05−7

DIAGNOSTICS − SFI SYSTEM (1GR−FE)

05BSB−01

PRE−CHECK
1. DIAGNOSIS SYSTEM
(a) Description for Euro−OBD (European spec.)
S When troubleshooting Euro−OBD vehicles, the
only difference from the usual troubleshooting pro-
cedure is that you connect an OBD scan tool com-
plying with ISO 15031−4 or a hand−held tester to
the vehicle, and read off various data output from
FI2547
the vehicle’s ECM.
S Euro−OBD regulations require that the vehicle’s
on−board computer illuminates the check engine
warning light (CHK ENG) on the instrument panel
when the computer detects a malfunction in the
emission control system / components or in the
power train control components which affect vehicle
emissions, or a malfunction in the computer. In addi-
tion to an illumination of the CHK ENG when a mal-
f unct ion is det ect ed, t he applicable Diagnost ic
Trouble Codes (DTCs) prescribed by ISO 15031−4
ar e r ecor ded in t he ECM m em or y ( See page
05−22). If the malfunction does not reoccur in 3 con-
secutive trips, the CHK ENG goes off automatically
but the DTCs remain recorded in the ECM memory.

S To check the DTCs, connect the OBD scan tool or

Hand−Held Tester hand−held tester to Data Link Connector 3 (DLC3)
on the vehicle. The OBD scan tool or hand−held
tester also enables you to erase the DTCs and
check freezed frame data and various forms of en-
gine data. (For operating instructions, see the OBD
scan tool’s instruction book.)
DLC3 DTCs include ISO controlled codes and manufac-
A72434 turer controlled codes. ISO controlled codes must
be set as prescribed by the ISO, while manufacturer
controlled codes can be set freely by the manufac-
turer within the prescribed limits (See DTC chart on
page 05−22).
S The diagnosis system operates in the normal mode
during normal vehicle use. It also has a check (test)
mode for technicians to simulate malfunction symp-
toms and troubleshoot. Most DTCs use 2 trip detec-
tion logic* to prevent erroneous detection, and to
ensure a thorough malfunction detection. By
switching the ECM to the check (test) mode using
hand−held tester when troubleshooting, a techni-
cian can cause the CHK ENG to illuminate for a mal-
function that is only detected once or momentarily
(Hand−held tester only) (See step 3).

LAND CRUISER PRADO Supplement (RM1017E)

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

S * 2 trip detection logic

When a logic malfunction is first detected, the mal-
function is temporally stored in the ECM memory
(1st trip). If the same malfunction is detected again
during the second drive test, this second detection
causes the CHK ENG to illuminate (2nd trip) (How-
ever, the ignition switch must be turned OFF be-
tween the 1st trip and 2nd trip).
S Freeze frame data:
Freeze frame data records the engine condition
when a misfire (DTCs P0300 − P0306) or fuel trim
malfunction (DTCs P0171, P0172, P0174 and
P0175) or other malfunction (first malfunction only)
is detected.
Because freeze frame data records the engine
conditions (fuel system, calculated load, engine
coolant temperature, fuel trim, engine speed, ve-
hicle speed, etc.) when the malfunction is detected,
when troubleshooting it is useful for determining
whether the vehicle was running or stopped, the en-
gine warmed up or not, the air−fuel ratio lean or rich,
etc. at the time of the malfunction.
S Priorities for troubleshooting:
If troubleshooting priorities for multiple DTCs are
given in the applicable DTC chart, these should be
followed.
If no instructions are given, troubleshoot according to the fol-
lowing priorities.
(1) DTCs other than fuel trim malfunction (DTCs
P0171, P0172, P0174 and P0175) and misfire
(DTCs P0300 − P0306).
(2) Fuel trim malfunction (DTCs P0171, P0172, P0174
and P0175).
(3) Misfire (DTCs P0300 − P0306).

(b) Description for M−OBD (Except European spec.)

S When troubleshoot Multiplex OBD (M−OBD) ve-
hicles, the only difference from the usual trouble-
shooting procedure is that you connect the hand−
held tester to the vehicle, and read off various data
output from the vehicle’s ECM.

