1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–361

OK

6 CHECK AIR INDUCTION SYSTEM

(a) Check for vacuum leaks in the air induction system.

OK:
No leakage in the air induction system.
NG REPAIR OR REPLACE AIR INDUCTION
SYSTEM

OK
ES
7 CHECK FUEL PRESSURE

OK:
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to
50 psi)
NG REPAIR OR REPLACE FUEL SYSTEM

OK

8 INSPECT FUEL INJECTOR ASSEMBLY

(a) Check injector injection (high or low fuel injection

quantity or poor injection pattern).
OK:
Injection volume: 36 to 46 cm3 (2.1 to 2.8 cu in.) per
15 seconds.
NG REPLACE FUEL INJECTOR ASSEMBLY

OK

9 REPLACE AIR FUEL RATIO SENSOR

GO

10 PERFORM CONFIRMATION DRIVING PATTERN

HINT:
Clear all DTCs prior to performing the confirmation driving
pattern.
GO

11 READ OUTPUT DTCS (SEE IF A/F SENSOR DTCS ARE OUTPUT AGAIN)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
 ES–362 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

(c) Turn the intelligent tester ON.

(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs using the intelligent tester.
Result
Display (DTC Output) Proceed to
No output A
A/F sensor circuit DTCs B

B REPLACE ECM AND PERFORM

CONFIRMATION DRIVING PATTERN

ES A

12 CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

OK:
Vehicle has run out of fuel in past.
NO CHECK FOR INTERMITTENT PROBLEMS

YES

DTCS ARE CAUSED BY RUNNING OUT OF FUEL

13 PERFORM CONFIRMATION DRIVING PATTERN

HINT:
Clear all DTCs prior to performing the confirmation driving
pattern.
GO

14 READ OUTPUT DTCS (SEE IF A/F SENSOR DTCS ARE OUTPUT AGAIN)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the intelligent tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs using the intelligent tester.
Result
Display (DTC Output) Proceed to
A/F sensor circuit DTCs A
No output B

B Go to step 18

A
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–363

15 REPLACE AIR FUEL RATIO SENSOR

GO

16 PERFORM CONFIRMATION DRIVING PATTERN

HINT:
Clear all DTCs prior to performing the confirmation driving
pattern.
GO
ES
17 READ OUTPUT DTCS (SEE IF A/F SENSOR DTCS ARE OUTPUT AGAIN)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the intelligent tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs using the intelligent tester.
Result
Display (DTC Output) Proceed to
No output A
A/F sensor circuit DTCs B

B REPLACE ECM AND PERFORM

CONFIRMATION DRIVING PATTERN

18 CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

OK:
Vehicle has run out of fuel in past.
NO CHECK FOR INTERMITTENT PROBLEMS

YES

DTCS ARE CAUSED BY RUNNING OUT OF FUEL

 ES–364 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

Oxygen (A/F) Sensor Pumping Current Circuit

DTC P2238
Low (Bank 1 Sensor 1)

Oxygen (A/F) Sensor Pumping Current Circuit

DTC P2239
High (Bank 1 Sensor 1)

Oxygen (A/F) Sensor Reference Ground Circuit

DTC P2252
Low (Bank 1 Sensor 1)

Oxygen (A/F) Sensor Reference Ground Circuit

ES DTC P2253
High (Bank 1 Sensor 1)
DESCRIPTION
Refer to DTC P2195 (see page ES-344).
DTC No. DTC Detection Condition Trouble Area
P2238 • AF+ is 0.5 V or less for 5 seconds or more • Open or short in A/F sensor circuit
• A/F sensor admittance: Less than 0.022 • A/F sensor
1/ • A/F sensor heater
• EFI M relay
• A/F sensor heater and relay circuit
• ECM
P2239 AF+ is more than 4.5 V for 5 seconds or more • Open or short in A/F sensor circuit
• A/F sensor
• A/F sensor heater
• EFI M relay
• A/F sensor heater and relay circuit
• ECM
P2252 AF- is 0.5 V or less for 5 seconds or more • Open or short in A/F sensor circuit
• A/F sensor
• A/F sensor heater
• EFI M relay
• A/F sensor heater and relay circuit
• ECM
P2253 AF- is more than 4.5 V for 5 seconds or more • Open or short in A/F sensor circuit
• A/F sensor
• A/F sensor heater
• EFI M relay
• A/F sensor heater and relay circuit
• ECM

MONITOR DESCRIPTION
The air fuel ratio (A/F) sensor has a characteristic that it varies its voltage output in proportion to the air-
fuel ratio. If impedance (alternating current resistance) or voltage output of the sensor extraordinarily
deviates from the standard range, the ECM determines to detect an open or short malfunction in the A/F
sensor circuit.

