Inspection
Q: Is the check result normal? Service Points P.00-6).
YES : Go to Step 9 . NO : Replace engine-ECU <M/T> or
NO : Repair. engine-A/T-ECU <A/T>.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-198 TROUBLESHOOTING

Code No. P0513: Immobilizer System

Immobilizer-ECU circuit

C-202-1
Immobilizer-ECU
1 2 3 4

C-202
(MU801547)
C-202-1 3
1 2
3 4 5 6 7

R-W
C-13 (*3) or C-137 (*4)
21

R-W
51 (*1) or
111 (*2)
C-128 (*2) C-127 (*1)
(MU803783) (MU801820)
101 102 103 104 105 106 107
108 109 110 111 112113 114115 116 117 118 119 120 51 52 53 54 55 56
121 122123 124 125 126 127 128 129 130 57 58 59 60 61 62

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301148 AB

OPERATION NOTE: .
• The signals are sent and received between • If the registered ignition keys are close each
engine-ECU (terminal No. 51) <M/T> or other when starting the engine, radio
engine-A/T-ECU (terminal No. 111) <A/T> and interference may cause this code to be
immobilizer-ECU (terminal No. 7). displayed.
• This code may be displayed when registering
FUNCTION the key encrypted code.
• Engine-ECU <M/T> or engine-A/T-ECU <A/T>
sends or receives the control signals to or from TROUBLE JUDGMENT
immobilizer-ECU to certify the ignition key.
Check Condition
• Ignition switch: ON
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-199
Judgment Criterion
• Improper communication problems between the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
and the immobilizer-ECU is detected.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-200 TROUBLESHOOTING

PROBABLE CAUSE
Connector: C-128
• Open/short circuit in immobilizer system circuit or
<L. H. drive vehicles>
loose connector contact
• Failed immobilizer-ECU
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
C-128 (GR)
DIAGNOSIS PROCEDURE
NOTE: .
<R. H. drive vehicles>
*1: L.H. drive vehicles
*2: R.H. drive vehicles

STEP 1. Connector check: C-202

immobilizer-ECU connector and C-127
engine-ECU <M/T> connector or C-128 C-128 (GR)
engine-A/T-ECU <A/T> connector
107 106 105 104 103 102 101
120 119 118 117 116 115 114113 112 111 110 109 108
Connector: C-202 130 129 128 127 126 125 124 123 122 121

Harness side connector

AK301150 AB

Q: Is the check result normal?

C-202 YES : Go to Step 2 .
NO : Repair or replace.
2 1
7 6 5 4 3
Harness side
connector AK301149 AB

Connector: C-127
<L. H. drive vehicles>

C-127 (Y)

<R. H. drive vehicles>

C-127 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301126AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-201
STEP 2. Check harness between C-202 (terminal Connector: C-128
No. 3) immobilizer-ECU connector and C-127 <L. H. drive vehicles>
(terminal No. 51) engine-ECU <M/T> connector or
C-128 (terminal No. 111) engine-A/T-ECU <A/T>
connector.
Connector: C-202 C-128 (GR)

<R. H. drive vehicles>

C-202
2 1
7 6 5 4 3
Harness side
connector AK301149 AB C-128 (GR)

Connector: C-127 107 106 105 104 103 102 101

120 119 118 117 116 115 114113 112 111 110 109 108
<L. H. drive vehicles> 130 129 128 127 126 125 124 123 122 121

Harness side connector

AK301150 AB

NOTE: Before checking harness, check intermediate

C-127 (Y) connector C-13*1 or C-137*2 , and repair if
necessary.
• Check output line for open/short circuit and
<R. H. drive vehicles> damage.
Q: Is the check result normal?
YES : Go to Step 3 .
NO : Repair.

C-127 (Y)
STEP 3. Check the trouble symptoms.
Q: Does trouble symptom persist?
8180 79 78 77 76 75 74 73 72 71 YES : Go to Step 4 .
92 91 90 89 88 87 86 85 84 83 82 NO : Intermittent malfunction (Refer to GROUP
Harness side connector
AK301126AB
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).

STEP 4. After replacing the immobilizer-ECU,

re-check the trouble symptoms.
Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Check end.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-202 TROUBLESHOOTING

Code No. P0551: Power Steering Fluid Pressure Switch System

Power steering fluid pressure switch

C-125 (*1)
(MU801822)
Engine-ECU <M/T>
31 32 33 34 35 36 37 38 or
39 40 41 42 43 44 45 46 Engine-A/T-ECU <A/T>
C-124 (*2)
(MU803781)
37 (*1) or
41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57
52 (*2)
58 59 60 61 62 63 64 65 66

R-W

1
B-115

1 Power steering fluid pressure switch

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301151 AB

CONDITION • The engine coolant temperature is 30°C or

• The battery voltage is applied to the power higher.
steering fluid pressure switch (terminal No. 1) • Repeat, 10 times or more, the *1 running and
from the engine-ECU (terminal No. 37) <M/T> or stop also *2 running.
engine-A/T-ECU (terminal No. 52) <A/T>. *1 running: engine speed of 2,500 r/min or more
(Vehicle speed of 50 km/h or more).
FUNCTION *2 running: Vehicle speed of 1.5 km/h or less.
• It is detected whether a load is applied on the
power steering fluid pump by steering or not, and Judgment Criteria
the signal is inputted to the engine-ECU <M/T> or • The power steering fluid pressure switch remains
engine-A/T-ECU <A/T>. When the power in ON position.
steering fluid pressure switch "ON" signal (a large
PROBABLE CAUSE
load on the power steering fluid pump) is
• Failed power steering fluid pressure switch
inputted, the engine-ECU <M/T> or
• Open/short circuit in power steering fluid
engine-A/T-ECU <A/T> provides the idle-up
pressure switch circuit or loose connector contact
control.
• Failed engine-ECU <M/T>
TROUBLE JUDGMENT • Failed engine-A/T-ECU <A/T>

Check Conditions
• The intake air temperature is −10°C or higher.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-203
DIAGNOSIS PROCEDURE STEP 3. Perform voltage measurement at C-125
engine-ECU <M/T> connector or C-124
STEP 1. Connector check: B-115 power steering engine-A/T-ECU <A/T> connector.
fluid pressure switch connector Connector: C-125
<L. H. drive vehicles>
Connector: B-115

C-125 (Y)
1
Harness side
connector <R. H. drive vehicles>

B-115
AK301152AB

Q: Is the check result normal?

YES : Go to Step 2 .
NO : Repair or replace. C-125 (Y)

STEP 2. Perform voltage measurement at B-115 38 37 36 35 34 33 32 31

power steering fluid pressure switch connector. 46 45 44 43 42 41 40 39
Harness side connector
Connector: B-115 AK301135 AB

Connector: C-124
<L. H. drive vehicles>

1
Harness side
connector
C-124 (GR)
B-115
AK301152AB

• Disconnect connector, and measure at harness <R. H. drive vehicles>

side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal? C-124 (GR)
YES : Go to Step 8 .
46 45 44 43 42 41
NO : Go to Step 3 . 57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU

<A/T> terminal voltage.
• Ignition switch: ON
• Voltage between terminal No. 37 <M/T> or
terminal No. 52 <A/T> and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Go to Step 5 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-204 TROUBLESHOOTING

STEP 4. Connector check: C-125 engine-ECU Connector: B-115

<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-125
<L. H. drive vehicles>
1
Harness side
connector

B-115
C-125 (Y) AK301152AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check and repair harness between B-115
(terminal No. 1) power steering fluid
pressure switch connector and C-125
(terminal No. 37) engine-ECU <M/T>
connector or C-124 (terminal No. 52)
engine-A/T-ECU <A/T> connector.
C-125 (Y) • Check output line for open circuit.
NO : Repair or replace.
38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-205
YES : Go to Step 6 .
STEP 5. Connector check: C-125 engine-ECU
NO : Repair or replace.
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-125
<L. H. drive vehicles>

C-125 (Y)

<R. H. drive vehicles>

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-206 TROUBLESHOOTING

STEP 6. Check harness between B-115 (terminal Connector: C-124

No. 1) power steering fluid pressure switch <L. H. drive vehicles>
connector and C-125 (terminal No. 37)
engine-ECU <M/T> connector or C-124 (terminal
No. 52) engine-A/T-ECU <A/T> connector.
Connector: B-115
C-124 (GR)

<R. H. drive vehicles>

1
Harness side
connector

B-115
AK301152AB C-124 (GR)

46 45 44 43 42 41
Connector: C-125 57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for short circuit.

Q: Is the check result normal?
C-125 (Y)
YES : Go to Step 7 .
NO : Repair.
<R. H. drive vehicles>
STEP 7. MUT-II/III data list
• Refer to data list reference table P.13A-361.
a. Item 27: Power steering fluid pressure switch
Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
C-125 (Y)
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
38 37 36 35 34 33 32 31 NO : Replace engine-ECU <M/T> or
46 45 44 43 42 41 40 39
engine-A/T-ECU <A/T>.
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-207
Q: Is the check result normal?
STEP 8. Perform voltage measurement at C-125
YES : Go to Step 11 .
engine-ECU <M/T> connector or C-124 NO : Go to Step 9 .
engine-A/T-ECU <A/T> connector.
Connector: C-125
STEP 9. Connector check: C-125 engine-ECU
<L. H. drive vehicles>
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-125
<L. H. drive vehicles>
C-125 (Y)

<R. H. drive vehicles>

C-125 (Y)

<R. H. drive vehicles>

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector C-125 (Y)
AK301135 AB

38 37 36 35 34 33 32 31
Connector: C-124
46 45 44 43 42 41 40 39
<L. H. drive vehicles>
Harness side connector
AK301135 AB

Connector: C-124
<L. H. drive vehicles>
C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector C-124 (GR)

AK301112 AB
46 45 44 43 42 41
• Measure engine-ECU <M/T> or engine-A/T-ECU 57 56 55 54 53 52 51 50 49 48 47
<A/T> terminal voltage. 66 65 64 63 62 61 60 59 58

• Engine: Idling Harness side connector

AK301112 AB
• Voltage between terminal No. 37 <M/T> or
terminal No. 52 <A/T> and earth. Q: Is the check result normal?
OK: YES : Go to Step 10 .
System voltage (Steering wheel: Stationary) NO : Repair or replace.
1 V or less (Steering wheel: Turned)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-208 TROUBLESHOOTING

STEP 10. Check harness between B-115 (terminal Connector: C-124

No. 1) power steering fluid pressure switch <L. H. drive vehicles>
connector and C-125 (terminal No. 37)
engine-ECU <M/T> connector or C-124
engine-A/T-ECU <A/T> connector.
Connector: B-115
C-124 (GR)

<R. H. drive vehicles>

1
Harness side
connector

B-115
AK301152AB C-124 (GR)

46 45 44 43 42 41
Connector: C-125 57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for damage.

Q: Is the check result normal?
C-125 (Y)
YES : Replace power steering fluid pressure
switch.
<R. H. drive vehicles> NO : Repair.

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-209
Q: Is the check result normal?
STEP 11. Connector check: C-125 engine-ECU
YES : Go to Step 7 .
<M/T> connector or C-124 engine-A/T-ECU <A/T> NO : Repair or replace.
connector
Connector: C-125
<L. H. drive vehicles>

C-125 (Y)

<R. H. drive vehicles>

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-210 TROUBLESHOOTING

Code No. P0622: Alternator FR Terminal System

Alternator circuit

C-125 (*1)
(MU801822)
Engine-ECU <M/T>
31 32 33 34 35 36 37 38 or
39 40 41 42 43 44 45 46 Engine-A/T-ECU <A/T>

C-124 (*2)
(MU803781)
41 (*1) or
41 42 43 44 45 46 54 (*2)
47 48 49 50 51 52 53 54 55 56 57
58 59 60 61 62 63 64 65 66
W

B-18
1

4
B-26
(MU802046)
IC Voltage
1 2 3 4 regulator Alternator

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301153 AB

OPERATION TROUBLE JUDGMENT

• The energized state of the alternator field coil is
Check Condition
inputted from the alternator (terminal No. 4) to the
• Engine speed is 50 r/min or more.
engine-ECU (terminal No. 41) <M/T> or
engine-A/T-ECU (terminal No. 54) <A/T>. Judgment Criterion
• Input voltage from alternator FR terminal is the
FUNCTION system voltage or more for 20 seconds.
• A signal of the power supply duty ratio for the
alternator field coil is inputted to the engine-ECU PROBABLE CAUSE
<M/T> or engine-A/T-ECU <A/T>. • Open circuit in alternator FR terminal circuit
• In response to the signal, the engine-ECU <M/T> • Failed engine-ECU <M/T>
or engine-A/T-ECU <A/T> detects the alternator • Failed engine-A/T-ECU <A/T>
output current and controls the idling speed
according to the output current (electric load).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-211
DIAGNOSIS PROCEDURE STEP 3. Connector check: C-125 engine-ECU
<M/T> connector or C-124 engine-A/T-ECU <A/T>
STEP 1. Connector check: B-18 intermediate connector
connector Connector: C-125
<L. H. drive vehicles>
Connector: B-18

B-18 (B)
C-125 (Y)
3 2 1
6 5 4 <R. H. drive vehicles>
Female side
connector
AK301242AB

Q: Is the check result normal?

YES : Go to Step 2 .
NO : Repair or replace. C-125 (Y)

STEP 2. Perform voltage measurement at B-18 38 37 36 35 34 33 32 31

intermediate connector. 46 45 44 43 42 41 40 39
Harness side connector
Connector: B-18 AK301135 AB

Connector: C-124
<L. H. drive vehicles>
B-18 (B)

1 2 3
4 5 6
Male side C-124 (GR)
connector
AK301154 AB

• Disconnect connector, and measure at male <R. H. drive vehicles>

connector side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal? C-124 (GR)
YES : Go to Step 6 .
NO : Go to Step 3 . 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 4 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-212 TROUBLESHOOTING

STEP 4. Check harness between B-18 (terminal Connector: C-124

No. 1) intermediate connector and C-125 <L. H. drive vehicles>
(terminal No. 41) engine-ECU <M/T> connector or
C-124 engine-A/T-ECU <A/T> connector.
Connector: B-18

C-124 (GR)

B-18 (B) <R. H. drive vehicles>

1 2 3
4 5 6
Male side
connector
AK301154 AB
C-124 (GR)
Connector: C-125
46 45 44 43 42 41
<L. H. drive vehicles> 57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for short circuit.

C-125 (Y)
Q: Is the check result normal?
YES : Go to Step 5 .
<R. H. drive vehicles> NO : Repair.

STEP 5. Check the trouble symptoms.

Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
C-125 (Y)
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
38 37 36 35 34 33 32 31 Service Points P.00-6).
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-213
STEP 6. Perform voltage measurement at B-18 STEP 8. Check harness between B-26 (terminal
intermediate connector. No. 4) alternator connector and B-18 (terminal
No. 1) intermediate connector.
Connector: B-18
Connector: B-26

B-26 (GR)
B-18 (B)

3 2 1 M
6 5 4 4 3 2 1
Female side Harness side
connector connector
AK301242AB

• Use special tool test harness (MB991658) to AK301155AB

connect connector, and measure at pick-up

harness. Connector: B-18
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage B-18 (B)
Q: Is the check result normal?
YES : Go to Step 9 . 3 2 1
NO : Go to Step 7 . 6 5 4
Female side
connector
AK301242AB
STEP 7. Connector check: B-26 alternator
connector • Check output line for short circuit.
Connector: B-26 Q: Is the check result normal?
YES : Replace alternator.
B-26 (GR) NO : Repair.

M
4 3 2 1
Harness side
connector

AK301155AB

Q: Is the check result normal?

YES : Go to Step 8 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-214 TROUBLESHOOTING

STEP 9. Perform voltage measurement at B-18 STEP 11. Check harness between B-26 (terminal
intermediate connector. No. 4) alternator connector and B-18 (terminal
No. 1) intermediate connector.
Connector: B-18
Connector: B-26

B-26 (GR)
B-18 (B)

3 2 1 M
6 5 4 4 3 2 1
Female side Harness side
connector connector
AK301242AB

• Use special tool test harness (MB991658) to AK301155AB

connect connector, and measure at pick-up

harness. Connector: B-18
• Engine: Idle after warm-up
• Transmission : Neutral <M/T> or P range <A/T>
• Radiator fan: Inactive B-18 (B)
• Voltage between terminal No. 1
and earth. 3 2 1
OK: Switching the headlamps to ON from 6 5 4
OFF causes the voltage to fall. Female side
connector
Q: Is the check result normal? AK301242AB

YES : Go to Step 5 .
• Check output line for damage.
NO : Go to Step 10 .
Q: Is the check result normal?
YES : Go to Step 12 .
STEP 10. Connector check: B-26 alternator NO : Repair.
connector
Connector: B-26

B-26 (GR)

M
4 3 2 1
Harness side
connector

AK301155AB

Q: Is the check result normal?

YES : Go to Step 11 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-215
STEP 12. Check harness between B-18 (terminal Connector: C-124
No. 1) intermediate connector and C-125 <L. H. drive vehicles>
(terminal No. 41) engine-ECU <M/T> connector or
C-124 engine-A/T-ECU <A/T> connector.
Connector: B-18

C-124 (GR)

B-18 (B) <R. H. drive vehicles>

1 2 3
4 5 6
Male side
connector
AK301154 AB
C-124 (GR)
Connector: C-125
46 45 44 43 42 41
<L. H. drive vehicles> 57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check output line for damage.

C-125 (Y)
Q: Is the check result normal?
YES : Go to Step 13 .
<R. H. drive vehicles> NO : Repair.

STEP 13. Check the trouble symptoms.

Q: Do trouble symptoms persist?
YES : Replace alternator.
NO : Intermittent malfunction (Refer to Group 00
C-125 (Y)
− How to Use troubleshooting/Inspection
Service Points P.00-6).
38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-216 TROUBLESHOOTING

Code No. P1603: Battery Back-up Line System

Battery back-up circuit

Battey

W W

Relay box 8
20 A

B-Y

C-111
11

B-Y

80 (*1) or
C-124 (*2) 66 (*2) C-129 (*1)
(MU807381) (MU801823)
41 42 43 44 45 46 Battery
47 48 49 50 51 52 53 54 55 56 57 back-up 71 72 73 74 75 76 77 78 79 80 81
58 59 60 61 62 63 64 65 66 82 83 84 85 86 87 88 89 90 9192

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301156 AB

OPERATION TROUBLE JUDGMENT

• Power is directly supplied to the engine-ECU
Check Condition
(terminal No. 80) <M/T> or engine-A/T-ECU
• Ignition switch: ON
(terminal No. 66) <A/T> from the battery.
Judgment Criterion
FUNCTION • The battery back-up line voltage 6 V or less.
• The engine-ECU <M/T> or engine-A/T-ECU
<A/T> is check the open circuit of battery back-up
line.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-217
PROBABLE CAUSE
Connector: C-124
• Open/short circuit in battery back-up line circuit or
<L. H. drive vehicles>
loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE C-124 (GR)

STEP 1. MUT-II/III diagnosis code <R. H. drive vehicles>

• Temporarily place the ignition switch in "LOCK"
(OFF) position, and 10 seconds after that, place it
in "ON" position again.
Q: Is the diagnosis code P1603 set?
YES : Go to Step 2 .
NO : Intermittent malfunction (Refer to GROUP C-124 (GR)
00 − How to use Troubleshooting/Inspection
46 45 44 43 42 41
Service Points P.00-6). 57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

STEP 2. Perform voltage measurement at C-129 AK301112 AB
engine-ECU <M/T> connector or C-124 • Disconnect connector, and measure at harness
engine-A/T-ECU <A/T> connector. side.
Connector: C-129 • Ignition switch: ON
<L. H. drive vehicles> • Voltage between terminal No. 80 <M/T> or
terminal No. 66 <A/T> and earth.
OK: System voltage
Q: Is the check result normal?
C-129 (Y) YES : Go to Step 3 .
NO : Check intermediate connector C-111, and
repair if necessary. If intermediate
<R. H. drive vehicles> connector is normal, check and repair
harness between battery and C-129
(terminal No. 80) engine-ECU <M/T>
connector or C-124 (terminal No. 66)
engine-A/T-ECU <A/T> connector.
C-129 (Y)
• Check power supply line for
open/short circuit.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-218 TROUBLESHOOTING

STEP 3. Connector check: C-129 engine-ECU STEP 4. Check the trouble symptoms.
<M/T> connector or C-124 engine-A/T-ECU <A/T> Q: Does trouble symptom persist?
connector YES : Replace engine-ECU <M/T> or
Connector: C-129 engine-A/T-ECU <A/T>.
<L. H. drive vehicles> NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service PointsP.00-6).

C-129 (Y)

<R. H. drive vehicles>

C-129 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 4 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-219
INSPECTION CHART FOR TROUBLE SYMPTOMS
M1131151500674

Items Trouble symptom Inspection

procedure
No.
Communication Communication with all system is not possible 1
with MUT-II/III is Communication with engine-ECU <M/T> or engine-A/T-ECU <A/T> only 2
impossible is not possible
Engine warning The engine warning lamp does not illuminate right after the ignition switch 3
lamp is turned to the "ON" position
The engine warning lamp remains illuminating and never goes out 4
Starting Starting impossible The starter is impossible to operate. 5
(No initial combustion)
Starting impossible The starter is operative and cranks 6
(Starter operative but no initial the engine, but none of initial
combustion) combustion is in the cylinders and
the engine is not started.
Starting impossible The initial combustion occurs, but 7
(Initial combustion but no complete the engine stalls soon due to the
combustion) incomplete combustion.
Improper starting It is long cranking to start the engine.
(Long time to start)
Improper idling Unstable idling The engine speed is not constant 8
(Rough idling, hunting) and changeable during the idling.
Usually, the judgment can be based
on the movement of the tachometer
pointer, also on the vibration
transmitted to the steering wheel, sift
lever, vehicle body and so on.
Improper idling speed (Too high or The proper idling speed is not
too low) satisfied.
Engine stalls during idling The engine stalls during the idling in
(Die out) no relation to the vehicle movement.
Engine stalls The engine stalls when starting the The engine stalls during the 9
car operation, or when the accelerator
(Pass out) pedal is depressed from the idling.
The engine stalls when The engine stalls at the deceleration. 10
decelerating
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-220 TROUBLESHOOTING

Items Trouble symptom Inspection

procedure
No.
Driving Engine does not revolve up The engine speed is not higher when 11
the accelerator pedal is depressed.
Hesitation, sag The response of vehicle speed 12
(engine speed) is delayed when the
accelerator pedal is depressed, or
the vehicle speed (engine speed) is
temporarily dropped during the
acceleration. These phenomena are
called "hesitation" and the serious
hesitation is called "sag".
Poor acceleration The engine cannot obtain the
acceleration corresponding to the
degree of throttle opening although
the engine is smooth at the constant
speed.
Stumble The engine speed increase is
delayed when the accelerator pedal
is initially depressed at the starting.
Surge The vehicle body is repeated to
vibrate jollity in the forward and
backward directions at the constant
speed or acceleration.
The feeling of impact or vibration The large impact feeling occurs at 13
when accelerating the acceleration.
The feeling of impact or vibration The large impact feeling occurs at 14
when decelerating the deceleration.
Knocking Sharp sound like a hammer striking 15
on the cylinder walls during the
driving can be heard and wrongly
affects the driving.
Ignition timing offset The basic ignition timing is deviated 16
from the datum value.
Stopping Run on (Dieseling) The engine continues to run after the 17
ignition switch is in "LOCK (OFF)"
position.
Exhaust gas Odor, white smoke, black smoke, The exhaust gas is extremely rank 18
and high-concentration CO/HC odor, white smoke or black smoke.
during idling The concentration of CO & HC is
high during the idling.
Charging Battery rundown The battery is soon rundown or the 19
performance charging ability of battery is small.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-221
Items Trouble symptom Inspection
procedure
No.
Cooling Overheating The temperature of engine cooling 20
performance water is extremely high.
Abnormal rotation of fan motor The fan motor is abnormally rotated 21
when the ignition switch is in "ON"
position in no relation to the engine
cooling water temperature.
A/C performance Poor A/C performance The temperature of air cooling from 22
A/C is not efficient or very far from
the target temperature.
PROBLEM SYMPTOMS TABLE
Inspection Trouble symptom Reference
procedure page
No.
1 Communication with all system is not possible P.13A-223
2 Communication with engine-ECU only is not possible P.13A-226
3 The engine warning lamp does not illuminate right after the ignition switch is P.13A-229
turned to the "ON" position
4 The engine warning lamp remains illuminating and never goes out P.13A-238
5 Starting impossible (No initial combustion) P.13A-241
<M/T>,
P.13A-248
<A/T>
6 Starting impossible (Starter operative but no initial combustion) P.13A-255
<M/T>,
P.13A-258
<A/T>
7 Starting impossible (Initial combustion but no complete combustion) P.13A-261
Improper starting (Long time to start)
8 Unstable idling (Rough idling, hunting) P.13A-265
Improper idling speed (Too high or too low)
Engine stalls during idling (Die out)
9 The engine stalls when starting the car (Pass out) P.13A-276
10 The engine stalls when decelerating P.13A-277
11 Engine does not revolve up P.13A-280
12 Hesitation, sag P.13A-282
Poor acceleration
Stumble
Surge
13 The feeling of impact or vibration when accelerating P.13A-285
14 The feeling of impact or vibration when decelerating P.13A-287
15 Knocking P.13A-287
16 Ignition timing offset P.13A-289
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-222 TROUBLESHOOTING

Inspection Trouble symptom Reference

procedure page
No.
17 Run on (Dieseling) P.13A-291
18 Odor, white smoke, black smoke, and high-concentration CO/HC during idling P.13A-291
19 Battery rundown P.13A-293
20 Overheating P.13A-299
21 Abnormal rotation of fan motor P.13A-300
22 Poor A/C performance P.13A-305
23 Engine-ECU<M/T> or engine-A/T-ECU<A/T> power supply, engine control P.13A-307
relay, ignition switch-IG1 system
24 Fuel pump system P.13A-319
25 Fan control relay system P.13A-329
26 A/C system P.13A-337
27 A/C load signal system P.13A-341
28 Ignition circuit system <L.H. drive vehicles> P.13A-346
29 Ignition circuit system <R.H. drive vehicles> P.13A-353
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-223
SYMPTOM PROCEDURES

Inspection Procedure 1: Communication with All System is not Possible

Diagnosis connector circuit

Fusible link (1)

W-R
C-21 (*1) or
C-121 (*2)
1
W-R

C-138 (*2)
1

W-R
C-211
1
15 J/B
15 A
12
C-212

G-R (*1) or
W (*2)

C-11 16
1 2 3 4 5 6 7 8
Diagnosis connector
9 10 1112 13 14 1516
4 5

B B

NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301341 AB

OPERATION COMMENT ON TROUBLE SYMPTOM

• Battery voltage is applied to diagnosis connector • Failure is possibly caused by failed power supply
(terminal No.16). circuit or failed earthing circuit of diagnosis
• Diagnosis connector (terminals No. 4 and 5) are connector.
earthed to the vehicle body.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-224 TROUBLESHOOTING

PROBABLE CAUSE STEP 3. Perform voltage measurement at C-11

• Failed diagnosis connector diagnosis connector.
• Open/short circuit in diagnosis connector circuit
• Failed MUT-II/III Connector: C-11 1 2 3 4 5 6 7 8
9 10 1112 13 14 1516
DIAGNOSIS PROCEDURE Harness side connector
NOTE: .
*1: L.H. drive vehicles
*2: R.H. drive vehicles
C-11 (B)
STEP 1. Check connector: C-11 diagnosis
connector AK301342 AB

Connector: C-11 1 2 3 4 5 6 7 8 • Disconnect connector, and measure at the

9 10 1112 13 14 1516 harness side.
• Voltage between terminal No. 16 and earth.
Harness side connector
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4 .
C-11 (B)
NO : Check intermediate connectors C-21*1 or
C-121*2, C-138*2, C-211 and C-212, and
AK301342 AB
repair if necessary. If connectors are
normal, check and repair harness between
Q: Is the check result normal? C-24 (terminal No. 16) diagnosis connector
YES : Go to Step 2 . and battery.
NO : Repair. • Check power supply line for
open/short circuit.
STEP 2. Perform resistance measurement at C-11
diagnosis connector. STEP 4. Replace MUT-II/III.
• After replacing the MUT-II/III, re-check the trouble
Connector: C-11 1 2 3 4 5 6 7 8
9 10 1112 13 14 1516 symptoms.

Harness side connector Q: Does trouble symptom persist?

YES : Go to Step 5 .
NO : Check end

C-11 (B)

AK301342 AB

• Disconnect connector, and measure at harness

side.
• Resistance between terminal No. 4 and earth,
also between terminal No. 5 and earth.
OK: 2 Ω or less
Q: Is the check result normal?
YES : Go to Step 3 .
NO : Check and repair harness between C-11
(terminal No. 4) diagnosis connector and
body earth, also between C-11 (terminal No.
5) diagnosis connector and body earth.
• Check earthing line for open circuit
and damage.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-225
STEP 5. Check harness between C-11 (terminal
No. 16) diagnosis connector and battery.
Connector: C-11 1 2 3 4 5 6 7 8
9 10 1112 13 14 1516

Harness side connector

C-11 (B)

AK301342 AB

NOTE: Before checking harness, check intermediate

connectors C-21*1 or C-121*2, C-138*2, C-211 and
C-212, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Check and repair harness between C-11
(terminal No. 4 and No. 5) diagnosis
connector and body earth.
• Check earthing line for damage.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-226 TROUBLESHOOTING

Inspection Procedure 2: Communication with Engine-ECU <M/T> or Engine-A/T-ECU <A/T>Only is Not

Possible.

Diagnosis connector circuit

C-127 (*1)
(MU801820)
Engine-ECU <M/T>
51 52 53 54 55 56 or
57 58 59 60 61 62 Engine-A/T-ECU <A/T>
C-126 (*2)
(MU803782) 62 (*1) or
71 72 73 74 75 76 77 85 (*2)
78 79 80 81 8283 8485 8687 88 89
90 91 92 93 94 9596 97 98
O

C-13 (*3) or
C-137 (*4)
23

14
J/C (4)
C-32
15

O
C-11 7
1 2 3 4 5 6 7 8
Diagnosis connector
9 10 1112 13 14 1516

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301343 AB

OPERATION PROBABLE CAUSE

• There is data communication between diagnosis • Open/short circuit in engine-ECU <M/T> or
connector output terminal (terminal No. 7) and engine-A/T-ECU <A/T> power circuit
engine-ECU (terminal No. 62) <M/T> or • Short circuit in diagnosis connector circuit
engine-A/T-ECU (terminal No. 85) <A/T>. • Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by failed power supply
circuit or failed earthing circuit of engine-ECU
<M/T> or engine-A/T-ECU <A/T>.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-227
DIAGNOSIS PROCEDURE STEP 2. Connector check: C-127 engine-ECU
NOTE: . <M/T> connector or C-126 engine-A/T-ECU <A/T>
*1: L.H. drive vehicles connector
*2: R.H. drive vehicles Connector: C-127
<L. H. drive vehicles>
STEP 1. Check engine warning lamp.
• Ignition switch: OFF → ON
Q: Is lamp illuminating for few seconds?
YES : Go to Step 2 . C-127 (Y)
NO : Check engine-ECU <M/T> or
engine-A/T-ECU <A/T> power supply,
engine control relay and ignition switch IG1 <R. H. drive vehicles>
system (Refer to Inspection Procedure 23
P.13A-307).

C-127 (Y)

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301126AB

Connector: C-126
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

Q: Is the check result normal?

YES : Go to Step 3 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-228 TROUBLESHOOTING

STEP 3. Check harness between C-11 (terminal Connector: C-126

No. 7) diagnosis connector and C-127 (terminal <L. H. drive vehicles>
No. 62) engine-ECU <M/T> connector or C-126
(terminal No. 85) engine-A/T-ECU <A/T>
connector.
Connector: C-11 1 2 3 4 5 6 7 8 C-126 (GR)
9 10 1112 13 14 1516

Harness side connector

<R. H. drive vehicles>

C-11 (B)

AK301342 AB C-126 (GR)

Connector: C-127 77 76 75 74 73 72 71
<L. H. drive vehicles> 89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

NOTE: Before Checking harness, check

C-127 (Y) intermediate connectors C-13*1 or C-137 *2 and
C-32, and repair if necessary.
• Check communication line for open/short circuit
<R. H. drive vehicles> and damage.
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Repair or replace.

C-127 (Y)
STEP 4. Check the trouble symptom.
Q: Does trouble symptom persist?
8180 79 78 77 76 75 74 73 72 71 YES : Replace engine-ECU <M/T> or
92 91 90 89 88 87 86 85 84 83 82 engine-A/T-ECU <A/T>.
Harness side connector NO : Intermittent malfunction (Refer to GROUP
AK301126AB
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-229

Inspection Procedure 3: The Engine Warning Lamp Does Not Illuminate Right after the Ignition Switch
Is Turned to the "ON" Position

Engine warning lamp (check engine lamp) circuit

Ignition switch
C-201

R LOCK
1 2 3
ST ACC
4 5 6
IG1 IG2

2
B-W
C-210
6

2 J/B
7.5 A

25
C-212
*3 *4

Y-R
15
J/C (5)
C-03 O
13
Y-R

Check C-04
engine
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Engine warning lamp

17 (check engine lamp)

W-L

9
C-13 (*3) or
C-125 (*1) C-137 (*4)
(MU801822) W-L
36 (*1) or
31 32 33 34 35 36 37 38
22 (*2)
39 40 41 42 43 44 45 46

C-122 (*2) Engine-ECU <M/T>

(MU803784) or
1 2 3 4 5 6 7 8
Engine-A/T-ECU <A/T>
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 3132 33 34 35

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301344 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-230 TROUBLESHOOTING

OPERATION STEP 2. Check engine warning lamp for

• Battery voltage is applied to engine warning lamp burnt-out bulb.
of combination meter connector (terminal No. 9)
from ignition switch. Q: Is the check result normal?
• Engine-ECU (terminal No. 36) <M/T> or YES : Go to Step 3 .
engine-A/T-ECU (terminal No. 22) <A/T> makes NO : Replace engine warning lamp.
power transistor in unit be in "ON" position, and
that makes currents go on engine warning lamp STEP 3. Connector check: C-04 combination
of combination meter connector (terminal No. meter connector
17).
Connector: C-04
COMMENTS ON TROUBLE SYMPTOM <L. H. drive vehicles>
• Engine-ECU <M/T> or engine-A/T-ECU <A/T>
turns on engine warning lamp for 5 seconds to C-04
check for burnt-out bulb immediately after ignition
switch is turned to ON.
• If engine warning lamp is not lit just after turning
ignition switch to "ON" position, failure is possibly
caused by burn-out bulb, open/short circuit or
other faults.