FI2547

LAND CRUISER PRADO Supplement (RM1017E)

 05−9
DIAGNOSTICS − SFI SYSTEM (1GR−FE)

S The vehicle’s on−board computer illuminates the

check engine war ning light ( CHK ENG ) on t he
instrument panel when the computer detects a mal-
function in the computer itself or in drive system
components. In addition to an illumination of the
CHK ENG when a malfunction is detected, the ap-
plicable Diagnostic Trouble Codes (DTCs) are re-
corded in the ECM memory (See page 05−22). If
the malfunction does not recur, the CHK ENG lamp
will be disappeared by turning off the ignition switch
but the recorded DTC will be remaining in the ECM
memory.

S To check the DTCs, connect the hand−held tester

Hand−Held Tester to the Data Link Connector 3 (DLC3) on the vehicle
or read the DTC which is indicated on the multi in-
formation display when TC and CG terminals on the
DLC3 are connected. The hand−held tester also
enables you to erase the DTCs and check the
freeze frame data and various forms of engine data.
DLC3 (for operating instructions, see the instruction
A72434 book.)
S The diagnosis system operates in the normal mode
during normal vehicle use. It also has a check (test)
mode for technicians to simulate malfunction symp-
toms and troubleshoot. Most DTCs use 2 trip detec-
tion logic* to prevent erroneous detection, and to
ensure a thorough malfunction detection. By
switching the ECM to the check (test) mode using
hand−held tester when troubleshooting, a techni-
cian can cause the CHK ENG to illuminate for a mal-
function that is only detected once or momentarily
(Hand−held tester only) (See step 3).
S * 2 trip detection logic
When a logic malfunction is first detected, the mal-
function is temporally stored in the ECM memory
(1st trip). If the same malfunction is detected again
during the second drive test, this second detection
causes the CHK ENG to illuminate (2nd trip) (How-
ever, the ignition switch must be turned OFF be-
tween the 1st trip and 2nd trip).

LAND CRUISER PRADO Supplement (RM1017E)

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

S Freeze frame data:

Freeze frame data records the engine conditions
(fuel system, calculator load, water temperature,
fuel trim, engine speed, vehicle speed, etc.) when
a malfunction is detected. When troubleshooting,
it is useful for determining whether the vehicle was
running or stopped, the engine was warmed up or
not, the air−fuel ratio was lean or rich, etc. at the
time of the malfunction.

(c) Check the DLC3.

The vehicle’s ECM uses the ISO 9141−2 (Euro−OBD)/
ISO 14230(M−OBD) communication protocol. The termi-
1 23 4 5 6 78 nal arrangement of the DLC3 complies with ISO
15031−03 and matches the ISO 9141−2/ ISO 14230 for-
9 10111213141516
mat.
DLC3

A04550

Symbol Terminal No. Connection/Voltage or Resistance Condition

SIL 7 Bus + Line/Pulse generation During transmission
CG 4 Chassis Ground − Body Ground/1 W or less Always
SG 5 Signal Ground − Body Ground/1 W or less Always
BAT 16 Battery Positive − Body Ground/9 to 14 V Always
HINT:
If the display shows ”UNABLE TO CONNECT TO VEHICLE”
when you have connected the cable of the hand−held tester to
the DLC3, turned the ignition switch ON and operated the
hand−held tester, there is a problem on the vehicle side or tool
side.
S If communication is normal when the tool is connected to
another vehicle, inspect the DLC3 on the original vehicle.
S If communication is still not possible is when the tool is
connected to another vehicle, the problem is probably in
the tool itself, so consult the Service Deparment listed in
the tool’s instruction manual.
(d) Inspect the battery voltage.
Battery voltage: 11 to 14 V
If voltage is below 11 V, recharge the battery before proceeding.
(e) Check the CHK ENG.
(1) The CHK ENG lamp comes on when the ignition
switch is turned ON and the engine is not running.
HINT:
If the CHK ENG does not illuminate, troubleshoot the combina-
tion meter.
(2) When the engine is started, the CHK ENG should
go off. If the lamp remains on, it means that the diag-
nosis system has detected a malfunction or ab-
normality in the system.
LAND CRUISER PRADO Supplement (RM1017E)
 05−11
DIAGNOSTICS − SFI SYSTEM (1GR−FE)

2. Normal Mode:
DTC CHECK
NOTICE:
Hand−held tester only:
When the diagnosis system is switched from the normal
mode to the check (test) mode, it erases all DTCs and freeze
frame data recorded in the normal mode. So before switch-
ing modes, always check the DTCs and freeze frame data,
and note them down.