MONITOR STRATEGY
Related DTCs P2238: A/F sensor pumping current circuit low
P2239: A/F sensor pumping current circuit high
P2252: A/F sensor reference ground circuit low
P2253: A/F sensor reference ground circuit high
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–365

Required sensors/components (main) Main:

A/F sensor
Related:
Engine speed sensor, vehicle speed sensor, engine coolant
temperature sensor
Frequency of operation Continuous
Duration 10 seconds
MIL operation 2 driving cycles
Sequence of operation None

TYPICAL ENABLING CONDITIONS

"General precondition" is defined as follows:
Battery voltage 10.5 V or more
Power switch ON ES
Time after power switch from OFF to ON 5 seconds or more

"A/F sensor admittance precondition" is defined as follows:

Engine coolant temperature Closed - loop fuel control or more
Engine Running
Time after A/F sensor heating 20 seconds or more

P2238: A/F sensor pumping current circuit low

(AF+, AF- open)
The monitor will run whenever the following DTCs are not present None
Time while A/F sensor admittance precondition is met 10 seconds or more

P2238: A/F sensor pumping current circuit low

(AF+, AF- short)
General precondition Met

P2238: A/F sensor pumping current circuit low

(AF+, GND short)
General precondition Met

P2239: A/F sensor pumping current circuit high

General precondition Met

P2252: A/F sensor reference ground circuit low

General precondition Met

P2253: A/F sensor reference ground circuit high

General precondition Met

TYPICAL MALFUNCTION THRESHOLDS

P2238: A/F sensor pumping current circuit low
(AF+, AF- open)
A/F sensor admittance Less than 0.022 1/

P2238: A/F sensor pumping current circuit low

(AF+, AF- short)
A/F sensor admittance 0.1 V or less

P2238: A/F sensor pumping current circuit low

(AF+, GND short)
Difference between voltage of terminals AF+ and AF- 0.5 V or less
 ES–366 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

P2239: A/F sensor pumping current circuit high

(AF+, +B, VCC short)
AF+ terminal voltage (AF+ and +B, or AF+ and VCC short) More than 4.5 V

P2252: A/F sensor reference ground circuit low

AF- terminal voltage (AF- and GND short) 0.5 V or less

P2253: A/F sensor reference ground circuit high

AF- terminal voltage (AF- and +B, or AF- and VCC short) More than 4.5 V

WIRING DIAGRAM
Refer to DTC P2195 (see page ES-347).

ES INSPECTION PROCEDURE
HINT:
• Although the each DTC title says "oxygen sensor", these DTCs are related to the A/F sensor.
• Malfunctioning areas can be found by performing the ACTIVE TEST / A/F CONTROL operation. The
A/F CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential
trouble area are malfunctioning or not.
(a) Perform the ACTIVE TEST A/F CONTROL operation.
HINT:
The A/F CONTROL operation lowers the injection volume 12.5% or increases the injection volume 25%.
(1) Connect the intelligent tester to the DLC3.
(2) Turn the power switch ON (IG).
(3) Put the engine in inspection mode (see page ES-1).
(4) Warm up the engine by running the engine at 2,500 rpm, depressing the accelerator pedal more than
60% for approximately 90 seconds.
(5) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL.
(6) Perform the A/F CONTROL operation with the engine in an idle condition (press the right or left
button).
Result:
A/F sensor reacts in accordance with increase and decrease of injection volume:
+25% rich output: Less than 3.0 V
-12.5% lean output: More than 3.35 V
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25% rich output: More than 0.55 V
-12.5% lean output: Less than 0.4 V
NOTICE:
The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about
20 seconds of delay at maximum.
Main Suspected
Case A/F Sensor (Sensor 1) Output Voltage HO2 Sensor (Sensor 2) Output Voltage
Trouble Area

Injection Volume Injection Volume

+25% +25%
-12.5% -12.5%
1 -
Output Voltage Output Voltage
More than 3.35 V More than 0.55 V
Less than 3.0 V Less than 0.4 V
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–367

Main Suspected
Case A/F Sensor (Sensor 1) Output Voltage HO2 Sensor (Sensor 2) Output Voltage
Trouble Area

Injection Volume Injection Volume

2 +25% +25%
-12.5% -12.5%
• A/F sensor
Output • A/F sensor heater
Voltage Output Voltage • A/F sensor circuit
Almost More than 0.55 V
no Less than 0.4 V
reaction

Injection Volume Injection Volume

+25% +25%
-12.5% -12.5% • HO2 sensor
3 • HO2 sensor heater
Output Voltage
More than 3.35 V
Output Voltage
Almost
• HO2 sensor circuit ES
Less than 3.0 V no reaction

Injection Volume Injection Volume

+25% +25% • Fuel Injector
-12.5% -12.5% • Fuel pressure
• Gas leakage from
4
exhaust system (Air-
Output Voltage Output Voltage fuel ratio extremely
Almost Almost or lean rich)
no reaction no reaction

The following A/F CONTROL procedure enables the technician to check and graph the voltage output of
both A/F sensor and heated oxygen sensor.
To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, select "AFS B1S1 and O2S
B1S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.
HINT:
• Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition
when malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or
rich, and other data from the time the malfunction occurred.
• A high A/F sensor voltage could be caused by a RICH air-fuel mixture. Check the conditions that would
cause the engine to run with the RICH air-fuel mixture.
• A low A/F sensor voltage could be caused by a LEAN air-fuel mixture. Check the conditions that would
cause the engine to run with the LEAN air-fuel mixture.