PROBABLE CAUSE
• Engine warming lamp bulb burnt out
• Failed ignition switch
• Open/short circuit in engine warning lamp circuit <R. H. drive vehicles>
for or loose connector contact
• Failed engine-ECU <M/T> C-04
• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE
NOTE: .
*1: L.H. drive vehicles
*2: R.H. drive vehicles

STEP 1. Check engine start-up.

Q: Is engine started?
YES : Go to Step 2 . 21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

NO : Check engine-ECU <M/T> or Harness side connector

engine-A/T-ECU <A/T> power supply, AK301345 AB
engine control relay and ignition switch IG-1
system (Refer to Inspection Procedure 23 Q: Is the check result normal?
P.13A-307). YES : Go to Step 4 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-231
STEP 4. Perform voltage measurement at C-04 STEP 5. Connector check: C-201 ignition switch
combination meter connector. connector
Connector: C-04 Connector: C-201
<L. H. drive vehicles> <L. H. drive vehicles>

C-04

C-201

<R. H. drive vehicles>

<R. H. drive vehicles>

C-201
C-04

3 2 1
6 5 4
Harness side connector
AK301346 AB
21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Harness side connector

AK301345 AB

• Disconnect connector, and measure at the

harness side.
• Ignition switch: ON
• Voltage between terminal No. 9 and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 6 .
NO : Go to Step 5 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-232 TROUBLESHOOTING

Connector: C-04 STEP 6. Connector check: C-125 engine-ECU

<L. H. drive vehicles> <M/T> connector or C-122 engine-A/T-ECU <A/T>
connector
C-04 Connector: C-125
<L. H. drive vehicles>

C-125 (Y)

<R. H. drive vehicles>

<R. H. drive vehicles>

C-04

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-122
<L. H. drive vehicles>

21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Harness side connector

AK301345 AB
C-122 (GR)
Q: Is the check result normal?
YES : Check intermediate connectors C-03*1,
<R. H. drive vehicles>
C-210 and C-212, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between C-04 (terminal
No. 9) combination meter connector and
C-201 (terminal No. 2) ignition switch
connector.
C-122 (GR)
• Check power supply line for
open/short circuit. 77 76 75 74 73 72 71
NO : Repair or replace. 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-233
STEP 7. Perform voltage measurement at C-125 STEP 8. Check connector: C-04 combination
engine-ECU <M/T> connector or C-122 meter connector
engine-A/T-ECU <A/T> connector. Connector: C-04
Connector: C-125 <L. H. drive vehicles>
<L. H. drive vehicles>

C-04

C-125 (Y)

<R. H. drive vehicles>

<R. H. drive vehicles>

C-125 (Y)
C-04
38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-122
<L. H. drive vehicles>

21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1
C-122 (GR)
Harness side connector
AK301345 AB
<R. H. drive vehicles>
Connector: C-125
<L. H. drive vehicles>

C-122 (GR)
C-125 (Y)
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
<R. H. drive vehicles>
Harness side connector
AK301123 AB

• Disconnect connector, and measure at the

harness side.
• Ignition switch: ON
• Voltage between terminal No. 36 <M/T> or
C-125 (Y)
terminal No. 22 <A/T> and earth.
OK: System voltage
38 37 36 35 34 33 32 31
Q: Is the check result normal? 46 45 44 43 42 41 40 39
YES : Go to Step 9 . Harness side connector
AK301135 AB
NO : Go to Step 8 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-234 TROUBLESHOOTING

Connector: C-122 STEP 9. Connector check: C-201 ignition switch

<L. H. drive vehicles> connector
Connector: C-201
<L. H. drive vehicles>

C-122 (GR)

C-201
<R. H. drive vehicles>

C-122 (GR) <R. H. drive vehicles>

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector C-201
AK301123 AB

Q: Is the check result normal?

YES : Check intermediate connector C-13*1 or
C-137*2, and repair if necessary. If
intermediate connector is normal, check and
repair harness between C-04 (terminal No.
17) combination meter connector and C-125 3 2 1
(terminal No. 36) engine-ECU <M/T> 6 5 4
connector or C-122 (terminal No. 22) Harness side connector
engine-A/T-ECU <A/T> connector. AK301346 AB
• Check output line for open/short
circuit. Q: Is the check result normal?
NO : Repair or replace. YES : Go to Step 10 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-235
STEP 10. Check harness between C-04 (terminal Connector: C-201
No. 9) combination connector and C-201 <L. H. drive vehicles>
(terminal No. 2) ignition switch connector.
Connector: C-04
<L. H. drive vehicles>
C-201

C-04

<R. H. drive vehicles>

C-201

<R. H. drive vehicles>

C-04

3 2 1
6 5 4
Harness side connector
AK301346 AB

NOTE: Before checking harness, check intermediate

connectors C-212, C-03*1 and C-210, and repair if
21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 necessary.
Harness side connector
• Check power supply line for damage.
AK301345 AB Q: Is the check result normal?
YES : Go to Step 11 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-236 TROUBLESHOOTING

STEP 11. Check harness between C-04 (terminal Connector: C-125

No. 17) combination connector and C-125 <L. H. drive vehicles>
(terminal No. 36) engine-ECU <M/T> or C-122
(terminal No. 22) engine-A/T-ECU <A/T>
connector.
Connector: C-04
C-125 (Y)
<L. H. drive vehicles>

<R. H. drive vehicles>

C-04

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
<R. H. drive vehicles>
Connector: C-122
C-04 <L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Harness side connector

AK301345 AB
C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

NOTE: Before checking harness, check intermediate

connector C-13*1 or C-137*2, and repair if necessary.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 12 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-237
STEP 12. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-238 TROUBLESHOOTING

Inspection Procedure 4: The Engine Warning Lamp Remains Illuminating and Never Goes Out

Engine warning lamp (check engine lamp) circuit

Ignition switch
C-201

R LOCK
1 2 3
ST ACC
4 5 6
IG1 IG2

2
B-W
C-210
6

2 J/B
7.5 A

25
C-212
*3 *4

Y-R
15
J/C (5)
C-03 O
13
Y-R

Check C-04
engine
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21

Engine warning lamp

17 (check engine lamp)

W-L

9
C-13 (*3) or
C-125 (*1) C-137 (*4)
(MU801822) W-L
36 (*1) or
31 32 33 34 35 36 37 38
22 (*2)
39 40 41 42 43 44 45 46

C-122 (*2) Engine-ECU <M/T>

(MU803784) or
1 2 3 4 5 6 7 8
Engine-A/T-ECU <A/T>
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 3132 33 34 35

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301344 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-239
OPERATION STEP 2. Connector check: C-125 engine-ECU
• Battery voltage is applied to engine warning lamp <M/T> connector or C-122 engine-A/T-ECU <A/T>
(terminal No. 9) from ignition switch. connector
• Engine-ECU (terminal No. 36) <M/T> or
engine-A/T-ECU (terminal No. 22) <A/T> makes Connector: C-125
power transistor in unit be in "ON" position, and <L. H. drive vehicles>
that makes currents go on engine warning lamp
(terminal No. 17).

COMMENT ON TROUBLE SYMPTOM

• Engine-ECU <M/T> or engine-A/T-ECU <A/T> C-125 (Y)
has detected failed sensor or failed actuator. Or
failure is possibly caused by short circuit or other <R. H. drive vehicles>
faults.

PROBABLE CAUSE
• Short circuit in engine warning lamp circuit.
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
C-125 (Y)

DIAGNOSIS PROCEDURE
38 37 36 35 34 33 32 31
NOTE: . 46 45 44 43 42 41 40 39
*1: L.H. drive vehicles Harness side connector
*2: R.H. drive vehicles AK301135 AB

Connector: C-122
STEP 1. MUT-II/III diagnosis code <L. H. drive vehicles>
Q: Diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-16.)
NO : Go to Step 2 .
C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 3 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-240 TROUBLESHOOTING

STEP 3. Perform voltage measurement at C-125 Connector: C-04

engine-ECU <M/T> or C-122 engine-A/T-ECU <L. H. drive vehicles>
<A/T> connector.
Connector: C-125 C-04
<L. H. drive vehicles>

C-125 (Y)

<R. H. drive vehicles>

<R. H. drive vehicles>

C-04

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-122
<L. H. drive vehicles>

21 20 19 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1

Harness side connector

AK301345 AB
C-122 (GR)
• Disconnect connector, and measure at the
harness side.
<R. H. drive vehicles> • Ignition switch: ON
• Voltage between terminal No. 36 <M/T> or
terminal No. 22 <A/T> and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 4 .
C-122 (GR)
NO : Check intermediate connector C-13*1 or
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
C-137*2, and repair if necessary. If
100 99 98 97 96 95 94 93 92 91 intermediate connector is normal, check and
Harness side connector repair harness between C-04 (terminal No.
AK301123 AB
17) combination meter connector and C-125
(terminal No. 36) engine-ECU <M/T>
connector or C-122 (terminal No. 22)
engine-A/T-ECU <A/T> connector.
• Check output line for short circuit.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-241
YES : Replace engine-ECU <M/T> or
STEP 4. Check the trouble symptoms.
engine-A/T-ECU <A/T>.
Q: Does trouble symptom persist? NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).

Inspection Procedure 5: Starting Impossible (No Initial Combustion) <M/T>

Stating impossible (no initial combustion)

Ignition switch
C-201
R LOCK
1 2 3
ST ACC
IG1 IG2 4 5 6
Battery
5

B-Y
C-14 (*1) or
C-136 (*2)
7

B-Y (*1) or
B-R (*2)

B-R

B-Y (*1) or
B-R (*2)
B-Y
B-18
3 C-129
71 (MU801823)

B-R 71 72 73 74 75 76 77 78 79 80 81
82 83 84 85 86 87 88 89 90 9192
Starter 1 1
B-23 Engine-ECU
B-22 (MU801211)
ON
OFF
1 1
M

NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301347 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-242 TROUBLESHOOTING

OPREATION STEP 2. MUT-II/III data list

• If the ignition switch is turned to "START" • Refer to data list reference table P.13A-361.
position, battery voltage is applied to starter a. Item 18: Cranking signal
(terminal No.1).
• If the ignition switch is turned to "START" OK:
position, battery voltage is applied to engine-ECU ON (Ignition switch: ST)
(terminal No.71) from ignition switch. Because of OFF (Ignition switch: ON)
this, engine-ECU detects that the engine is Q: Is the check result normal?
cranked. YES : Go to Step 8 .
NO : Go to Step 3 .
COMMENT ON TROUBLE SYMPTOM
• Failure is possibly caused by failed starter itself
STEP 3. Connector check: C-129 engine-ECU
or failed related circuit.
connector
PROBABLE CAUSE Connector: C-129
• Failed battery <L. H. drive vehicles>
• Failed starter motor
• Open/short circuit in starter associated circuit or
loose connector contact
C-129 (Y)
DIAGNOSIS PROCEDURE
NOTE: .
*1: L.H. drive vehicles <R. H. drive vehicles>
*2: R.H. drive vehicles

STEP 1. Check battery voltage.

• Measure battery voltage at cranking.
OK: 8 V or higher C-129 (Y)
Q: Is the check result normal?
YES : Go to Step 2 .
NO : Check battery (Refer to GROUP 54A − 8180 79 78 77 76 75 74 73 72 71

Battery − On-vehicle Service − Battery Test 92 91 90 89 88 87 86 85 84 83 82

Harness side connector
P.54A-5). AK301111AB

Q: Is the check result normal?

YES : Go to Step 4 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-243
STEP 4. Perform voltage measurement at C-129 STEP 5. Connector check: C-201 ignition switch
engine-ECU connector. connector
Connector: C-129 Connector: C-201
<L. H. drive vehicles>
<L. H. drive vehicles>

C-129 (Y) C-201

<R. H. drive vehicles>

<R. H. drive vehicles>

C-129 (Y)

C-201
8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB

• Disconnect connector, and measure at the

harness side.
• Ignition switch: ST
• Voltage between terminal No. 71 and earth. 3 2 1
OK: System voltage 6 5 4
Harness side connector
Q: Is the check result normal?
AK301346 AB
YES : Go to Step 7 .
NO : Go to Step 5 . Q: Is the check result normal?
YES : Go to Step 6 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-244 TROUBLESHOOTING

Q: Is the check result normal?

STEP 6. Check ignition switch.
YES : Check intermediate connectors C-14*1,
Connector: C-129 C-136*2, and repair if necessary. If
<L. H. drive vehicles>
intermediate connector are normal, check
and repair harness between C-129 (terminal
No. 71) inhibitor switch connector and
C-201 (terminal No. 5) ignition switch
C-129 (Y) connector.
• Check power supply line for
open/short circuit.
<R. H. drive vehicles> NO : Replace ignition switch.

STEP 7. Connector check: C-201 ignition switch

connector and B-23 starter connector
Connector: C-201
C-129 (Y)
<L. H. drive vehicles>

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector C-201
AK301111AB

Connector: C-201
<L. H. drive vehicles>

<R. H. drive vehicles>

C-201

C-201

<R. H. drive vehicles>

C-201 3 2 1
6 5 4
Harness side connector
AK301346 AB

Connector: B-23

3 2 1
6 5 4
Harness side connector
AK301346 AB
1
B-23 (B)
• Check ignition switch (Refer to GROUP 54A − Harness side
connector
Ignition Switch − Ignition Switch P.54A-29).
AK301348 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-245
Q: Is the check result normal?
STEP 10. Connector check: C-201 ignition switch
YES : Check intermediate connectors C-14*1,
connector
C-136*2 and B-18, and repair if necessary. If
intermediate connectors are normal, check Connector: C-201
and repair harness between C-201 (terminal <L. H. drive vehicles>
No. 5) ignition switch connector and B-23
(terminal No. 1) starter connector.
• Check output line for short circuit.
NO : Repair or replace. C-201

STEP 8. Check connector: B-23 starter connector

Connector: B-23

<R. H. drive vehicles>

1
B-23 (B)
Harness side C-201
connector

AK301348 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.

3 2 1
STEP 9. Perform voltage measurement at B-23 6 5 4
starter connector. Harness side connector
AK301346 AB
Connector: B-23

Connector: B-23

1
B-23 (B)
Harness side 1
connector B-23 (B)
Harness side
AK301348 AB connector

• Disconnect connector, and measure at the AK301348 AB

harness side.
• Ignition switch: ST Q: Is the check result normal?
• Voltage between terminal No. 1 and earth. YES : Check intermediate connectors C-14*1,
OK: System voltage C-136*2 and B-18, and repair if necessary. If
intermediate connectors are normal, check
Q: Is the check result normal? and repair harness between C-201 (terminal
YES : Go to Step 11 .
No. 5) ignition switch connector and B-23
NO : Go to Step 10 .
(terminal No. 1) starter connector.
• Check output line for open circuit and
damage.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-246 TROUBLESHOOTING

STEP 11. Connector check: B-23 starter STEP 13. Check harness between C-201 (terminal
connector No. 5) ignition switch connector and B-23
(terminal No. 1) starter connector.
Connector: B-23
Connector: C-201
<L. H. drive vehicles>

1
B-23 (B) C-201
Harness side
connector

AK301348 AB

Q: Is the check result normal?

YES : Go to Step 12 .
NO : Repair or replace. <R. H. drive vehicles>

STEP 12. Perform voltage measurement at B-23

starter connector.
C-201
Connector: B-23

1
B-23 (B)
Harness side 3 2 1
connector 6 5 4
Harness side connector
AK301348 AB
AK301346 AB
• Disconnect connector, and measure at the
harness side. Connector: B-23
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 13 .
NO : Check and repair harness between B-22 1
B-23 (B)
(terminal No. 1) starter connector and Harness side
battery. connector
• Check power supply line for
AK301348 AB
open/short circuit.
NOTE: Before checking harness, check intermediate
connectors B-18 and C-14*1, C-136*2, and repair if
necessary.
• Check output line for damage.
Q: Is the check result normal?
YES : Go to Step 14 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-247
STEP 14. Check harness between B-22 (terminal
No. 1) starter connector and battery.
Connector: B-22

1
Harness side B-22
connector

AK301349AB

• Check power supply line for damage.

Q: Is the check result normal?
YES : Replace starter.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-248 TROUBLESHOOTING

Inspection Procedure 5: Starting Impossible (No Initial Combustion) <A/T>

Stating impossible (no initial combustion)

Ignition switch
C-201
R LOCK
1 2 3
ST ACC
IG1 IG2 4 5 6
Battery
5
B-Y C-14 (*1) or
C-136 (*2)
7
B-Y
10 B-20
(MU802355)

Inhibitor
switch P 1 2 3 4 5 6
D 7 8 9 10
N R

B-R 9
B-R

B-R
B-R
B-18
3 C-124
58 (MU803781)
41 42 43 44 45 46
B-R 47 48 49 50 51 52 53 54 55 56 57
58 59 60 61 62 63 64 65 66
Starter 1 1
B-23 Engine-A/T-ECU
B-22 (MU801211)
ON
OFF
1 1
M

NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301351 AB

OPREATION • If the ignition switch is turned to "START"

• If the ignition switch is turned to "START" position, battery voltage is applied to
position, battery voltage is applied to starter engine-A/T-ECU(terminal No.58) from ignition
(terminal No.1). switch. Because of this, engine-A/T-ECU detects
that the engine is cranked.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-249
COMMENT ON TROUBLE SYMPTOM STEP 3. Connector check: B-20 inhibitor switch
• Failure is possibly caused by failed starter itself connector
or failed related circuit.
Connector: B-20
PROBABLE CAUSE
6 5 4 3 2 1
• Failed battery 10 9 8 7
• Failed starter motor
Harness side
• Open/short circuit in starter associated circuit or connector
loose connector contact
• Failed inhibitor switch B-20 (B)

DIAGNOSIS PROCEDURE
NOTE: . AK301350AB
*1: L.H. drive vehicles
*2: R.H. drive vehicles Q: Is the check result normal?
YES : Go to Step 4 .
NO : Repair.
STEP 1. Check battery voltage.
• Measure battery voltage at cranking.
STEP 4. Perform voltage measurement at B-20
OK: 8 V or higher inhibitor switch connector.
Q: Is the check result normal?
YES : Go to Step 2 . Connector: B-20
NO : Check battery (Refer to GROUP 54A − 6 5 4 3 2 1
Battery − On-vehicle Service − Battery Test 10 9 8 7
P.54A-5). Harness side
connector

STEP 2. MUT-II/III data list B-20 (B)

• Refer to data list reference table P.13A-361.
a. Item 18: Cranking signal
OK: AK301350AB
ON (Ignition switch: ST)
OFF (Ignition switch: ON) • Disconnect connector, and measure at the
harness side.
Q: Is the check result normal? • Ignition switch: ST
YES : Go to Step 12 . • Voltage between terminal No. 10 and earth.
NO : Go to Step 3 .
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 7 .
NO : Go to Step 5 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-250 TROUBLESHOOTING

STEP 5. Connector check: C-201 ignition switch STEP 6. Check ignition switch.
connector
Connector: B-20
Connector: C-201
6 5 4 3 2 1
<L. H. drive vehicles> 10 9 8 7
Harness side
connector

C-201 B-20 (B)

AK301350AB

Connector: C-201
<L. H. drive vehicles>
<R. H. drive vehicles>

C-201
C-201

<R. H. drive vehicles>

3 2 1
6 5 4
Harness side connector
C-201
AK301346 AB

Q: Is the check result normal?

YES : Go to Step 6 .
NO : Repair or replace.

3 2 1
6 5 4
Harness side connector
AK301346 AB

• Check ignition switch (Refer to GROUP 54A −

Ignition Switch − Ignition Switch P.54A-29).
Q: Is the check result normal?
YES : Check intermediate connector C-14*1,
C-136*2, and repair if necessary. If
intermediate connector is normal, check and
repair harness between B-20 (terminal No.
10) inhibitor switch connector and C-201
(terminal No. 5) ignition switch connector.
• Check power supply line for
open/short circuit.
NO : Replace ignition switch.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-251
Q: Is the check result normal?
STEP 7. Check inhibitor switch.
YES : Go to Step 10 .
• Check inhibitor switch (Refer to GROUP 23A − NO : Repair.
On-vehicle Service − Essential Service
P.23A-127).
STEP 10. Check harness between B-18 (terminal
Q: Is the check result normal?
No. 3) intermediate connector and B-23 (terminal
YES : Go to Step 8 .
No. 1) starter connector.
NO : Replace inhibitor switch.
Connector: B-18

STEP 8. Connector check: B-18 intermediate

connector
Connector: B-18 B-18 (B)

1 2 3
4 5 6
B-18 (B)
Male side
connector
AK301154 AB
1 2 3
4 5 6
Connector: B-23
Male side
connector
AK301154 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace. 1
B-23 (B)
Harness side
connector
STEP 9. Check harness between B-20 (terminal
No. 9) inhibitor switch connector and B-18 AK301348 AB
(terminal No. 3) intermediate connector.
• Check output line for open/short circuit.
Connector: B-20 Q: Is the check result normal?
6 5 4 3 2 1 YES : Go to Step 11 .
10 9 8 7 NO : Repair.
Harness side
connector

B-20 (B)

AK301350AB

Connector: B-18

B-18 (B)

1 2 3
4 5 6
Male side
connector
AK301154 AB

• Check output line for open/short circuit.

 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-252 TROUBLESHOOTING

STEP 11. Connector check: C-124 STEP 12. Connector check: B-23 starter
engine-A/T-ECU connector connector
Connector: C-124 Connector: B-23
<L. H. drive vehicles>

C-124 (GR) 1
B-23 (B)
Harness side
connector
<R. H. drive vehicles>
AK301348 AB

Q: Is the check result normal?

YES : Go to Step 13 .
NO : Repair or replace.

C-124 (GR)
STEP 13. Perform voltage measurement at B-23
46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
starter connector.
66 65 64 63 62 61 60 59 58
Connector: B-23
Harness side connector
AK301112 AB

Connector: B-18

1
B-23 (B)
B-18 (B)
Harness side
connector
1 2 3
AK301348 AB
4 5 6
Male side Connector: B-20
connector
AK301154 AB
6 5 4 3 2 1
10 9 8 7
Q: Is the check result normal?
YES : Check and repair harness between B-18 Harness side
connector
(terminal No. 3) intermediate connector and
C-124 (terminal No. 58) engine-A/T-ECU B-20 (B)
connector.
• Check output line for open/short
circuit.
AK301350AB
NO : Repair or replace.
• Disconnect connector, and measure at the
harness side.
• Ignition switch: ST
• Voltage between terminal No. 1 and earth.
OK:
System voltage (Selector lever position: P or
N)
1 V or less (Selector lever position: Other than
P or N)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-253
Q: Is the check result normal? Q: Is the check result normal?
YES : Go to Step 14 . YES : Go to Step 16 .
NO : Check intermediate connector B-18, and NO : Check and repair harness between B-22
repair if necessary. If intermediate (terminal No. 1) starter connector and
connector is normal, check and repair battery.
harness between B-20 (terminal No. 9) • Check power supply line for
inhibitor switch connector and B-23 open/short circuit.
(terminal No. 1) starter connector.
• Check output line for open/short STEP 16. Connector check: C-201 ignition switch
circuit. connector, B-23 starter connector
Connector: C-201
STEP 14. Connector check: B-22 starter
<L. H. drive vehicles>
connector
Connector: B-22

C-201

1
Harness side B-22
connector
<R. H. drive vehicles>
AK301349AB

Q: Is the check result normal?

YES : Go to Step 15 .
NO : Repair or replace. C-201

STEP 15. Perform voltage measurement at B-22

starter connector.
Connector: B-22

3 2 1
6 5 4
Harness side connector
1 AK301346 AB

Harness side B-22

connector Connector: B-23

AK301349AB

• Disconnect connector, and measure at the

harness side.
• Voltage between terminal No. 1 and earth.
1
OK: System voltage B-23 (B)
Harness side
connector

AK301348 AB

Q: Is the check result normal?

YES : Go to Step 17 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-254 TROUBLESHOOTING

STEP 17. Check harness between C-201 (terminal STEP 18. Check harness between B-20 (terminal
No. 5) ignition switch connector and B-20 No. 9) inhibitor switch connector and B-23
(terminal No. 10) inhibitor switch connector. (terminal No. 1) starter connector.
Connector: C-201 Connector: B-20
<L. H. drive vehicles> 6 5 4 3 2 1
10 9 8 7
Harness side
connector
C-201
B-20 (B)

AK301350AB

Connector: B-23
<R. H. drive vehicles>

C-201
1
B-23 (B)
Harness side
connector

AK301348 AB

NOTE: Before checking harness, check intermediate

connector B-18, and repair if necessary.
3 2 1
• Check output line for damage.
6 5 4
Harness side connector Q: Is the check result normal?
AK301346 AB YES : Go to Step 19 .
NO : Repair.
Connector: B-20
6 5 4 3 2 1 STEP 19. Check harness between B-22 (terminal
10 9 8 7 No. 1) starter connector and battery.
Harness side
connector Connector: B-22

B-20 (B)

AK301350AB 1
NOTE: Before checking harness, check intermediate Harness side B-22
connector
connector C-14*1, C-136*2, and repair if necessary.
• Check power supply line for damage. AK301349AB

Q: Is the check result normal? • Check power supply line for damage.
YES : Go to Step 18 .
Q: Is the check result normal?
NO : Repair.
YES : Replace starter.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-255

Inspection Procedure 6: Starting Impossible (Starter Operative but No Initial Combustion) <M/T>

OPERATION STEP 4. MUT-II/III actuator test

• Refer to Inspection procedure, Ignition circuit • Refer to actuator test reference table P.13A-367.
system <L. H. drive vehicles> P.13A-346 or a. Item 07: Fuel pump
Ignition circuit system <R. H. drive vehicles>
P.13A-353 OK: Operating sound of fuel pump can be
heard.
COMMENT ON TROUBLE SYMPTOM Q: Is the check result normal?
• Failure is possibly caused by failed ignition YES : Go to Step 5 .
circuit, failed fuel feed or other faults. NO : Check fuel pump system (Refer to
Inspection Procedure 24 P.13A-319)
PROBABLE CAUSE
• Failed battery
• Timing belt broken STEP 5. Check timing belt for breakage.
• Failed idle speed control • Engine: Cranking
• Throttle valve fouled around OK: Camshaft rotates.
• Failed ignition system
Q: Is the check result normal?
• Failed fuel system YES : Go to Step 6 .
• Failed immobilizer system NO : Replace timing belt.
• Failed engine-ECU

DIAGNOSIS PROCEDURE STEP 6. Check the engine start ability.

• With depressing the accelerator pedal slightly,
NOTE: . and start the engine.
*1: L.H. drive vehicles
*2: R.H. drive vehicles Q: Is the start ability good?
YES : Go to Step 7 .
NO : Go to Step 8 .
STEP 1. Check battery voltage.
• Measure battery voltage at cranking.
STEP 7. Check idling speed control for operating
OK: 8 V or higher sound.
Q: Is the check result normal? • Check idle speed control servo for operating
YES : Go to Step 2 . sound (Refer to P.13A-394).
NO : Check battery (Refer to GROUP 54A −
Q: Is the check result normal?
Battery − On-vehicle Service − Battery test
YES : Clean throttle body (throttle valve portion)
P.54A-5).
(Refer to P.13A-383).
NO : Check idle speed control servo system
STEP 2. Check engine warning lamp for burnt out (Refer to code No. P0505 P.13A-192).
bulb.
Q: Is the check result normal? STEP 8. MUT-II/III data list
YES : Go to Step 3 . • Refer to data list reference table P.13A-361.
NO : Check engine-ECU power supply, engine a. Item 18: Cranking signal
control relay and ignition switch IG-1 system OK:
(Refer to Inspection Procedure 23 ON (Ignition switch: ST)
P.13A-307). OFF (Ignition switch: ON)
Q: Is the check result normal?
STEP 3. MUT-II/III diagnosis code YES : Go to Step 10 .
Q: Diagnosis code set? NO : Go to Step 9 .
YES : Inspection chart for diagnosis codes (Refer
to P.13A-16)
NO : Go to Step 4 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-256 TROUBLESHOOTING

Q: Is the check result normal?

STEP 9. Connector check: C-129 engine-ECU
YES : Check intermediate connectors C-14*1,
connector
C-136*2, and repair if necessary. If
Connector: C-129 intermediate connectors are normal, check
<L. H. drive vehicles>
and repair harness between C-201 (terminal
No. 5) ignition switch connector and C-129
(terminal No. 71) engine-ECU connector.
• Check output line for open/short
C-129 (Y) circuit.
NO : Repair or replace.

<R. H. drive vehicles>

STEP 10. MUT-II/III data list
• Refer to data list reference table P.13A-361.
a. Item 22: Crank angle sensor
Q: Is the check result normal?
YES : Go to Step 11 .
C-129 (Y) NO : Check crank angle sensor system (Refer to
Code No. P0335 P.13A-149).

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
STEP 11. Check injector for operating sound.
Harness side connector • Check injector for operating sound (Refer to
AK301111AB
P.13A-393).
Connector: C-201 Q: Can operating sound be heard?
<L. H. drive vehicles> YES : Go to Step 12 .
NO : Check the injector system of the defective
cylinder.
(Refer to Code No. P0201: No. 1 injector
system P.13A-108.)
C-201
(Refer to Code No. P0202: No. 2 injector
system P.13A-113.)
(Refer to Code No. P0203: No. 3 injector
system P.13A-118.)
(Refer to Code No. P0204: No. 4 injector
system P.13A-123.)
<R. H. drive vehicles>

C-201

3 2 1
6 5 4
Harness side connector
AK301346 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-257
STEP 12. Check ignition coil spark. STEP 13. Replace engine-ECU.
• After replacing the engine-ECU, re-check the
Connector: C-201
trouble symptoms.
<L. H. drive vehicles>
Q: Does trouble symptom persist?
YES : Check for foreign matters (water, kerosene,
etc.) in fuel and replace if necessary.
NO : Check end.
C-201

<R. H. drive vehicles>

C-201

3 2 1
6 5 4
Harness side connector
AK301346 AB

Connector: B-104, B-113

3 2 1
Harness side
connector

B-104 (GR)
B-113 (GR)
AK301352 AB

Q: Is the check result normal?

YES : Go to Step 13 .
NO : Check ignition circuit system (Refer to
Inspection procedure 28 <L.H.drive
vehicles> P.13A-346 or Inspection
procedure 29<R.H.drive vehicles>
P.13A-353).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-258 TROUBLESHOOTING

Inspection Procedure 6: Starting Impossible (Starter Operative but No Initial Combustion) <A/T>

OPERATION STEP 4. MUT-II/III actuator test

• Refer to Inspection procedure, Ignition circuit • Refer to actuator test reference table P.13A-367.
system <L. H. drive vehicles> P.13A-346 or a. Item 07: Fuel pump
Ignition circuit system <R. H. drive vehicles>
P.13A-353 OK: Operating sound of fuel pump can be
heard.
COMMENT ON TROUBLE SYMPTOM Q: Is the check result normal?
• Failure is possibly caused by failed ignition YES : Go to Step 5 .
circuit, failed fuel feed or other faults. NO : Check fuel pump system (Refer to
Inspection Procedure 24 P.13A-319)
PROBABLE CAUSE
• Failed battery
• Timing belt broken STEP 5. Check timing belt for breakage.
• Failed idle speed control • Engine: Cranking
• Throttle valve fouled around OK: Camshaft rotates.
• Failed ignition system
Q: Is the check result normal?
• Failed fuel system YES : Go to Step 6 .
• Failed immobilizer system NO : Replace timing belt.
• Failed engine-A/T-ECU

DIAGNOSIS PROCEDURE STEP 6. Check the engine start ability.

• With depressing the accelerator pedal slightly,
and start the engine.
STEP 1. Check battery voltage.
Q: Is the start ability good?
• Measure battery voltage at cranking.
YES : Go to Step 7 .
OK: 8 V or higher NO : Go to Step 8 .
Q: Is the check result normal?
YES : Go to STEP 2 . STEP 7. Check idling speed control for operating
NO : Check battery (Refer to GROUP 54A − sound.
Battery − On-vehicle Service − Battery test • Check idle speed control servo for operating
P.54A-5). sound (Refer to P.13A-394).
Q: Is the check result normal?
STEP 2. Check engine warning lamp for burnt out YES : Clean throttle body (throttle valve portion)
bulb. (Refer to P.13A-383).
Q: Is the check result normal? NO : Check idle speed control servo system
YES : Go to Step 3 . (Refer to code No. P0505 P.13A-192).
NO : Check engine-A/T-ECU power supply,
engine control relay and ignition switch IG-1 STEP 8. MUT-II/III data list
system (Refer to Inspection Procedure 23 • Refer to data list reference table P.13A-361.
P.13A-307). a. Item 18: Cranking signal
OK:
STEP 3. MUT-II/III diagnosis code ON (Ignition switch: ST)
Q: Diagnosis code set? OFF (Ignition switch: ON)
YES : Inspection chart for diagnosis codes (Refer Q: Is the check result normal?
to P.13A-16) YES : Go to Step 10 .
NO : Go to Step 4 . NO : Go to Step 9 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
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STEP 9. Connector check: C-124 engine-A/T-ECU STEP 10. MUT-II/III data list
connector • Refer to data list reference table P.13A-361.
a. Item 22: Crank angle sensor
Connector: C-124
<L. H. drive vehicles> Q: Is the check result normal?
YES : Go to Step 11 .
NO : Check crank angle sensor system (Refer to
Code No. P0335 P.13A-149).

C-124 (GR)
STEP 11. Check injector for operating sound.
• Check injector for operating sound (Refer to
<R. H. drive vehicles> P.13A-393).
Q: Can operating sound be heard?
YES : Go to Step 12 .
NO : Check the injector system of the defective
cylinder.
(Refer to Code No. P0201: No. 1 injector
C-124 (GR) system P.13A-108.)
46 45 44 43 42 41
(Refer to Code No. P0202: No. 2 injector
57 56 55 54 53 52 51 50 49 48 47 system P.13A-113.)
66 65 64 63 62 61 60 59 58
(Refer to Code No. P0203: No. 3 injector
Harness side connector system P.13A-118.)
AK301112 AB
(Refer to Code No. P0204: No. 4 injector
Connector: B-20 system P.13A-123.)
6 5 4 3 2 1
10 9 8 7
Harness side
connector

B-20 (B)

AK301350AB

Q: Is the check result normal?

YES : Check intermediate connector is normal,
check and repair harness between B-20
(terminal No. 9) inhibitor switch connector
and C-124 (terminal No. 58)
engine-A/T-ECU connector.
• Check output line for open/short
circuit.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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STEP 12. Check ignition coil spark. STEP 13. Replace engine-A/T-ECU.
• After replacing the engine-A/T-ECU, re-check the
Connector: C-201
trouble symptoms.
<L. H. drive vehicles>
Q: Does trouble symptom persist?
YES : Check for foreign matters (water, kerosene,
etc.) in fuel and replace if necessary.
NO : Check end.
C-201

<R. H. drive vehicles>

C-201

3 2 1
6 5 4
Harness side connector
AK301346 AB

Connector: B-104, B-113

3 2 1
Harness side
connector

B-104 (GR)
B-113 (GR)
AK301352 AB

Q: Is the check result normal?