(a) Checking DTCs using the hand−held tester.

(1) Connect the hand−held tester to the DLC3.
(2) Turn the ignition switch ON and switch the hand−
held tester main switch ON.
(3) Use the hand−held tester to check the DTCs and
freeze frame data and note them down (for operat-
ing instructions, see the hand−held tester’s instruc-
tion book).
A72434 (4) See page 05−22 to confirm the details of the
DTCs.
(b) If you have no hand−held tester, perform the following
TC step (1) to (6).
(1) Turn the ignition switch ON.
(2) Using SST, connect between terminals 13 (TC) and
4 (CG) of the DLC3.
SST 09843 − 18040

CG
A04438

(3) Read DTC by observing the CHK ENG lamp. If any

0.25sec. DTC is not detected, the CHK ENG blinks as shown
in the illustration.
ON ON ON ON

OFF OFF OFF

0.25sec.

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

0.5 sec. 1.5 sec. (4) Example

If DTC 12 and 31 are detected, the CHK ENG
4.5 sec. 4.5 sec.
flashes 1 time (for 0.5 sec) and flashes 2 times after
2.5 the 1.5 sec interval, then, flashes 3 times after a 2.5
ON sec. sec interval from the previous DTC and flashes 1
OFF
0.5 sec. time.
Repeat
If the interval between the previous DTC and the
One Cycle next DTC is 4.5 sec, it means the previous DTC is
Start the last one of the multiple string DTCs. The CHK
BR3589

ENG lamp repeats the indication of DTCs from the

initial cycle. (Refer to the illustration on the left)
(5) Check the details of the malfunction using the DTC
chart on page 05−22.
(6) After completing the check, disconnect terminals 13
(TC) and 4 (CG) and turn off the display.
HINT:
In the event that 2 or more DTCs are detected, the CHK ENG
lamp will indicate the smaller number DTC first.
(c) Clearing the DTCs using the hand−held tester.
(1) Connect the hand−held tester to the DLC3.
(2) Turn the ignition switch ON.
(3) When operating the hand−held tester to erase the
codes, the DTCs and freeze frame data will be
erased. (See the hand−held tester’s instruction
book for operating instructions.)
(d) Clearing the DTCs not using the hand−held tester.
(1) Disconnecting the battery terminal or remove the
EFI and ETCS fuses from the engine room R/B
more than 60 seconds.
3. Check (Test) Mode:
DTC CHECK
HINT:
Hand−held tester only:
Compared to the normal mode, the check mode has more sens-
ing ability to detect malfunctions.
Furthermore, the same diagnostic items which are detected in
the normal mode can also be detected in the check (test) mode.
(a) Procedure for check mode using the hand−held tester.
(1) Check the initial conditions
S Battery positive voltage 11 V or more.
S Throttle valve fully closed.
S Transmission in the ”P” or ”N” position.
S Air conditioning switched OFF.
(2) Turn the ignition switch OFF.
(3) Connect the hand−held tester to the DLC3.
(4) Turn the ignition switch ON and switch the hand−
held tester main switch ON.

LAND CRUISER PRADO Supplement (RM1017E)