1 INSPECT AIR FUEL RATIO SENSOR (RESISTANCE OF A/F SENSOR HEATER)

(a) Disconnect the A5 A/F sensor connector.

(b) Measure the resistance between the terminals of the A/F
sensor.
Standard resistance
Tester Connection Resistance
1 (HT) - 2 (+B) 1.8 to 3.4 at 20 C (68 F)

(c) Reconnect the A/F sensor connector.

A085152E51
NG REPLACE AIR FUEL RATIO SENSOR

OK
 ES–368 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

2 INSPECT INTEGRATION RELAY (EFI M RELAY)

(a) Remove the integration relay from the engine room relay
block.
(b) Inspect the EFI M relay.
Standard resistance
Tester Connection Specified Condition
3K-1 - 3I-8 10 k or higher
3K-1 - 3I-8 Below 1
(Apply battery voltage to terminals
3I-6 and 3I-7)

ES (c) Reinstall the integration relay.

NG REPLACE INTEGRATION RELAY

A082812E01

OK

3 CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

(a) Disconnect the A5 A/F sensor connector.

A085153E07

(b) Disconnect the E5 ECM connector.

(c) Check the resistance between the wire harness side
connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
A5-3 (AF+) - E5-23 (A1A+) Below 1
A5-4 (AF-) - E5-22 (A1A-) Below 1
A5-1 (HT) - E5-7 (HA1A) Below 1

A065745E71 Standard resistance (Check for short)

Tester Connection Specified Condition
A5-3 (AF+) or E5-23 (A1A+) - Body 10 k or higher
ground
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–369

Tester Connection Specified Condition

A5-4 (AF-) or E5-22 (A1A-) - Body 10 k or higher
ground
A5-1 (HT) or E5-7 (HA1A) - Body 10 k or higher
ground

(d) Reconnect the A/F sensor connector.

(e) Reconnect the ECM connector.

ES

B062793E19

NG REPAIR OR REPLACE HARNESS AND

CONNECTOR

OK

REPLACE ECM
 ES–370 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

Evaporative Emission Pressure Switching

DTC P2420
Valve Stuck OFF
DTC SUMMARY
Malfunction
DTC No. Monitoring Items Detection Trouble Areas Detection Timing Detection Logic
Conditions
The following • Canister pump
condition is met module
during key-off EVAP (reference orifice,
monitor: leak detection
Vent valve stuck • EVAP pressure pump, vent valve)
P2420 Power switch OFF 2 trip
open (vent) change when • Connector/wire
ES vent valve is
closed (ON) less
harness (canister
pump module -
than 0.3 kPa-g ECM)
(2.25 mmHg-g) • ECM

DESCRIPTION
NOTICE:
In this vehicle's EVAP system, turning ON the vent valve does not seal off the EVAP system. To
check for leaks in the EVAP system, disconnect the air inlet vent hose and apply pressure from
the atmosphere side of the canister.
While the engine is running, if a predetermined condition (closed loop, etc.) is met, the purge VSV is
opened by the ECM and stored fuel vapors in the canister are purged to the intake manifold. The ECM
changes the duty cycle ratio of the purge VSV to control purge flow volume.
The purge flow volume is also determined by the intake manifold pressure. Atmospheric pressure is
allowed into the canister through the vent valve to ensure that the purge flow is maintained when the
negative pressure (vacuum) is applied to the canister.
Key-off monitor
This monitor checks for Evaporative Emission (EVAP) system leaks and canister pump module
malfunctions. The monitor starts 5 hours* after the power switch is turned OFF. More than 5 hours are
required to allow the fuel to cool down to stabilize the Fuel Tank Pressure (FTP), thus making the EVAP
system monitor more accurate.
The leak detection pump creates negative pressure (vacuum) in the EVAP system and the pressure is
measured. Finally, the ECM monitors for leaks from the EVAP system and malfunctions in both the
canister pump module and purge VSV, based on the EVAP pressure.
HINT:
*: If the engine coolant temperature is not below 35 C (95 F) 5 hours after the power switch is turned OFF,
the monitor check starts 2 hours later. If it is still not below 35 C (95 F) 7 hours after the power switch is
turned OFF, the monitor check starts 2.5 hours later.
1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–371