YES : Go to Step 13 .
NO : Check ignition circuit system (Refer to
Inspection procedure 28 <L.H.drive
vehicles> P.13A-346 or Inspection
procedure 29<R.H.drive vehicles>
P.13A-353).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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Inspection Procedure 7: Starting Impossible (Initial Combustion But No Complete Combustion),

Improper Starting (Long Time to Start)

COMMENT ON TROUBLE SYMPTOM STEP 4. MUT-II/III data list

• Failure is possibly caused by poor ignition, • Refer to data list reference table P.13A-361.
incorrect air-fuel ratio at cranking, improper fuel a. Item 13: Intake air temperature sensor
pressure or other faults. b. Item 21: Engine coolant temperature sensor
PROBABLE CAUSE c. Item 32: Manifold absolute pressure sensor
• Failed battery Q: Are the check results normal?
• Failed ignition system YES : Go to Step 5 .
• Failed fuel system NO : Perform the diagnosis code classified check
• Failed Air-fuel ratio control procedure for the sensor that has shown an
• Failed idle speed control system abnormal data value (Refer to Inspection
• Failed intake system Chart for Diagnosis Codes P.13A-16).
• Failed exhaust gas cleaning system
• Throttle valve fouled around STEP 5. Check start ability.
• Timing belt not in place • With depressing the accelerator pedal slightly,
• Compression pressure improper and start the engine.
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T> Q: Is the start ability good?
YES : Go to Step 6 .
NO : Go to Step 7 .
DIAGNOSIS PROCEDURE

STEP 6. Check idle speed control servo for

STEP 1. Check battery condition.
operating sound.
Q: Have the battery terminal been disconnected? • Check idle speed control servo for operating
YES : After warm-up engine, idle for about 10 sound (Refer to P.13A-394).
minutes.
Q: Is the check result normal?
NO : Go to Step 2 .
YES : Clean throttle body (throttle valve portion)
(Refer to P.13A-383).
STEP 2. Check battery voltage. NO : Check idle speed control servo system
• Measure battery voltage at cranking. (Refer to Code No. P0505 P.13A-192).
OK: 8 V or higher
Q: Is the check result normal? STEP 7. MUT-II/III actuator test
YES : Go to Step 3 . • Refer to actuator test reference table P.13A-367.
NO : Check battery (Refer to GROUP 54A − a. Item 07: Fuel pump
Battery − On-vehicle Service − Battery Test OK: Operating sound of fuel pump can be
P.54A-5). heard.
Q: Is the check result normal?
STEP 3. MUT-II/III diagnosis code YES : Go to Step 8 .
Q: Diagnosis code set? NO : Check fuel pump system (Refer to
YES : Inspection chart for diagnosis codes (Refer Inspection Procedure 24 P.13A-319).
to P.13A-16)
NO : Go to Step 4 . STEP 8. Check air intake from intake hose and
inlet manifold.
Q: Is the check result normal?
YES : Go to Step 9 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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STEP 9. Check injector for operating sound. STEP 11. Perform voltage measurement at C-123
• Check injector for operating sound at engine engine-ECU <M/T> or C-124 engine-A/T-ECU
cranking (Refer to P.13A-393). <A/T> connector.
Q: Can operating sound be heard? Connector: C-123
YES : Go to Step 10 . <L. H. drive vehicles>
NO : Check the injector system of the defective
cylinder.
(Refer to Code No. P0201: No.1 injector system
P.13A-108.)
(Refer to Code No. P0202: No.2 injector system C-123 (Y)
P.13A-113.)
(Refer to Code No. P0203: No.3 injector system <R. H. drive vehicles>
P.13A-118.)
(Refer to Code No. P0204: No.4 injector system
P.13A-123.)

STEP 10. Check timing marks of timing belt.

C-123 (Y)
Q: Is the check result normal?
YES : Go to Step 11 .
NO : Align timing marks. 13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU

<A/T> terminal voltage.
• Ignition switch: ON
• Voltage between terminal No. 13 <M/T> or
terminal No. 48 <A/T> and earth, also between
terminal No. 26 <M/T> or terminal No. 43 <A/T>
and earth.
OK: 0.5 V or less
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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Q: Is the check result normal? Q: Is the check result normal?
YES : Go to Step 13 . YES : Check and repair harness between C-123
NO : Go to Step 12 . (terminal No. 13 and No. 26) engine-ECU
<M/T> or C-124 (terminal No. 43 and No.
STEP 12. Connector check: C-123 engine-ECU 48) engine-A/T-ECU <A/T> connector and
<M/T> or C-124 engine-A/T-ECU <A/T> connector body earth.
• Check earthing line for open circuit
Connector: C-123 and damage.
<L. H. drive vehicles> NO : Repair or replace.

STEP 13. Connector check: B-104 and B-113

ignition coil connectors
C-123 (Y)
Connector: B-104, B-113
3 2 1
Harness side
<R. H. drive vehicles> connector

B-104 (GR)
B-113 (GR)
C-123 (Y)
AK301352 AB

13 12 11 10 9 8 7 6 5 4 3 2 1 Q: Is the check result normal?

26 25 24 23 22 21 20 19 18 17 16 15 14 YES : Go to Step 14 .
Harness side connector NO : Repair or replace.
AK301122 AB

Connector: C-124 STEP 14. Check ignition coil spark.

<L. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 19 .
NO : Go to Step 15 .

C-124 (GR) STEP 15. Check spark plug.

Q: Is the check result normal?
<R. H. drive vehicles> YES : Go to Step 16 .
NO : Replace spark plug.

STEP 16. Check resistive cord itself.

• Check resistive cord itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-32).
C-124 (GR)
Q: Is the check result normal?
46 45 44 43 42 41 YES : Go to Step 17 .
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58
NO : Replace resistive cord.
Harness side connector
AK301112 AB
STEP 17. Check ignition coil itself.
• Check ignition coil itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-32).
Q: Is the check result normal?
YES : Go to Step 18 .
NO : Replace ignition coil.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-264 TROUBLESHOOTING

STEP 18. Check harness between terminal No. 2 Connector: C-122

of each cylinder’s ignition coil connector and <L. H. drive vehicles>
vehicle body earth.
Connector: B-104, B-113
3 2 1
Harness side
connector C-122 (GR)

<R. H. drive vehicles>

B-104 (GR)
B-113 (GR)
AK301352 AB

Connector: C-123
C-122 (GR)
<L. H. drive vehicles>
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
C-123 (Y) • Check earthing line for open circuit and damage.
Q: Is the check result normal?
<R. H. drive vehicles> YES : Check and repair harness between terminal
No. 3 of each cylinder’s ignition coil
connector and C-123 engine-ECU <M/T>
connector or C-122 engine-A/T-ECU <A/T>
connector.
• Check signal line for open/short
C-123 (Y) circuit and damage.
NO : Repair.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
STEP 19. Check spray condition of injector.
Harness side connector
AK301122 AB • Check each injector for spray condition (Refer to
P.13A-393).
Q: Is the check result normal?
YES : Go to Step 20 .
NO : Replace injector.

STEP 20. Check compression pressure.

• Check compression pressure (Refer to GROUP
11A − On-vehicle Service P.11A-13).
Q: Is the check result normal?
YES : Go to Step 21 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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STEP 21. Check EGR control solenoid valve STEP 22. Check EGR valve itself.
itself. • Check EGR valve itself [Refer to GROUP 17 −
• Check EGR control solenoid valve itself [Refer to Emission Control System − Exhaust Gas
GROUP 17 − Emission Control System − Recirculation (EGR) System P.17-16].
Exhaust Gas Recirculation (EGR) System Q: Is the check result normal?
P.17-17]. YES : Go to Step 23 .
Q: Is the check result normal? NO : Replace EGR valve.
YES : Go to Step 22 .
NO : Replace EGR control solenoid valve.
STEP 23. Replace engine-ECU.
• After replacing the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, re-check the trouble
symptoms.
Q: Does trouble symptom persist?
YES : Check for foreign matters (water, kerosene,
etc.) in fuel and replace if necessary.
NO : Check end.

Inspection Procedure 8: Unstable Idling (Rough idling, hunting), Improper Idling Speed (Too high or
too low), Engine Stalls During Idling (Die out)

COMMENT ON TROUBLE SYMPTOM STEP 2. MUT-II/III diagnosis code

• Probable causes can be widely found in ignition
system, air-fuel ratio control system, idle speed Q: Diagnosis code set?
control system, fuel system, etc. A sudden YES : Inspection chart for diagnosis code (Refer
engine stall is possibly caused by poor connector to P.13A-16).
contact. NO : Go to Step 3 .

PROBABLE CAUSE STEP 3. MUT-II/III data list

• Failed ignition system • Refer to data list reference table P.13A-361.
• Failed fuel system a. Item 13: Intake air temperature sensor
• Failed air-fuel ratio control system b. Item 14: Throttle position sensor
• Failed idle speed control system c. Item 21: Engine coolant temperature sensor
• Failed intake/exhaust system d. Item 32: Manifold absolute pressure sensor
• Failed emission gas cleaning system
• Throttle valve body fouled Q: Are the check results normal?
• Timing belt out of place YES : Go to Step 4 .
• Compression pressure improper NO : Perform the diagnosis code classified check
• Failed engine-ECU <M/T> procedure for the sensor that has shown an
• Failed engine-A/T-ECU <A/T> abnormal data value (Refer to Inspection
Chart for Diagnosis Codes P.13A-16).
DIAGNOSIS PROCEDURE
STEP 4. MUT-II/III data list
• Refer to data list reference table P.13A-361.
STEP 1. Check battery condition.
a. Item 27: Power steering fluid pressure switch
Q: Has the battery terminal been disconnected?
Q: Is the check result normal?
YES : After warm-up engine, idle for about 10
YES : Go to Step 5 .
minutes. NO : Check power steering fluid pressure switch
NO : Go to Step 2 .
system (Refer to Code No. P0551
P.13A-202).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-266 TROUBLESHOOTING

STEP 5. Check idle speed control servo for STEP 11. Perform voltage measurement at C-123
operating sound. engine-ECU <M/T> connector or C-124
• Check idle speed control servo for operating engine-A/T-ECU <A/T> connector.
sound (Refer to P.13A-394). Connector: C-123
Q: Is the check result normal? <L. H. drive vehicles>
YES : Go to Step 6 .
NO : Check idle speed control servo system
(Refer to Code No. P0505 P.13A-192).

C-123 (Y)
STEP 6. Check throttle body (throttle valve
portion) for contamination.
<R. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 7 .
NO : Clean throttle body (throttle valve portion)
(Refer to P.13A-383).

STEP 7. Check air intake from intake hose and C-123 (Y)
inlet manifold.
Q: Is the check result normal? 13 12 11 10 9 8 7 6 5 4 3 2 1
YES : Go to Step 8 . 26 25 24 23 22 21 20 19 18 17 16 15 14
NO : Repair. Harness side connector
AK301122 AB

STEP 8. Check injector for operating sound. Connector: C-124

• Check injector for operating sound (Refer to <L. H. drive vehicles>
P.13A-393).
Q: Can operating sound be heard?
YES : Go to Step 9 .
NO : Check the injector system of the defective
C-124 (GR)
cylinder.
(Refer to Code No. P0201: No. 1 injector
system P.13A-108.) <R. H. drive vehicles>
(Refer to Code No. P0202: No. 2 injector
system P.13A-113.)
(Refer to Code No. P0203: No. 3 injector
system P.13A-118.)
(Refer to Code No. P0204: No. 4 injector
system P.13A-123.) C-124 (GR)

46 45 44 43 42 41
STEP 9. Check timing marks of timing belt. 57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58
Q: Is the check result normal? Harness side connector
YES : Go to Step 10 . AK301112 AB
NO : Align timing marks. • Measure engine-ECU <M/T> or engine-A/T-ECU
<A/T> terminal voltage.
STEP 10. MUT-II/III data list • Ignition switch: ON
• Refer to data list reference table P.13A-361. • Voltage between terminal No. 13 <M/T> or
a. Item 11: Oxygen sensor (front) terminal No. 48 <A/T> and earth, also between
terminal No. 26 <M/T> or terminal No. 42 <A/T>
Q: Is the check result normal?
and earth.
YES : Go to Step 11 .
NO : Check oxygen sensor (front) system (Refer OK: 0.5 V or less
to Code No. P0130 P.13A-70).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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13A-267
Q: Is the check result normal? Q: Is the check result normal?
YES : Go to Step 13 . YES : Check and repair harness between C-123
NO : Go to Step 12 . (terminal No. 13 and No. 26) engine-ECU
<M/T> connector or C-124 (terminal No. 42
STEP 12. Connector check: C-123 engine-ECU and No. 48) engine-A/T-ECU <A/T>
<M/T> connector or C-124 engine-A/T-ECU <A/T> connector and body earth.
connector • Check earthing line for open circuit
and damage.
Connector: C-123 NO : Repair or replace.
<L. H. drive vehicles>

STEP 13. Perform voltage measurement at C-125

engine-ECU <M/T> connector or C-122
engine-A/T-ECU <A/T> connector.
C-123 (Y) Connector: C-125
<L. H. drive vehicles>
<R. H. drive vehicles>

C-125 (Y)

C-123 (Y) <R. H. drive vehicles>

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

C-125 (Y)
Connector: C-124
<L. H. drive vehicles>
38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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Connector: C-122 STEP 14. Connector check: C-125 engine-ECU

<L. H. drive vehicles> <M/T> connector or C-122 engine-A/T-ECU <A/T>
connector and B-26 alternator connector
Connector: C-125
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-125 (Y)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
C-125 (Y)
Harness side connector
AK301123 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU 38 37 36 35 34 33 32 31

46 45 44 43 42 41 40 39
<A/T> terminal voltage.
Harness side connector
• Engine: Idling after warm-up AK301135 AB
• Transmission: Neutral <M/T> or P range <A/T>
• Radiator fan: Not operating Connector: C-122
• Voltage between terminal No. 33 <M/T> or <L. H. drive vehicles>
terminal No. 8 <A/T> and earth.
OK: Switching the headlamps to ON from
OFF causes the voltage to increase by 0.2 −
3.5 V.
C-122 (GR)
Q: Is the check result normal?
YES : Go to Step 16 .
NO : Go to Step 14 . <R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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13A-269

Connector: B-26 STEP 15. Check harness between C-125 (terminal

No. 33) engine-ECU <M/T> connector or C-122
B-26 (GR) (terminal No. 8) engine-A/T-ECU <A/T> connector
and B-26 (terminal No. 1) alternator connector.
Connector: C-125
M
<L. H. drive vehicles>
4 3 2 1
Harness side
connector

AK301155AB
C-125 (Y)
Q: Is the check result normal?
YES : Go to Step 15 .
NO : Repair or replace. <R. H. drive vehicles>

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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Connector: B-26 Connector: C-122

<L. H. drive vehicles>
B-26 (GR)

M
4 3 2 1 C-122 (GR)
Harness side
connector
<R. H. drive vehicles>
AK301155AB

NOTE: Before checking harness, check intermediate

connector B-18, and repair if necessary.
• Check output line for open/short circuit and
damage.
C-122 (GR)
Q: Is the check result normal?
YES : Go to Step 16 . 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
NO : Repair. 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
STEP 16. Perform voltage measurement at C-125
engine-ECU <M/T> connector or C-122 • Measure engine-ECU <M/T> or engine-A/T-ECU
engine-A/T-ECU <A/T> connector. <A/T> terminal voltage.
• Engine: Idling after warm-up
Connector: C-125
• Transmission : Neutral <M/T> or P range <A/T>
<L. H. drive vehicles>
• Radiator fan: Not operating
• Voltage between terminal No. 33 <M/T> or
terminal No. 8 <A/T> and earth.
OK: Switching the headlamps to ON from
C-125 (Y) OFF causes the voltage to fall.
Q: Is the check result normal?
<R. H. drive vehicles> YES : Go to Step 20 .
NO : Go to Step 17 .

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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STEP 17. Connector check: C-125 engine-ECU Connector: B-26
<M/T> connector or C-122 engine-A/T-ECU <A/T>
connector and B-26 alternator connector B-26 (GR)

Connector: C-125
<L. H. drive vehicles>
M
4 3 2 1
Harness side
connector

C-125 (Y) AK301155AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Go to Step 18 .
NO : Repair or replace.

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-272 TROUBLESHOOTING

STEP 18. Check harness between C-125 (terminal Connector: B-26

No. 41) engine-ECU <M/T> connector or C-124
(terminal No. 54) engine-A/T-ECU <A/T> B-26 (GR)
connector and B-26 (terminal No. 4) alternator
connector.
M
Connector: C-125
4 3 2 1
<L. H. drive vehicles>
Harness side
connector

AK301155AB

NOTE: Before checking harness, check intermediate

C-125 (Y)
connector B-18, and repair if necessary.
• Check output line for open/short circuit and
<R. H. drive vehicles> damage.
Q: Is the check result normal?
YES : Go to Step 19 .
NO : Repair.

C-125 (Y) STEP 19. Check the trouble symptoms.

Q: Does trouble symptom persist?
38 37 36 35 34 33 32 31 YES : Replace alternator.
46 45 44 43 42 41 40 39 NO : Intermittent malfunction (Refer to GROUP
Harness side connector 00 − How to Use Troubleshooting/Inspection
AK301135 AB
Service Points P.00-6).
Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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STEP 20. Perform voltage measurement at C-123 OK:
engine-ECU <M/T> connector or C-124 1 V or less (when the A/C is under low load)
engine-A/T-ECU <A/T> connector. System voltage (when the A/C is under high
load)
Connector: C-123
<L. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 21 .
NO : Check A/C load signal system (Refer to
Inspection Procedure 27 P.13A-341).

C-123 (Y) STEP 21. Connector check: B-104 and B-113

ignition coil connectors
<R. H. drive vehicles> Connector: B-104, B-113
3 2 1
Harness side
connector

C-123 (Y)
B-104 (GR)
B-113 (GR)
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14 AK301352 AB

Harness side connector

AK301122 AB Q: Is the check result normal?
YES : Go to Step 22 .
Connector: C-122 NO : Repair or replace.
<L. H. drive vehicles>

STEP 22. Check ignition coil spark.

Q: Is the check result normal?
YES : Go to Step 27 .
C-122 (GR) NO : Go to Step 23 .

<R. H. drive vehicles> STEP 23. Check spark plug.

Q: Is the check result normal?
YES : Go to Step 24 .
NO : Replace spark plug.

STEP 24. Check resistive cord

C-122 (GR)
• Check resistive cord itself (Refer to GROUP 16 −
77 76 75 74 73 72 71 Ignition System − On-vehicle Service P.16-32).
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 Q: Q: Is the check result normal?
Harness side connector YES : Go to Step 25 .
AK301123 AB
NO : Replace resistive cord.
• Measure engine-ECU <M/T> or engine-A/T-ECU
<A/T> terminal voltage. STEP 25. Check ignition coil itself.
• Engine: Idling • Check ignition coil itself (Refer to GROUP 16 −
• A/C switch: ON (A/C compressor ON) Ignition System − On-vehicle Service P.16-32).
• Voltage between terminal No. 24 <M/T> or
terminal No. 61 <A/T> and earth. Q: Is the check result normal?
YES : Go to Step 26 .
NO : Replace ignition coil.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-274 TROUBLESHOOTING

STEP 26. Check harness between terminal No. 2 Connector: C-122

of ignition coil connector of each cylinder and <L. H. drive vehicles>
body earth.
Connector: B-104, B-113
3 2 1
Harness side
connector C-122 (GR)

<R. H. drive vehicles>

B-104 (GR)
B-113 (GR)
AK301352 AB

Connector: C-123
C-122 (GR)
<L. H. drive vehicles>
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
C-123 (Y) • Check earthing line for open/short circuit and
damage.
<R. H. drive vehicles> Q: Is the check result normal?
YES : Check and repair harness between terminal
No. 3 of ignition coil connector of each
cylinder and C-123 engine-ECU <M/T> or
C-122 engine-A/T-ECU <A/T>.
• Check signal line for open/short and
C-123 (Y) damage.
NO : Repair.
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
STEP 27. Check injector for spray condition.
Harness side connector
AK301122 AB • Check each injector for spray condition (Refer to
P.13A-393).
Q: Is the check result normal?
YES : Go to Step 28 .
NO : Replace injector.

STEP 28. Check compression pressure.

• Check compression pressure (Refer to GROUP
11A − On-vehicle Service P.11A-13).
Q: Is the check result normal?
YES : Go to Step 29 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
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STEP 29. Check purge control solenoid valve STEP 31. Check EGR valve itself.
itself. • Check EGR valve itself [Refer to GROUP 17 −
• Check purge control solenoid valve itself (Refer Emission Control System − Exhaust Gas
to GROUP 17 − Emission Control System − Recirculation (EGR) System P.17-16].
Evaporative Emission Control System P.17-12) Q: Is the check result normal?
Q: Is the check result normal? YES : Go to Step 32 .
YES : Go to Step 30 . NO : Replace EGR valve.
NO : Replace purge control solenoid valve.
STEP 32. MUT-II/III actuator test
STEP 30. Check EGR control solenoid valve • Refer to actuator test reference table P.13A-367.
itself. a. Item 07: Fuel pump
• Check EGR control solenoid valve itself [Refer to OK: Operating sounds of fuel pump can be
GROUP 17 − Emission Control System − heard.
Exhaust Gas Recirculation (EGR) System
P.17-17]. Q: Is the check result normal?
YES : Go to Step 33 .
Q: Is the check result normal? NO : Check fuel pump system (Refer to
YES : Go to Step 31 . inspection Procedure 24 P.13A-319).
NO : Replace EGR control solenoid valve.

STEP 33. Replace engine-ECU <M/T> or

engine-A/T-ECU <A/T>.
• After engine-ECU <M/T> or engine-A/T-ECU
<A/T> is replaced, re-check for trouble symptom.
Q: Do trouble system persist?
YES : Check for foreign matters (water, kerosene,
etc.) in fuel and replace if necessary.
NO : Check end.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-276 TROUBLESHOOTING

Inspection Procedure 9: The Engine Stalls when Starting the Car (Pass out)

COMMENT ON TROUBLE SYMPTOM STEP 5. Connector check: B-104 and B-113

• Engine stall on starting is possibly caused by ignition connectors.
misfire due to failed spark plug, improper air-fuel
ratio at accelerator pedal depression or other Connector: B-104, B-113
3 2 1
faults.
Harness side
connector
PROBABLE CAUSE
• Failed ignition system
• Failed intake system
• Failed emission gas cleaning system
• Failed engine-ECU <M/T> B-104 (GR)
• Failed engine-A/T-ECU <A/T> B-113 (GR)
AK301352 AB
DIAGNOSIS PROCEDURE
Q: Is the check result normal?
YES : Go to Step 6 .
STEP 1. MUT-II/III diagnosis code NO : Repair or replace.
Q: Diagnosis code set?
YES : Inspection chart for diagnosis code (Refer STEP 6. Check ignition coil spark.
to P.13A-16).
NO : Go to Step 2 . Q: Is the check result normal?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
STEP 2. Check EGR control solenoid valve itself. NO : Go to Step 7 .
• Check EGR control solenoid valve itself [Refer to
GROUP 17 − Emission Control System −
STEP 7. Check spark plug.
Exhaust Gas Recirculation (EGR) System
P.17-17]. Q: Is the check result normal?
YES : Go to Step 8 .
Q: Is the check result normal? NO : Replace spark plug.
YES : Go to Step 3 .
NO : Replace EGR control solenoid valve.
STEP 8. Check resistive cord itself.
• Check resistive cord itself (Refer to GROUP 16 −
STEP 3. Check EGR valve itself.
Ignition System − On-vehicle Service P.16-32).
• Check EGR valve itself [Refer to GROUP 17 −
Emission Control System − Exhaust Gas Q: Is the check result normal?
Recirculation (EGR) System P.17-16]. YES : Go to Step 9 .
NO : Replace resistive cord.
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Replace EGR valve. STEP 9. Check ignition coil itself.
• Check ignition coil itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-32).
STEP 4. Check air intake from intake hose and
inlet manifold. Q: Is the check result normal?
YES : Go to Step 10 .
Q: Is the check result normal? NO : Replace ignition coil.
YES : Go to Step 5 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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STEP 10. Check harness between terminal No. 2 Connector: C-122
of ignition coil connector of each cylinder and <L. H. drive vehicles>
body earth.
Connector: B-104, B-113
3 2 1
Harness side
connector C-122 (GR)

<R. H. drive vehicles>

B-104 (GR)
B-113 (GR)
AK301352 AB

Connector: C-123
C-122 (GR)
<L. H. drive vehicles>
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
C-123 (Y) • Check earthing line for open circuit and damage.
Q: Is the check result normal?
<R. H. drive vehicles> YES : Check and repair harness between terminal
No. 3 of ignition coil connector of each
cylinder and C-123 engine-ECU <M/T> or
C-122 engine-A/T-ECU <A/T>.
• Check signal line for open/short
circuit and damage.
C-123 (Y) NO : Repair.

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Inspection Procedure 10: The Engine Stalls when Decelerating

COMMENT ON TROUBLE SYMPTOM • Failed engine-ECU <M/T>

• Engine stall on deceleration is possibly caused • Failed engine-A/T-ECU <A/T>
by insufficient air intake, improper air-fuel ratio
due to failed exhaust gas recirculation system or DIAGNOSIS PROCEDURE
other faults.

PROBABLE CAUSE STEP 1. MUT-II/III diagnosis code

• Failed idle speed control system Q: Diagnosis code set?
• Failed ignition system YES : Inspection chart for diagnosis code (Refer
• Failed emission control system to P.13A-16).
• Throttle valve fouled NO : Go to Step 2 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-278 TROUBLESHOOTING

STEP 2. MUT-II/III data list STEP 7. Connector check: B-104 and B-113
• Refer to data list reference table P.13A-361. ignition coil connectors
a. Item 14: Throttle position sensor
Connector: B-104, B-113
Q: Is the check result normal? 3 2 1
YES : Go to Step 3 . Harness side
connector
NO : Check throttle position sensor system
(Refer to Code No. P0120 P.13A-52).

STEP 3. MUT-II/III data list B-104 (GR)

• Refer to data list reference table P.13A-361.
B-113 (GR)
a. Item 45: Idle speed control servo position
AK301352 AB
OK: Idle speed control servo drops to 0 − 2
steps at deceleration (engine at 1,000 r/min Q: Is the check result normal?
or higher). YES : Go to Step 8 .
Q: Is the check result normal? NO : Repair or replace.
YES : Go to Step 4 .
NO : Check idle speed control servo system STEP 8. Check ignition coil spark.
(Refer to Code No. P0505 P.13A-192).
Q: Is the check result normal?
YES : Replace engine-ECU <M/T> or
STEP 4. Check EGR control solenoid valve itself. engine-A/T-ECU <A/T>.
• Check EGR control solenoid valve itself [Refer to NO : Go to Step 9 .
GROUP 17 − Emission Control System −
Exhaust Gas Recirculation (EGR) System
STEP 9. Check spark plug.
P.17-17].
Q: Is the check result normal?
Q: Is the check result normal?
YES : Go to Step 10 .
YES : Go to Step 5 .
NO : Replace spark plug.
NO : Replace EGR control solenoid valve.

STEP 10. Check resistive cord itself.

STEP 5. Check EGR valve itself.
• Check resistive cord itself (Refer to GROUP 16 −
• Check EGR valve itself [Refer to GROUP 17 −
Ignition System − On-vehicle Service P.16-32).
Emission Control System − Exhaust Gas
Recirculation (EGR) System P.17-16]. Q: Is the check result normal?
YES : Go to Step 11 .
Q: Is the check result normal? NO : Replace resistive cord.
YES : Go to Step 6 .
NO : Replace EGR valve.
STEP 11. Check ignition coil itself.
• Check ignition coil itself (Refer to GROUP 16 −
STEP 6. Check throttle body (throttle valve
Ignition System − On-vehicle Service P.16-32).
portion) for contamination.
Q: Is the check result normal?
Q: Is the check result normal?
YES : Go to Step 12 .
YES : Go to Step 7 .
NO : Replace ignition coil.
NO : Clean throttle body (throttle valve portion)
(Refer to P.13A-383).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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13A-279
STEP 12. Check harness between terminal No. 2 Connector: C-122
of ignition coil connector of each cylinder and <L. H. drive vehicles>
body earth.
Connector: B-104, B-113
3 2 1
Harness side
connector C-122 (GR)

<R. H. drive vehicles>

B-104 (GR)
B-113 (GR)
AK301352 AB

Connector: C-123
C-122 (GR)
<L. H. drive vehicles>
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
C-123 (Y) • Check earthing line for open circuit and damage.
Q: Is the check result normal?
<R. H. drive vehicles> YES : Check and repair harness between terminal
No. 3 of ignition coil connector of each
cylinder and C-123 engine-ECU <M/T> or
C-122 engine-A/T-ECU <A/T>.
• Check signal line for open/short
circuit and damage.
C-123 (Y) NO : Repair.

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-280 TROUBLESHOOTING

Inspection Procedure 11: Engine Does Not Revole Up

COMMENT ON TROUBLE SYMPTOM YES : Go to Step 4 .

• Failure is possibly caused by failed fuel system, NO : Repair or replace
ignition system or other faults.
STEP 4. Check ignition coil spark.
PROBABLE CAUSE
• Failed ignition system Q: Is the check result normal?
• Failed fuel system YES : Go to Step 9 .
• Timing belt out of place NO : Go to Step 5 .
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T> STEP 5. Check spark plug.

DIAGNOSIS PROCEDURE Q: Is the check result normal?

YES : Go to Step 6 .
NO : Replace spark plug.
STEP 1. MUT-II/III diagnosis code
Q: Diagnosis code set? STEP 6. Check resistive cord itself.
YES : Inspection chart for diagnosis code (Refer • Check resistive cord itself (Refer to GROUP 16 −
to P.13A-16). Ignition System − On-vehicle Service P.16-32).
NO : Go to Step 2 .
Q: Is the check result normal?
YES : Go to Step 7 .
STEP 2. Check timing marks of timing belt. NO : Replace resistive cord.
Q: Is the check result normal?
YES : Go to Step 3 . STEP 7. Check ignition coil itself.
NO : Align match marks. • Check ignition coil itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-32).
STEP 3. Connector check: B-104 and B-113 Q: Is the check result normal?
ignition coil connectors YES : Go to Step 8 .
NO : Replace ignition coil.
Connector: B-104, B-113
3 2 1
Harness side
connector

B-104 (GR)
B-113 (GR)
AK301352 AB

Q: Is the check result normal?

 MULTIPORT FUEL INJECTION (MFI) <4G1>
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13A-281
STEP 8. Check harness between terminal No. 2 of Connector: C-122
ignition coil connector of each cylinder and body <L. H. drive vehicles>
earth.
Connector: B-104, B-113
3 2 1
Harness side
connector C-122 (GR)

<R. H. drive vehicles>

B-104 (GR)
B-113 (GR)
AK301352 AB

Connector: C-123
C-122 (GR)
<L. H. drive vehicles>
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
C-123 (Y) • Check earthing line for open circuit and damage.
Q: Is the check result normal?
<R. H. drive vehicles> YES : Check and repair harness between terminal
No. 3 of ignition coil connector of each
cylinder and C-123 engine-ECU <M/T> or
C-122 engine-A/T-ECU <A/T>.
• Check signal line for open/short
circuit and damage.
C-123 (Y) NO : Repair.

13 12 11 10 9 8 7 6 5 4 3 2 1 STEP 9. Fuel pressure measurement.

26 25 24 23 22 21 20 19 18 17 16 15 14
• Fuel pressure measurement (Refer to
Harness side connector
AK301122 AB P.13A-384).
Q: Is the check result normal?
YES : Replace engine-ECU<M/T> or
engine-A/T-ECU<A/T>.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-282 TROUBLESHOOTING

Inspection Procedure 12: Hesitation, Sag, Poor Acceleration, Stumble, Surge

COMMENT ON TROUBLE SYMPTOM YES : Go to Step 4 .

• Failure is possibly caused by failed ignition NO : Perform the diagnosis code classified check
system, improper air-fuel ratio, improper procedure for the sensor that has shown an
compression pressure or other faults. abnormal data value (Refer to Inspection
Chart for diagnosis codes P.13A-16).
PROBABLE CAUSE
• Failed air-fuel ratio control system
STEP 4. Check purge control solenoid valve
• Failed ignition system
itself.
• Failed fuel system
• Check purge control solenoid valve itself (Refer
• Failed intake and exhaust system
to GROUP 17 − Emission Control System −
• Failed emission control system
Evaporative Emission Control System P.17-12).
• Throttle valve fouled
• Improper compression pressure Q: Is the check result normal?
• Failed engine-ECU <M/T> YES : Go to Step 5 .
• Failed engine-A/T-ECU <A/T> NO : Replace purge control solenoid valve.

DIAGNOSIS PROCEDURE STEP 5. Check EGR control solenoid valve itself.

• Check EGR control solenoid valve itself [Refer to
STEP 1. MUT-II/III diagnosis code GROUP 17 − Emission Control System −
Exhaust Gas Recirculation (EGR) System
Q: Diagnosis code set? P.17-17].
YES : Inspection chart for diagnosis code (Refer
to P.13A-16). Q: Is the check result normal?
NO : Go to Step 2 . YES : Go to Step 6 .
NO : Replace EGR control solenoid valve.

STEP 2. Check injector for operating sound.

• Check injector for operating sound (Refer to STEP 6. Check EGR valve itself.
P.13A-393). • Check EGR itself [Refer to GROUP 17 −
Emission Control System − Exhaust Gas
Q: Can operating sound be heard? Recirculation (EGR) System P.17-16].
YES : Go to Step 3 .
NO : Check the injector system of the defective Q: Is the check result normal?
cylinder. YES : Go to Step 7 .
(Refer to code No. P0201: No. 1 injector system NO : Replace EGR valve.
P.13A-108).
(Refer to code No. P0202: No. 2 injector system STEP 7. MUT-II/III data list
P.13A-113). • Refer to data list reference table P.13A-361.
(Refer to code No. P0203: No. 3 injector system a. Item 11: Oxygen sensor (front)
P.13A-118).
Q: Is the check result normal?
(Refer to code No. P0204: No. 4 injector system YES : Go to Step 8 .
P.13A-123). NO : Check oxygen sensor system (Refer to
Code No. P0130 P.13A-70).
STEP 3. MUT-II/III data list
• Refer to data list reference table P.13A-361.
a. Item 14: Throttle position sensor
b. Item 21: Engine coolant temperature sensor
c. Item 32: Manifold absolute pressure sensor
Q: Are the check results normal?
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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STEP 8. Connector check: B-104 and B-113 STEP 12. Check ignition coil itself.
ignition coil connectors • Check ignition coil itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-32).
Connector: B-104, B-113
3 2 1 Q: Is the check result normal?
Harness side YES : Go to Step 13 .
connector
NO : Replace ignition coil.