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

(5) Switch the hand−held tester from the normal mode

to the check (test) mode. The CHK ENG blinks in
0.13 sec. 0.13 sec intervals as shown in the illustration.
ON NOTICE:
If the hand−held tester switches the ECM from the normal
mode to the check mode or vice−versa, or if the ignition
OFF switch is turned from ON to ACC or OFF during the check
0.13 sec. mode, the DTC and freeze frame data will be erased.
A76900 (6) Start the engine. (The CHK ENG goes off after the
engine start.)
(7) Simulate the conditions of the malfunction de-
scribed by the customer.
NOTICE:
Leave the ignition switch ON until you have checked the
DTC, etc.
(8) After simulating the malfunction conditions, use the
hand−held tester diagnosis selector to check the
DTCs and freeze frame data, etc.
HINT:
Be sure not to turn the ignition switch OFF, because the diag-
nosis system is changed from the check mode to the normal
mode and will result in all of the DTCs and freeze frame data
being erased.
(9) After checking the DTC, inspect the applicable cir-
cuit.
(b) Clearing the DTCs using the hand−held tester.
(1) Connect the hand−held tester to the DLC3.
(2) Turn the ignition switch ON.
(3) When operating the hand−held tester to erase the
codes, the DTCs and freeze frame data will be
erased. (See the hand−held tester’s instruction
book for operating instructions.)
(c) Clearing the DTCs not using the hand−held tester.
(1) Disconnecting the battery terminal or remove the
EFI and ETCS fuses from the engine room R/B
more than 60 seconds.

LAND CRUISER PRADO Supplement (RM1017E)

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

4. FAIL−SAFE CHART
If any of the following codes are recorded, the ECM enters the fail−safe mode.
DTC No. Fail−Safe Operation Fail−Safe Deactivation Conditions
P0031/28
P0032/28
P0037
P0038 The heater circuit in which the abnormality is detected is
Ignition switch OFF
P0051/21 turned off
P0052/21
P0057
P0058
P0100/31
Ignition timing is calculated from engine speed and a throttle
P0102/31 Returned to normal condition
angle
P0103/31
P0110/24
P0112/24 Intake air temp. is fixed at 20˚C (68˚F) Returned to normal condition
P0113/24
P0115/22
P0117/22 Engine coolant temp. is fixed at 80˚C (176˚F) Returned to normal condition
P0118/22
P0120/41
P0122/41
P0123/41
P0220/41 Fuel cut intermittently when idle Returned to normal condition and ignition switch OFF
P0222/41
P0223/41
P2135/41
P0121/41 Fuel cut intermittently when idle Returned to normal condition and ignition switch OFF
P0325/55
P0327/55
P0328/55
Max. timing retardation Ignition switch OFF
P0330/52
P0332/52
P0333/52
P0351/14
P0352/15
P0353/15
Fuel cut Returned to normal condition
P0354/14
P0355/14
P0356/15
P2102/41
Fuel cut intermittently when idle
P2103/41
P2111/41 Returned to normal condition and ignition switch OFF
Fuel cut intermittently when idle
P2112/41
P2119/89 Fuel cut intermittently when idle
5. CHECK FOR INTERMITTENT PROBLEMS
Hand−held tester only:
By putting the vehicle’s ECM in the check mode, the 1 trip detection logic is possible instead of the 2 trip
detection logic, and the sensitivity to detect faults is increased. This makes it easier to detect intermittent
problems.
(1) Clear the DTCs (See step 2).
(2) Set the check mode (See step 3).
(3) Perform a simulation test (See page 01−25).
(4) Check the connector and terminal (See page 01−35).
(5) Handle the connector (See page 01−35).

LAND CRUISER PRADO Supplement (RM1017E)