ES

A131350E01
 ES–372 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

ES

A130305E01

A131438E01
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–373

ES

A115543E09

Components Operations
Canister, Trap canister Contains activated charcoal to absorb EVAP generated in fuel tank.
Cut-off valve Located in fuel tank. Valve floats and closes when fuel tank 100% full.
Opens or closes line between canister and intake manifold. ECM uses
purge VSV to control EVAP purge flow. In order to discharge EVAP
Purge Vacuum Switching Valve (VSV) absorbed by canister to intake manifold, ECM opens purge VSV.
EVAP discharge volume to intake manifold controlled by purge VSV
duty cycle ratio (current-carrying time) (open: ON; closed: OFF).
Located in fuel tank. Valve closes by its own weight when vehicle
Roll-over valve
overturns to prevent fuel from spilling out.
Built into ECM. To ensure accurate EVAP monitor, measures 5 hours
(+-15 min) after power switch OFF. This allows fuel to cool down,
Soak timer
stabilizing Fuel Tank Pressure (FTP). When approximately 5 hours
elapsed, ECM activates.
The pressure switching valve located on the canister is used to detect
leakage from the bladder tank into the fuel tank. The valve opens
Pressure switching valve
during the bladder tank leak check. Then, the fuel tank's fuel vapor
flows to the intake manifold without passing the canister.
Pump module Consists of (a) to (d) below. Pump module cannot be disassembled.
Vents and closes EVAP system. When ECM turns valve ON, EVAP
system closed. When ECM turns valve OFF, EVAP system vented.
(a) Vent valve Negative pressure (vacuum) created in EVAP system to check for
EVAP leaks by closing purge VSV, turning vent valve ON (closed) and
operating leak detection pump (refer to fig. 1).
Indicates pressure as voltage. ECM supplies regulated 5 V to canister
(b) Canister pressure sensor pressure sensor, and uses feedback from sensor to monitor EVAP
system pressure (refer to fig. 2).
(c) Leak detection pump Creates negative pressure (vacuum) in EVAP system for leak check.
 ES–374 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

Components Operations
Has opening with 0.02 inch diameter. Vacuum produced through
orifice by closing purge VSV, turning vent valve OFF and operating
(d) Reference orifice
leak detection pump to monitor 0.02 inch leak criterion. 0.02 inch leak
criterion indicates small leak of EVAP.

MONITOR DESCRIPTION
5 hours* after the power switch is turned OFF, the leak detection pump creates negative pressure
(vacuum) in the EVAP system. The ECM monitors for leaks and actuator malfunctions based on the EVAP
pressure.
HINT:
*: If the engine coolant temperature is not below 35 C (95 F) 5 hours after the power switch is turned OFF,
the monitor check starts 2 hours later. If it is still not below 35 C (95 F) 7 hours after the power switch is
ES turned OFF, the monitor check starts 2.5 hours later.
Sequence Operations Descriptions Duration
Activated by soak timer 5, 7 or 9.5
- ECM activation -
hours after power switch OFF.
Vent valve turned OFF (vent) and
EVAP system pressure measured
by ECM in order to register
atmospheric pressure.
Atmospheric pressure
A If pressure in EVAP system not 10 seconds
measurement
between 70 kPa and 110 kPa
(525 mmHg and 825 mmHg),
ECM cancels EVAP system
monitor.
In order to determine 0.02 inch
leak criterion, leak detection
pump creates negative pressure
First 0.02 inch leak criterion
B (vacuum) through reference 60 seconds
measurement
orifice and then ECM checks if
leak detection pump and vent
valve operate normally.
Vent valve turned ON (closed) to
shut EVAP system.
Negative pressure (vacuum)
created in EVAP system, and
EVAP system pressure then
EVAP system pressure measured.
C 900 seconds*
measurement Write down measured value as it
will be used in leak check.
If EVAP pressure does not
stabilize within 900 seconds,
ECM cancels EVAP system
monitor.
Purge VSV opened and then
EVAP system pressure measured
D Purge VSV monitor 10 seconds
by ECM.
Large increase indicates normal.
After second 0.02 inch leak
criterion measurement, leak
check performed by comparing
first and second 0.02 inch leak
Second 0.02 inch leak criterion
E criterion. 60 seconds
measurement
If stabilized system pressure
higher than second 0.02 inch leak
criterion, ECM determines that
EVAP system leaking.
Atmospheric pressure measured
- Final check and then monitoring result -
recorded by ECM.

*: If only a small amount of fuel is in the fuel tank, it takes longer for the EVAP pressure to stabilize.
1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–375

ES

A122912E01
 ES–376 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

1. P2420: Vent valve stuck open (vent)

In operation C, the vent valve turns ON (closes) and the EVAP system pressure is then measured by
the ECM using the canister pressure sensor to conduct an EVAP leak check. If pressure does not drop
when the vent valve is open, the ECM interprets this as the vent valve being stuck open. The ECM
illuminates the MIL and sets the DTC.