STEP 13. Check harness between terminal No. 2

B-104 (GR)
of ignition coil connector of each cylinder and
body earth.
B-113 (GR)
AK301352 AB Connector: B-104, B-113
3 2 1
Q: Is the check result normal? Harness side
connector
YES : Go to Step 9 .
NO : Repair or replace.

STEP 9. Check ignition coil spark. B-104 (GR)

Q: Is the check result normal? B-113 (GR)
YES : Go to Step 14 . AK301352 AB
NO : Go to Step 10 .
Connector: C-123
<L. H. drive vehicles>
STEP 10. Check spark plug.
Q: Is the check result normal?
YES : Go to Step 11 .
NO : Replace spark plug.
C-123 (Y)
STEP 11. Check resistive cord itself.
• Check resistive cord itself (Refer to GROUP 16 − <R. H. drive vehicles>
Ignition System − On-vehicle Service P.16-32).
Q: Is the check result normal?
YES : Go to Step 12 .
NO : Replace resistive cord.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-284 TROUBLESHOOTING

Connector: C-122 STEP 14. Check throttle body (throttle valve

<L. H. drive vehicles> portion) for contamination.
Q: Is the check result normal?
YES : Go to Step 15 .
NO : Clean throttle body (throttle valve portion)
(Refer to P.13A-383).
C-122 (GR)

STEP 15. Fuel pressure measurement.

<R. H. drive vehicles> • Fuel pressure measurement (Refer to
P.13A-384).
Q: Is the check result normal?
YES : Go to Step 16 .
NO : Repair.

C-122 (GR)
STEP 16. Check compression pressure.
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
• Check compression pressure (Refer to GROUP
100 99 98 97 96 95 94 93 92 91 11A − On-vehicle Service P.11A-13).
Harness side connector
AK301123 AB Q: Is the check result normal?
YES : Replace engine-ECU <M/T> or
• Check earthing line for open circuit and damage.
engine-A/T-ECU <A/T>.
Q: Is the check result normal? NO : Repair.
YES : Check and repair harness between terminal
No. 3 of ignition coil connector of each
cylinder and C-123 engine-ECU <M/T> or
C-122 engine-A/T-ECU <A/T>
• Check signal line for open/short
circuit and damage.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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Inspection Procedure 13: The Feeling of Impact or Vibration when Accelerating

COMMENT ON TROUBLE SYMPTOM STEP 3. Check ignition coil spark.

• Failure is possibly caused by failed ignition leak
with rise in spark plug required voltage at Q: Is the check result normal?
acceleration. YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
PROBABLE CAUSE NO : Go to Step 4 .
• Failed ignition system
• Failed engine-ECU <M/T> STEP 4. Check spark plug.
• Failed engine-A/T-ECU <A/T>
Q: Is the check result normal?
DIAGNOSIS PROCEDURE YES : Go to Step 5 .
NO : Replace spark plug.

STEP 1. MUT-II/III diagnosis code

STEP 5. Check resistive cord itself.
Q: Diagnosis code set? • Check resistive cord itself (Refer to GROUP 16 −
YES : Inspection chart for diagnosis code (Refer Ignition System − On-vehicle Service P.16-32).
to P.13A-16).
Q: Is the check result normal?
NO : Go to Step 2 .
YES : Go to Step 6 .
NO : Replace resistive cord.
STEP 2. Check connector: B-104 and B-113
ignition coil connectors
STEP 6. Check ignition coil itself.
Connector: B-104, B-113 • Check ignition coil itself (Refer to GROUP 16 −
3 2 1 Ignition System − On-vehicle Service P.16-32).
Harness side
connector Q: Is the check result normal?
YES : Go to Step 7 .
NO : Replace ignition coil.

B-104 (GR)
B-113 (GR)
AK301352 AB

Q: Is the check result normal?

YES : Go to Step 3 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-286 TROUBLESHOOTING

STEP 7. Check harness between terminal No. 2 of Connector: C-122

ignition coil connector of each cylinder and body <L. H. drive vehicles>
earth.
Connector: B-104, B-113
3 2 1
Harness side
connector C-122 (GR)

<R. H. drive vehicles>

B-104 (GR)
B-113 (GR)
AK301352 AB

Connector: C-123
C-122 (GR)
<L. H. drive vehicles>
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB
C-123 (Y) • Check earthing line for open circuit and damage.
Q: Is the check result normal?
<R. H. drive vehicles> YES : Check and repair harness between terminal
3 of ignition coil connector of each cylinder
and C-123 engine-ECU <M/T> or C-122
engine-A/T-ECU <A/T>
• Check signal line for open/short
circuit and damage.
C-123 (Y) NO : Repair.

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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13A-287

Inspection Procedure 14: The Feeling of Impact or Vibration when Decelerating

COMMENT ON TROUBLE SYMPTOM YES : Go to Step 3 .

• Failure is possibly caused by insufficient air NO : Check idle speed control servo system
intake due to failed idle speed control system. (Refer to Code No. P0505 P.13A-192).

PROBABLE CAUSE
STEP 3. MUT-II/III data list
• Failed idle speed control system
• Refer to data list reference table P.13A-361.
• Throttle valve body fouled
a. Item 14: Throttle position sensor
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T> Q: Is the check result normal?
YES : Go to Step 4 .
DIAGNOSIS PROCEDURE NO : Check throttle position sensor system
(Refer to Code No. P0120 P.13A-52).

STEP 1. MUT-II/III diagnosis code

STEP 4. Check throttle body (throttle valve)
Q: Diagnosis code set? contamination.
YES : Inspection chart for diagnosis code (Refer
to P.13A-16). Q: Is the check result normal?
NO : Go to Step 2 . YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Clean throttle body (throttle valve portion)
STEP 2. Check idle speed control servo for (Refer to P.13A-383).
operating sound.
• Check idle speed control servo for operating
sound (Refer to P.13A-394).
Q: Is the check result normal?

Inspection Procedure 15: Knocking

COMMENT ON TROUBLE SYMPTOM YES : Inspection chart for diagnosis code (Refer
• Failure is possibly caused by failed detonation to P.13A-16).
control, improper thermal value of spark plug or NO : Go to Step 2 .
other faults.
STEP 2. Connector check: B-104 and B-113
PROBABLE CAUSE
ignition coil connectors
• Defective detonation sensor
• Failed detonation control system Connector: B-104, B-113
• Failed ignition system 3 2 1
• Defective spark plug Harness side
connector
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>

DIAGNOSIS PROCEDURE
B-104 (GR)
B-113 (GR)
STEP 1. MUT-II/III diagnosis code AK301352 AB
Q: Diagnosis code set?
Q: Is the check result normal?
YES : Go to Step 3 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-288 TROUBLESHOOTING

STEP 3. Check ignition coil spark. STEP 7. Check harness between ignition coil
Q: Is the check result normal?
connector terminal No. 2 of each cylinder and
YES : Check detonation sensor (Refer to Code body earth.
No. P0325 P.13A-145). Connector: B-104, B-113
NO : Go to Step 4 . 3 2 1
Harness side
connector
STEP 4. Check spark plug.
Q: Is the check result normal?
YES : Go to Step 5 .
NO : Replace spark plug. B-104 (GR)
B-113 (GR)
STEP 5. Check resistive cord itself. AK301352 AB
• Check resistive cord itself (Refer to GROUP 16
−Ignition System − On-vehicle Service P.16-32). Connector: C-123
<L. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 6 .
NO : Replace resistive cord.

STEP 6. Check ignition coil itself. C-123 (Y)

• Check ignition coil itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-32). <R. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 7 .
NO : Replace ignition coil.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-289

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Check earthing line for open circuit and damage.

Q: Is the check result normal?
YES : Check and repair harness between ignition
coil connector terminal No. 3 of each
cylinder and C-123 engine-ECU <M/T> or
C-122 engine-A/T-ECU <A/T>.
• Check signal line for open circuit,
short circuit and damage.
NO : Repair.

Inspection Procedure 16: Ignition Timing Offset

COMMENT ON TROUBLE SYMPTOM • Failed engine-A/T-ECU <A/T>

• Failure is possibly caused by failed crank angle
sensor, failed camshaft position sensor, improper DIAGNOSIS PROCEDURE
installed timing belt or other faults.

PROBABLE CAUSE STEP 1. MUT-II/III diagnosis code

• Failed crank angle sensor Q: Diagnosis code set?
• Failed camshaft position sensor YES : Inspection chart for diagnosis code (Refer
• Improperly installed timing belt to P.13A-16).
• Failed engine-ECU <M/T> NO : Go to Step 2 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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Q: Is the check result normal?

STEP 2. Perform output wave pattern
YES : Go to Step 3 .
measurement of crank angle sensor and NO : Go to Step 4 .
camshaft position sensor (Using oscilloscope).
Connector: B-116 STEP 3. Check the trouble symptoms.
Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Intermittent malfunction (Refer to GROUP
Crank angle 00 − How to Use Troubleshooting/Inspection
sensor
Service Points P.00-6).

STEP 4. Check crank angle sensor and camshaft

position sensor mounted conditions.
Q: Is the check result normal?
B-116 (B) YES : Go to Step 5 .
NO : Repair.

STEP 5. Check timing marks of timing belt.

2 1
Q: Is the check result normal?
3
YES : Go to Step 6 .
Harness side connector AK301134 AB NO : Align timing marks.

Connector: B-107
STEP 6. Check crank angle sensor vane.
B-107 (GR) Q: Is the check result normal?
YES : Go to Step 7 .
NO : Replace crank angle sensor vane.

STEP 7. Check camshaft position sensing

3 2 1 cylinder.
Harness side connector AK301139 AB Q: Is the check result normal?
YES : Go to Step 8 .
Crank Angle Sensor NO : Replace camshaft position sensing cylinder.
• Use special tool test harness (MD998478) to
connect B-116 crank angle sensor connector, and
STEP 8. Replace crank angle sensor.
measure at pick-up harness.
• After replacing the crank angle sensor, re-check
• Engine: Idling
the trouble symptoms.
• Transmission: Neutral <M/T> or P range <A/T>
• Voltage between terminal No. 2 and earth. Q: Does trouble symptom persist?
YES : Go to Step 9 .
Camshaft Position Sensor NO : Check end.
• Use special tool test harness (MB991709) to
connect B-107 camshaft position sensor
connector, and measure at pick-up harness.
• Engine: Idling
• Transmission: Neutral <M/T> or P range <A/T>
• Voltage between terminal No. 2 and earth.
OK: Output waveform timings of both
sensors are the same as the check
procedure (Refer to P.13A-375) using an
oscilloscope.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-291
STEP 9. Replace camshaft position sensor.
• After replacing the camshaft position sensor,
re-check the trouble symptoms.
Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).

Inspection Procedure 17: Run on (Dieseling)

COMMENT ON TROUBLE SYMPTOM DIAGNOSIS PROCEDURE

• Failure is possibly caused by leakage from
injector.
STEP 1. Check injector for spray condition.
PROBABLE CAUSE • Check each injector for spray condition (Refer to
• Failed injector P.13A-393).
• Failed engine-ECU <M/T> Q: Does trouble symptom persist?
• Failed engine-A/T-ECU <A/T> YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Replace injector.

Inspection Procedure 18: Odor, White Smoke, Black Smoke, and High-Concentration CO/HC during
Idling

COMMENT ON TROUBLE SYMPTOM YES : Inspection chart for diagnosis code (Refer
• Failure is possibly caused by improper air-fuel to P.13A-16).
ratio, deteriorated catalyst, failed ignition system, NO : Go to Step 2 .
failed fuel system, failed compression pressure or
other faults. STEP 2. Check injector for operating sound.
• Check injector for operating sound (Refer to
PROBABLE CAUSE
P.13A-393).
• Incorrect air-fuel ratio
• Failed ignition system Q: Can operating sound be heard?
• Failed fuel system YES : Go to Step 3 .
• Failed intake and exhaust system NO : Check the injector system of the defective
• Failed emission control system cylinder.
• Failed compression pressure (Refer to P.13A-108, Code P0201: No. 1
• Failed catalytic converter injector System)
• Failed engine-ECU <M/T> (Refer to P.13A-113, Code P0202: No. 2
• Failed engine-A/T-ECU <A/T> injector System)
(Refer to P.13A-118, Code P0203: No. 3
DIAGNOSIS PROCEDURE injector System)
(Refer to P.13A-123, Code P0204: No. 4
injector System)
STEP 1. MUT-II/III diagnosis code
Q: Diagnosis code set?
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-292 TROUBLESHOOTING

STEP 3. Check ignition timing. STEP 9. Check purge control solenoid valve
• Check ignition timing. (Refer to GROUP 11A − itself.
On-vehicle Service P.11A-11). • Check purge control solenoid valve itself (Refer
Q: Is the check result normal?
to GROUP 17 − Emission Control System −
YES : Go to Step 4 . Evaporative Emission Control System P.17-12).
NO : Check for offset ignition timing (Refer to Q: Is the check result normal?
Inspection Procedure 16 P.13A-289). YES : Go to Step 10 .
NO : Replace purge control solenoid valve.
STEP 4. MUT-II/III data list
• Refer to data list reference table P.13A-361. STEP 10. Check EGR control solenoid valve
a. Item 13: Intake air temperature sensor itself.
b. Item 21: Engine coolant temperature sensor • Check EGR control solenoid valve itself [Refer to
c. Item 32: Manifold absolute pressure sensor GROUP 17 − Emission Control System −
Q: Are the check results normal?
Exhaust Gas Recirculation (EGR) System
YES : Go to Step 5 . P.17-17].
NO : Perform the diagnosis code classified check Q: Is the check result normal?
Procedure for the sensor that has shown an YES : Go to Step 11 .
abnormal data value (Refer to Inspection NO : Replace EGR control solenoid valve.
Chart for diagnosis codes P.13A-16).
STEP 11. Check EGR valve itself.
STEP 5. Check air intake from intake hose and • Check EGR valve itself [Refer to GROUP 17 −
inlet manifold. Emission Control System − Exhaust Gas
Q: Is the check result normal?
Recirculation (EGR) System P.17-16].
YES : Go to Step 6 . Q: Is the check result normal?
NO : Repair. YES : Go to Step 12 .
NO : Replace EGR valve.
STEP 6. Check for emission leakage from
exhaust manifold. STEP 12. Fuel pressure measurement.
Q: Is the check result normal?
• Fuel pressure measurement (Refer to
YES : Go to Step 7 . P.13A-384).
NO : Repair. Q: Is the check result normal?
YES : Go to Step 13 .
NO : Repair.
STEP 7. Check throttle body (throttle valve
portion) for contamination.
Q: Is the check result normal?
STEP 13. Check positive crankcase ventilation
YES : Go to Step 8 . valve itself.
NO : Clean throttle body (throttle valve portion) • Check positive crankcase ventilation valve itself
(Refer to P.13A-383). (Refer to GROUP 17 − Emission Control System
− crankcase Emission Control System P.17-9).

STEP 8. MUT-II/III data list Q: Is the check result normal?

• Refer to data list reference table P.13A-361. YES : Go to Step 14 .
NO : Replace positive crankcase ventilation
a. Item 11: Oxygen sensor (front)
valve.
Q: Is the check result normal?
YES : Go to Step 9 .
NO : Check oxygen sensor (front) system (Refer
to Code No. P0130 P.13A-70).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-293
STEP 14. Check spark plug. STEP 17. Check compression pressure.
Q: Is the check result normal?
• Check compression pressure (Refer to GROUP
YES : Go to Step 15 . 11A − On-vehicle Service P.11A-13).
NO : Replace spark plug. Q: Is the check result normal?
YES : Go to Step 18 .
NO : Repair.
STEP 15. Check resistive cord itself.
• Check resistive cord itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-32). STEP 18. Check injector for spraying condition.
Q: Is the check result normal?
• Check each injector for spray condition (Refer to
YES : Go to Step 16 . P.13A-393).
NO : Replace resistive cord. Q: Does trouble symptom persist?
YES : Go to Step 19 .
NO : Replace injector.
STEP 16. Check ignition coil itself.
• Check ignition coil itself (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-32). STEP 19. Replace catalytic converter.
Q: Is the check result normal?
• After replacing the catalytic converter, re-check
YES : Go to Step 17 . the trouble symptoms.
NO : Replace ignition coil. Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
NO : Check end.

Inspection Procedure 19: Battery Rundown

COMMENT ON TROUBLE SYMPTOM STEP 2. Connector check: B-18 intermediate

• Failure is possibly caused by failed alternator, connector
failed generation control circuit or other faults.
Connector: B-18
PROBABLE CAUSE
• Failed battery
• Alternator G terminal short-circuited
• Failed alternator B-18 (B)
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T> 3 2 1
6 5 4
DIAGNOSIS PROCEDURE Female side
connector
AK301242AB
NOTE: .
*1: L.H. drive vehicles
Q: Is the check result normal?
*2: R.H. drive vehicles
YES : Go to Step 3 .
NO : Repair or replace.
STEP 1. Check battery voltage.
• Measure battery voltage during cranking.
OK: 8 V or more
Q: Is the check result normal?
YES : Go to Step 2 .
NO : Check battery (Refer to GROUP 54A −
Battery − On-vehicle Service − Battery test
P.54A-5).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-294 TROUBLESHOOTING

STEP 3. Perform voltage measurement at B-18 STEP 4. Connector check: C-201 ignition switch
intermediate connector. connector
Connector: B-18 Connector: C-201
<L. H. drive vehicles>

B-18 (B)

C-201
1 2 3
4 5 6
Male side
connector
AK301154 AB

• Disconnect connector, and measure at male

connector side. <R. H. drive vehicles>
• Ignition switch: ON
• Voltage between terminal No. 5 and earth.
OK: System voltage
Q: Is the check result normal? C-201
YES : Go to Step 5 .
NO : Go to Step 4 .

3 2 1
6 5 4
Harness side connector
AK301346 AB

Connector: B-18

B-18 (B)

1 2 3
4 5 6
Male side
connector
AK301154 AB

Q: Is the check result normal?

YES : Check intermediate connectors C-04,
C-13*1, C-137*2, C-03*2, C-212 and C-210,
and repair if necessary. If intermediate
connectors are normal, check and repair
harness between B-18 (terminal No. 5)
intermediate connector and C-201 (terminal
No. 2) ignition switch connector.
• Check power supply line for
open/short circuit.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-295
STEP 5. Perform voltage measurement at B-18 STEP 7. Check harness between B-18 (terminal
intermediate connector. No. 4) intermediate connector and B-26 (terminal
No. 1) alternator connector.
Connector: B-18
Connector: B-18

B-18 (B)
B-18 (B)
3 2 1
6 5 4 3 2 1
Female side 6 5 4
connector Female side
AK301242AB
connector
AK301242AB
• Disconnect connector, and measure at female
connector side.
Connector: B-26
• Ignition switch: ON
• Voltage between terminal No. 4 and earth. B-26 (GR)
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 10 . M
NO : Go to Step 6 . 4 3 2 1
Harness side
connector
STEP 6. Connector check: B-26 alternator
connector AK301155AB

• Check output line for short circuit.

Connector: B-26
Q: Is the check result normal?
B-26 (GR) YES : Go to Step 8 .
NO : Repair.

M
4 3 2 1
Harness side
connector

AK301155AB

Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-296 TROUBLESHOOTING

STEP 8. Check harness between B-18 (terminal STEP 9. Check harness between B-26 (terminal
No. 5) intermediate connector and B-26 (terminal No. 3) alternator connector and C-201 (terminal
No. 3) alternator connector. No. 2) ignition switch connector.
Connector: B-18 Connector: B-26

B-26 (GR)

B-18 (B)
M
3 2 1 4 3 2 1
6 5 4 Harness side
connector
Female side
connector
AK301242AB
AK301155AB

Connector: B-26 Connector: C-201

<L. H. drive vehicles>
B-26 (GR)

M
C-201
4 3 2 1
Harness side
connector

AK301155AB

• Check power supply line for open/short circuit.

Q: Is the check result normal? <R. H. drive vehicles>
YES : Go to Step 9 .
NO : Repair.

C-201

3 2 1
6 5 4
Harness side connector
AK301346 AB

NOTE: Before checking harness, check intermediate

connectors C-04, C-13*1, C-137*2, C-03*1, C-212
and C-210 and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Replace alternator.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-297
STEP 10. Connector check: C-125 engine-ECU STEP 11. Perform voltage measurement at C-125
<M/T> connector or C-122 engine-A/T-ECU <A/T> engine-ECU <M/T> connector or C-122
connector engine-A/T-ECU <A/T> connector.
Connector: C-125 Connector: C-125
<L. H. drive vehicles> <L. H. drive vehicles>

C-125 (Y) C-125 (Y)

<R. H. drive vehicles> <R. H. drive vehicles>

C-125 (Y) C-125 (Y)

38 37 36 35 34 33 32 31 38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39 46 45 44 43 42 41 40 39
Harness side connector Harness side connector
AK301135 AB AK301135 AB

Connector: C-122 Connector: C-122

<L. H. drive vehicles> <L. H. drive vehicles>

C-122 (GR) C-122 (GR)

<R. H. drive vehicles> <R. H. drive vehicles>

C-122 (GR) C-122 (GR)

77 76 75 74 73 72 71 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 100 99 98 97 96 95 94 93 92 91
Harness side connector Harness side connector
AK301123 AB AK301123 AB

Q: Is the check result normal?

YES : Go to Step 11 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-298 TROUBLESHOOTING

Connector: B-18 Connector: C-122

<L. H. drive vehicles>

B-18 (B)

1 2 3 C-122 (GR)
4 5 6
Male side
connector <R. H. drive vehicles>
AK301154 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Voltage between terminal No. 33 <M/T> or
terminal No. 8 <A/T> and earth. C-122 (GR)
OK: System voltage 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
Q: Is the check result normal? 100 99 98 97 96 95 94 93 92 91
YES : Go to Step 12 . Harness side connector
NO : Check and repair harness between B-18 AK301123 AB

(terminal No. 4) intermediate connector and • Measure engine-ECU <M/T> or engine-A/T-ECU

C-125 (terminal No. 33) engine-ECU <M/T> <A/T> terminal voltage.
connector or C-122 (terminal No. 8) • Engine: Idling after warm-up
engine-A/T-ECU <A/T> connector. • Transmission: Neutral <M/T> or P range <A/T>
• Check output line for short circuit. • Radiator fan: Inactive
• Voltage between terminal No. 33 <M/T> or
STEP 12. Perform voltage measurement at C-125 terminal No. 8 <A/T> and earth.
engine-ECU <M/T> connector or C-122 OK: Switching the headlamps to ON from
engine-A/T-ECU <A/T> connector. OFF causes the voltage to increase by 0.2 −
Connector: C-125
3.5 V.
<L. H. drive vehicles> Q: Is the check result normal?
YES : Go to Step 13 .
NO : Check alternator.

STEP 13. Check the trouble symptoms.

C-125 (Y)
Q: Does trouble symptom persist?
YES : Replace engine-ECU <M/T> or
<R. H. drive vehicles>
engine-A/T-ECU <A/T>.
NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
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13A-299

Inspection Procedure 20: Overheating

COMMENT ON TROUBLE SYMPTOM STEP 3. MUT-II/III actuator test

• Failure is possibly caused by failed engine • Refer to actuator test reference table P.13A-367.
cooling system, failed fan controller, failed engine a. Item 21: Fan controller
coolant temperature sensor or other faults.
OK: Fan motor rotating
PROBABLE CAUSE Q: Is the check result normal?
• Insufficient or deteriorated engine coolant YES : Go to Step 4 .
• Failed fan controller NO : Check fan control relay system (Refer to
• Failed engine coolant temperature sensor Inspection Procedure 25 P.13A-329).
• Failed thermostat
• Failed water pump
STEP 4. MUT-II data list
• Failed radiator core
• Refer to data list reference table P.13A-361.
• Failed engine-ECU <M/T>
a. Item 21: Engine coolant temperature sensor
• Failed engine-A/T-ECU <A/T>
OK:
DIAGNOSIS PROCEDURE Engine cold state: At ambient temperature or
equivalent.
Engine hot state: At 80 − 120°C
STEP 1. MUT-II/III diagnosis code
Q: Is the check result normal?
Q: Diagnosis code set? YES : Go to Step 5 .
YES : Inspection chart for diagnosis code (Refer NO : Check engine coolant temperature sensor
to P.13A-16). system (Refer to Code No. P0115
NO : Go to Step 2 . P.13A-41).

STEP 2. Check engine coolant. STEP 5. Check thermostat.

NOTE: If engine coolant level falls too early, check • Check thermostat (Refer to GROUP 14 −
for leaky spots, and repair if necessary. Thermostat P.14-27).
• Check engine coolant (Refer to GROUP 14 − Q: Is the check result normal?
On-vehicle Service P.14-22). YES : Go to Step 6 .
Q: Is the check result normal? NO : Replace thermostat.
YES : Go to Step 3 .
NO : Replace or add engine coolant.
STEP 6. Check water pump.
• Check water pump.
Q: Is the check result normal?
YES : Replace radiator.
NO : Replace water pump.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-300 TROUBLESHOOTING

Inspection Procedure 21: Abnormal Rotation of Fan Motor

Fan controller (radiator fan, A/C condensor fan) circuit

5V
A-18
(MU802322)

1 2 3 Fan controller

2
L
12
C-111 (*4)

1
A-13 (*3)

21 (*1) or
18 (*2)
C-122 (*2) C-123 (*1)
(MU803784) (MU801824)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 1 2 3 4 5 6 7 8 9 10 11 12 13
24 25 26 27 28 29 30 3132 33 34 35 14 15 16 17 18 19 20 21 22 23 24 25 26

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301353 AB

OPERATION FUNCTION
• The control (duty) signal is inputted to the fan • The engine-ECU <M/T> or engine-A/T-ECU
controller (terminal No. 2) from the engine-ECU <A/T> inputs a duty signal suitable for the engine
(terminal No. 21) <M/T> or engine-A/T-ECU coolant temperature, vehicle speed and A/C
(terminal No. 18) <A/T>. switch position to the fan controller. In response
to the signal, the fan controller controls the
rotating speeds of the radiator fan and A/C
condenser fan (The fan speed becomes higher
as the average voltage of the terminal comes
nearer to 5V).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-301
PROBABLE CAUSE DIAGNOSIS PROCEDURE
• Failed fan controller
NOTE: .
• Open/short circuit in fan controller circuit or loose
*1: L.H. drive vehicles
connector contact
*2: R.H. drive vehicles
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
STEP 1. Connector check: C-123 engine-ECU
<M/T> connector or C-122 engine-A/T-ECU <A/T>
connector
Connector: C-123
<L. H. drive vehicles>

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 2 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-302 TROUBLESHOOTING

STEP 2. Check at C-123 engine-ECU <M/T> STEP 3. Check the trouble symptoms.
connector or C-122 engine-A/T-ECU <A/T> Q: Does trouble symptom persist?
connector. YES : Replace engine-ECU <M/T> or
Connector: C-123 engine-A/T-ECU <A/T>.
<L. H. drive vehicles> NO : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Short-circuit terminal No. 21 <M/T> or terminal
No. 18 <A/T> to earth.
OK: Fan motor stops rotating.
Q: Is the check result normal?
YES : Go to Step 3 .
NO : Go to Step 4 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-303
STEP 4. Perform voltage measurement at C-123 STEP 5. Connector check: A-18 fan controller
engine-ECU <M/T> connector or C-122 connector
engine-A/T-ECU <A/T> connector. Connector: A-18
Connector: C-123 3 2 1
<L. H. drive vehicles> Harness side
connector

C-123 (Y)
A-18 (GR)
<R. H. drive vehicles> AK301354 AB

Q: Is the check result normal?

YES : Go to Step 6 .
NO : Repair or replace.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Voltage between terminal No. 21 <M/T> or
terminal No. 18 <A/T> and earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Replace fan controller.
NO : Go to Step 5 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-304 TROUBLESHOOTING

STEP 6. Check harness between A-18 (terminal Connector: C-122

No. 2) fan controller connector and C-123 <L. H. drive vehicles>
(terminal No. 21) engine-ECU <M/T> connector or
C-122 (terminal No. 8) engine-A/T-ECU <A/T>
connector.
Connector: A-18
3 2 1 C-122 (GR)
Harness side
connector
<R. H. drive vehicles>

A-18 (GR)
AK301354 AB C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

NOTE: Before checking harness, check intermediate

C-123 (Y) connector A-13*1, C-111*2, and repair if necessary.
• Check output line for open circuit.
<R. H. drive vehicles> Q: Is the check result normal?
YES : Replace fan controller.
NO : Repair.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-305

Inspection Procedure 22: Poor A/C Performance

COMMENT ON TROUBLE SYMPTOM STEP 3. MUT-II/III data list

• Failure is possibly caused by short /overcharged • Refer to data list reference table P.13A-361.
A/C refrigerant, failed A/C control system, failed a. Item 28: A/C switch
fan control system or other faults. • Engine: Idling
PROBABLE CAUSE • A/C set temperature:
• Short or overcharged A/C refrigerant Maximum Cool when temperature in cabin is
• Failed A/C compressor relay 25°C or more
• Failed fan controller Maximum Hot when temperature in cabin is
• Failed A/C-ECU 25°C or less
• Failed engine-ECU <M/T> OK:
• Failed engine-A/T-ECU <A/T> ON (when A/C is ON)
OFF (when A/C is OFF)
DIAGNOSIS PROCEDURE Q: Is the check result normal?
YES : Go to Step 4 .
NO : Check A/C switch (Refer to Inspection
STEP 1. MUT-II/III diagnosis code
Procedure 26 P.13A-337).
Q: Diagnosis code set?
YES : Inspection chart for diagnosis code (Refer
to P.13A-16). STEP 4. MUT-II/III data list
NO : Go to Step 2 . • Refer to data list reference table P.13A-361.
a. Item 49: A/C relay
• Engine: Running at idle
STEP 2. A/C compressor magnet clutch • A/C set temperature:
operation check. Maximum Cool when temperature in cabin is
• Engine: Idling 25°C or more.
• A/C set temperature: Maximum Hot when temperature in cabin is
Maximum Cool when temperature in cabin is 25°C or less.
25°C or more
OK:
Maximum Hot when temperature in cabin is 25°C
ON (when A/C is ON)
or less
OFF (when A/C is OFF)
OK:
Magnet clutch active (when A/C is ON) Q: Is the check result normal?
Magnet clutch inactive (when A/C is OFF) YES : Check Air conditioner (Refer to GROUP 55
− Troubleshooting P.55-4).
Q: Is the check result normal? NO : Check A/C system (Refer to inspection
YES : Go to Step 5 . procedure 26 P.13A-337).
NO : Go to Step 3 .

STEP 5. Check charged amount of A/C

refrigerant.
• Check charged amount of A/C refrigerant (Refer
to GROUP 55 − On-vehicle Service P.55-71).
Q: Is the check result normal?
YES : Go to Step 6 .
NO : Adjust charged amount of A/C refrigerant.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-306 TROUBLESHOOTING

STEP 6. MUT-II/III actuator test

• Refer to actuator test reference table P.13A-367.
a. Item 21: Fan controller
OK: Fan motor rotates.
Q: Is the check result normal?
YES : Check A/C load signal system (Refer to
Inspection Procedure 27 P.13A-341).
NO : Check fan control relay system (Refer to
Inspection Procedure 25P.13A-329).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-307

Inspection Procedure 23: Engine-ECU<M/T> or Engine-A/T-ECU<A/T> Power Supply, Engine Control

Relay, Ignition Switch-IG1 System

Power supply and ignition switch-IG circuit

Battery

W W

8
Relay box
20 A Ignition switch
C-201

R LOCK
1 2 3
ST ACC
B-Y IG1 IG2 4 5 6
7 <A-13> (*3) or
11 <C-111> (*4)
2

B-W
C-210
6

B-Y B-Y 8
J/B
7.5 A
B-16X 1 2
1
1 2 Engine C-212
control
3 4 relay

4 3 L

R-Y

28
4
J/C (6) C-14(*3) or
C-12(*3) or B-Y B-Y
C-136(*4)
C-134(*4)
30 31 B-R
R-Y R-Y
13(*1) or 26(*1) or 12(*1) or 25(*1) or 38(*1) or 80(*1) or 82(*1) or
B B 48(*2) 42(*2) 41(*2) 47(*2) 49(*2) 66(*2) 98(*2)

GND GND
Power Back-up Engine-ECU <M/T>
source power supply or
Engine-A/T-ECU <A/T>

C-123(*1) C-125(*1) C-129(*1)

(MU801824) (MU801822) (MU801823)

1 2 3 4 5 6 7 8 9 10 11 12 13 31 32 33 34 35 36 37 38 71 72 73 74 75 76 77 78 79 80 81
14 15 16 17 18 19 20 21 22 23 24 25 26 39 40 41 42 43 44 45 46 82 83 84 85 86 87 88 89 90 9192

C-124(*2) C-126(*2)
(MU803781) (MU803782)
41 42 43 44 45 46 71 72 73 74 75 76 77
47 48 49 50 51 52 53 54 55 56 57 78 79 80 81 8283 8485 8687 88 89
58 59 60 61 62 63 64 65 66 90 91 92 93 94 9596 97 98
NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301355 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-308 TROUBLESHOOTING

OPERATION STEP 2. Connector check: B-16X engine control

• The battery voltage is applied to the engine relay connector
control relay (terminal No. 1 and 2).
• The engine-ECU (terminal No. 38) <M/T> or Connector: B-16X
B-16X
engine-A/T-ECU (terminal No. 49) <A/T> makes
the power transistor in the unit be in "ON" Relay box’s
triangle marks
position and makes currents go on the engine
control relay coil, and that makes the relay be in
"ON" position. 2 1
• When the engine control relay is in "ON" position,
the battery voltage is supplied to the engine-ECU 4 3
<M/T> or engine-A/T-ECU <A/T>, the sensor and Harness side
connector AK301121 AB
the actuator from the engine control relay
(terminal No. 1).
Q: Is the check result normal?
• The engine-ECU (terminal No. 13, No. 26) or
YES : Go to Step 3 .
engine-A/T-ECU (terminal No. 42, No. 48) is
NO : Repair or replace.
grounded to the vehicle body.

FUNCTION STEP 3. Check engine control relay.