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

6. DATA LIST
HINT:
According to the DATA LIST displayed by the hand−held tester, you can read the value of the switch, sensor,
actuator and so on without parts removal. Reading the DATA LIST as a first step of troubleshooting is one
of the methods to shorten the diagnostic time.
NOTICE:
The values given below for ”Normal Condition” are representative values. So, a vehicle may still be
normal even if its value differs from those listed here. Do not solely depend on the ”Normal Condi-
tion” here when deciding whether a part is faulty or not.
(a) Warm up the engine.
(b) Turn the ignition switch OFF.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch ON.
(e) Push the ”ON” button of the hand−held tester.
(f) Select the item ”DIAGNOSIS / OBD/MOBD / DATA LIST”.
(g) According to the display on tester, read the ”DATA LIST”.
Measurement Item/Range
Hand−held Tester Display Normal Condition *1 Diagnostic Note
(Display)
Injection period of the No. 1 cylin-
INJECTOR der/ Idling: 1.6 to 2.4 ms ¾
Min.: 0 ms, Max.: 32.64 ms
Ignition timing advance for No. 1
IGN ADVANCE cylinder/ Idling: BTDC 7 to 24˚ ¾
Min.: −64 deg., Max.: 63.5 deg.
S Idling: 11.4 to 16.4 %
Calculated load by ECM/
CALC LOAD S Racing without load (2,500 rpm): ¾
Min.: 0 %, Max.: 100 %
13.1 to 18.9 %
If the value is Approximately 0.0
gm/s:
S Idling: 3.2 to 4.7 gm/s S Mass air flow meter power
Air flow rate from MAF sensor/
MAF S Racing without load (2,500 rpm): source circuit open
Min.: 0 gm/s, Max.: 655 gm/s
13.1 to 18.9 gm/s S VG circuit open or short
Or if it is 160.0 gm/s or more:
S E2G circuit open
Engine speed/
ENGINE SPD Idling: 650 to 750 rpm ¾
Min.: 0 rpm, Max.: 16383 rpm
Coolant temperature/ After warming up: 80 to 95˚C (176 S If the value is −40_C (−40_F):
COOLANT TEMP
Min.: −40 _C, Max.: 140 _C to 203˚F) sensor circuit is open.
Intake air temperature/ S Or if it is 140_C (284_F): sensor
INTAKE AIR Equivalent to Ambient Temp. circuit is shorted.
Min.: −40 _C, Max.: 140 _C
Absolute throttle position sensor/ S Throttle fully closed: 10 to 24 % Read the value when the ignition
THROTTLE POS
Min.: 0 %, Max.: 100 % S Throttle fully open: 64 to 96 % switch is ON (Do not start engine).
Closed throttle position switch/ S Throttle fully closed: ON
CTP SW ¾
ON or OFF S Throttle open: OFF

Vehicle speed/
VEHICLE SPD Actual vehicle speed Speed indicated on speedometer
Min.: 0 km/h, Max.: 255 km/h
S Accelerator pedal released:
Accelerator pedal position sensor
0.5 to 1.1 V Read the value when the ignition
ACCEL POS #1 No.1 output voltage/
S Accelerator pedal depressed: switch is ON (Do not start engine).
Min.: 0 V, Max.: 5 V
2.6 to 4.5 V

S Accelerator pedal released:

Accelerator pedal position sensor
1.2 to 2.0 V Read the value when the ignition
ACCEL POS #2 No.2 output voltage/
S Accelerator pedal depressed: switch is ON (Do not start engine).
Min.: 0 V, Max.: 5 V
3.4 to 5.3 V

LAND CRUISER PRADO Supplement (RM1017E)

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

Measurement Item/Range
Hand−held Tester Display Normal Condition *1 Diagnostic Note
(Display)

Throttle position sensor No.2 out- S Throttle fully closed: 2.1 to 3.1 V Read the value when the ignition
THROTTLE POS #2
put voltage/ Min.: 0 V, Max.: 5 V S Throttle fully open: 4.5 to 5.5 V switch is ON (Do not start engine).
Target position of throttle valve/
THROTTLE TARGT Idling: 0.4 to 1.1 V ¾
Min.: 0 V, Max.: 5 V

S When the accelerator pedal is

depressed, duty ratio is in-
Throttle motor opening duty ratio/ creased.
THROTTLE OPN DUTY Throttle fully closed: 0 %
Min.: 0 %, Max.: 100 % S Read the value when the ignition
switch is ON (Do not start the en-
gine)
S When the accelerator pedal is re-
leased quickly, duty ratio is in-
Throttle motor closed duty ratio/ creased.
THROTTLE CLS DUTY Throttle fully closed: 0 %
Min.: 0 %, Max.: 100 % S Read the value when the ignition
switch is ON (Do not start the en-
gine)
Whether or not throttle motor con-
THROTTLE MOT Idling: ON ¾
trol is permitted/ ON or OFF
Whether or not electric throttle
+BM control system power is inputted/ Idling: ON ¾
ON or OFF
Whether or not accelerator pedal
ACCEL IDL POS position sensor is detecting idle/ Idling: ON ¾
ON or OFF
Whether or not throttle position
THROTTLE IDL POS sensor is detecting idle/ Idling: ON ¾
ON or OFF
Whether or not fail safe function is
FAIL #1 ETCS has failed: ON ¾
executed/ ON or OFF
Whether or not fail safe function is
FAIL #2 ETCS has failed: ON ¾
executed/ ON or OFF