ES

A106067E03

MONITOR STRATEGY
Required Sensors/Components Purge VSV and canister pump module
Frequency of Operation Once per driving cycle
Duration Maximum 15 seconds
MIL Operation 2 driving cycles
Sequence of Operation None

TYPICAL ENABLING CONDITIONS

P0011, P0012, P0021, P0022 (VVT system-Advance, Retard)
P0100, P0101, P0102, P0103 (MAF sensor)
P0110, P0112, P0113 (IAT sensor)
P0115, P0116, P0117, P0118 (ECT sensor)
P0120, P0122, P0123, P0220, P0222, P0223, P2135,(TP sensor)
P0125 (Insufficient ECT for closed loop)
The monitor will run whenever these DTCs are not present P0171, P0172, P0174, P0175 (Fuel system)
P0300, P0301, P0302, P0303, P0304 (Misfire)
P0335 (CKP sensor)
P0340, P0341 (CMP sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0450, P0452, P0453 (EVAP press sensor)
P0500 (VSS)
Atmospheric pressure 70 to 110 kPa (525 to 825 mmHg)
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–377

Battery voltage 10.5 V or higher

Vehicle speed Less than 4 km/h (2.5 mph)
Power switch OFF
Time after key off 5, 7 or 9.5 hours
Purge VSV Not operated by scan tool
Vent valve Not operated by scan tool
Leak detection pump Not operated by scan tool
Both of the following conditions 1 and 2 are met before key off -
1. Duration that vehicle has been driven 5 minutes or more
2. EVAP purge operation Performed
ECT 4.4 to 35 C (40 to 95 F)
IAT 4.4 to 35 C (40 to 95 F)

1. Key-off monitor sequence 1 to 8 ES

1. Atmospheric pressure measurement
Next sequence is run if the following condition is met -
Atmospheric pressure change Within 0.3 kPa (2.25 mmHg) in 1 second

2. First reference pressure measurement

Next sequence is run if the following conditions are met -
EVAP pressure just after reference pressure measurement start 1 kPa ( 7.5 mmHg) or lower
Reference pressure -4.85 to -1.05 kPa (726 to 754 mmHg)
Reference pressure Saturated within 60 seconds

3. Vent valve stuck closed check

Next sequence is run if the following condition is met -
EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more

4. Vacuum introduction
Next sequence is run if the following condition is met -
EVAP pressure Saturated within 900 seconds

5. Purge VSV stuck closed check

Next sequence is run if the following condition is met -
EVAP pressure change after purge valve is open 0.3 kPa (2.25 mmHg) or more

6. Second reference pressure measurement

Next sequence is run if the following conditions are met -
EVAP pressure just after reference pressure measurement 1 kPa (7.5 mmHg) or lower
Reference pressure -4.85 to -1.05 kPa (726 to 754 mmHg)
Reference pressure Saturated within 60 seconds
Reference pressure difference between first and second Less than 0.7 kPa (5.25 mmHg)

7. Leak check
Next sequence is run if the following condition is met -
EVAP pressure when vacuum introduction is complete Lower than second reference pressure

8. Atmospheric pressure measurement

EVAP monitor is complete if the following condition is met -
Atmospheric pressure difference between sequence 1 and 8 Within 0.3 kPa (2.25 mmHg)

TYPICAL MALFUNCTION THRESHOLDS

1. P2420: Vent valve stuck open (vent)
EVAP pressure change after EVAP canister vent valve is ON Less than 0.3 kPa (2.25 mmHg)
 ES–378 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

MONITOR RESULT
Refer to CHECKING MONITOR STATUS (see page ES-15).

WIRING DIAGRAM

ES

A127933E01
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–379

INSPECTION PROCEDURE
NOTICE:
The intelligent tester is required to conduct the following diagnostic troubleshooting procedure.
HINT:
• Using the intelligent tester monitor results enable the EVAP system to be confirmed.
• Read freeze frame data using the intelligent tester. Freeze frame data records the engine conditions
when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the
vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or
rich, and other data from the time the malfunction occurred.

1 CONFIRM DTC

(a) Turn the power switch OFF and wait for 10 seconds.
ES
(b) Turn the power switch ON (IG).
(c) Turn the power switch OFF and wait for 10 seconds.
(d) Connect the intelligent tester to the DLC3.
(e) Turn the power switch ON (IG).
(f) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(g) Check if DTC P0446 is output.
NO Go to step 5

YES

2 PERFORM EVAP SYSTEM CHECK

(a) Note the freeze frame data and DTCs.

(b) Clear DTCs.
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / SYSTEM CHECK / EVAP SYS CHECK / AUTO
OPERATION.
(d) After the system check is finished, check for pending
DTCs.
OK:
No DTC is present.
NG Go to step 6

OK

3 CHECK OPERATION FOR PRESSURE SWITCHING VALVE

(a) Enter the following menus: DIAGNOSIS / ENHANCED

OBD II / ACTIVE TEST / TANK BYPASS VSV.
(b) Touch the pressure switching valve (TANK BYPASS
VSV) to feel the operating vibration.
OK:
The pressure switching valve is operated by the
ACTIVE TEST.
NG Go to step 18
 ES–380 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

OK

4 CHECK PRESSURE SWITCHING VALVE

(a) Turn the power switch OFF.