• When the ignition switch ON signal is input to the • Check engine control relay (Refer to P.13A-389).
engine-ECU <M/T> or engine-A/T-ECU <A/T>,
Q: Is the check result normal?
the engine-ECU <M/T> or engine-A/T-ECU YES : Go to Step 4 .
<A/T> places the engine control relay in the ON NO : Replace engine control relay.
position. Accordingly, the battery voltage is
supplied to the engine-ECU <M/T> or
engine-A/T-ECU <A/T>, sensor and actuator. STEP 4. Perform voltage measurement at B-16X
engine control relay connector.
PROBABLE CAUSE
Connector: B-16X
• Failed engine control relay B-16X
• Open/short circuit in engine control relay circuit or
Relay box’s
loose connector contact triangle marks
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
2 1
DIAGNOSIS PROCEDURE 4 3
NOTE: . Harness side
*1: L.H. drive vehicles connector AK301121 AB
*2: R.H. drive vehicles • Remove relay, and measure at relay box side.
• Voltage between terminal No. 1 and earth, also
STEP 1. Check battery voltage. between terminal No. 2 and earth.
• Measure battery voltage during cranking. OK: System voltage
OK: 8 V or more Q: Is the check result normal?
Q: Is the check result normal? YES : Go to Step 5 .
YES : Go to Step 2 . NO : Check intermediate connector C-13*1,
NO : Check battery (Refer to GROUP 54A − C-111*2, and repair if necessary. If
Battery − On-vehicle Service − Battery test intermediate connector is normal, check and
P.54A-5). repair harness between B-16X (terminal No.
1) engine control relay connector and
battery.
• Check power supply line for
open/short circuit.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-309
STEP 5. Perform voltage measurement at C-129 STEP 6. Connector check: C-129 engine-ECU
engine-ECU <M/T> connector or C-126 <M/T> connector or C-126 engine-A/T-ECU <A/T>
engine-A/T-ECU <A/T> connector. connector
Connector: C-129 Connector: C-129
<L. H. drive vehicles> <L. H. drive vehicles>

C-129 (Y) C-129 (Y)

<R. H. drive vehicles> <R. H. drive vehicles>

C-129 (Y) C-129 (Y)

8180 79 78 77 76 75 74 73 72 71 8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82 92 91 90 89 88 87 86 85 84 83 82
Harness side connector Harness side connector
AK301111AB AK301111AB

Connector: C-126 Connector: C-126

<L. H. drive vehicles> <L. H. drive vehicles>

C-126 (GR) C-126 (GR)

<R. H. drive vehicles> <R. H. drive vehicles>

C-126 (GR) C-126 (GR)

77 76 75 74 73 72 71 77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78 89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90 98 97 96 95 94 93 92 91 90
Harness side connector Harness side connector
AK301118 AB AK301118 AB

Q: Is the check result normal?

• Disconnect connector, and measure at harness
YES : Go to Step 6 . side.
NO : Repair or replace. • Ignition switch: ON
• Voltage between terminal No. 82 <M/T> or
terminal No. 98 <A/T> and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 9 .
NO : Go to Step 7 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-310 TROUBLESHOOTING

STEP 7. Connector check: C-201 ignition switch STEP 8. Check ignition switch.
connector
Connector: B-104, B-113
3 2 1
Connector: C-201
Harness side
<L. H. drive vehicles> connector

C-201 B-104 (GR)

B-113 (GR)
AK301352 AB

Connector: C-129
<L. H. drive vehicles>
<R. H. drive vehicles>

C-129 (Y)
C-201

<R. H. drive vehicles>

3 2 1 C-129 (Y)
6 5 4
Harness side connector
AK301346 AB 8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Q: Is the check result normal? Harness side connector
AK301111AB
YES : Go to Step 8 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-311

Connector: C-126 STEP 9. Perform voltage measurement at C-129

<L. H. drive vehicles> engine-ECU <M/T> connector or C-124
engine-A/T-ECU <A/T> connector.
Connector: C-129
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-129 (Y)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90 C-129 (Y)
Harness side connector
AK301118 AB

• Check ignition switch (Refer to GROUP 54A − 8180 79 78 77 76 75 74 73 72 71

Ignition Switch − Ignition Switch P.54A-98). 92 91 90 89 88 87 86 85 84 83 82
Harness side connector
Q: Is the check result normal? AK301111AB

YES : • Check intermediate connectors C-14*1,

Connector: C-124
C-136*2, C-210 and C-212 and repair if <L. H. drive vehicles>
necessary. If intermediate connectors
are normal, check and repair harness
between C-129 (terminal No. 82)
engine-ECU <M/T> connector or C-126
(terminal No. 98) engine-A/T-ECU <A/T> C-124 (GR)
connector and C-201 (terminal No. 2)
ignition swich connector.
• Check power supply line for open/short <R. H. drive vehicles>
circuit.
NO : Replace ignition switch.

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Voltage between terminal No. 80 <M/T> or
terminal No. 66 <A/T> and earth.
OK: System voltage
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-312 TROUBLESHOOTING

Q: Is the check result normal?

STEP 10. Connector check: C-123 engine-ECU
YES : Go to Step 10 .
NO : • Check intermediate connector A-13*1,
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
C-111*2 and repair if necessary. If
intermediate connector is normal, check Connector: C-123
and repair harness between C-129 <L. H. drive vehicles>
(terminal No. 80) engine-ECU <M/T>
connector or C-124 (terminal No. 66)
engine-A/T-ECU <A/T> connector and
battery.
C-123 (Y)
• Check power supply line for short circuit.

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

Q: Is the check result normal?

YES : Go to Step 11 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-313
Q: Is the check result normal?
STEP 11. Perform resistance measurement at
YES : Go to Step12 .
C-123 engine-ECU <M/T> or C-124 NO : Check and repair harness between C-123
engine-A/T-ECU <A/T> connector. (terminal No. 13, No. 26) engine-ECU
Connector: C-123 <M/T> connector or C-124 (terminal No. 42,
<L. H. drive vehicles> No. 48) engine-A/T-ECU <A/T> connector
and body earth.
• Check earthing line for open circuit
and damege.

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-124
<L. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Disconnect connector, and measure at harness

side.
• Resistance between terminal No. 13 <M/T> or
No. 26 <A/T> and earth, and No. 26 <M/T> or No.
42 <A/T> and earth.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-314 TROUBLESHOOTING

STEP 12. Connector check: C-125 engine-ECU STEP 13. Perform voltage measurement at C-125
<M/T> connector or C-124 engine-A/T-ECU <A/T> engine-ECU <M/T> connector or C-124
connector engine-A/T-ECU <A/T> connector.
Connector: C-125 Connector: C-125
<L. H. drive vehicles> <L. H. drive vehicles>

C-125 (Y) C-125 (Y)

<R. H. drive vehicles> <R. H. drive vehicles>

C-125 (Y) C-125 (Y)

38 37 36 35 34 33 32 31 38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39 46 45 44 43 42 41 40 39
Harness side connector Harness side connector
AK301135 AB AK301135 AB

Connector: C-124 Connector: C-124

<L. H. drive vehicles> <L. H. drive vehicles>

C-124 (GR) C-124 (GR)

<R. H. drive vehicles> <R. H. drive vehicles>

C-124 (GR) C-124 (GR)

46 45 44 43 42 41 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47 57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58 66 65 64 63 62 61 60 59 58

Harness side connector Harness side connector

AK301112 AB AK301112 AB

Q: Is the check result normal?

YES : Go to Step 13 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-315

Connector: B-16X Connector: C-124

B-16X
<L. H. drive vehicles>
Relay box’s
triangle marks

2 1 C-124 (GR)
4 3
Harness side <R. H. drive vehicles>
connector AK301121 AB

• Disconnect connector, and measure at harness

side.
• Voltage between terminal No. 38 <M/T> or
terminal No. 49 <A/T> and earth.
OK: System voltage C-124 (GR)

Q: Is the check result normal? 46 45 44 43 42 41

57 56 55 54 53 52 51 50 49 48 47
YES : Go to Step 14 . 66 65 64 63 62 61 60 59 58
NO : Check and repair harness between B-16X
Harness side connector
(terminal No. 3) engine control relay AK301112 AB
connector and C-125 (terminal No. 38) • Disconnect connector, and measure at harness
engine-ECU <M/T> connector or C-124 side.
(terminal No. 49) engine-A/T-ECU <A/T> • Using jumper wire, connect C-125 (terminal No.
connector. 38) engine-ECU <M/T> connector or C-124
• Check earthing line for open/short (terminal No. 49) engine-A/T-ECU <A/T> and
circuit. earth.
• Voltage between terminal No. 12 <M/T> or
STEP 14. Perform voltage measurement at C-123 terminal No. 41 <A/T> and earth, and terminal
engine-ECU <M/T> connector or C-124 No. 25 <M/T> or terminal No. 47 <A/T> and
engine-A/T-ECU <A/T> connector. earth.
Connector: C-123 OK: System voltage
<L. H. drive vehicles> Q: Is the check result normal?
YES : Go to Step 15 .
NO : Check intermediate connector C-12*1,
C-134*2 and repair if necessary. If
intermediate connector is normal, check and
C-123 (Y)
repair harness between C-123 (terminal No.
12, No. 25) engine-ECU <M/T> connector
<R. H. drive vehicles> or C-124 (terminal No. 41, No. 47)
engine-A/T-ECU <A/T> connector and
B-16X (terminal No. 4) engine-control relay.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-316 TROUBLESHOOTING

STEP 15. Check harness between C-201 (terminal Connector: C-126

No. 2) ignition switch connector and C-129 <L. H. drive vehicles>
(terminal No. 82) engine-ECU <M/T> connector or
C-126 (terminal No. 98) engine-A/T-ECU <A/T>
connector.
Connector: C-201 C-126 (GR)
<L. H. drive vehicles>

<R. H. drive vehicles>

C-201

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
<R. H. drive vehicles> 98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

NOTE: Before checking harness, check intermediate

C-201
connectors C-14*1, C-136*2, C-212 and C-210 and
repair if necessary.
• Check output line for open/short circuit.
Q: Is the check result normal?
YES : Go to Step 16 .
NO : Repair.

3 2 1
STEP 16. Check harness between B-16X
6 5 4
(terminal No. 1, No. 2) engine control relay
Harness side connector
connector and battery.
AK301346 AB
Connector: B-16X
Connector: C-129 B-16X
<L. H. drive vehicles>
Relay box’s
triangle marks

2 1
C-129 (Y)
4 3
Harness side
<R. H. drive vehicles> connector AK301121 AB

NOTE: Before checking harness, check intermediate

connector A-13*2, C-111*2, and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
C-129 (Y)
YES : Go to Step 17 .
NO : Repair.

8180 79 78 77 76 75 74 73 72 71
92 91 90 89 88 87 86 85 84 83 82
Harness side connector
AK301111AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-317
STEP 17. Check harness between B-16X Connector: C-124
(terminal No. 3) engine control relay connector <L. H. drive vehicles>
and C-125 (terminal No. 38) engine-ECU <M/T>
connector or C-124 (terminal No. 49)
engine-A/T-ECU <A/T> connector.
Connector: B-16X
B-16X C-124 (GR)

Relay box’s
triangle marks <R. H. drive vehicles>

2 1
4 3
Harness side
connector AK301121 AB C-124 (GR)

Connector: C-125 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

• Check earthing line for damage.

C-125 (Y) Q: Is the check result normal?

YES : Go to Step 18 .
NO : Repair.
<R. H. drive vehicles>

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-318 TROUBLESHOOTING

STEP 18. Check harness between B-16X Connector: C-124

(terminal No. 4) engine control relay connector <L. H. drive vehicles>
and C-123 (terminal No. 12, No. 25) engine-ECU
<M/T> connector or C-124 (terminal No. 41, No.
47) engine-A/T-ECU <A/T> connector.
Connector: B-16X
B-16X C-124 (GR)

Relay box’s
triangle marks <R. H. drive vehicles>

2 1
4 3
Harness side
connector AK301121 AB C-124 (GR)

Connector: C-123 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<L. H. drive vehicles> 66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

NOTE: Before checking harness, check intermediate

C-123 (Y) connector C-12*1, C-134*2 , and repair if necessary.
• Check output line for damage.
<R. H. drive vehicles> Q: Is the check result normal?
YES : Go to Step 19 .
NO : Repair.

STEP 19. Check the trouble symptoms.

Q: Does trouble symptom persist?
C-123 (Y)
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
13 12 11 10 9 8 7 6 5 4 3 2 1 NO : Intermittent malfunction (Refer to GROUP
26 25 24 23 22 21 20 19 18 17 16 15 14 00 − How to Use Troubleshooting/Inspection
Harness side connector Service Points P.00-6).
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-319

Inspection Procedure 24: Fuel Pump System

Fuel pump circuit

Battery
C-201
W W
R LOCK
1 2 3 Ignition switch
ST ACC
4 5 6 IG1 IG2
15
Relay box
15 A 2

GR
C-27(*3) or
C-115(*4) B-W
9
W
C-209 C-210
2 6

2 1 3 1 8
C-220 C-222 7.5 A
1 2 1 2
OFF ON OFF ON J/B
3 4 3 4 Fuel Fuel
pump 3 4 pump 2 4
relay (1) relay (2)
C-222 C-220

11 1 <C-215> (*3) or 14
C-212 13 <C-212> (*4) R C-212

7
C-120(*4)
B R
V
5
D-18 R
D-16
(MU802058) 5

1 2 3 Fuel
M pump
4 5

4 2
C-14(*3) or C-136(*4)
B
D-18
C-123(*1) 4
(MU801824)
V
B
1 2 3 4 5 6 7 8 9 10 11 12 13
14 15 16 17 18 19 20 21 22 23 24 25 26 22(*1) or
21(*2)
C-122(*2)
(MU803784)
1 2 3 4 5 6 7 8 Engine-ECU <M/T>
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 or
24 25 26 27 28 29 30 3132 33 34 35 Engine-A/T-ECU <A/T>

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301356 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-320 TROUBLESHOOTING

OPERATION STEP 1. Connector check: C-222 fuel pump relay

• The battery voltage is applied to the fuel pump (1) connector and C-220 fuel pump relay (2)
relay (1) (terminal No. 1) form the ignition switch connector
and is earthed to the vehicle body from the fuel
pump relay (1) (terminal No. 4). Connector: C-220, C-222
• The battery voltage is applied to the fuel pump
C-222 Junction block’s
relay (1) (terminal No. 2) and to the fuel pump triangle marks
relay (2) (terminal No. 3) from the fuel pump relay C-220
(1) (terminal No. 3).
• The battery voltage is applied to the fuel pump 2 1
relay (2) (terminal No. 1) from the ignition switch. 4 3
The engine-ECU (terminal No. 22) <M/T> or Harness side
connector
engine-A/T-ECU (terminal No. 21) <A/T> makes
the power transistor in the unit be in "ON" AK301357AB

position and makes currents go on the fuel pump

Q: Is the check result normal?
relay (2) coil, and that makes the relay be in "ON"
YES : Go to Step 2 .
position.
NO : Repair or replace.
• When the fuel pump relay (2) is in "ON" position,
the battery voltage is supplied to the fuel pump
from the fuel pump relay (2) (terminal No. 2). STEP 2. Check fuel pump relay.
• Fuel pump relay, continuity check (Refer to
FUNCTION P.13A-389).
• When the ignition switch ON signal is input to the
Q: Is the check result normal?
engine-ECU <M/T> or engine-A/T-ECU <A/T>, YES : Go to Step 3 .
the engine-ECU <M/T> or engine-A/T-ECU NO : Replace fuel pump relay.
<A/T> places the fuel pump relay in the "ON"
position. Accordingly, the battery voltage is
supplied to the fuel pump. STEP 3. Perform resistance measurement at
C-222 fuel pump relay (1) connector.
PROBABLE CAUSE Connector: C-222
• Failed fuel pump relay
Junction block’s
• Failed fuel pump C-222 triangle marks
• Open/short circuit in fuel pump drive circuit or
loose connector contact
2 1
• Failed engine-ECU <M/T>
4 3
• Failed engine-A/T-ECU <A/T>
Harness side
connector
DIAGNOSIS PROCEDURE
NOTE: . AK301358AB
*1: L.H. drive vehicles • Remove relay, and measure at junction block
*2: R.H. drive vehicles side.
• Resistance between terminal No. 4 and earth.
OK: 2 Ω or less
Q: Is the check result normal?
YES : Go to Step 4 .
NO : Check intermediate connector C-212, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between C-222 (terminal No. 4)
fuel pump relay (1) connector and body
earth.
• Check earthing line for open circuit
and damage.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-321
STEP 4. Perform voltage measurement at C-222 STEP 5. Connector check: C-201 ignition switch
fuel pump relay (1) connector. connector
Connector: C-222 Connector: C-201
Junction block’s <L. H. drive vehicles>
C-222 triangle marks

2 1
4 3 C-201
Harness side
connector

AK301358AB

• Remove relay, and measure at junction block

side.
<R. H. drive vehicles>
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
Q: Is the check result normal? C-201
YES : Go to Step 6 .
NO : Go to Step 5 .

3 2 1
6 5 4
Harness side connector
AK301346 AB

Connector: C-222
Junction block’s
C-222 triangle marks

2 1
4 3
Harness side
connector

AK301358AB

Q: Is the check result normal?

YES : Check intermediate connector C-210, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between C-222 (terminal No. 1)
fuel pump relay (1) connector and C-201
(terminal No. 2) ignition switch connector.
• Check power supply line for open
circuit and damage.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-322 TROUBLESHOOTING

STEP 6. Perform voltage measurement at C-222 STEP 7. Perform voltage measurement at C-220
fuel pump relay (1) connector. fuel pump relay (2) connector.
Connector: C-222 Connector: C-220
Junction block’s
Junction block’s triangle marks
C-222 triangle marks

C-220
2 1
2 1
4 3
4 3
Harness side
Harness side connector
connector

AK301358AB AK301359 AB

• Remove relay, and measure at junction block

Connector: C-201
side.
<L. H. drive vehicles>
• Voltage between terminal No. 2 and earth.
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 7 . C-201
NO : Check intermediate connectors C-27*1,
C-115*2, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between C-222 (terminal
No. 2) fuel pump relay (1) connector and
battery.
<R. H. drive vehicles>
• Check power supply line for
open/short circuit.

C-201

3 2 1
6 5 4
Harness side connector
AK301346 AB

• Remove relay, and measure at junction block

side.
• Ignition switch: ON
• Voltage between terminal No. 1 and earth.
OK: System voltage
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-323
Q: Is the check result normal?
STEP 8. Connector check: C-123 engine-ECU
YES : Go to Step 8 .
NO : Check intermediate connector C-210, and
<M/T> connector or C-122 engine-A/T-ECU <A/T>
repair if necessary. If intermediate connector
connector is normal, check and repair Connector: C-123
harness between C-201 (terminal No. 2) <L. H. drive vehicles>
ignition switch connector and C-220
(terminal No. 1) fuel pump relay (2)
connector.
• Check power supply line for
open/short circuit. C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

Q: Is the check result normal?

YES : Go to Step 9 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-324 TROUBLESHOOTING

STEP 9. Perform voltage measurement at C-123 Connector: C-220

engine-ECU <M/T> connector or C-122 Junction block’s
triangle marks
engine-A/T-ECU <A/T> connector.
Connector: C-123 C-220
2 1
<L. H. drive vehicles>
4 3
Harness side
connector

C-123 (Y) AK301359 AB

• Disconnect connector, and measure at harness

<R. H. drive vehicles> side.
• Ignition switch: ON
• Voltage between terminal No. 22 <M/T> or
terminal No. 21 <A/T> and earth.
OK: System voltage
Q: Is the check result normal?
C-123 (Y) YES : Go to Step 10 .
NO : Check intermediate connectors C-14*1,
13 12 11 10 9 8 7 6 5 4 3 2 1 C-136*2 and C-212, and repair if necessary.
26 25 24 23 22 21 20 19 18 17 16 15 14 If intermediate connectors are normal,
Harness side connector check and repair harness between C-220
AK301122 AB
(terminal No. 4) fuel pump relay (2)
Connector: C-122 connector and C-123 (terminal No. 22)
<L. H. drive vehicles> engine-ECU <M/T> or C-122 (terminal No.
21) engine-A/T-ECU <A/T> connector.
• Check earthing line for open/short
circuit.

C-122 (GR)
STEP 10. Connector check: D-16 fuel pump
connector
<R. H. drive vehicles>
Connector: D-16 High-pressure fuel
hose

D-16 (GR)

C-122 (GR)
3 2 1
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78 5 4 Fuel tank hose
100 99 98 97 96 95 94 93 92 91 Harness side connector AK301360 AB
Harness side connector
AK301123 AB
Q: Is the check result normal?
YES : Go to Step 11 .
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-325
STEP 11. Perform voltage measurement at D-16 STEP 12. Check harness between C-220 (terminal
fuel pump connector. No. 2) fuel pump relay (2) connector and D-16
(terminal No. 5) fuel pump connector.
Connector: D-16 High-pressure fuel
hose Connector: C-220
Junction block’s
triangle marks

D-16 (GR)
C-220
2 1
4 3
3 2 1 Harness side
5 4 connector
Fuel tank hose
Harness side connector AK301360 AB

• Disconnect connector, and measure at harness AK301359 AB

side.
Connector: D-16 High-pressure fuel
• Ignition switch: ON
hose
• Using a jumper wire, connect C-123 (terminal No.
22) engine-ECU <M/T> connector or C-122
(terminal No. 21) engine-A/T-ECU <A/T> D-16 (GR)
connector and earth.
• Voltage between terminal No. 5 and earth.
OK: System voltage 3 2 1
5 4 Fuel tank hose
Q: Is the check result normal?
Harness side connector
YES : Go to Step 14 . AK301360 AB

NO : Go to Step 12 .
NOTE: Before checking harness, check intermediate
connectors C-215*1, C-212*2 and C-120*2 and D-18,
and repair if necessary.
• Check output line for open/short circuit and
damage.
Q: Is the check result normal?
YES : Go to Step 13 .
NO : Repair.

STEP 13. Check harness between C-222 (terminal

No. 3) fuel pump relay (1) connector and C-220
(terminal No. 3) fuel pump relay (2) connector.
Connector: D-16 High-pressure fuel
hose

D-16 (GR)

3 2 1
5 4 Fuel tank hose
Harness side connector AK301360 AB

• Check power supply line for open/short circuit.

Q: Is the check result normal?
YES : Go to Step 14 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-326 TROUBLESHOOTING

STEP 14. Check harness between C-201 (terminal STEP 15. Check harness between C-201 (terminal
No. 2) ignition switch connector and C-222 No. 2) ignition switch connector and C-220
(terminal No. 1) fuel pump relay (1) connector. (terminal No. 1) fuel pump relay (2) connector.
Connector: C-201 Connector: C-201
<L. H. drive vehicles> <L. H. drive vehicles>

C-201 C-201

<R. H. drive vehicles> <R. H. drive vehicles>

C-201 C-201

3 2 1 3 2 1
6 5 4 6 5 4
Harness side connector Harness side connector
AK301346 AB AK301346 AB

Connector: C-222 Connector: C-220

Junction block’s
Junction block’s triangle marks
C-222 triangle marks

C-220
2 1
2 1
4 3
4 3
Harness side
Harness side connector
connector

AK301358AB AK301359 AB

NOTE: Before checking harness,check intermediate • Check power supply line for damage.
connector C-210, and repair if necessary. Q: Is the check result normal?
• Check power supply line for damage. YES : Go to Step 16 .
Q: Is the check result normal? NO : Repair.
YES : Go to Step 15 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-327
STEP 16. Check harness between C-220 (terminal Connector: C-122
No.4) fuel pump relay (2) connector and C-123 <L. H. drive vehicles>
(terminal No.22) engine-ECU <M/T> connector or
C-122 (terminal No.21) engine-A/T-ECU <A/T>
connector.
Connector: C-220
Junction block’s C-122 (GR)
triangle marks

<R. H. drive vehicles>

C-220
2 1
4 3
Harness side
connector

AK301359 AB C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

NOTE: Before checking harness, check intermediate

C-123 (Y) connectors C-14*1 , C-136*2 and C-212, and repair if
necessary.
• Check earthing line for damage.
<R. H. drive vehicles>
Q: Is the check result normal?
YES : Go to Step 22 .
NO : Repair.

STEP 17. Perform resistance measurement at

C-123 (Y) D-16 fuel pump connector.
Connector: D-16 High-pressure fuel
13 12 11 10 9 8 7 6 5 4 3 2 1 hose
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
D-16 (GR)

3 2 1
5 4 Fuel tank hose
Harness side connector AK301360 AB

• Disconnect connector, and measure at harness

side.
• Resistance between terminal No.4 and earth.
OK : 2Ω or less
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-328 TROUBLESHOOTING

Q: Is the check result normal?

STEP 20. Check harness between C-220 (terminal
YES : Go to Step 18 .
NO : Check intermediate connector D-18, and
No.2) fuel pump relay (2) connector and D-16
repair if necessary. If intermediate (terminal No.5) fuel pump connector.
connector D-16 (terminal No.4) fuel pump Connector: C-220
connector and body earth. Junction block’s
triangle marks
• Check earthing line for open circuit
and damage. C-220
2 1
4 3
STEP 18. Check harness between battery and Harness side
C-222 (terminal No.2) fuel pump relay (1) connector
connector.
Connector: C-222 AK301359 AB

Junction block’s
C-222 triangle marks Connector: D-16 High-pressure fuel
hose
2 1
4 3
D-16 (GR)
Harness side
connector

AK301358AB 3 2 1
5 4 Fuel tank hose
NOTE: Before checking harness, check intermediate Harness side connector AK301360 AB
connectors C-27*1 , C-115*2 and C-209, and repair if
necessary. NOTE: Before checking harness, check intermediate
• Check power supply line for damage. connectors C-215*1 , C-212*2 and C-120*2 and
D-18, and repair if necessary.
Q: Is the check result normal?
• Check output line for damage.
YES : Go to Step 19 .
NO : Repair. Q: Is the check result normal?
YES : Go to Stop 21 .
NO : Repair.
STEP 19. Check harness between C-222 (terminal
No.3) fuel pump relay (1) connector and C-220
(terminal No.3) fuel pump relay (2) connector. STEP 21. Check fuel pump itself.
• Check fuel pump itself (Refer to P.13A-387).
Connector: C-220, C-222
Q: Is the check result normal?
C-222 Junction block’s YES : Go to Stop 22 .
triangle marks NO : Replace fuel pump.
C-220

2 1 STEP 22. MUT-II/III actuator test

4 3 • Refer to actuator test reference table P.13A-367.
Harness side
connector Q: Is the check result normal?
YES : Intermittent malfunction (Refer to GROUP
AK301357AB
00 − How to Use Troubleshooting/Inspection
• Check power supply line for damage. Service Points P.00-6).
Q: Is the check result normal? NO : Replace engine-ECU<M/T> or
YES : Go to Step 20 . engine-A/T-ECU<A/T>.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-329

Inspection Procedure 25: Fan Control Relay System

Fan control relay circuit

Battery

W W

8
20 A

B-Y 7 <A-13> (*1) or

11 <C-111> (*2)

B-Y
B-Y

1 2
B-16X

1 2
Engine control relay
3 4 OFF ON

4 3
R-Y
28 To engine-ECU <M/T> or engine-A/T-ECU <A/T>
Fusible link (2) J/C (6)
C-12 (*1) or
C-134 (*2)
33
Engine control system R-Y
B-W 8 <A-13> (*1) or
10 <C-111> (*2)

R-Y
4 1
A-09X
2
1 3 Fan control relay
4 OFF ON

2 3
B
L

3
A-18
(MU802322)

1 2 3 Smoothing Fan controller

circuit

NOTE
*1: L.H. drive vehicles
*2: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301364 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-330 TROUBLESHOOTING

OPERATION STEP 2. Check fan control relay.

• The battery voltage is applied to the fan control • Check fan control relay (Refer to GROUP 14 −
relay (terminal No. 1) from the engine control On−vehicle Service P.14-24).
relay (terminal No. 4) and is earthed to the
vehicle body from the fan control relay (terminal Q: Is the check result normal?
No. 3). YES : Go to Step 3 .
• The battery voltage is applied to the fan control NO : Replace fan control relay.
relay (terminal No. 4).
• When the fan control relay is in "ON" position, the STEP 3. Perform resistance measurement at
battery voltage is supplied to the fan controller A-09X fan control relay connector.
(terminal No. 3) from the fan control relay
Connector: A-09X
(terminal No. 2).

FUNCTION
• When the engine control relay is in "ON" position,
the fan control relay is also simultaneously
placed in "ON" position. Accordingly, the battery A-09X
voltage is supplied to the fan controller.
2
3 1
PROBABLE CAUSE 4
• Failed fan control relay Harness side connector AK301365 AB

• Failed fan controller • Remove relay and measure at relay box side.
• Failed radiator fan motor • Resistance between terminal No. 3 and earth.
• Failed condenser fan motor
OK: 2 Ω or less
• Open/short circuit in fan control relay circuit or
loose connector contact Q: Is the check result normal?
• Failed engine-ECU <M/T> YES : Go to Step 4 .
• Failed engine-A/T-ECU <A/T> NO : Check and repair harness between A-09X
(terminal No. 3) fan control relay connector
DIAGNOSIS PROCEDURE and body earth.
• Check earthing line for open circuit
NOTE: . and damage.
*1: L.H. drive vehicles
*2: R.H. drive vehicles
STEP 4. Perform voltage measurement at A-09X
fan control relay connector.
STEP 1. Connector check: A-09X fan control
relay connector Connector: A-09X

Connector: A-09X

A-09X

A-09X 2
3 1
2 4
3 1 Harness side connector AK301365 AB
4
Harness side connector AK301365 AB • Remove relay and measure at relay box side.
• Ignition switch: ON
Q: Is the check result normal? • Voltage between terminal No. 1 and earth.
YES : Go to Step 2 . OK: System voltage
NO : Repair or replace.
Q: Is the check result normal?
YES : Go to Step 6 .
NO : Go to Step 5 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-331
STEP 5. Connector check: B-16X engine control STEP 6. Perform voltage measurement at A-09X
relay connector fan control relay connector.
Connector: B-16X Connector: A-09X
B-16X
Relay box’s
triangle marks

2 1 A-09X

4 3 2
3 1
Harness side 4
connector AK301121 AB Harness side connector AK301365 AB

• Remove relay, and measure at relay box side.

Connector: A-09X
• Voltage between terminal No. 4 and earth
OK: System voltage
Q: Is the check result normal?
YES : Go to Step 7 .
A-09X NO : Check and repair harness between battery
and A-09X (terminal No. 4) fan control relay
2
3 1 connector.
4 • Check power supply line for
Harness side connector AK301365 AB open/short circuit.
Q: Is the check result normal?
YES : Check intermediate connectors A-13*1, STEP 7. Connector check: A-18 fan controller
*2 *1 *2
C-111 and C-12 , C-134 , and repair if connector
necessary. If intermediate connectors are Connector: A-18
normal, check and repair harness between 3 2 1
B-16X (terminal No. 4) engine control relay Harness side
connector
connector and A-09X (terminal No. 1) fan
control relay connector.
• Check power supply line for
open/short circuit.
NO : Repair or replace.
A-18 (GR)
AK301354 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-332 TROUBLESHOOTING

STEP 8. Perform voltage measurement at A-18 STEP 10. Connector check: B-16X engine control
fan controller connector. relay connector
Connector: A-18 Connector: B-16X
3 2 1 B-16X
Harness side Relay box’s
connector triangle marks

2 1
4 3
A-18 (GR) Harness side
AK301354 AB connector AK301121 AB

• Disconnect connector, and measure at harness Q: Is the check result normal?

side. YES : Go to Step 11 .
• Ignition switch: ON NO : Repair or replace.
• Voltage between terminal No. 3 and earth.
OK: System voltage
STEP 11. Check harness between B-16X (terminal
Q: Is the check result normal? No. 4) engine control relay connector and A-09X
YES : Go to Step 12 . (terminal No. 1) fan control relay connector.
NO : Go to Step 9 .
Connector: B-16X
B-16X
STEP 9. Check harness between A-09X (terminal Relay box’s
No. 2) fan control relay connector and A-18 triangle marks
(terminal No. 3) fan controller connector.
Connector: A-09X 2 1
4 3
Harness side
connector AK301121 AB

A-09X Connector: A-09X

2
3 1
4
Harness side connector AK301365 AB

Connector: A-18 A-09X

3 2 1
Harness side 2
3 1
connector
4
Harness side connector AK301365 AB

NOTE: Before checking harness, check intermediate

connectors A-13*1, C-134*2 and C-12*1, C-134*2, and
repair if necessary.
A-18 (GR)
• Check power supply line for damage.
AK301354 AB

• Check output line for open/short circuit. Q: Is the check result normal?
YES : Check and repair harness between A-09X
Q: Is the check result normal? (terminal No. 3) fan control relay connector
YES : Go to Step 10 . and body earth.
NO : Repair. • Check earthing line for damage.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-333
STEP 12. Connector check: C-123 engine-ECU STEP 13. Fan motor drive test.
<M/T> or C-122 engine-A/T-ECU <A/T> connector Connector: C-123
Connector: C-123 <L. H. drive vehicles>
<L. H. drive vehicles>

C-123 (Y)
C-123 (Y)

<R. H. drive vehicles>

<R. H. drive vehicles>

C-123 (Y)
C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
13 12 11 10 9 8 7 6 5 4 3 2 1 26 25 24 23 22 21 20 19 18 17 16 15 14
26 25 24 23 22 21 20 19 18 17 16 15 14 Harness side connector
AK301122 AB
Harness side connector
AK301122 AB
Connector: C-122
Connector: C-122 <L. H. drive vehicles>
<L. H. drive vehicles>

C-122 (GR)
C-122 (GR)

<R. H. drive vehicles>

<R. H. drive vehicles>

C-122 (GR)
C-122 (GR)
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
77 76 75 74 73 72 71
100 99 98 97 96 95 94 93 92 91
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 Harness side connector
AK301123 AB
Harness side connector
AK301123 AB
• Disconnect C-123 engine-ECU <M/T> or C-122
Q: Is the check result normal?
engine-A/T-ECU <A/T> connector.
YES : Go to Step 13 . • Ignition switch: ON
NO : Repair or replace. OK: Fan motor rotates.
Q: Is the check result normal?
YES : Go to Step 14 .
NO : Go to Step 15 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-334 TROUBLESHOOTING

STEP 14. MUT-II/III actuator test STEP 15. Perform voltage measurement at C-123
• Refer to actuator test reference table P.13A-367. engine-ECU <M/T> connector or C-122
a. Item 21: Fan controller engine-A/T-ECU <A/T> connector.
OK: Fan motor rotates. Connector: C-123
Q: Is the check result normal? <L. H. drive vehicles>
YES : Intermittent malfunction (Refer to GROUP
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6).
NO : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>. C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Voltage between terminal No. 21 <M/T> or
terminal No. 18 <A/T> and earth.
OK: 4.9 − 5.1 V
Q: Is the check result normal?
YES : Go to Step 16 .
NO : Go to Step 18 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-335
STEP 16. Check harness between A-09X STEP 17. Check harness between A-09X
(terminal No. 4) fan control relay connector and (terminal No. 2) fan control relay connector and
battery. A-18 (terminal No. 3) fan controller connector.
Connector: A-09X Connector: A-09X

A-09X A-09X
2 2
3 1 3 1
4 4
Harness side connector AK301365 AB Harness side connector AK301365 AB

• Check power supply line for damage. Connector: A-18

Q: Is the check result normal? 3 2 1
YES : Go to Step 17 . Harness side
connector
NO : Repair.