Throttle fully closed learning value

THROTTLE INITIAL 0.5 to 0.9 V ¾
Min.: 0 V, Max.: 5 V
Accelerator fully closed learning
ACCEL LEARN VAL value 0.4 to 0.8 V ¾
Min.: 0 V, Max.: 5 V
Throttle motor current
THROTTLE MOT Idling: 0 to 3.0 A ¾
Min.: 0 A, Max.: 20 A
Heated oxygen sensor output volt-
Driving (50 km/h, 31 mph):
O2S B1 S2 age of the bank 1 sensor 2/
0.1 to 0.9 V
Min.: 0 V, Max.: 1.275 V
Heated oxygen sensor output volt-
Driving (50 km/h, 31 mph):
O2S B2 S2 age of the bank 2 sensor 2/ Performing the INJ VOL or A/F
0.1 to 0.9 V
Min.: 0 V, Max.: 1.275 V CONTROL of the ACTIVE TEST
A/F sensor output voltage of the enables the user to check the volt-
AFS B1 S1 bank 1 sensor 1/ Idling 2.8 to 3.8 V age output of each sensor.
Min.: 0 V, Max.: 7.999 V
A/F sensor output voltage of the
AFS B2 S1 bank 2 sensor 1/ Idling 2.8 to 3.8 V
Min.: 0 V, Max.: 7.999 V
This item is the short−term fuel
Short term fuel trim of bank 1/ compensation used to maintain the
SHORT FT #1 0 ± 20 %
Min.: −100 %, Max.: 100% air−fuel ratio at stoichiometric air−
fuel ratio

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

Measurement Item/Range
Hand−held Tester Display Normal Condition *1 Diagnostic Note
(Display)

This item is the overall fuel com-

pensation carried out in long−term
Long term fuel trim of bank 1/
LONG FT #1 0 ± 20 % to compensate for a continual
Min.: −100 %, Max.: 100 %
deviation of the short−term fuel
trim from the central value.
This item is the short−term fuel
Short term fuel trim of bank 2/ compensation used to maintain the
SHORT FT #2 0 ± 20 %
Min.: −100 %, Max.: 100 % air−fuel ratio at stoichiometric air−
fuel ratio

This item is the overall fuel com-

pensation carried out in long−term
Long term fuel trim of bank 2/
LONG FT #2 0 ± 20 % to compensate for a continual
Min.: −100 %, Max.: 100 %
deviation of the short−term fuel
trim from the central value.
Short term fuel trim associated
O2FT B1 S2 with the bank 1 sensor 2/ 0 ± 20 % Same as SHORT FT #1
Min.: −100 %, Max.: 100 %
Short term fuel trim associated
O2FT B2 S2 with the bank 2 sensor 2/ 0 ± 20 % Same as SHORT FT #2
Min.: −100 %, Max.: 100 %
Short term fuel trim associated S Lean: 0 % AF FT B1 S1 < 1
AF FT B1 S1 with the bank 1 sensor 1/ S Stoichiometric Air−Fuel Ratio=1 ¾
Min.: 0, Max.: 1.999 S Rich: 1 % AF FT B1 S1 < 1.999
Short term fuel trim associated S Lean: 0 % AF FT B2 S1 < 1
AF FT B2 S1 with the bank 2 sensor 1/ S Stoichiometric Air−Fuel Ratio=1 ¾
Min.: 0, Max.: 1.999 S Rich: 1 % AF FT B2 S1< 1.999

S OL: Open Loop−has not yet sa-

tisfied conditions to go closed
Fuel system status (Bank1) / loop.
FUEL SYS #1 OL or CL or OL DRIVE or S CL: Closed Loop−using heated
OL FAULT or CL FAULT oxygen sensor(s) as feed back
for fuel control.
S OL DRIVE: Open loop due to
Idli after
Idling ft warming
i up: CL d i i conditions.
driving diti (fuel
(f l enrich-
i h
ment)
S OL FAULT: Open loop due to de-
Fuel system status (Bank2) / tected system fault.
FUEL SYS #2 OL or CL or OL DRIVE or S CL FAULT: Closed loop but one
OL FAULT or CL FAULT of heated oxygen sensors, which
is used for fuel control, is func-
tioning improperly.
FC IDL Fuel cut operation/ ON or OFF Fuel cut operation: ON ¾
MIL MIL status/ ON or OFF MIL ON: ON ¾
STARTER SIG Starter signal/ ON or OFF Cranking: ON ¾
A/C SIG A/C signal/ ON or OFF A/C ON: ON ¾
Park/neutral position switch signal/
PNP SW [NSW] *2 P or N position: ON ¾
ON or OFF