(b) Remove the pressure switching valve (see page EC-31).
(c) Reconnect the pressure switching valve connector.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / ACTIVE TEST / TANK BYPASS VSV.
(e) Check the airflow for the pressure switching valve.
OK:
The pressure switching valve operates normally.
ES
A087973E01
NG Go to step 19

OK Go to step 33

5 PERFORM EVAP SYSTEM CHECK

(a) Enter the following menus: DIAGNOSIS / ENHANCED

OBD II / SYSTEM CHECK / EVAP SYS CHECK / AUTO
OPERATION.
(b) After the system check is finished, check for pending
DTCs.
OK:
DTCs are present.
NG CHECK INTERMITTENT PROBLEMS

OK

6 CHECK DTC

(a) Check the DTCs that were present at the EVAP system
check.
OK:
P043E, P043F, P2401, P2402 and P2419 are present.
NG Go to step 10

OK

7 CHECK VENT VALVE CLOSE STUCK

(a) Allow the engine to idle.

(b) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / ACTIVE TEST / EVAP VSV.
(c) Turn the EVAP VSV ON (purge VSV open) and check
the VAPOR PRESS (EVAP pressure) for 10 seconds.
OK:
EVAP pressure is higher than 755 mmHg.
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–381

NG Go to step 20

OK

8 CHECK LEAK DETECTION PUMP OPERATION

(a) Turn the power switch OFF.

(b) Turn the power switch ON (IG).
(c) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / ACTIVE TEST / VACUUM PUMP.
(d) Touch the pump module to feel the operating vibration.
OK:
The leak detection pump is operated by the ES
ACTIVE TEST.
NG Go to step 21

OK

9 CHECK TRAP CANISTER

(a) Disconnect the vent hose from the pump module.

(b) Check that no moisture is in the pump module or the
vent hose.
OK:
No moisture.
OK Go to step 22

NG Go to step 23
A135512

10 CHECK DTC

(a) Check the DTCs that were present at the EVAP system
check.
OK:
P0441, P0455 and/or P0456 are present.
NG Go to step 16

OK

11 CHECK INSTALLATION FOR FUEL CAP

(a) Remove the fuel cap.

(b) Reinstall the fuel cap.
(c) Clear DTCs.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / SYSTEM CHECK / EVAP SYS CHECK / AUTO
OPERATION.
 ES–382 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

(e) After the system check is finished, check for pending

DTCs.
HINT:
If no DTC is present, this indicates that the fuel cap is
loosened.
OK:
No DTC is present.
OK REPAIR COMPLETED

NG

12 LOCATE LEAK POINT

ES
(a) Disconnect the vent hose (fresh air line) as shown in the
illustration.

A131407E01

(b) Connect the pressure gauge and air pump as shown in

the illustration.
(c) Pressurize the EVAP system until 24 to 28 mmHg.
(d) Locate the leak point.
HINT:
If the EVAP system has leakage, a whistling sound may
be heard.
OK:
The leak point is found.
OK Go to step 24

NG

13 CHECK FUEL CAP

Check that the fuel cap meets OEM specifications.

HINT:
If an EVAP tester is available, perform the fuel cap test
according to the tester's instructions.
OK:
Fuel cap meets OEM specifications.
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–383

NG Go to step 25

OK

14 CHECK OPERATION FOR PURGE VSV

(a) Enter the following menus: DIAGNOSIS / ENHANCED

OBD II / ACTIVE TEST / EVAP VSV.
(b) Touch the purge VSV to feel the operating vibration.
OK:
The purge VSV (EVAP VSV) is operated by the
ACTIVE TEST.
NG Go to step 26
ES
OK

15 CHECK INTAKE MANIFOLD PRESSURE

(a) Disconnect the purge VSV hose that is connected to the

throttle body.
(b) Allow the engine to idle.
(c) Check that the hose has suction using your finger.
OK:
The hose has suction.
NG Go to step 27

A130450E01
OK Go to step 28

16 CHECK DTC

(a) Check the DTCs that were present at the EVAP system
check.
OK:
P0451 is not present.
NG Go to step 9

OK

17 CHECK OPERATION FOR VENT VALVE

(a) Enter the following menus: DIAGNOSIS / ENHANCED

OBD II / ACTIVE TEST / VENT VALVE.
(b) Touch the pump module to feel the operating vibration.
OK:
The vent valve is operated by the ACTIVE TEST.
OK Go to step 9

NG Go to step 29
 ES–384 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

18 CHECK HARNESS AND CONNECTOR (PRESSURE SWITCHING VALVE - ECM AND EFI M
RELAY)

(a) Check the harness and the connectors between the

pressure switching valve and the ECM.
(1) Disconnect the V8 pressure switching valve
connector.

ES A072890E04

(2) Disconnect the E7 ECM connector.

(3) Measure the resistance between the wire harness
side connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
V8-1 (Pressure switching valve) - E7- Below 1
18 (TBP)

Standard resistance (Check for short)

A065744E70 Tester Connection Specified Condition
V8-1 (Pressure switching valve) or 10 k higher
E7-18 (TBP) - Body ground

(4) Reconnect the pressure switching valve connector.