A-18 (GR)
AK301354 AB

• Check output line for damage.

Q: Is the check result normal?
YES : Replace fan motor and fan controller.
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-336 TROUBLESHOOTING

STEP 18. Check harness between A-18 (terminal Connector: C-122

No. 2) fan controller connector and C-123 <L. H. drive vehicles>
(terminal No. 21) engine-ECU <M/T> connector or
C-122 (terminal No. 18) engine-A/T-ECU <A/T>
connector.
Connector: A-18
3 2 1 C-122 (GR)
Harness side
connector
<R. H. drive vehicles>

A-18 (GR)
AK301354 AB C-122 (GR)

Connector: C-123 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
<L. H. drive vehicles> 100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

NOTE: Before checking harness, check intermediate

C-123 (Y) connector A-13*1, A-111*2, and repair if necessary.
• Check output line for short circuit.
<R. H. drive vehicles> Q: Is the check result normal?
YES : Replace fan motor and fan controller.
NO : Repair.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-337

Inspection Procedure 26: A/C System

A/C Circuit

A/C-ECU A/C Compressor relay

B-R P

45 (*1) or 8 (*1) or
83 (*2) 20 (*2)
C-125 (*1) C-123 (*1)
(MU801822) (MU801824)

31 32 33 34 35 36 37 38 1 2 3 4 5 6 7 8 9 10 11 12 13
39 40 41 42 43 44 45 46 14 15 16 17 18 19 20 21 22 23 24 25 26

C-126 (*2) C-122 (*2)

(MU803782) Engine-ECU <M/T> (MU803784)
or
71 72 73 74 75 76 77 Engine-A/T-ECU <A/T> 1 2 3 4 5 6 7 8
78 79 80 81 82 83 84 85 86 87 88 89 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
90 91 92 93 94 95 96 97 98 24 25 26 27 28 29 30 31 32 33 34 35

NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301366 AB

OPERATION • When the A/C switch "ON" signal is inputted to

• The battery voltage is applied to the engine-ECU the engine-ECU <M/T> or engine-A/T-ECU
(terminal No. 45) <M/T> or engine-A/T-ECU <A/T>, the ehgjne-ECU <M/T> or
(terminal No. 83) <A/T> from the A/C-ECU. engine-A/T-ECU <A/T> places the A/C
• The engine-ECU (terminal No. 8) <M/T> or compressor relay in the "ON" position.
engine-A/T-ECU (terminal No. 20) <A/T> makes Accordingly, the battery voltage supplied to the
the power transistor in the unit be in "ON" A/C compressor operates the magnet clutch.
position and makes currents go on the A/C
compressor relay coil, and that makes the relay PROBABLE CAUSE
be in "ON" position. • Failed A/C
• Failed A/C system
FUNCTION • Open/short circuit in A/C circuit or loose
• When the A/C switch is in "ON" position, A/C connector contact
switch ON signal is inputted to the engine-ECU • Failed engine-ECU <M/T>
<M/T> or engine-A/T-ECU <A/T> from the • Failed engine-A/T-ECU <A/T>
A/C-ECU. In response to the signal, the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
controls the A/C compressor relay.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-338 TROUBLESHOOTING

DIAGNOSIS PROCEDURE Connector: C-122, C-126

<L. H. drive vehicles>
STEP 1. Connector check: C-123 and C-125
engine-ECU <M/T> connector or C-122 and C-126
engine-A/T-ECU <A/T> connector
Connector: C-123, C-125 C-126 (GR) C-122 (GR)
<L. H. drive vehicles>

<R. H. drive vehicles>

C-125 (Y) C-123 (Y)

<R. H. drive vehicles> C-122 (GR) C-126 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
C-122: Harness side connector

C-123 (Y) C-125 (Y) 77 76 75 74 73 72 71

89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
C-126: Harness side connector
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14 AK301368 AB
C-123: Harness side connector
Q: Is the check result normal?
38 37 36 35 34 33 32 31
YES : Go to Step 2 .
46 45 44 43 42 41 40 39 NO : Repair or replace.
C-125: Harness side connector
AK301367 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-339
STEP 2. Perform voltage measurement at C-123 • Using a jamper wire, connect terminal No. 8
engine-ECU <M/T> connector or C-122 <M/T> or terminal No. 20 <A/T>.
engine-A/T-ECU <A/T> connector. OK: A/C compressor relay should turn "ON"
Connector: C-123 Q: Is the check result normal?
<L. H. drive vehicles> YES : Go to Step 3 .
NO : Check Air conditioner (Refer to GROUP 55
− Troubleshooting P.55-4).

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB

Connector: C-122
<L. H. drive vehicles>

C-122 (GR)

<R. H. drive vehicles>

C-122 (GR)

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK301123 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Voltage between terminal No. 8 <M/T> or
terminal No. 20 <A/T> and earth.
OK: System voltage
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-340 TROUBLESHOOTING

Q: Is the check result normal?

STEP 3. Perform voltage measurement at C-125
YES : Replace the engine-ECU <M/T> or
engine-ECU <M/T> connector or C-126
engine-A/T-ECU <A/T>.
engine-A/T-ECU <A/T> connector. NO : Check Air conditioner (Refer to GROUP 55
Connector: C-125 − Troubleshooting P.55-4).
<L. H. drive vehicles>

C-125 (Y)

<R. H. drive vehicles>

C-125 (Y)

38 37 36 35 34 33 32 31
46 45 44 43 42 41 40 39
Harness side connector
AK301135 AB

Connector: C-126
<L. H. drive vehicles>

C-126 (GR)

<R. H. drive vehicles>

C-126 (GR)

77 76 75 74 73 72 71
89 88 87 86 85 84 83 82 81 80 79 78
98 97 96 95 94 93 92 91 90
Harness side connector
AK301118 AB

• Disconnect connector, and measure at harness

side.
• Ignition switch: ON
• Voltage between terminal No. 45 <M/T> or
terminal No. 83 <A/T> and earth.
OK:
System voltage (when the A/C is ON)
0.5 V or less (when the A/C is OFF)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-341

Inspection Procedure 27: A/C Load Signal System

A/C load signal circuit

C-139
(MU801584)

1 2 3 4 5 6 7 8 A/C-ECU
9 10 11 12 13 14 15 16

5 (*3) or
2 (*4)
G-Y

C-15 (*3)
4

G-Y
24 (*1) or
61 (*2)
C-124 (*2) C-123 (*1)
(MU803781) (MU801824)
41 42 43 44 45 46
47 48 49 50 51 52 53 54 55 56 57 1 2 3 4 5 6 7 8 9 10 11 12 13
58 59 60 61 62 63 64 65 66 14 15 16 17 18 19 20 21 22 23 24 25 26

Engine-ECU <M/T>
or
Engine-A/T-ECU <A/T>

NOTE
*1: M/T
*2: A/T
*3: L.H. drive vehicles
*4: R.H. drive vehicles
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet

AK301369 AB

OPERATION PROBABLE CAUSE

• The A/C load signal is inputted to the • Failed A/C-ECU
engine-ECU (terminal No. 24) from the A/C-ECU • Open/short circuit in A/C load signal circuit or
(terminal No. 5) <L.H. drive vehicles> or (terminal loose connector contact
No. 2) <R.H. drive vehicles>. • Failed engine-ECU <M/T> or engine-A/T-ECU
<A/T>
FUNCTION
• The magnitude of the A/C compressor load is DIAGNOSIS PROCEDURE
detected and input to the engine-ECU <M/T> or
engine-A/T-ECU <A/T>. The engine-ECU <M/T> NOTE: .
or engine-A/T-ECU <A/T> provides A/C idle up *1: L.H. drive vehicles
control according to the A/C compressor load *2: R.H. drive vehicles
condition.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-342 TROUBLESHOOTING

Q: Is the check result normal?

STEP 1. Perform voltage measurement at C-123
YES : Go to Step 2 .
engine-ECU <M/T> connector or C-124 NO : Go to Step 4 .
engine-A/T-ECU <A/T> connector.
Connector: C-123
STEP 2. Connector check: C-123 engine-ECU
<L. H. drive vehicles>
<M/T> connector or C-124 engine-A/T-ECU <A/T>
connector
Connector: C-123
<L. H. drive vehicles>
C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

<R. H. drive vehicles>

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
C-123 (Y)
Harness side connector
AK301122 AB

Connector: C-124 13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
<L. H. drive vehicles>
Harness side connector
AK301122 AB

Connector: C-124
<L. H. drive vehicles>
C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

<R. H. drive vehicles>

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector C-124 (GR)

AK301112 AB
• Measure engine-ECU <M/T> or engine-A/T-ECU 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
<A/T> terminal voltage. 66 65 64 63 62 61 60 59 58
• Engine: Idling
Harness side connector
• A/C switch: ON (A/C compressor in driven state) AK301112 AB
• Voltage between terminal No. 24 <M/T> or
terminal No. 66 <A/T> and earth Q: Is the check result normal?
YES : Go to Step 3 .
OK: NO : Repair or replace.
1 V or less (when the A/C is under high load)
System voltage (when the A/C is under high
load)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-343
Q: Is the check result normal?
STEP 3. Check the trouble symptoms.
YES : Go to Step 5 .
Q: Does trouble symptom persist? NO : . Repair or replace.
YES : Replace engine-ECU <M/T> or
engine-A/T-ECU <A/T>.
STEP 5. Perform voltage measurement at C-139
NO : Intermittent malfunction (Refer to GROUP
A/C-ECU connector.
00 − How to Use Troubleshooting/Inspection
Service Points P.00-6). Connector: C-139

STEP 4. Connector check: C-123 engine-ECU

<M/T> or C-124 engine-A/T-ECU <A/T> connector
Connector: C-123 C-139 (B)
<L. H. drive vehicles>
8 7 6 5 4 3 2 1
16 15 14 13 12 11 10 9
Harness side connector AK301370 AB

C-123 (Y) • Measure A/C-ECU terminal voltage.

• Engine: Idling
• A/C switch: ON (A/C compressor in drive state)
<R. H. drive vehicles>
• Voltage between terminal No. 5*1 orNo. 2*2 and
earth
OK: System voltage (when the A/C is under
high load)
Q: Is the check result normal?
C-123 (Y) YES : Go to Step 8 .
NO : Go to Step 6 .
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14 STEP 6. Connector Check: C-139 A/C-ECU
Harness side connector connector
AK301122 AB

Connector: C-139
Connector: C-124
<L. H. drive vehicles>

C-139 (B)

C-124 (GR)
8 7 6 5 4 3 2 1
16 15 14 13 12 11 10 9

<R. H. drive vehicles> Harness side connector AK301370 AB

Q: Is the check result normal?

YES : Go to Step 7 .
NO : Repair or replace.

C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-344 TROUBLESHOOTING

STEP 7. Check harness between C-139 (terminal Connector: C-124

No. 5*1 or No. 4*2) and C-123 (terminal No. 24) <L. H. drive vehicles>
engine-ECU <M/T> connector or C-124 (terminal
No. 61) engine-A/T-ECU <A/T> connector.
Connector: C-139
C-124 (GR)

<R. H. drive vehicles>

C-139 (B)

8 7 6 5 4 3 2 1
16 15 14 13 12 11 10 9
Harness side connector AK301370 AB

C-124 (GR)
Connector: C-123
<L. H. drive vehicles> 46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

AK301112 AB

NOTE: Before checking harness, check intermediate

C-123 (Y)
connector C-15*1, and repair if necessary.
• Check output line for short circuit.
<R. H. drive vehicles>
Q: Is the check result normal?
YES : Check Air conditioner (Refer to GROUP 55
− Troubleshooting P.55-4).
NO : Repair.

C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-345
STEP 8. Check connector: C-139 A/C-ECU Connector: C-124
connector <L. H. drive vehicles>

Connector: C-139

C-124 (GR)

C-139 (B)
<R. H. drive vehicles>
8 7 6 5 4 3 2 1
16 15 14 13 12 11 10 9
Harness side connector AK301370 AB

Connector: C-123
<L. H. drive vehicles>
C-124 (GR)

46 45 44 43 42 41
57 56 55 54 53 52 51 50 49 48 47
66 65 64 63 62 61 60 59 58

Harness side connector

C-123 (Y) AK301112 AB

Q: Is the check result normal?

<R. H. drive vehicles> YES : Check intermediate connector C-15*1, and
repair if necessary. If intermediate
connector is normal, check and repair
harness between C-139 (terminal No. 5*1 or
No. 2*2) and C-123 (terminal No. 24)
C-123 (Y) engine-ECU <M/T> connector or C-124
(terminal No. 61) engine-A/T-ECU <A/T>
connector.
13 12 11 10 9 8 7 6 5 4 3 2 1 • Check output line for open circuit.
26 25 24 23 22 21 20 19 18 17 16 15 14
NO : Repair or replace.
Harness side connector
AK301122 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-346 TROUBLESHOOTING

Inspection Procedure 28: Ignition Circuit System <L. H. drive vehicles>

Ignition circuit

Ignition switch
C-201

R LOCK
1 2 3
ST ACC
4 5 6 IG1 IG2

2
B-W C-210
6

1
J/B
10 A

10
C-212
B-Y
C-27
18

6
W A-13
W

1 1
Ignition coil 1 Ignition coil 2
B-104 B-113

1 2 3 1 2 3

3 2 Spark 2 3
plug

B B
B-Y B-G

B
10 (*1) or 23 (*1) or
11 (*2) 12 (*2)

C-123 (*1)
(MU801824)
Engine-ECU <M/T>
or 1 2 3 4 5 6 7 8 9 10 11 12 13
Engine-A/T-ECU <A/T> 14 15 16 17 18 19 20 21 22 23 24 25 26

C-122 (*2)
(MU803784)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 3132 33 34 35
NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301371 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-347
OPERATION STEP 3. Connector check: B-104 and B-113
• The battery voltage is applied to the ignition coil ignition coil connectors.
(terminal No. 1) from the ignition switch and is
earthed to the vehicle body from the ignition coil Connector: B-104, B-113
3 2 1
(terminal No. 2).
Harness side
• A power voltage of 12 V is applied to the ignition connector
coil output terminal (terminal No. 3) from the
engine-ECU (terminal No. 10 and No. 23) <M/T>
or engine-A/T-ECU (terminal No. 11 or No. 12)
<A/T>.
B-104 (GR)
FUNCTION B-113 (GR)
• When the engine-ECU <M/T> or engine-A/T-ECU AK301352 AB
<A/T> makes the power transistor in the unit be
in "OFF" position, the battery voltage in the unit is Q: Is the check result normal?
applied to the power transistor unit, and that YES : Go to Step 4 .
makes the power transistor unit be in "ON" NO : Repair or replace.
position. The engine-ECU <M/T> or
engine-A/T-ECU <A/T> makes the power STEP 4. Check ignition coil itself.
transistor in the unit be in "ON", and that makes • Check ignition coil itself (Refer to GROUP 16 −
the power transistor unit be in "OFF" position. Ignition System − On-vehicle Service P.16-32).
• In response to the signal from the engine-ECU
Q: Is the check result normal?
<M/T> or engine-A/T-ECU <A/T>, the power YES : Go to Step 5 .
transistor unit is in "ON" position. The primary NO : Replace ignition coil.
current is going to the ignition coil. When the
power transistor unit is in "OFF" position, the
primary current is interrupted and high voltage is STEP 5. Perform voltage measurement at B-104
generated in the secondary coil. and B-113 ignition coil connectors.
Connector: B-104, B-113
PROBABLE CAUSE 3 2 1
• Failed ignition coil Harness side
• Failed spark plug connector
• Failed resistive cord
• Open/short circuit in ignition primary circuit or
loose connector contact
• Failed engine-ECU <M/T> B-104 (GR)
• Failed engine-A/T-ECU <A/T> B-113 (GR)
AK301352 AB
DIAGNOSIS PROCEDURE
• Disconnect connector, and measure at harness
side.
STEP 1. Check resistive cord itself. • Ignition switch: ON
• Check resistive cord itself (Refer to GROUP 16 − • Voltage between terminal No. 1 and earth.
Ignition System − On-vehicle Service P.16-32). OK: System voltage
Q: Is the check result normal? Q: Is the check result normal?
YES : Go to Step 2 . YES : Go to Step 7 .
NO : Replace resistive cord. NO : Go to Step 6 .

STEP 2. Check spark plug.

Q: Is the check result normal?
YES : Go to Step 3 .
NO : Replace spark plug.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-348 TROUBLESHOOTING

STEP 6. Connector check: C-201 ignition switch STEP 7. Perform voltage measurement at B-104
connector and B-113 ignition coil connectors.
CONNECTOR: C-201 Connector: B-104, B-113
3 2 1
Harness side
connector

C-201

B-104 (GR)
3 2 1
B-113 (GR)
6 5 4
Harness side connector AK302350 AB AK301352 AB

• Disconnect connector, and measure at harness

Connector: B-104, B-113 side.
3 2 1
Harness side • Engine: Cranking
connector • Voltage between terminal No. 3 and earth.
OK: 0.5 − 4.0 V
Q: Is the check result normal?
YES : Go to Step 13 .
B-104 (GR) NO : Go to Step 8 .
B-113 (GR)
AK301352 AB

Q: Is the check result normal?

YES : Check intermediate connectors A-13, C-27,
C-212 and C-210, and repair if necessary. If
intermediate connectors are normal, check
and repair harness between C-201 (terminal
No. 2) ignition switch connector and B-113
(terminal No. 1) ignition coil connector, also
between C-201 (terminal No. 2) ignition
switch connector and B-104 (terminal No. 1)
ignition coil connector.
• Check power supply line for
open/short circuit.
NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-349
STEP 8. Perform voltage measurement at C-123 STEP 9. Connector check: C-123 engine-ECU
engine-ECU <M/T> connector or C-122 <M/T> connector or C-122 engine-A/T-ECU <A/T>
engine-A/T-ECU <A/T> connector. connector
CONNECTOR: C-123 CONNECTOR: C-123

C-123 (Y) C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1 13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14 26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector Harness side connector
AK302352 AB AK302352 AB

Connector: C-122 Connector: C-122

C-122 (GR) C-122 (GR)

77 76 75 74 73 72 71 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 100 99 98 97 96 95 94 93 92 91
Harness side connector Harness side connector
AK302358 AB AK302358 AB

Connector: B-104, B-113 Connector: B-104, B-113

3 2 1 3 2 1
Harness side Harness side
connector connector

B-104 (GR) B-104 (GR)

B-113 (GR) B-113 (GR)
AK301352 AB AK301352 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU Q: Is the check result normal?

<A/T> terminal voltage. YES : Check and repair harness between B-113
• Disconnect B-104 and B-113 ignition coil (terminal No. 3) ignition coil connector and
connectors. C-123 (terminal No. 23) engine-ECU <M/T>
• Engine: Cranking connector or C-122 (terminal No. 12)
• Voltage between terminal No. 10 <M/T> or engine-A/T-ECU <A/T> connector, also
terminal No. 11 <A/T> and earth, also between between B-104 (terminal No. 3) ignition coil
terminal No. 23 <M/T> or terminal No. 12 <A/T> connector and C-122 (terminal No. 10)
and earth. engine-ECU <M/T> connector or C-122
OK: 0.5 − 4.0 V (terminal No. 11) engine-A/T-ECU <A/T>
Q: Is the check result normal? connector.
YES : Go to Step 9 . • Check output line for open circuit.
NO : Go to Step 10 . NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-350 TROUBLESHOOTING

STEP 10. Connector check: C-123 engine-ECU STEP 11. Check harness between B-113 (terminal
<M/T> connector or C-122 engine-A/T-ECU <A/T> No. 3) ignition coil connector and C-123 (terminal
connector No. 23) engine-ECU <M/T> connector or C-122
CONNECTOR: C-123
(terminal No. 12) engine-A/T-ECU <A/T>
connector, also between B-104 (terminal No. 3)
ignition coil connector and C-123 (terminal No.
10) engine-ECU <M/T> connector or C-122
(terminal No. 11) engine-A/T-ECU <A/T>
connector.
C-123 (Y) CONNECTOR: C-123
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK302352 AB

Connector: C-122
C-123 (Y)
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK302352 AB

C-122 (GR) Connector: C-122

77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK302358 AB

Q: Is the check result normal?

YES : Go to Step 11 . C-122 (GR)
77 76 75 74 73 72 71
NO : Repair or replace. 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK302358 AB

Connector: B-104, B-113

3 2 1
Harness side
connector

B-104 (GR)
B-113 (GR)
AK301352 AB

• Check output line for short circuit.

Q: Is the check result normal?
YES : Go to Step 12 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-351
STEP 12. Check the trouble symptoms. STEP 14. Check harness between C-201 (terminal
Q: Does trouble symptom persist?
No. 2) ignition switch connector and B-104
YES : Replace engine-ECU <M/T> or (terminal No. 1) ignition coil connector, also
engine-A/T-ECU <A/T>. between C-201 (terminal No. 2) ignition switch
NO : Intermittent malfunction (Refer to GROUP connector and B-113 (terminal No. 1) ignition coil
00 − How to Use Troubleshooting/Inspection connector.
Service Points P.00-6). CONNECTOR: C-201

STEP 13. Perform resistance measurement at

B-104 and B-113 ignition coil connectors.
C-201
Connector: B-104, B-113
3 2 1
Harness side
connector 3 2 1
6 5 4
Harness side connector AK302350 AB

B-104 (GR) Connector: B-104, B-113

3 2 1
B-113 (GR) Harness side
connector
AK301352 AB

• Disconnect connector, and measure at harness

side.
• Resistance between terminal No. 2 and earth.
B-104 (GR)
OK: 2 Ω or less B-113 (GR)
Q: Is the check result normal? AK301352 AB
YES : Go to Step 14 .
NO : Check and repair harness between B-104 NOTE: Before checking harness, check intermediate
(terminal No. 2) ignition coil connector and connectors A-13, C-27, C-212 and C-210, and repair
body earth, also between B-113 (terminal if necessary.
No. 2) ignition coil connector and body • Check power supply line for damage.
earth. Q: Is the check result normal?
• Check earthing line for open circuit YES : Go to Step 15 .
and damage. NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-352 TROUBLESHOOTING

STEP 15. Check harness between B-113 (terminal

No. 3) ignition coil connector and C-123 (terminal
No. 23) engine-ECU <M/T> connector or C-122
(terminal No. 12) engine-A/T-ECU <A/T>
connector, also between B-104 (terminal No. 3)
ignition coil connector and C-123 (terminal No.
10) engine-ECU <M/T> connector or C-122
(terminal No. 11) engine-A/T-ECU <A/T>
connector.
Connector: B-104, B-113
3 2 1
Harness side
connector

B-104 (GR)
B-113 (GR)
AK301352 AB

CONNECTOR: C-123

C-123 (Y)
13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector
AK302352 AB

Connector: C-122

C-122 (GR)
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector
AK302358 AB

• Check output line for damage.

Q: Is the check result normal?
YES : Go to Step 12 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-353

Inspection Procedure 29: Ignition Circuit System <R.H. drive vehicles>

Ignition circuit

Ignition switch
C-201
R LOCK
Battery 1 2 3
ST ACC
4 5 6 IG1 IG2
W W
2
B-W C-210
6
8
Relay box
20 A
1
J/B
10 A
B-Y
11 C-111
10
C-212
B-R
Engine control
system B-Y 9
C-136
W
B-14X 1 2

1 2 Ignition coil
relay ON
3 4 OFF

4 3 B
W-R W-R
1 1
Ignition coil 1 Ignition coil 2
B-104 B-113

1 2 3 1 2 3

3 2 Spark 2 3
plug

B B
B-Y B-G

B
10 (*1) or 23 (*1) or
11 (*2) 12 (*2)

C-123 (*1)
(MU801824)
Engine-ECU <M/T>
or 1 2 3 4 5 6 7 8 9 10 11 12 13
Engine-A/T-ECU <A/T> 14 15 16 17 18 19 20 21 22 23 24 25 26

C-122 (*2)
(MU803784)
1 2 3 4 5 6 7 8
9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
24 25 26 27 28 29 30 3132 33 34 35
NOTE
*1: M/T
*2: A/T
Wire colour code
B: Black LG: Light green G: Green L: Blue W: White Y: Yellow SB: Sky blue BR: Brown O: Orange GR: Gray
R: Red P: Pink V: Violet
AK301372 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-354 TROUBLESHOOTING

OPERATION STEP 2. Check spark plug.

• The battery voltage is applied to the ignition coil
relay (terminal No. 2) from the ignition switch and Q: Is the check result normal?
is earthed to the vehicle body from the ignition YES : Go to Step 3 .
coil relay (terminal No. 3). NO : Replace spark plug.
• The battery voltage is applied to the ignition coil
relay (terminal No. 1) from the battery and is STEP 3. Connector check: B-104 and B-113
earthed to the vehicle body from the ignition coil ignition coil connectors
relay (terminal No. 2).
Connector: B-104, B-113
• A power voltage of 12 V is applied to the ignition 3 2 1
coil output terminal (terminal No. 3) from the Harness side
engine-ECU (terminal No. 10 and No. 23) or connector
engine-A/T-ECU (terminal No. 11 and No. 12).

FUNCTION
• When the engine-ECU <M/T> or engine-A/T-ECU B-104 (GR)
<A/T> makes the power transistor in the unit be
B-113 (GR)
in "OFF" position, the battery voltage in the unit is
applied to the power transistor unit, and that AK301352 AB

makes the power transistor unit be in "ON"

Q: Is the check result normal?
position. The engine-ECU <M/T> or YES : Go to Step 4 .
engine-A/T-ECU <A/T> makes the power NO : Repair or replace.
transistor in the unit be in "ON", and that makes
the power transistor unit be in "OFF" position.
• In response to the signal from the engine-ECU STEP 4. Check ignition coil itself.
<M/T> or engine-A/T-ECU <A/T>, the power • Check ignition coil itself (Refer to GROUP 16 −
transistor unit is in "ON" position. The primary Ignition System − On-vehicle Service P.16-32).
current is going to the ignition coil. When the Q: Is the check result normal?
power transistor unit is in "OFF" position, the YES : Go to Step 5 .
primary current is interrupted and high voltage is NO : Replace ignition coil.
generated in the secondary coil.

PROBABLE CAUSE STEP 5. Perform voltage measurement at B-104

• Failed ignition coil and B-113 ignition coil connectors.
• Failed ignition coil relay Connector: B-104, B-113
• Failed spark plug 3 2 1
• Failed resistive cord Harness side
connector
• Open/short circuit in ignition primary circuit or
loose connector contact
• Failed engine-ECU <M/T>
• Failed engine-A/T-ECU <A/T>
B-104 (GR)
DIAGNOSIS PROCEDURE B-113 (GR)
AK301352 AB

STEP 1. Check resistive cord itself. • Disconnect connector, and measure at harness
• Check resistive cord itself (Refer to GROUP 16 − side.
Ignition System − On-vehicle Service P.16-32). • Ignition switch: ON
• Voltage between terminal No. 1 and earth.
Q: Is the check result normal?
YES : Go to Step 2 . OK: System voltage
NO : Replace resistive cord. Q: Is the check result normal?
YES : Go to Step 12 .
NO : Go to Step 6 .
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-355
STEP 6. Connector check : B-14X ignition coil STEP 9. Connector check: C-201 ignition switch
relay connectors connector
Connector: B-14X CONNECTOR: C-201
3 2 1
6 5 4
Relay box’s B-14X Harness side connector
triangle marks
C-201

2 1
4 3
Harness side connector AK301373AB
AK302351AB

Q: Is the check result normal? Connector: B-104, B-113

YES : Go to Step 7 . 3 2 1
NO : Repair or replace. Harness side
connector

STEP 7. Check ignition coil relay.

• Check ignition coil relay (Refer to GROUP 16 −
Ignition System − On-vehicle Service P.16-37).
B-104 (GR)
Q: Is the check result normal? B-113 (GR)
YES : Go to Step 8 .
AK301352 AB
NO : Replace ignition coil relay.
Q: Is the check result normal?
STEP 8. Perform voltage measurement at B-14X YES : Check intermediate connectors C-136,
ignition coil relay connector. C-210 and C-212, and repair if necessary. If
intermediate connectors are normal, check
Connector: B-14X
and repair harness between C-201 (terminal
No. 2) ignition switch connector and B-14X
Relay box’s B-14X (terminal No. 2) ignition coil relay connector.
triangle marks • Check power supply line for
open/short circuit.
NO : Repair or replace.
2 1
4 3 STEP 10. Perform resistance measurement at
Harness side connector AK301373AB B-14X ignition coil relay connector.
• Remove relay, and measure at relay box side. Connector: B-14X
• Ignition switch: ON
• Voltage between terminal No.2 and earth.
Relay box’s B-14X
OK: System voltage triangle marks
Q: Is the check result normal?
YES : Go to Step 10 .
NO : Go to Step 9 . 2 1
4 3
Harness side connector AK301373AB

• Remove relay, and measure at relay box side.

• Voltage between terminal No.3 and earth.
OK: 2Ω or less
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-356 TROUBLESHOOTING

Q: Is the check result normal?

STEP 12. Perform voltage measurement at B-104
YES : Go to Stop 11 .
NO : Check and repair harness between B-14X
and B-113 ignition coil connectors.
(terminal No.3) ignition coil relay connector Connector: B-104, B-113
and body earth. 3 2 1
• Check earthing line for open circuit Harness side
connector
and damage.

STEP 11. Perform voltage measurement at B-14X

ignition coil relay connector. B-104 (GR)
Connector: B-14X B-113 (GR)
AK301352 AB

Relay box’s B-14X • Disconnect connector, and measure at harness

triangle marks side.
• Engine: Cranking
• Voltage between terminal No. 3 and earth.
2 1
OK: 0.5 − 4.0 V
4 3
Q: Is the check result normal?
Harness side connector AK301373AB YES : Go to Step 18 .
NO : Go to Step 13 .
Connector: B-104, B-113
3 2 1
Harness side
connector

B-104 (GR)
B-113 (GR)
AK301352 AB

• Remove relay, and measure at relay box side.

• Voltage between terminal No.1 and earth.
OK: System voltage
Q: Is the check result normal?
YES : Check and repair harness between B-14X
(terminal No.4) ignition coil relay connector
and B-104 (terminal No.1) ignition coil
connector, also between B-14X (terminal
No.4) ignition coil relay connector and B-113
(terminal No.1) ignition coil connector.
• Check power supply line for
open/short circuit and damage.
NO : Check intermediate connector C-111 and
repair if necessary. If intermediate
connector is normal, check and repair
harness between B-14X (terminal No.1)
ignition coil connector and battery.
• Check power supply line for
open/short circuit and damage.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-357
STEP 13. Perform voltage measurement at C-123 STEP 14. Connector check: C-123 engine-ECU
engine-ECU <M/T> connector or C-122 <M/T> connector or C-122 engine-A/T-ECU <A/T>
engine-A/T-ECU <A/T> connector. connector
CONNECTOR: C-123 CONNECTOR: C-123

C-123 (Y) C-123 (Y)

13 12 11 10 9 8 7 6 5 4 3 2 1 13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14 26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector AK302353AB Harness side connector AK302353AB

Connector: C-122 Connector: C-122

C-122 (GR) C-122 (GR)

77 76 75 74 73 72 71 77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78 90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91 100 99 98 97 96 95 94 93 92 91
Harness side connector AK302359 AB Harness side connector AK302359 AB

Connector: B-104, B-113 Connector: B-104, B-113

3 2 1 3 2 1
Harness side Harness side
connector connector

B-104 (GR) B-104 (GR)

B-113 (GR) B-113 (GR)
AK301352 AB AK301352 AB

• Measure engine-ECU <M/T> or engine-A/T-ECU Q: Is the check result normal?

<A/T> terminal voltage. YES : Check and repair harness between B-113
• Disconnect B-104 and B-113 ignition coil (terminal No. 3) ignition coil connector and
connectors. C-123 (terminal No. 23) engine-ECU <M/T>
• Engine: Cranking connector or C-122 (terminal No. 12)
• Voltage between terminal No. 10 <M/T> or engine-A/T-ECU <A/T> connector, also
terminal No. 11 <A/T> and earth, also between between B-104 (terminal No. 3) ignition coil
terminal No. 23 <M/T> or terminal No. 12 <A/T> connector and C-123 (terminal No. 10)
and earth. engine-ECU <M/T> connector or C-122
OK: 0.5 − 4.0 V (terminal No. 11) engine-A/T-ECU <A/T>
Q: Is the check result normal? connector.
YES : Go to Step 14 . • Check output line for open circuit.
NO : Go to Step 15 . NO : Repair or replace.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-358 TROUBLESHOOTING

STEP 15. Connector check: C-123 engine-ECU STEP 16. Check harness between B-113 (terminal
<M/T> connector or C-122 engine-A/T-ECU <A/T> No. 3) ignition coil connector and C-123 (terminal
connector No. 23) engine-ECU <M/T> connector or C-122
CONNECTOR: C-123 (terminal No. 12) engine-A/T-ECU <A/T>
connector, also between B-104 (terminal No. 3)
ignition coil connector and C-123 (terminal No.
10) engine-ECU <M/T> connector or C-122
(terminal No. 11) engine-A/T-ECU <A/T>
connector.
C-123 (Y) Connector: B-104, B-113
3 2 1
13 12 11 10 9 8 7 6 5 4 3 2 1
Harness side
26 25 24 23 22 21 20 19 18 17 16 15 14 connector
Harness side connector AK302353AB

Connector: C-122

B-104 (GR)
B-113 (GR)
AK301352 AB

CONNECTOR: C-123
C-122 (GR)
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector AK302359 AB

Q: Is the check result normal?

C-123 (Y)
YES : Go to Step 11 .
NO : Repair or replace. 13 12 11 10 9 8 7 6 5 4 3 2 1
26 25 24 23 22 21 20 19 18 17 16 15 14
Harness side connector AK302353AB

Connector: C-122

C-122 (GR)
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector AK302359 AB

• Check output line for short circuit.