Electrical load signal/ S Tail light switch ON: ON

ELECT LOAD SIG ¾
ON or OFF S Defogger switch ON: ON
Stop light switch/ S Brake pedal depressed: ON
STOP LIGHT SW ¾
ON or OFF S Brake pedal released: OFF

S During controlling the steering

Power steering signal/ wheel: ON The idle−up control is performed
PS OIL PRESS SW
ON or OFF S During non−controlling the steer- when PS is ON.
ing wheel: OFF

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DIAGNOSTICS − SFI SYSTEM (1GR−FE)

Measurement Item/Range
Hand−held Tester Display Normal Condition *1 Diagnostic Note
(Display)

Power steering signal/

PS SIGNAL After steer the steering: ON ¾
ON or OFF
VSV status for intake control
INTAKE CTL VSV1 VSV operation: ON ¾
(bank1)/ ON or OFF

Fuel pump speed control status/ S Idling: ON

FUEL PUMP SP CTL ¾
ON or OFF S Cranking: OFF
Fuel pump/speed status/
FUEL PUMP / SPD Idling: ON ¾
ON/H or OFF/M,L

A/C magnet clutch status/

A/C MAG CLUTCH A/C magnet clutch ON: ON ¾
ON or OFF
VSV status for EVAP control/ VSV for EVAP is controlled by the
EVAP VSV VSV operating: ON
ON or OFF ECM (ground side duty control)

VVT control status (bank 2)/

VVT CTRL B2 VVT system operation: ON ¾
ON or OFF
VVT control status (bank 1)/
VVT CTRL B1 VVT system operation: ON ¾
ON or OFF

IGNITION *3 Ignition counter/ Min.: 0, Max.: 600 0 to 600 ¾

Misfire ratio of the cylinder 1 − 6/
CYL #1, #2, #3, #4, #5, #6 *3 0% This item is displayed in only idling
Min.: 0 %, Max.: 50 %

Engine load for first misfire range/

MISFIRE LOAD *3 Misfire 0: 0 r/rev ¾
Min: 0 g/rev, Max.: 3.98 g/rev
Engine RPM for first misfire range/
MISFIRE RPM *3 Misfire 0: 0 rpm ¾
Min: 0 g/rpm, Max.: 6,375 rpm

The fuel cut is being performed un-

Fuel Cut TAU: Fuel cut during very der very light load to prevent the
FC TAU Fuel cut operating: ON
light load/ ON or OFF engine combustion from becoming
incomplete.

CHECK MODE Check mode/ ON or OFF Check mode ON: ON ¾

*1 :If no conditions are specifically stated for ”ldling”, it means the shift lever is in the N or P position, the A/C
switch is OFF and all accessory switches are OFF.
*2: For A/T only
*3: For Europe only

LAND CRUISER PRADO Supplement (RM1017E)

 05−19
DIAGNOSTICS − SFI SYSTEM (1GR−FE)