(5) Reconnect the ECM connector.
(b) Check the harness and the connectors between the
pressure switching valve and the EFI M relay.
(1) Disconnect the V8 pressure switching valve
connector.
(2) Remove the integration relay from the engine room
relay block.
(3) Measure the resistance between the wire harness
side connector.
Standard resistance (Check for open)
Tester Connection Specified Condition
V8-2 (Pressure switching valve) - 3I-8 Below 1
(EFI M relay)

A082810E01
Standard resistance (Check for short)
Tester Connection Specified Condition
V8-2 (Pressure switching valve) or 3I- 10 k or higher
8 (EFI M relay) - Body ground

(4) Reconnect the pressure switching valve connector.

(5) Reinstall the integration relay.
NG Go to step 30

OK Go to step 31
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–385

19 REPLACE PRESSURE SWITCHING VALVE

Replace the pressure switching valve (see page EC-31).

NEXT Go to step 34

20 CHECK FOR VENT HOSE CLOG

(a) Turn the power switch OFF.

(b) Disconnect the vent hose (fresh air line) as shown in the
illustration.
(c) Allow the engine to idle. ES
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / ACTIVE TEST / EVAP VSV.
(e) Turn the purge VSV (EVAP VSV) ON and check the
EVAP pressure (VAPOR PRESS) for 10 seconds.
OK:
EVAP pressure is higher than 755 mmHg.
A135512
NG Go to step 22

OK Go to step 32

21 CHECK HARNESS AND CONNECTOR (LEAK DETECTION PUMP - ECM)

(a) Disconnect the V7 canister connector

A085258E49

(b) Disconnect the E7 ECM connector.

(c) Measure the resistance between the wire harness side
connector.
Standard resistance (Check for open)
Tester Connection Specified Condition
V7-1 (MTRB) - E7-13 (MPMP) Below 1
V7-6 (MGND) - Body ground Below 1

Standard resistance (Check for short)

A065744E71
Tester Connection Specified Condition
V7-1 (MTRB) or E7-13 (MPMP) - Body 10 k higher
ground

(d) Reconnect the canister connector.

(e) Reconnect the ECM connector.
 ES–386 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

NG Go to step 30

OK Go to step 31

22 REPLACE TRAP CANISTER WITH PUMP MODULE

Replace the trap canister with pump module (see page EC-
17).
NEXT Go to step 34

ES 23 CHECK FOR VENT HOSE DAMAGE

Check for hose damage as shown in the illustration. If

necessary, replace the vent hose.

A130304E01

NEXT Go to step 22
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–387

24 REPAIR OR REPLACE LEAK POINT

NEXT Go to step 34

25 REPLACE FUEL CAP

NEXT Go to step 34

26 CHECK HARNESS AND CONNECTOR (PURGE VSV - ECM) ES

(a) Disconnect the V1 purge VSV connector.

A052933E24

(b) Disconnect the E5 ECM connector.

(c) Check the harness and the connectors between the
ECM and the purge VSV connectors.
(1) Measure the resistance between the wire harness
side connector.
Standard resistance (Check for open)
Tester Connection Specified Condition
V1-1 - E5-14 (EVP1) Below 1

A065745E73 Standard resistance (Check for short)

Tester Connection Specified Condition
V1-1 or E5-14 (EVP1) - Body ground 10 k higher

(d) Remove the integration relay from the engine room relay
block.
(e) Check the harness and connectors between the purge
VSV connector and the EFI M relay.
(1) Measure the resistance between the wire harness
side connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
V1-2 - 3I-8 (EFI M relay) Below 1
A082810E01

Standard resistance (Check for short)

Tester Connection Specified Condition
V1-2 or 3I-8 (EFI M relay) - Body 10 k higher
ground

(f) Reconnect the purge VSV connector.

(g) Reconnect the ECM connector.
 ES–388 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

(h) Reinstall the integration relay.

NG Go to step 30

OK Go to step 31

27 REPLACE HOSE (PURGE VSV - THROTTLE BODY)

NEXT Go to step 34

28 REPLACE PURGE VSV

ES
Replace the purge VSV (see page EC-23).
NEXT Go to step 34

29 CHECK HARNESS AND CONNECTOR (VENT VALVE - ECM)

(a) Disconnect the V7 canister connector.

A085258E50

(b) Disconnect the E7 ECM connector.

(c) Check the harness and the connectors between the
ECM and the canister connectors.
(1) Measure the resistance between the wire harness
side connector.
Standard resistance (Check for open)
Tester Connection Specified Condition
V7-8 (VGND) - E7-26 (VPMP) Below 1

A065744E72 Standard resistance (Check for short)

Tester Connection Specified Condition
V7-8 (VGND) or E7-26 (VPMP) - Body 10 k higher
ground
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–389

(d) Remove the integration relay from the engine room relay
block.
(e) Check the harness and connectors between the canister
connector and the EFI M relay.
(1) Measure the resistance between the wire harness
side connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
V7-9 (VLVB) - 3I-8 (EFI M relay) Below 1
A082810E01

Standard resistance (Check for short)

Tester Connection Specified Condition

ES
V7-9 (VLVB) or 3I-8 (EFI M relay) - 10 k higher
Body ground

(f) Reconnect the canister connector.