Q: Is the check result normal?
YES : Go to Step 17 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-359
STEP 17. Check the trouble symptoms. STEP 19. Check harness between C-201 (terminal
Q: Does trouble symptom persist?
No. 2) ignition switch connector and B-14X
YES : Replace engine-ECU <M/T> or (terminal No. 2) ignition coil relay connector.
engine-A/T-ECU <A/T>. CONNECTOR: C-201
NO : Intermittent malfunction (Refer to GROUP 3 2 1
00 − How to Use Troubleshooting/Inspection 6 5 4
Service Points P.00-6). Harness side connector

C-201
STEP 18. Perform resistance measurement at
B-104 and B-113 ignition coil connectors.
Connector: B-104, B-113
3 2 1
Harness side AK302351AB
connector
Connector: B-14X

Relay box’s B-14X

B-104 (GR) triangle marks
B-113 (GR)
AK301352 AB
2 1
• Disconnect connector, and measure at harness
4 3
side.
• Resistance between terminal No. 2 and earth. Harness side connector AK301373AB

OK: 2 Ω or less NOTE: Before checking harness, check intermediate

Q: Is the check result normal? connectors C-136, C-212 and C-210, and repair if
YES : Go to Step 19 . necessary.
NO : Check and repair harness between B-104 • Check power supply line for damage.
(terminal No. 2) ignition coil connector and Q: Is the check result normal?
body earth, also between B-113 (terminal YES : Go to Step 20 .
No. 2) ignition coil connector and body NO : Repair.
earth.
• Check earthing line for open circuit
and damage. STEP 20. Check harness between battery and
B-14X (terminal No. 1) ignition coil relay
connector.
Connector: B-14X

Relay box’s B-14X

triangle marks

2 1
4 3
Harness side connector AK301373AB

NOTE: Before checking harness, check intermediate

connector C-111 and repair if necessary.
• Check power supply line for damage.
Q: Is the check result normal?
YES : Go to Step 21 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-360 TROUBLESHOOTING

STEP 21. Check harness between B-14X STEP 22. Check harness between B-113 (terminal
(terminal No. 4) ignition coil relay connector and No. 3) ignition coil connector and C-123 (terminal
B-104 (terminal No. 1) ignition coil connector, No. 23) engine-ECU <M/T> connector or C-122
also between B-14X (terminal No. 4) ignition coil (terminal No. 12) engine-A/T-ECU <A/T>
relay connector and B-113 (terminal No. 1) connector, also between B-104 (terminal No. 3)
ignition coil connector. ignition coil connector and C-123 (terminal No.
Connector: B-14X
10) engine-ECU <M/T> connector or C-122
(terminal No. 11) engine-A/T-ECU <A/T>
connector.
Relay box’s B-14X
triangle marks Connector: B-104, B-113
3 2 1
Harness side
connector
2 1
4 3
Harness side connector AK301373AB
B-104 (GR)
Connector: B-104, B-113 B-113 (GR)
3 2 1
AK301352 AB
Harness side
connector
CONNECTOR: C-123

B-104 (GR)
B-113 (GR)
AK301352 AB C-123 (Y)

• Check power supply line for damage. 13 12 11 10 9 8 7 6 5 4 3 2 1

26 25 24 23 22 21 20 19 18 17 16 15 14
Q: Is the check result normal? Harness side connector AK302353AB
YES : Go to Step 22 .
NO : Repair.
Connector: C-122

C-122 (GR)
77 76 75 74 73 72 71
90 89 88 87 86 85 84 83 82 81 80 79 78
100 99 98 97 96 95 94 93 92 91
Harness side connector AK302359 AB

• Check output line for damage.

Q: Is the check result normal?
YES : Go to Step 17 .
NO : Repair.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-361
DATA LIST REFERENCE TABLE
M1131152000887

Item Inspection Inspection condition Normal condition Inspection Reference

No. item procedure page
No.
11 Oxygen Engine: After Excessive deceleration 200 mV or less Code No. P.13A-70
sensor warm-up (leaner by from 4,000 r/min → 600 − 1,000 P0130
(front) deceleration, richer mV (After
by acceleration) several seconds
have elapsed)
At excessive 600 − 1,000 mV
acceleration
Engine: After Idle operation 400 mV or less
warm-up (using 2,500 r/min ⇔ 600 − 1,000
oxygen sensor, mV (altered)
check air-fuel ratio
as well as control
status by
engine-ECU <M/T>
or engine-A/T-ECU
<A/T>.
13 Intake air Ignition switch: Intake air temperature: −20°C Code No. P.13A-30
temperature “ON” or engine −20°C P0110
sensor running Intake air temperature: 0°C
0°C
Intake air temperature: 20°C
20°C
Intake air temperature: 40°C
40°C
Intake air temperature: 80° C
80°C
14 Throttle Ignition switch: Set to Idle position 335 − 935 mV Code No. P.13A-52
position “ON” Press down accelerator Increased P0120
sensor pedal gradually according to
accelerator
pedal stroke
Press down accelerator 4,500 − 5,000
pedal fully mV
16 Power Ignition switch: “ON” System voltage Procedure P.13A-307
supply No. 23
voltage
18 Cranking Ignition switch: Engine: Stopped OFF Procedure P.13A-307
signal “ON” Engine: Cranking ON No. 23
(ignition
switch-ST)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-362 TROUBLESHOOTING

Item Inspection Inspection condition Normal condition Inspection Reference

No. item procedure page
No.
21 Engine Ignition switch: Coolant temperature: −20°C Code No. P.13A-41
coolant “ON” or engine −20°C P0115
temperature running Coolant temperature: 0°C
sensor 0°C
Coolant temperature: 20°C
20°C
Coolant temperature: 40°C
40°C
Coolant temperature: 80°C
80°C
22 Crank angle • Engine: Compare engine speed Matched Code No. P.13A-149
sensor Cranking on tachometer with the P0335
• Tachometer: value displayed on
Connected MUT-II/III
Engine: Idle Coolant temperature: 1,330 − 1,530
operation −20°C r/min
Coolant temperature: 1,210 − 1,410
0°C r/min
Coolant temperature: 1,100 − 1,300
20°C r/min
Coolant temperature: 950 − 1,150
40°C r/min
Coolant temperature: 650 − 850 r/min
80°C
27 Power Engine: Idle Steering wheel: OFF Code No. P.13A-202
steering operation Stationary P0551
fluid Steering wheel: Turning ON
pressure
switch
28 A/C switch Engine: Idle AC switch: OFF OFF Procedure P.13A-337
operation AC A/C OFF No. 26
switch: compressor is
ON not driven
A/C ON
compressor is
driven
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-363
Item Inspection Inspection condition Normal condition Inspection Reference
No. item procedure page
No.
32 Manifoid Ignition switch: Altitude: 0m 101kPa Code P.13B-28
absolute "ON" Altitude: 600m 95kPa No.P0105
pressure
sensor Altitude: 1,200m 88kPa
Altitude: 1,800m 81kPa
• Engine coolant Idle operation 21.3 − 34.7 kPa
temperature: 85 Excessive acceleration Increased
− 95°C
• Lamps, electric
cooling fan and
all accessories:
OFF
• Transmission :
Neutral <M/T>
or P range
<A/T>
37 Volumetric • Engine coolant Idel operation 15 − 35% − −
efficiency temperature: 85 2,500 r/min 15 − 35%
− 95°C
• Lamps, electric Excessive acceleration According to
cooling fan and acceleration,
all accessories: volumetric
OFF efficiency is
increased.
41 Injector Engine: Cranking Coolant temperature: 40 − 60 ms − −
*1 0°C (all cylinders in
drive time
simultaneous injecting
operation)
Coolant temperature: 22.4 − 33.6 ms
20°C
Coolant temperature: 6.4 − 9.6 ms
80°C
Injector • Engine coolant Idle operation 1.7 − 2.9 ms
drive time*2 temperature: 85 2,500 r/min 1.7 − 2.9 ms
− 95°C
• Lamps, electric Excessive acceleration Increased
cooling fan and
all accessories:
OFF
• Transmission :
Neutral <M/T>
or P range
<A/T>
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-364 TROUBLESHOOTING

Item Inspection Inspection condition Normal condition Inspection Reference

No. item procedure page
No.
44 Ignition • Engine: After Idle operation 2 − 18°BTDC Procedure P.13A-346
advance warm-up 2,500 r/m −2 − 18°BTDC No. 28 <L. <L. H.
• Install timing H. drive drive
light (for use to vehicles> vehicles>,
measure actual Procedure P.13A-353
ignition timing) No. 29 <R. <R. H.
H. drive drive
vehicles> vehicles>
45 ISC • Engine coolant A/C switch: OFF 2 − 25 steps − −
(stepper temperature: 80 A/C switch: OFF → ON Increased 10 −
motor) − 95°C 70 steps
servo • Lighting, electric
position*3 cooling fan and
accessories:
OFF
• Transmission :
Neutral <M/T>
or P range
<A/T>
• Engine: Idle
operation (When
A/C switch is
ON, A/C
compressor
must be ON)
49 A/C relay Engine: Idle A/C switch: OFF OFF Procedure P.13A-341
operation after A/C A/C OFF No. 26
warm-up switch: compressor is
ON not driven
A/C ON
compressor is
driven
59 Oxygen Engine: After At excessive 0 mV or less ⇔ Code No. P.13A-86
sensor warm-up acceleration 600 - 1,000 mV P0136
(rear) (altered)
13* Intake air Ignition switch: Intake air temperature: −20°C Code No. P.13A-30
4 temperature “ON” or engine −20°C P0110
sensor running Intake air temperature: 0°C
0°C
Intake air temperature: 20°C
20°C
Intake air temperature: 40°C
40°C
Intake air temperature: 80° C
80°C
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-365
Item Inspection Inspection condition Normal condition Inspection Reference
No. item procedure page
No.

21* Engine Ignition switch: Coolant temperature: −20°C Code No. P.13A-41
4 coolant “ON” or engine −20°C P0115
temperature running Coolant temperature: 0°C
sensor 0°C
Coolant temperature: 20°C
20°C
Coolant temperature: 40°C
40°C
Coolant temperature: 80°C
80°C
22* Crank angle • Engine: Compare engine speed Matched − −
4 sensor Cranking on tachometer with the
• Tachometer: value displayed on
Connected MUT-II/III
Engine: Idle Coolant temperature: 1,330 − 1,530
operation −20°C r/min
Coolant temperature: 1,210 − 1,410
0°C r/min
Coolant temperature: 1,100 − 1,300
20°C r/min
Coolant temperature: 950 − 1,150
40°C r/min
Coolant temperature: 650 − 850 r/min
80°C
24* Vehicle Drive 40 km/h Approximately Code No. P.13A-189
4 speed 40 km/h P0500
sensor
32* Manifoid Ignition switch: Altitude: 0m 101kPa Code No. P.13B-28
4 absolute "ON" Altitude: 600m 95kPa P0105
pressure
sensor Altitude: 1,200m 88kPa
Altitude: 1,800m 81kPa
• Engine coolant Idle operation 21.3 − 34.7 kPa
temperature: 85 Excessive acceleration Increased
- 95°C
• Lamps, electric
cooling fan and
all accessories:
OFF
• Transmission :
Neutral<M/T> or
P range<A/T>
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-366 TROUBLESHOOTING

Item Inspection Inspection condition Normal condition Inspection Reference

No. item procedure page
No.

44* Ignition • Engine: After Idle operation 2 − 18 deg − −

4 advance warm-up 2,500 r/m −2 −18 deg
• Install timing
light (for use to
measure actual
ignition timing)
81* Long-term Engine: After warm-up, 2,500 r/min without −12.5 − 12.5% Code No. P.13A-103
4 fuel any load (during closed loop) P0170
compensati
on
82* Shot-term Engine: After warm-up, 2,500 r/min without −20 − 20% Code No. P.13A-103
4 fuel any load (during closed loop) P0170
compensati
on
87* Calculation Engine: After Idle operation 15 − 35% − −
4 losd value warm-up 2,500 r/m 15 − 35%
88* Fuel control Engine: After 2,500 r/m Closed loop − −
4 condition warm-up Acceleration Open loop-drive
condition
8A* Throttle Ignition switch: Set to Idle position 0 − 10% Code No. P.13A-52
4 position “ON” Press down accelerator Increased P0120
sensor pedal gradually according to
(Throttle accelerator
opening pedal stroke
angle)
Press down accelerator 80 − 100%
pedal fully
A1* Oxygen Engine: After Excessive deceleration 0.2 V or less → Code No. P.13A-70
4 sensor warm-up (leaner by from 4,000 r/min 0.6 − 1 V (After P0130
(front) deceleration, richer several seconds
by acceleration) have elapsed)
Ax excessive 600 − 1,000 mV
acceleration
Engine: After Idle operation 0.4 V or less ⇔
warm-up (using 2,500 r/min 0.6 − 1 V
oxygen sensor, (altered)
check air-fuel ratio
as well as control
status by
engine-A/ECU.
A2* Oxygen Engine: After At excessive 0 V or less ⇔ Code No. P.13A-86
4 sensor warm-up acceleration 0.6 − 1 V P0136
(rear) (altered)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-367
! CAUTION
When shifting the select lever to D range, the brakes should be applied so that the vehicle does not
move forward
NOTE: *1: Injector drive time ranges shown are when power voltage is 11 V and the cranking speed is 250
r/min. or less.
NOTE: *2: On the new vehicle (mileage: 500 km or less), injector drive time may be longer by approximately
10%.
NOTE: *3: On the new vehicle (mileage: 500 km or less), the number of steps of stepper motor may be larger
by approximately 30 steps.
NOTE: *4: When service data in check mode is selected, the data is not displayed.

ACTUATOR TEST REFERENCE TABLE

M1131152500503

Item Inspection Drive content Inspection conditions Normal Code No. Reference
No. item condition /Inspection page
procedure
No.
01 Injector Cut off No. 1 Engine: After warm-up, Engine is Code No. P.13A-108
injector idle operation (Cut off changed P0201
02 Cut off No. 2 injectors sequentially to (becomes Code No. P.13A-113
injector check for a cylinder that unstable or P0202
does not change engine in stalled)
03 Cut off No. 3 idle status. Code No. P.13A-118
injector P0203
04 Cut off No. 4 Code No. P.13A-123
injector P0204
07 Fuel pump Drive fuel pump Ignition Hold return Pulse is felt Procedure P.13A-319
to circulate fuel switch: "ON" hose with No. 24
fingers to
feel pulse of
fuel flowing
Check for Operating
pump noise audible
operating
noise near
fuel tank
08 Purge Switch solenoid Ignition switch: "ON" When the valve Code No. P.13A-181
control valve from OFF is actuated, P0443
solenoid to ON operating noise
valve is audible
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-368 TROUBLESHOOTING

Item Inspection Drive content Inspection conditions Normal Code No. Reference
No. item condition /Inspection page
procedure
No.
10 EGR control Switch solenoid Ignition switch: "ON" When the valve Code No. P.13A-174
solenoid valve from OFF is actuated, P0403
valve to ON operating noise
is audible.
17 Basic ignition Switch • Engine: Idle operation 5° BTDC − −
timing engine-ECU • Install timing light
<M/T> or
engine-A/T-ECU
<A/T> to ignition
timing adjusting
mode
21 Fan Actuate fan • Ignition switch: "ON" Fan motor is Procedure P.13A-300
controller motor • A/C switch: ON rotated No. 21

CHECK AT THE ECU TERMINALS NOTE: .

M1131153500205 1. Make the voltage measurement with the
TERMINAL VOLTAGE CHECK CHART engine-ECU <M/T> or engine-A/T-ECU <A/T>
connector connected.
Needle-nosed wire probe 2. You may find it convenient to pull out the
engine-ECU <M/T> or engine-A/T-ECU <A/T>
to make it easier to reach the connector
terminals.
3. The checks can be carried out off the order
given in the chart.
! CAUTION
Short-circuiting the positive (+) probe between a
AK201749AB connector terminal and earth could damage the
vehicle wiring, the sensor, engine-ECU <M/T> or
1. Connect a needle-nosed wire probe to a voltmeter engine-A/T-ECU <A/T> or all of them. Be careful
probe. to prevent this!
2. Insert the needle-nosed wire probe into each of 3. If voltmeter shows any division from standard
the engine-ECU <M/T> or engine-A/T-ECU <A/T> value, check the corresponding sensor, actuator
connector terminals from the wire side, and and related electrical wiring, then repair or
measure the voltage while referring to the check replace.
chart.
4. After repair or replacement, recheck with the
voltmeter to confirm that the repair has corrected
the problem.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-369
ENGINE-ECU <M/T> OR ENGINE-A/T-ECU <A/T> CONNECTOR TERMINAL
ARRANGEMENT
Engine-ECU Connector

C-123 C-125 C-127 C-129

1 2 3 4 5 6 7 8 9 10 11 12 13 31 32 33 34 35 36 37 38 51 52 53 54 55 56 71 72 73 74 75 76 77 78 79 80 81
14 15 16 17 18 19 20 21 22 23 24 25 26 39 40 41 42 43 44 45 46 57 58 59 60 61 62 82 83 84 85 86 87 88 89 90 9192

AK301374 AB

Engine-A/T-ECU Connector

C-122 C-124 C-126 C-128

41 42 43 44 45 46 71 72 73 74 75 76 77 101 102 103 104 105 106 107
1 2 3 4 5 6 7 8 9 10 11 12 13 47 48 49 50 51 52 53 54 55 56 57 78 79 80 81 8283 8485 8687 88 89 108 109 110 111 112113 114115 116 117 118 119 120
14 15 16 17 18 19 20 21 22 23 24 25 26 58 59 60 61 62 63 64 65 66 90 91 92 93 94 9596 97 98 121 122123 124 125 126 127 128 129 130

AK301375 AB

Terminal Terminal Check item Check condition (Engine condition) Normal condition
No. No.
<M/T> <A/T>
1 1 No. 1 injector While engine is idling after having From 11 − 14 V,
14 9 No. 2 injector warmed up, suddenly depress the momentarily drops
accelerator pedal. slightly
2 24 No. 3 injector
15 2 No. 4 injector
4 14 Stepper motor coil • Engine: Soon after the warmed up System voltage ⇔ 1 V
<A1> engine is stared or less (Changes
17 28 Stepper motor coil • A/C switch: OFF → ON (A/C repeatedly)
<A2> compressor is operating)
5 15 Stepper motor coil
<B1>
18 29 Stepper motor coil
<B2>
6 6 EGR control Ignition switch: "ON" System Voltage
solenoid Valve While engine is idling, suddenly From system voltage,
depress the accelerator pedal. momentarily drops
8 20 A/C relay • Engine: Idle speed System voltage or
• A/C switch: OFF → ON (A/C Momentarily 6 V or
compressor is operating) more → 1 V or less
9 34 Purge control Ignition switch: "ON" System voltage
solenoid valve Running at 3,500 r/min while engine is 1 V or less
warming up after having been started.
10 11 Ignition coil − No. 1, Engine r/min: 3,000 r/min 0.3 − 3.0 V
No. 4
23 12 Ignition coil − No. 2,
No. 3
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-370 TROUBLESHOOTING

Terminal Terminal Check item Check condition (Engine condition) Normal condition
No. No.
<M/T> <A/T>
12 41 Power supply Ignition switch: "ON" System voltage
25 47
21 18 Fan controller Radiator and condenser fan is not 0 − 0.3 V
operating
Radiator and condenser fan is 0.7 V or more
operating
22 21 Fuel pump relay Ignition switch: ON System voltage
Engine: Idle speed 1 V or less
24 61 A/C load signal Refer to GROUP 55 - Troubleshooting (Inspection at the
Automatic compressor - ECU Terminal)
33 8 Alternator G terminal • Engine: Warm, idle (radiator fan: Voltage increases by
OFF) 0.2 − 3.5 V
• Headlamp: OFF → ON
• Stop lamp: OFF → ON
• Rear defogger switch: OFF → ON
36 22 Engine warming Ignition switch: "LOCK" (OFF) → "ON" 1 V or less → System
lamp voltage (After several
seconds have
elapsed)
37 52 Power steering fluid Engine: Idling When steering System voltage
pressure switch after warming up wheel is
stationary
When steering 1 V or less
wheel is turned
38 49 Control relay (Power Ignition switch: "LOCK" (OFF) System voltage
supply) Ignition switch: "ON" 1 V or less
41 54 Alternator FR • Engine: Warm, idle (radiator fan: Voltage decreases
terminal OFF)
• Headlamp: OFF → ON
• Stop lamp: OFF → ON
• Rear defogger switch: OFF → ON
45 83 A/C switch Engine: Idle Turn the A/C 0.5 V or less
speed switch OFF
Turn the A/C System voltage
switch ON (A/C
compressor is
operating)
54 26 Oxygen sensor Engine: Idling after warming up 1 V or less
heater (rear) Engine: Racing System voltage
58 43 Tachometer signal Engine: 3,000 r/min 0.3 − 3.0 V
60 3 Oxygen sensor Engine: Idling after warming up 1 V or less
heater (front) Engine: 5,000 r/min System voltage
71 58 Ignition switch-ST Engine: Cranking 8 V or more
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-371
Terminal Terminal Check item Check condition (Engine condition) Normal condition
No. No.
<M/T> <A/T>
72 64 Intake air Ignition switch: When intake air 3.8 − 4.4 V
temperature sensor "ON" temperature is
−20°C
When intake air 3.2 − 3.8 V
temperature is
0°C
When intake air 2.3 − 2.9 V
temperature is
20°C
When intake air 1.5 − 2.1 V
temperature is
40°C
When intake air 0.8 − 1.4 V
temperature is
60°C
When intake air 0.4 − 1.0 V
temperature is
80°C
75 73 Oxygen sensor Engine: Idling after warmed up 0 ⇔ 0.6 V (Changes
(rear) (Check using a digital type voltmeter) repeatedly)
76 71 Oxygen sensor Engine: Running at 2,500 r/min after 0 ⇔ 0.8 V (Changes
(front) warmed up (Check using a digital type repeatedly)
voltmeter)
80 66 Backup power Ignition switch: "LOCK" (OFF) System voltage
supply
81 46 Sensor impressed Ignition switch: "ON" 4.9 − 5.1 V
voltage
82 98 Ignition switch-IG Ignition switch: "ON" System voltage
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-372 TROUBLESHOOTING

Terminal Terminal Check item Check condition (Engine condition) Normal condition
No. No.
<M/T> <A/T>
83 44 Engine coolant Ignition switch: When engine 3.9 − 4.5 V
temperature sensor "ON" coolant
temperature is
−20°C
When engine 3.2 − 3.8 V
coolant
temperature is
0°C
When engine 2.3 − 2.9 V
coolant
temperature is
20°C
When engine 1.3 − 1.9 V
coolant
temperature is
40°C
When engine 0.7 − 1.3 V
coolant
temperature is
60°C
When engine 0.3 − 0.9 V
coolant
temperature is
80°C
84 78 Throttle position Ignition switch: Set throttle valve 0.335 − 0.935 V
sensor "ON" to idle Position
Fully open throttle 4.5 − 5.0 V
valve
85 55 Manifold absolute Ignition switch: Altitude: 0 m 3.8 − 4.2 V
pressure sensor "ON" Altitude: 600 m 3.5 − 3.9 V
Altitude: 1200 m 3.3 − 3.7 V
Altitude: 1800 m 3.0 − 3.4 V
Engine: Idling after warming up 0.9 − 1.5 V
While engine is idling after having From 0.9 − 1.5 V,
warmed up, suddenly depress the momentarily
accelerator pedal. increases
86 − Vehicle speed • Ignition switch: "ON" 0 ⇔ 5 V Changes
sensor • Move the vehicle forword slowly repeatedly
88 56 Camshaft position Engine: Cranking 0.4 − 3.0 V
sensor Engine: Idling 1.5 − 3.0 V
89 45 Crank angle sensor Engine: Cranking 0.4 − 4.0 V
Engine: Idling speed 1.5 − 2.5 V

CHECK CHART FOR RESISTANCE AND CONTINUITY BETWEEN TERMINALS

1. Turn the ignition switch to "LOCK" (OFF) position.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-373
2. Disconnect the engine-ECU <M/T> or ! CAUTION
engine-A/T-ECU <A/T> connector. If the terminals that should be checked are
3. Measure the resistance and check for continuity mistaken, or if connector terminals are not
between the terminals of the engine-ECU <M/T> correctly shorted to earth, damage may be
or engine-A/T-ECU <A/T> harness-side connector caused to the vehicle wiring, sensors,
while referring to the check chart. engine-ECU <M/T> or engine-A/T-ECU <A/T>
NOTE: . and/or ohmmeter. Be careful to prevent this!
1. When measuring resistance and checking 4. If the ohmmeter shows any deviation from the
continuity, a harness for checking contact pin standard value, check the corresponding sensor,
pressure should be used instead of inserting a actuator and related electrical wiring, and the
test probe. repair or replace.
2. Checking need not be carried out in the order 5. After repair or replacement, recheck with the
given in the chart. ohmmeter to confirm that the repair or
replacement has corrected the problem.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-374 TROUBLESHOOTING

ENGINE-ECU <M/T> OR ENGINE-A/T-ECU <A/T> HARNESS SIDE CONNECTOR

TERMINAL ARRANGEMENT
Engine-ECU Harness side connector

C-129 C-127 C-125 C-123

8180 79 78 77 76 75 74 73 72 71 56 55 54 53 52 51 38 37 36 35 34 33 32 31 13 12 11 10 9 8 7 6 5 4 3 2 1
92 91 90 89 88 87 86 85 84 83 82 62 61 60 59 58 57 46 45 44 43 42 41 40 39 26 25 24 23 22 21 20 19 18 17 16 15 14

AK301376 AB

Engine-A/T-ECU Harness side connector terminal arrangement

C-128 C-126 C-124 C-122

107 106 105 104 103 102 101 77 76 75 74 73 72 71 46 45 44 43 42 41
120 119 118 117 116 115 114113 112 111 110 109 108 89 88 87 86 85 84 83 82 81 80 79 78 57 56 55 54 53 52 51 50 49 48 47 13 12 11 10 9 8 7 6 5 4 3 2 1
130 129 128 127 126 125 124 123 122 121 98 97 96 95 94 93 92 91 90 66 65 64 63 62 61 60 59 58 26 25 24 23 22 21 20 19 18 17 16 15 14

AK301377AB

Terminal Terminal Inspection item Normal condition (Check condition)

No. No.
<M/T> <A/T>
1 − 12 1 − 42 No. 1 injector 13 − 16 Ω (At 20°C)
12 − 14 9 − 42 No. 2 injector
2 − 12 24 − 42 No. 3 injector
12 − 15 2 − 42 No. 4 injector
4 − 12 14 − 42 Stepper motor coil (A1) 28 − 33 Ω (At 20°C)
12 − 17 28 − 42 Stepper motor coil (A2)
5 − 12 15 − 42 Stepper motor coil (B1)
12 − 18 29 − 42 Stepper motor coil (B2)
6 − 12 4 − 42 EGR control solenoid valve 29 − 35 Ω (At 20°C)
9 − 12 34 − 42 Purge control solenoid 30 − 34 Ω (At 20°C)
valve
12 − 54 26 − 42 Oxygen sensor heater 4.5 − 8.0 Ω (At 20°C)
(rear)
12 − 60 3 − 42 Oxygen sensor heater 4.5 − 8.0 Ω (At 20°C)
(front)
13 − Body 42 − Body ECU earth Continuity (0 Ω)
earth earth
26 − Body 76 − Body
earth earth
81 − 83 44 − 57 Engine coolant temperature 14 − 17 kΩ (When coolant temperature is −20°C)
sensor 5.1 − 6.5 kΩ (When coolant temperature is 0°C)
2.1 − 2.7 kΩ (When coolant temperature is 20°C)
0.9 − 1.3 kΩ (When coolant temperature is 40°C)
0.48 − 0.68 kΩ (When coolant temperature is 60°C)
0.26 − 0.36 kΩ (When coolant temperature is 80°C)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-375
Terminal Terminal Inspection item Normal condition (Check condition)
No. No.
<M/T> <A/T>
72 − 81 57 − 64 Intake air temperature 13 − 17 kΩ (When intake air temperature is −20°C)
sensor 5.3 − 6.7 kΩ (When intake air temperature is 0°C)
2.3 − 3.0 kΩ (When intake air temperature is 20°C)
1.0 − 1.5 kΩ (When intake air temperature is 40°C)
0.56 − 0.76 kΩ (When intake air temperature is 60°C)
0.30 − 0.42 kΩ (When intake air temperature is 80°C)

INSPECTION PROCEDURE USING 2. Connect the oscilloscope special pattern pickup to

OSCILLOSCOPE camshaft position sensor terminal No. 2.
M1131154500606 3. Disconnect the crank angle sensor connector and
The output signals of the sensors and the conditions connect the special tool test harness (MD998478)
of the actuation signals of the actuators can be in between.
inspected visually by observing the waveforms on 4. Connect the oscilloscope special patterns pickup
the oscilloscope. to crank angle sensor terminal No. 2.
CAMSHAFT POSITION SENSOR AND
Alternate Method (Test harness not available)
CRANK ANGLE SENSOR
1. Connect the oscilloscope special patterns pickup
Measurement Method to engine-ECU terminal No. 88 <M/T> or
Camshaft position Oscilloscope engine-A/T-ECU terminal No. 56 <A/T> (When
sensor connector checking the camshaft position sensor signal
1 2 3 Special patterns wave pattern).
pick-up 2. Connect the oscilloscope special patterns pickup
to engine-ECU terminal No. 89 <M/T> or
engine-A/T-ECU terminal No. 45 <A/T> (When
checking the crank angle sensor signal wave
1 2 pattern).
3 Crank angle
sensor connector Standard Wave Pattern
AK000840AC
Observation condition
1. Disconnect the camshaft position sensor
connector and connect the special tool test Function Special patterns
harness (MB991709) in between (All terminals Pattern height Low
should be connected). Pattern selector Display
Engine speed Idle
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-376 TROUBLESHOOTING

Standard wave pattern (V) 2 engine revolutions

(1 camshaft revolution) The time (cycle time) T is
reduced when the engine
75˚BTDC speed increases
5˚BTDC T

Crank angle
sensor output
wave pattern

Camshaft position
sensor output
wave pattern

Time
0
TDC: Top dead centre No. 1 TDC No. 2 TDC No. 3 TDC No. 4 TDC AK103538AF

Wave Pattern Observation Points Wave pattern characteristics

Check that cycle time T becomes shorter when the Rectangular wave pattern is output even when
engine speed increases. the engine is not started.
•

Examples of Abnormal Wave Patterns

•

AKX01602

AKX01597
Example 2
Cause of problem
Example 1
Loose timing belt
Cause of problem Abnormality in sensor disk
Sensor interface malfunction
Wave pattern characteristics
Wave pattern is displaced to the left or right.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-377
INJECTOR Alternate Method (Test harness not available)
Measurement Method 1. Connect the oscilloscope special patterns pickup
to engine- ECU terminal No. 1 <M/T> or
engine-A/T-ECU terminal No. 1 <A/T> (When
Oscilloscope
checking the No. 1 cylinder).
2. Connect the oscilloscope special patterns pickup
to engine-ECU terminal No. 14 <M/T> or
1 2
engine-A/T-ECU terminal No. 9 <A/T> (When
Special checking the No. 2 cylinder).
patterns 3. Connect the oscilloscope special patterns pickup
pickup
to engine-ECU terminal No. 2 <M/T> or
engine-A/T-ECU terminal No. 24 <A/T> (When
AK101807AC checking the No. 3 cylinder).
1. Disconnect the injector connector, and then 4. Connect the oscilloscope special patterns pickup
connect the special tool test harness set to engine-ECU terminal No. 15 <M/T> or
(MB991348) in between (All terminals should be engine-A/T-ECU terminal No. 2 <A/T> (When
connected). checking the No. 4 cylinder).
2. Connect the oscilloscope special patterns pickup
to terminal No. 2 of the injector connector.

Standard Wave Pattern

Observation conditions
Function Special patterns
Pattern height Variable
Variable knob Adjust while viewing the
wave pattern
Pattern selector Display
Engine speed Idle

Standard wave pattern

(V) Point A

Solenoid back
50 electromotive
force
(Approximately 7 × 10 V)

Point B
Injector drive
time
Time
Power
voltage

0 Drive signal: ON Drive signal: OFF

AK202347AC
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-378 TROUBLESHOOTING

Wave Pattern Observation Points IDLE SPEED CONTROL (ISC) SERVO

Point A: Height of solenoid back electromotive force (STEPPER MOTOR)
Contrast with standard wave Probable Measurement Method
pattern cause
Solenoid coil back electromotive Short in the Oscilloscope
force is low or doesn’t appear at injector solenoid
all. 1 2 3
4 5 6
Point B: Injector drive time
•
Special
patterns
pickup

AK300344AB

1. Disconnect the ISC servo connector, and connect

the special tool test harness (MB991709) in
between.
When idling 2. Connect the oscilloscope special patterns pickup
When racing AKX01605AE to the ISC servo- side connector terminal No. 1,
The injector drive time will be synchronized with the No. 3, No. 4 and No. 6 respectively.
MUT-II/III tester display.
• When the engine is suddenly raced, the drive Alternate Method (Test harness not available)
time will be greatly extended at first, but the drive 1. Connect the oscilloscope special patterns pickup
time will soon match the engine speed. to engine-ECU terminal No. 4 <M/T> or
engine-A/T-ECU terminal No. 14 <A/T>,
connection terminal No. 5 <M/T> or
engine-A/T-ECU terminal No. 15 <A/T>,
connection terminal No. 17 <M/T> or
engine-A/T-ECU terminal No. 28 <A/T>, and
connection terminal No. 18 <M/T> or
engine-A/T-ECU terminal No. 29 <A/T>
respectively.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-379
Standard Wave Pattern
Observation conditions
Function Special patterns
Pattern height High
Pattern selector Display
Engine condition When the engine coolant
temperature is 20°C or
below, turn the ignition
switch from LOCK (OFF)
position to ON (without
starting the engine).
While the engine is
idling, turn the A/C
switch to ON.
Immediately after
starting the warm
engine.