7. ACTIVE TEST
HINT:
Performing the ACTIVE TEST using the hand−held tester allows the relay, VSV, actuator and so on to oper-
ate without parts removal. Performing the ACTIVE TEST as a first step of troubleshooting is one of the meth-
od to shorten the labor time.
It is possible to display the DATA LIST during the ACTIVE TEST.
(a) Warm up the engine.
(b) Turn the ignition switch OFF.
(c) Connect the hand−held tester to the DLC3.
(d) Turn the ignition switch ON.
(e) Push the ”ON” button of the hand−held tester.
(f) Select the item ”DIAGNOSIS / OBD/MOBD / ACTIVE TEST”
(g) According to the display on tester, perform the ”ACTIVE TEST”.
Hand−held Tester Display Test Details Diagnostic Note
[Test Details]
S All injectors are tested at once.
Control the injection volume
S Injection volume is gradually
INJ VOL Min.: −12.5 %, Max.: 25 %
changed between −12.5 and 25
[Vehicle Condition]
%.
Engine speed: 3,000 rpm or less
The following procedure of A/F
CONTROL enables the user to
[Test Details] check its output (show its graph
Control the injection volume indication) of heated oxygen sen-
A/F CONTROL −12.5 or 25 % (Change the injection volume to −12.5 % or 25 %.) sor:
[Vehicle Condition] Select O2S B1 S1 and press but-
Engine speed: 3,000 rpm or less ton ”F4” after selecting ”ACTIVE
TEST/A/F CONTROL/USER
DATA”.

[Test Details]
FUEL PMP SP CTL Control the fuel pump speed ¾
ON or OFF
[Test Details]
INTAKE CTL VSV1 Activate the VSV for intake control. ¾
ON or OFF
[Test Details]
EVAP VSV (ALONE) Activate the VSV for EVAP control ¾
ON or OFF
[Test Details]
A/C MAG CLUTCH Control the A/C magnet clutch ¾
ON or OFF
[Test Details]
FUEL PUMP / SPD Control the fuel pump ¾
ON or OFF
[Test Details]
S ON: Rough idle or engine stall.
VVT CTRL B1 Active the VVT system (Bank 1).
S OFF: Normal engine speed.
ON or OFF
[Test Details]
S ON: Rough idle or engine stall.
VVT CTRL B2 Active the VVT system (Bank 2).
S OFF: Normal engine speed.
ON or OFF
[Test Details]
TC/TE1 Connect the TC and TE1 ¾
ON or OFF
[Test Details]
FC IDL PROHBT Control the idle fuel cut prohibit ¾
ON or OFF

LAND CRUISER PRADO Supplement (RM1017E)

05−20
DIAGNOSTICS − SFI SYSTEM (1GR−FE)

BASIC INSPECTION
When the malfunction code is not confirmed in the DTC check, troubleshooting should be carried out in all
the possible circuits considered as causes of the problems. In many cases, by carrying out the basic engine
check shown in the following flow chart, the location causing the problem can be found quickly and efficiently.
Therefore, using this check is essential in the engine troubleshooting.
1 CHECK BATTERY VOLTAGE

NOTICE:
Carry out this check with the engine stopped and ignition switch OFF.
OK NG
Voltage 11 V or more Less than 11 V

NG CHARGE OR REPLACE BATTERY

OK

2 CHECK IF ENGINE WILL CRANK

NG PROCEED TO PROBLEM SYMPTOMS TABLE

ON PAGE 05−33

OK

3 CHECK IF ENGINE STARTS

NG GO TO STEP 7

OK

4 CHECK AIR FILER

(a) Visually check that the air filter is not excessively dirty or
oily.
NOTICE:
If necessary, clean the filter with compressed air. First blow
from the inside thoroughly, then blow from the outside of
the filter.
NG REPAIR OR REPLACE
Inside
A66289

OK

5 CHECK IDLE SPEED (See page 14−1)

NG PROCEED TO PROBLEM SYMPTOMS TABLE

ON PAGE 05−33

OK
LAND CRUISER PRADO Supplement (RM1017E)
 05−21
DIAGNOSTICS − SFI SYSTEM (1GR−FE)

6 CHECK IGNITION TIMING (See page 14−1)

NG PROCEED TO PAGE 18−1 AND CONTINUE TO

TROUBLESHOOT

OK

PROCEED TO PROBLEM SYMPTOMS TABLE ON PAGE 05−33

7 CHECK FUEL PRESSURE (See page 11−5)

NG PROCEED TO PAGE 11−5 AND CONTINUE TO

TROUBLESHOOT

OK

8 CHECK FOR SPARK (See page 18−3)

NG PROCEED TO PAGE 18−1 AND CONTINUE TO

TROUBLESHOOT

OK

PROCEED TO PROBLEM SYMPTOMS TABLE ON PAGE 05−33

LAND CRUISER PRADO Supplement (RM1017E)