Standard wave pattern

(V) The wave pattern

appears for an
instant, but soon Point B
Point A
disappears. Coilreverse electromotive Induced electromotive force
30 force (Approximately 3 × 10 V)
from the motor turning

Stepper 20
motor
control
signal
wave 10
pattern

Time

AK201857 AC
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-380 TROUBLESHOOTING

Wave pattern Observation Points

Check that the standard wave pattern appears when Example 2
the stepper motor is operating. Cause of problem
Point A: Presence or absence of induced Open circuit in the line between the stepper
electromotive force from the motor turning (Refer to motor and the engine-ECU <M/T> or
the abnormal wave pattern). engine-A/T-ECU <A/T>.
Contrast with standard wave Probable Wave pattern characteristics
pattern cause Current is not supplied to the motor coil on the
Induced electromotive force does Motor is open circuit side (Voltage does not drop to 0 V).
not appear or is extremely small. malfunctioning Furthermore, the induced electromotive force
waveform at the normal side is slightly different
Point B: Height of coil reverse electromotive force from the normal waveform.
Contrast with standard wave Probable
pattern cause IGNITION COIL AND POWER
Coil reverse electromotive force Short in the TRANSISTOR
does not appear or is extremely coil Measurement Method
small.
Oscilloscope
Examples of Abnormal Wave Pattern
•

1 2 3
Special
patterns
pickup

AK300345 AB

1. Disconnect the ignition coil connector, and

AKX01608AE connect the special tool test harness set
(MB991348) in between (All terminals should be
Example 1
connected).
Cause of problem 2. Connect the oscilloscope special patterns pickup
Motor is malfunctioning. (Motor is not operating.) to terminal No. 3 of each ignition coil connector in
Wave pattern characteristics turn.
Induced electromotive force from the motor
turning does not appear. Alternate Method (Test harness not available)
•

1. Connect the oscilloscope special patterns pickup

to engine-ECU terminal No. 10 (No. 1 − No. 4)
Open
circuit <M/T> or engine-A/T-ECU terminal No. 11 (No. 1
side − No. 4) <A/T>, connection terminal No. 23 (No. 2
− No. 3) <M/T> or engine-A/T-ECU terminal No.
12 (No. 2 − No. 3) <A/T> respectively.

Normal
side
AKX01609AF
 MULTIPORT FUEL INJECTION (MFI) <4G1>
TROUBLESHOOTING
13A-381
Standard Wave Pattern
Observation condition
Function Special patterns
Pattern height Low
Pattern selector Display
Engine r/min Approximately 1,200
r/min
Standard wave pattern
(V)
6 T

5˚ BTDC
4 75˚ BTDC
Crank angle Compression top dead center
sensor output 2
wave pattern
0

Power transistor T1
2 Ignition period
control signal
wave pattern
0

OFF ON
Dwell section

T : Revolution time corresponding to a crank angle of 180˚

T1 : Time computed by the engine-ECU <M/T> or engine-A/T-ECU <A/T>
: Spark advance angle
AK204435 AE

Wave Pattern Observation Points Examples of Abnormal Wave Patterns

Point: Condition of wave pattern build-up section and
•

maximum voltage (Refer to abnormal wave pattern

examples 1 and 2). Normal wave pattern
Condition of wave pattern Probable cause
build-up section and
maximum voltage
Rises from approximately 2 V Normal 2V
to approximately 4.5 V at the
top-right
AKX01612AD
2 V rectangular wave Open-circuit in
ignition primary Example 1
circuit Wave pattern during engine cranking
Rectangular wave at power Power transistor Cause of problem
voltage malfunction Open-circuit in ignition primary circuit
Wave pattern characteristics
Top-right part of the build-up section cannot be
seen, and voltage value is approximately 2 V too
low.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-382 TROUBLESHOOTING

Cause of problem
•

Normal wave pattern Malfunction in power transistor

VB Wave pattern characteristics
Power voltage results when the power transistor
is ON.

AKX01613AD

Example 2
Wave pattern during engine cranking
 MULTIPORT FUEL INJECTION (MFI) <4G1>
ON-VEHICLE SERVICE
13A-383
ON-VEHICLE SERVICE
THROTTLE BODY (THROTTLE VALVE
AREA) CLEANING
M1131001000451
1. Remove the air intake hose from the throttle body. Throttle position
2. Spray cleaning fluid on a clean cloth. sensor

! CAUTION
• Do not spray the cleaning fluid directly to the
throttle valve. MB991536
• Make sure the cleaning fluid does not enter
the motor from the bypass line. Also make AK201752AB
sure it does not enter the sensor through the
shaft. (1) Disconnect the throttle position sensor
• Be careful not to rub off the molybden applied connector and connect the special tool test
around the throttle valve shaft. harness (MB991536) between the
disconnected connector taking care not to
confuse the terminal to be connected.
(2) Connect digital voltmeter between the terminal
No. 2 (special tool’s yellow clip on the sensor
15 mm output) and the terminal No. 4 (special tool’s
15 mm red clip on the sensor earth) of the throttle
position sensor connector.
2. Turn the ignition switch to "ON" position (but do
not start the engine).
Areas on throttle valve to 3. Check the output voltage of the throttle position
apply molybdenum disulfide AK000833AD sensor.
3. Wipe off the dirt around the throttle valve with the Standard value: 335 − 935 mV
cloth sprayed with cleaning fluid.
Throttle position
4. Attach the air intake hose. sensor
5. Adjust the basic idle speed (Refer to P.13A-384).

THROTTLE POSITION SENSOR

ADJUSTMENT
M1131001100544

Throttle position
sensor
AK301380 AB

4. If not within the standard value, loosen the throttle

position sensor mounting bolts. Then rotate the
sensor body to adjust.
1 2 3 5. Turn the ignition switch to "LOCK" (OFF) position.
6. Remove the MUT-II/III. If the MUT-II/III is not
Equipment side connector AK301378 AB used, remove the special tool, and then connect
the throttle position sensor connector.
1. Connect the MUT-II/III to the diagnosis connector. 7. If a diagnosis code is displayed, erase the
When not using the MUT-II/III, proceed as follows. diagnosis code by using the MUT-II/III or
disconnect the negative battery cable from the
battery terminal and then leave it for at least 10
seconds. After that, reconnect the battery cable,
and then let the engine run at idle for
approximately 10 minutes.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-384 ON-VEHICLE SERVICE

BASIC IDLE SPEED ADJUSTMENT 6. If not within the standard value range, turn the
M1131001800598 speed adjusting screw (SAS) to make the
! CAUTION necessary adjustment.
• The standard idling speed has been adjusted NOTE: If the idling speed is higher than the
by the speed adjusting screw (SAS) by the standard value range even when the SAS is fully
manufacturer, and there should usually be no closed, check whether or not there is any
need for readjustment. indication that the fixed SAS has been moved. If
• If the adjustment has been changed by there is an indication that it has been moved,
mistake, the idle speed may become too high adjust the fixed SAS.
or the idle speed may drop too low when 7. Press the MUT-II/III clear key, and release the ISC
loads from components such as the A/C are servo from the actuator test mode.
placed on the engine. If this occurs, adjust by
the following procedure. NOTE: Unless the ISC servo is released, the
• The adjustment, if made, should be made actuator test mode will continue 27 minutes.
after first confirming that the spark plugs, the 8. Turn the ignition switch to "LOCK" (OFF) position.
injectors, the idle speed control servo, the 9. Disconnect the MUT-II/III.
compression pressure, etc., are all normal. 10.Start the engine again and let it run at idle speed
1. Before inspection and adjustment, set the vehicle for about 10 minutes; check that the idling
to the pre-inspection condition. condition is normal.
2. Connect the MUT-II/III to the diagnosis connector
(16-pin). FUEL PRESSURE TEST
M1131001900517
NOTE: When the MUT-II/III is connected, the 1. Release residual pressure from the fuel pipe line
diagnosis control terminal should be earthed. to prevent fuel gush out (Refer to P.13A-387).
3. Start the engine and run at idle. ! CAUTION
4. Select the item No. 30 of the MUT-II/III actuator Cover the hose connection with rags to prevent
test. splash of fuel that could be caused by some
NOTE: This holds the ISC servo at the basic step residual pressure in the fuel pipe line.
to adjust the basic idle speed.
5. Check the idle speed.
Standard value: 750 ± 50 r/min
NOTE: .
• The engine speed may be 20 to 100 r/min
lower than indicated above for a new vehicle High-pressure
[driven approximately 500 km or less], but no fuel hose
adjustment is necessary.
• If the engine stalls or the engine speed is low
even though the vehicle has been driven AK301382 AB

approximately 500 km or more, it is probable 2. Disconnect the high-pressure fuel hose at the
that deposits are adhered to the throttle valve, delivery pipe side.
so clean it (Refer to P.13A-383).

MB 991637
Speed adjusting
screw Gasket
MD 998709

Delivery
pipe
MD 998742
High-pressure
fuel hose

AKX01458AG
AK301381AB
3. Assemble the fuel pressure measurement tools
as follows.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
ON-VEHICLE SERVICE
13A-385
<When using the fuel pressure gauge set (special 6. Turn the ignition switch to "ON" position (But do
tool)> not start the engine).
a. Remove the union joint and bolt from the special 7. Select "Item No. 07" from the MUT-II/III actuator
tool adaptor hose (MD998709) and attach the test to drive the fuel pump. Check that there are
special tool hose adaptor (MD998742) to the no fuel leaks from any parts.
adaptor hose. 8. Finish the actuator test or turn the ignition switch
b. Via a gasket, install the special tool fuel pressure to "LOCK" (OFF) position.
gauge set (MB991637) into the special tool that 9. Start the engine and run at idle.
has already assembled as described in (a) 10.Fuel pressure measurement while the engine is
above. running at idle.
<When using the fuel pressure gauge> Standard value: Approximately 265 kPa at
a. Remove the union joint and bolt from special tool cerb idle
adaptor hose (MD998709) and attach the special
tool hose adaptor (MD998742) to the adaptor
hose.
b. Via a suitable O-ring or gasket, install the fuel
pressure gauge to the special tool that has Hose
already assembled as described in (a) above.
Fuel pressure
gauge set
O-ring or gasket
MD 998709 AK301383 AB

Delivery 11.Disconnect the vacuum hose from the fuel

pipe
MD 998742 pressure regulator and measure fuel pressure
High-pressure with the hose end closed by a finger.
fuel hose
Standard value: 324 − 343 kPa at cerb idle
AKX01457AF 12.Check to see that fuel pressure at idle does not
4. Install the assembled fuel pressure measurement drop even after the engine has been raced
tools between the fuel rail and high-pressure fuel several times.
hose. 13.Racing the engine repeatedly, hold the fuel return
hose lightly with fingers to feel that fuel pressure
! CAUTION is present in the return hose.
To prevent damage to the MUT-ll/III, always turn
the ignition switch to the "LOCK" (OFF) position NOTE: If the fuel flow rate is low, there will be no
before connecting or disconnecting the MUT-ll/III. fuel pressure in the return hose.
5. Connect the MUT-II/III to the diagnosis connector.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-386 ON-VEHICLE SERVICE

14.If any of fuel pressure measured in steps 10 to 13

is out of specification, troubleshoot and repair
according to the table below.
Symptom Probable cause Remedy
• Fuel pressure too low Clogged fuel filter Replace fuel filter
• Fuel pressure drops after racing Fuel leaking to return side due to Replace fuel pressure regulator
• No fuel pressure in fuel return poor fuel regulator valve seating or
hose settled spring
Low fuel pump delivery pressure Replace fuel pump
Fuel pressure too high Binding valve in fuel pressure Replace fuel pressure regulator
regulator
Clogged fuel return hose or pipe Clean or replace hose or pipe
Same fuel pressure when vacuum Damaged vacuum hose or Replace vacuum hose or clean
hose is connected and when Clogged nipple nipple
disconnected
15.Stop the engine and check change of fuel
pressure gauge reading. Normal if the reading
does not drop within 2 minutes. If it does, observe
the rate of drop and troubleshoot and repair
according to the table below.
Symptom Probable cause Remedy
Fuel pressure drops gradually after Leaky injector Replace injector
engine is stopped Leaky fuel regulator valve seat Replace fuel pressure regulator
Fuel pressure drops sharply Check valve in fuel pump is held Replace fuel pump
immediately after engine is open
stopped
16.Release residual pressure from the fuel pipe line 18.Replace the O-ring at the end of the fuel high
(Refer to P.13A-387). pressure hose with a new one. Furthermore,
! CAUTION apply engine oil to the new O-ring before
Cover the hose connection with rags to prevent replacement.
splash of fuel that could be caused by some 19.Fit the fuel high pressure hose over the delivery
residual pressure in the fuel pipe line. pipe and tighten the bolt to specified toque.
17.Remove the fuel pressure gauge and special tool Tightening torque: 9.0 ± 2.0 N⋅m
from the delivery pipe. 20.Check for any fuel leaks by following the
procedure in step 7.
21.Disconnect the MUT-II/III.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
ON-VEHICLE SERVICE
13A-387
FUEL PUMP CONNECTOR (3) Remove the service hole cover mounting
DISCONNECTION (HOW TO REDUCE screws and remove the service hole cover.
PRESSURIZED FUEL LINES) Fuel tank pump assembly Y0326AU
connector
M1131000900570

! WARNING
When removing the fuel pipe, etc., release
fuel pressure to prevent fuel spray.
1. Remove the rear seat cushion (Refer to GROUP
52A - Rear Seat P.52A-28).
2. Remove the service hole cover mounting screws
and remove the service hole cover.
AC303039 AB
Fuel tank pump assembly Y0326AU
connector
(4) Disconnect the fuel tank pump assembly
connector.
Y0327AU
Fuel tank pump
assembly connector 1 2 3
4 5

AC303039 AB

3. Disconnect the fuel tank pump assembly

connector.
AC303040 AB
4. After starting the engine and letting it run until it
stops naturally, turn the ignition switch to the (5) When the fuel tank pump drive connector is
"LOCK" (OFF) position. attached directly to the battery, check if the
5. Connect the fuel tank pump assembly connector. sound of the fuel tank pump operation can be
6. Tighten the service hole cover mounting screws heard. If no operating sound is heard, replace
and install the service hole cover. the fuel tank pump (Refer to GROUP 13C -
Fuel Tank Pump Assembly Disassembly and
7. Install the rear seat cushion. (Refer to GROUP
Reassembly P.13C-7).
52A - Rear Seat P.52A-28).
NOTE: As the fuel tank pump is an in-tank
FUEL PUMP OPERATION CHECK type, the fuel tank pump sound is hard to hear.
M1131002000614 Remove the fuel tank cap and check from the
1. Check the operating of the fuel tank pump by tank inlet.
MUT-II to force-drive the fuel tank pump. (6) Check for fuel pressure by pinching the fuel
2. If the fuel tank pump will not operate, check by high pressure hose with fingertips.
using the following procedure. If normal, check (7) Connect the fuel tank pump assembly
the fuel tank pump drive circuit. connector.
(1) Turn the ignition switch to the "LOCK" (OFF) (8) Tighten the service hole cover mounting
position. screws and install the service hole cover.
(2) Remove the rear seat cushion (Refer to (9) Install the rear seat cushion. (Refer to GROUP
GROUP 52A - Rear Seat P.52A-28). 52A - Rear Seat P.52A-28).
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-388 ON-VEHICLE SERVICE

COMPONENT LOCATION
M1131002100763

Name Symbol Name Symbol

A/C relay G Fuel pump relay (1) and (2) Q
A/C switch T Idle speed control servo E
Camshaft position sensor N Ignition coil K
Crank angle sensor B Injector C
Detonation sensor I Manifold absolute pressure sensor D
Diagnosis connector S (with intake air temperature sensor)
EGR control solenoid valve H Oxygen sensor (front) J
Engine coolant temperature sensor M Oxygen sensor (rear) P
Engine-ECU <M/T> or U Power steering fluid pressure switch A
Engine-A/T-ECU <A/T> Purge control solenoid valve E
Engine warming lamp R Throttle position sensor D
(check engine lamp) Vehicle speed sensor <M/T> F

A B C D E F G
<L. H. drive vehicles>

Q R S T U

H I J K L M N
<R. H. drive vehicles>

U T S R Q

AK301384 AB
 MULTIPORT FUEL INJECTION (MFI) <4G1>
ON-VEHICLE SERVICE
13A-389
ENGINE CONTROL RELAY CONTINUITY INTAKE AIR TEMPERATURE SENSOR
CHECK CHECK
M1131050000312 M1131002800494

Engine control relay Manifold absolute pressure sensor

Relay box’s
triangle marks

1 2
3 4 1 2 3 4

Equipment side connector AK301385 AB

Equipment side connector AK301387 AB

Tester Battery Voltage Normal State 1. Disconnect the manifold absolute pressure sensor
Connection connector.
Terminal 2. Measure resistance between terminals No. 1 and
2−3 No Voltage Continuity No. 3.
1−4 No Voltage No continuity Standard value:
13 − 17 kΩ (at −20°C)
Voltage (Connect Continuity
5.3 − 6.7 kΩ (at 0°C)
positive (+) terminal of
2.3 − 3.0 kΩ (at 20°C)
battery to terminal No. 3
1.0 − 1.5 kΩ (at 40°C)
and negative (−)
0.56 − 0.76 kΩ (at 60°C)
terminal of battery to
0.30 − 0.42 kΩ (at 80°C)
terminal No. 2.)
3. Remove the manifold absolute pressure sensor
FUEL PUMP RELAY CONTINUITY CHECK Intake air temperature sensor
M1131033000319

Junction block’s
triangle marks
Fuel pump
relay (1)

Fuel pump 1 2
relay (2) 3 4 Manifold absolute
Equipment side pressure sensor
connector AK203066AD

AK301386AB 4. Measure resistance while heating the sensor

using a hair drier.
Tester Battery Voltage Normal Normal condition:
Connection State Temperature (°C) Resistance (kΩ)
Terminal
Higher Smaller
1-4 No Voltage Continuity
5. If the value deviates from the standard value or
2-3 No Voltage No the resistance remains unchanged, replace the
continuity manifold absolute sensor assembly.
Voltage (Connect Continuity 6. Install the manifold absolute sensor and tighten it
positive (+) terminal of to the specified torque.
battery to terminal No. Tightening torque: 5.0 ± 1.0 N⋅m
3 and negative (−)
terminal of battery to
terminal No. 2.)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-390 ON-VEHICLE SERVICE

ENGINE COOLANT TEMPERATURE

SENSOR CHECK
M1131003100476

! CAUTION
Be careful not to touch the connector (resin
section) with the tool when removing and
installing.

Engine coolant AKX01623AD

temperature sensor
4. Apply sealant to threaded portion.
Specified sealant:
3M NUT Locking Part No. 4171 or equivalent
5. Install the engine coolant temperature sensor and
1 2
tighten it to the specified torque.
Equipment side connector AK301388 AB Tightening torque: 29 ± 10 N⋅m
1. Remove the engine coolant temperature sensor.
THROTTLE POSITION SENSOR CHECK
M1131003200525

Throttle position
sensor

1 2 3
AKX01622
Equipment side connector AK301378 AB
2. With temperature sensing portion of engine
coolant temperature sensor immersed in hot 1. Disconnect the throttle position sensor connector.
water, check resistance. 2. Measure the resistance between the throttle
Standard value: position sensor side connector terminal No. 1 and
14 − 17 kΩ (at −20°C) terminal No. 4.
5.1 − 6.5 kΩ (at 0°C) Standard value: 2.0 − 4.0 kΩ
2.1 − 2.7 kΩ (at 20°C) 3. Measure the resistance between the throttle
0.9 − 1.3 kΩ (at 40°C) position sensor side connector terminal No. 2 and
0.48 − 0.68 kΩ (at 60°C) terminal No. 4.
0.26 − 0.36 kΩ (at 80°C)
Normal condition:
3. If the resistance deviates from the standard value Throttle valve slowly Changes smoothly in
greatly, replace the sensor. open until fully open from proportion to the opening
the idle position angle of the throttle valve
4. If the resistance is outside the standard value, or if
it doesn’t change smoothly, replace the throttle
position sensor.
NOTE: For the throttle position sensor adjustment
procedure, refer to P.13A-383.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
ON-VEHICLE SERVICE
13A-391
OXYGEN SENSOR CHECK 6. Connect a digital voltage meter between terminal
M1131005000646 No. 2 (black clip of special tool) and No. 4 (white
Oxygen sensor (front) clip of special tool).
7. While repeatedly racing the engine, measure the
1 2
oxygen sensor output voltage.
3 4 Standard value:
Engine Oxygen Remarks
Equipment side
connector sensor
output
voltage
When 0.6 − 1.0 V If you make the air-fuel
Oxygen sensor
(front) racing the ratio rich by racing the
AK301390 AB engine engine repeatedly, a
1. Disconnect the oxygen sensor connector and normal oxygen sensor
connect the special tool Test harness will output a voltage of
(MD998464) to the connector on the oxygen 0.6 − 1.0 V.
sensor side. ! CAUTION
2. Make sure that there is continuity (4.5 − 8.0 Ω at • Be very careful when connecting the jumper
20°C) between terminal No. 1 (red clip of special wire; incorrect connection can damage the
tool) and No. 3 (blue clip of special tool) on the oxygen sensor.
oxygen sensor connector. • Be careful the heater is broken when voltage
3. If there is no continuity, replace the oxygen of beyond 8V is applied to the oxygen sensor
sensor. heater.
4. Warm up the engine until engine coolant is 80°C NOTE: If the sufficiently high temperature (of
or higher. approximate 400°C or more) is not reached
although the oxygen sensor is normal, the output
voltage would be possibly low although the rich
air-fuel ratio. Therefore, if the output voltage is
Oxygen low, use a jumper wire to connect the terminal
Black sensor
equipment No.1 (red clip of special tool) and the terminal No.
side connector 3 (blue clip of special tool) of the oxygen sensor
White with a (+) terminal and (-) terminal of 8 V power
supply respectively, then check again.
8. If the sensor is defective, replace the oxygen
MD998464
AKX01624 AF sensor.
NOTE: For removal and installation of the oxygen
5. Perform a tracing for 5 minutes or more with the sensor, refer to GROUP 15 − Exhaust Manifold.
engine speed of 4,500 r/min. P.15-8.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-392 ON-VEHICLE SERVICE

Oxygen sensor (rear) 5. Use a jumper wire to connect terminal No. 2 of the
oxygen sensor connector to the battery (+)
terminal and terminal No. 1 to the battery (−)
Oxygen sensor
terminal.
(rear) 6. Connect a digital voltage meter between terminal
No. 3 and terminal No. 4.
7. While repeatedly racing the engine, measure the
oxygen sensor output voltage.
Standard value:
Engine Oxygen Remarks
sensor
output
voltage
Oxygen sensor When 0.6 − 1.0 V If you make the air/fuel
(rear) connector racing the ratio rich by racing the
engine engine repeatedly, a
normal oxygen sensor
will output a voltage of
4 2
1 3 3
2 4
1
0.6 − 1.0 V.
Equipment side connector AK301391 AB ! CAUTION
• Be very careful when connecting the jumper
1. Disconnect the oxygen sensor connector and wire; incorrect connection can damage the
connect the special tool Test harness (MB991658) oxygen sensor.
to the connector on the oxygen sensor side. • Be careful the heater is broken when voltage
2. Make sure that there is continuity (4.5 − 8.0 Ω at of beyond 12V is applied to the oxygen
20°C) between terminal No. 1 and terminal No. 3 sensor heater.
on the oxygen sensor connector. NOTE: If the sufficiently high temperature (of
3. If there is no continuity, replace the oxygen approximate 400°C or more) is not reached
sensor. although the oxygen sensor is normal, the output
4. Warm up the engine until engine coolant is 80°C voltage would be possibly low although the rich
or higher. air-fuel ratio. Therefore, if the output voltage is
low, use a jumper wire to connect the terminal
No.1 (red clip of special tool) and the terminal No.
Oxygen sensor 3 (blue clip of special tool) of the oxygen sensor
with a (+) terminal and (-) terminal of 12 V power
supply respectively, then check again.
8. If the sensor is defective, replace the oxygen
sensor.
NOTE: For removal and installation of the oxygen
sensor, refer to GROUP 15 − Exhaust Pipe and
MB991658 Main Muffler P.15-11.
AK000121 AC
 MULTIPORT FUEL INJECTION (MFI) <4G1>
ON-VEHICLE SERVICE
13A-393
INJECTOR CHECK Fuel pressure
M1131005200468 regulator
Check the Operation Sound
MD998741
High-pressure
fuel hose MD998706
Injector MB991607 Return hose

MB991976

Battery Injector
AK301464 AC

AK301393AB 4. Connect the MUT-II/III to the diagnosis connector.

5. Turn the ignition switch to "ON" position (But do
1. Use a stethoscope to listen to the operation sound not start the engine).
(clicking) of the injectors while the engine is idling 6. Select "Item No. 07" from the MUT-II/III actuator
or cranking. test to drive the fuel pump.
! CAUTION
Beware that the operation sounds of other Fuel pressure
regulator
injectors can be heard even if the injector that is
being inspected might not be operating.
2. Verify that the operation sound increases with the High-pressure
engine speed. fuel hose
NOTE: If the operating sound cannot be heard, Return hose
inspect the injector actuation circuit.

Measurement of Resistance between Injector

Terminals Battery
AK301465AC
1. Disconnect the injector connector.
2. Measure the resistance between terminals. 7. Activate the injector and check the atomized
Standard value: 13 − 16 Ω (at 20°C) spray condition of the fuel.
3. Connect the injector connector. The condition can be considered satisfactory
unless it is extremely poor.
Check the Injection Condition 8. Stop the actuation of the injector, and check for
1. Following the steps below, bleed out the residual leakage from the injector’s nozzle.
pressure within the fuel pipe line to prevent flow of Standard value: 1 drop or less per minute
the fuel (Refer to P.13A-387). 9. Activate the injector without activating the fuel
2. Remove the injector. pump; then, when the spray emission of fuel from
3. Assemble the following special tools as shown in the injector stops, disconnect the special tool and
Fig. restore it to its original condition.
• Injector test set (MD998706) 10.Disconnect the MUT-II/III.
• Injector test harness (MB991607)
• Injector test adaptor (MD998741)
• Injector test holder assembly (MB991976)
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-394 ON-VEHICLE SERVICE

IDLE SPEED CONTROL (ISC) SERVO Check the Coil Resistance

(STEPPER MOTOR) CHECK
M1131005400547

Check the Operation Sound

Idle speed
control servo

1 2 3
4 5 6
1 2 3
4 5 6
Equipment side connector AK301392 AB

1. Check that the engine coolant temperature is 1 2 3

20°C or below. 4 5 6
NOTE: Disconnecting the engine coolant
temperature sensor connector and connecting the
harness-side of the connector to another engine
coolant temperature sensor that is at 20°C or
below is also okay.
AKX01561AE
2. Check that the operation sound of the stepper
motor can be heard after the ignition is turned to 1. Disconnect the idle speed control servo
the "ON" position (but without starting the engine). connector.
3. If the operation sound cannot be heard, check the 2. Measure the resistance between terminal No. 2
stepper motor’s activation circuit. and either terminal No. 1 or terminal No. 3 of the
If the circuit is normal, it is probable that there is a connector at the idle speed control servo side.
malfunction of the stepper motor or of the Standard value: 28 − 33 Ω (at 20°C)
engine-ECU<M/T> or engine-A/T-ECU<A/T> . 3. Measure the resistance between terminal No. 5
and either terminal No. 6 or terminal No. 4 of the
connector at the idle speed control servo side.
Standard value: 28 − 33 Ω (at 20°C)
4. If the resistance deviates from the standard value
greatly, replace the idle speed control servo.

Operation Check

AKX01626

1. Remove the throttle body.

2. Remove the stepper motor.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
ON-VEHICLE SERVICE
13A-395
3. Connect the special tool Test harness (2) Connect the negative (−) terminal of the power
(MB991709) to the idle speed control servo supply to the terminal No. 3 and terminal No.
connector. 4.
4. Connect the positive (+) terminal of a power (3) Connect the negative (−) terminal of the power
supply (approximately 6 V) to the terminals No. 2 supply to the terminal No. 3 and terminal No.
and No. 5. 6.
5. With the idle speed control servo as shown in the (4) Connect the negative (−) terminal of the power
illustration, connect the negative (−) terminal of supply to the terminal No. 1 and terminal No.
the power supply to each clip as described in the 6.
following steps, and check whether or not a (5) Connect the negative (−) terminal of the power
vibrating feeling (a feeling of very slight vibration supply to the terminal No. 1 and terminal No.
of the stepper motor) is generated as a result of 4.
the activation of the stepper motor. (6) Repeat the tests in sequence from (5) to (1).
(1) Connect the negative (−) terminal of the power 6. If vibration is detected during the test, the stepper
supply to the terminal No. 1 and terminal No. motor can be considered to be normal.
4.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-396 INJECTOR

INJECTOR
REMOVAL AND INSTALLATION
M1131007100702

Pre-removal Operation Post-installation Operation

• Fuel Discharge Prevention (Refer to P.13A-387). • Air Cleaner Body and Air Cleaner To Throttle Body Duct
• Air Cleaner Body and Air Cleaner To Throttle Body Duct Installation (Refer to GROUP 15 P.15-2).
Removal (Refer to GROUP 15 P.15-2). • Accelerator Cable Adjustment (Refer to GROUP 17 -
On-vehicle Service P.17-2).
• Fuel Leakage Inspection

2
5.0 ± 1.0 N·m

5 11 ± 1 N·m
9.0 ± 2.0 N·m 9 5.0 ± 1.0 N·m
8 17
4
13 N
7 12
10
7
3 22 14
12 ± 1 N·m
N 11
6 19 N
20 N 18

21
16

1
15

Apply new engine oil

to all O-rings before
installation.
AC207591AC

Removal steps Removal steps (Continued)

1. Rocker cover PCV hose 9. Fuel return line hose connection
2. Accelerator cable connection >>A<< 10. MPI delivery pipe pressure
3. Engine control detonation sensor regulator
connector >>A<< 11. Fuel regulator O-ring
4. Emission solenoid valve (EGR >>A<< 12. Fuel high-pressure hose
system) connector connection
5. Inlet manifold absolute pressure >>A<< 13. Fuel line O-ring
sensor connector <<A>> 14. Fuel delivery pipe and fuel injector
6. Fuel injector connector assembly
7. Control wiring harness clamp 15. Fuel injector insulator
connection 16. Fuel injector insulator
8. Emission control equip hose 17. Fuel injector harness support
connection bracket
 MULTIPORT FUEL INJECTION (MFI) <4G1>
INJECTOR
13A-397
Removal steps (Continued)
>>A<< 18. Fuel injector assembly
>>A<< 19. Fuel injector O-ring
20. Fuel injector sheet
21. Fuel injector
22. Fuel delivery pipe

REMOVAL SERVICE POINT 2. Turn the fuel injectors assembly. To the right and
<<A>> FUEL DELIVERY PIPE AND FUEL left to install to the fuel delivery pipe. Repeat for
INJECTOR ASSEMBLY REMOVAL MPI delivery pipe pressure regulator and fuel
high-pressure hose. Be careful not to damage the
! CAUTION O-ring. After installing, check that the item turns
Do not drop the fuel injector. smoothly.
Remove the fuel delivery pipe with the fuel injectors
3. If it dose not turn smoothly, the O-ring may be
assembly attached to it.
trapped, remove the item, re-install it into the fuel
delivery pipe and check again.
INSTALLATION SERVICE POINT 4. Tighten the MPI delivery pipe pressure regulator
>>A<< FUEL INJECTOR O-RING/FUEL INJECTOR and fuel high-pressure hose to the specified
ASSEMBLY/FUEL LINE O-RING/FUEL torque.
HIGH-PRESSURE HOSE/FUEL REGULATOR Tightening torque:
O-RING/MPI DELIVERY PIPE PRESSURE 9.0 ± 2.0 N⋅m <MPI delivery pipe pressure
REGULATOR INSTALLATION regulator>
! CAUTION 5.0 ± 1.0 N⋅m <Fuel high-pressure hose>
Do not let the engine oil get into the fuel delivery
pipe will be damaged.
1. Apply a drop of new engine oil to the O-rings.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-398 THROTTLE BODY ASSEMBLY

THROTTLE BODY ASSEMBLY

REMOVAL AND INSTALLATION
M1131007700588

Pre-removal Operation Post-installation Operation

• Engine Coolant Draining (Refer to GROUP 14 - • Air Cleaner To Throttle Body Duct Installation (Refer to
On-vehicle Service P.14-22). GROUP 15 - Air Cleaner P.15-2).
• Air Cleaner To Throttle Body Duct Removal (Refer to • Engine Coolant Supplying (Refer to GROUP 14 -
GROUP 15 - Air Cleaner P.15-2). On-vehicle Service P.14-22).
• Accelerator Cable Adjustment (Refer to GROUP 17 -
On-vehicle Service P.17-2).

19 ± 3 N·m
2
1
5.0 ± 1.0 N·m 6

3
N 8
7

5 4

AC207582 AC
Removal steps Removal steps (Continued)
1. Accelerator cable connection 5. Throttle body water return hose
2. Throttle body throttle sensor connection
connector 6. Emission vacuum hose
3. Throttle body idle speed control connection
servo connector 7. Throttle body assembly
4. Throttle body water feed hose >>A<< 8. Throttle body gasket
connection

INSTALLATION SERVICE POINT Up

>>A<< THROTTLE BODY GASKET
INSTALLATION
! CAUTION
Poor idling etc. may result if the throttle body
gasket is installed incorrectly.

Towards front of vehicle AC207586 AC

Install the throttle body gasket as shown in the

illustration.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
THROTTLE BODY ASSEMBLY
13A-399
THROTTLE BODY ASSEMBLY
DISASSEMBLY AND REASSEMBLY
M1131009700540

1
4
2.0 ± 0.3 N·m

5
6

7
11 ± 1 N·m
3

2
2.0 ± 0.3 N·m

AK201861AC

Removal steps Removal steps (Continued)

>>A<< 1. Throttle position sensor 6. Fixed sas
2. Idle speed control servo 7. Harness bracket
3. O-ring 8. Throttle body
4. Speed adjusting screw
5. O-ring
 MULTIPORT FUEL INJECTION (MFI) <4G1>
13A-400 THROTTLE BODY ASSEMBLY

REASSEMBLY SERVICE POINT

>>A<< THROTTLE POSITION SENSOR (TPS)
Throttle position Throttle position sensor
INSTALLATION sensor output power supply

1 2 3

Earth

AK201870 AC

3. Connect a multimeter between terminal 3 (throttle

position sensor power supply) and terminal 1
AK201869AC (throttle position sensor output) of the throttle
1. Install the throttle position sensor to the throttle position sensor connector, and check that the
body as shown in the illustration. resistance increases gradually as the throttle
valve is opened slowly to the fully-open position.
2. Turn the throttle position sensor 90 degrees
counterclockwise to set it, and tighten the screws. THROTTLE VALVE CONTINUITY
POSITION
Fully closed Continuity
Fully open No Continuity
4. If there is no continuity when the throttle valve is
fully closed, turn the throttle position sensor body
anti-clockwise and then check again.
5. If there is an abnormality, replace the throttle
position sensor.
 MULTIPORT FUEL INJECTION (MFI) <4G1>
ENGINE ECU AND ENGINE-A/T-ECU
13A-401
ENGINE ECU AND ENGINE-A/T-ECU
REMOVAL AND INSTALLATION
M1131022500019

Pre-removal and Post-installation Operation

Globe Box and Harness Cover Removal and Installation
(Refer to GROUP 52A - Instrument Panel Assembly
P.52A-2).

5.0 ± 1.0 N·m

AC303053 AB

REMOVAL STEPS
1. Engine-ECU connector <M/T> or
Engine-A/T-ECU connector <A/T>
2. Engine-ECU <M/T> or
Engine-A/T-ECU <A/T>
127(6