(g) Reconnect the ECM connector.
(h) Reinstall the integration relay.
NG Go to step 30

OK Go to step 31

30 REPAIR OR REPLACE HARNESS AND CONNECTOR

NEXT Go to step 34

31 REPLACE ECM

Replace the ECM (see page ES-469).

NEXT Go to step 34

32 CHECK AND REPLACE VENT HOSE OR CANISTER FILTER

NEXT Go to step 34

33 REPLACE HOSE (PRESSURE SWITCHING VALVE AND FUEL TANK)

NEXT

34 PERFORM EVAP SYSTEM CHECK

(a) Turn the power switch ON (IG).

(b) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / SYSTEM CHECK / EVAP SYS CHECK / AUTO
OPERATION.
(c) After the system check is finished, check for pending
DTCs.
 ES–390 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

OK:
No DTC is present.
NG Go to step 6

OK

35 PERFORM EVAP MONITOR DRIVE PATTERN

(a) Check that the following conditions are met:

• Fuel level is 1/8 to 7/8.
• Engine coolant temperature (ECT) is 4.4 to 35 C (40
to 95 F).
ES • Intake air temperature (IAT) is 4.4 to 35 C (40 to
95 F).
• Difference of ECT and IAT is less than 7 C (13 F).
(b) Enter the check mode. Enter the following menus:
DIAGNOSIS / ENHANCED OBD II / CHECK MODE.
(c) Allow the engine to idle until the ECT is 75 C (167 F).
(d) Drive the vehicle at 50 km/h (30 mph) or faster and
maintain that speed for 60 seconds or more.
(e) Stop the vehicle. Do not turn the power switch OFF.
(f) Check that the EVAP monitor status is complete. Enter
the following menus: DIAGNOSIS / ENHANCED OBD II /
MONITOR STATUS.
(g) If the EVAP monitor is incomplete, drive the vehicle at 50
km/h (30 mph) or faster and maintain that speed for 120
seconds or more. After that, recheck the EVAP monitor
status.
(h) Check for pending DTCs.
OK:
No DTC is present.
NG Go to step 2

OK

REPAIR COMPLETED
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–391

Coolant Pump Control Circuit Range / Perfor-

DTC P2601
mance
DESCRIPTION
The coolant heat storage system uses an electric pump to supply hot coolant stored in the CHS tank into
the cylinder head of the engine, in order to optimize engine starting combustion and reduce the amount of
unburned gas that is discharged while the engine is started. Before the engine starts, the ECM operates
the electric water pump to direct the hot coolant in the CHS tank into the engine, in order to heat the
cylinder head (this process is called "preheat mode"). This system consists of the CHS tank, CHS water
pump, CHS tank outlet temperature sensor, water valve, and a soak timer that is built in the ECM.
DTC No. DTC Detection Condition Trouble Area
P2601 Following conditions are successively met:
• Difference in CHS tank outlet water
•
•
CHS water pump
CHS water pump relay
ES
temperature and engine coolant • Open or short in CHS water pump circuit
temperatures before and after starting • ECM
preheating: within 2 C (3.6 F)
• Change in CHS tank outlet water
temperature during soaking: Below 1 C
(1.8 F) of its temperature before CHS
water pump is ON

MONITOR DESCRIPTION
The ECM detects malfunction in the coolant heat storage (CHS) system with the CHS tank coolant
temperature, the position of the water valve, the running condition of the engine and the operating
condition of the soak timer.
The soak timer built in the ECM prompts the ECM to actuate the water pump 5 hours after the HV system
has been turned OFF by using the power switch. The ECM then checks the HV main system based on
variations in the CHS tank outlet temperature (soak mode).
In order to ensure the reliable malfunction detection, the ECM detects the CHS water pump malfunction
DTC in two ways. Thus, when the following two detection conditions are consecutively met, the ECM
determines that there is malfunction in the water pump circuit and sets the DTC.
(1) Difference in the CHS tank outlet temperature and the engine coolant temperature before and after
starting preheating at engine start (system start) is below 2 C (3.6 F).
(2) Variation in the CHS tank outlet temperature during soak mode is within 1 C (1.8 F) of its temperature
before the CHS water pump was ON.

MONITOR STRATEGY
Related DTCs P2601: Coolant pump control circuit range/performance
Required sensors/components Coolant heat storage tank outlet temperature sensor
Frequency of operation Once per driving cycle
Duration 10 seconds
MIL operation 1 driving cycle
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present None
Coolant heat storage system malfunction Not detected
CHS water pump operation time 3 seconds or more
Variation in CHS tank outlet temperature and engine coolant 2 C (3.6 F) or less
temperature before and after preheating
Storage coolant temperature More than 65 C (149 F)
 ES–392 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

TYPICAL MALFUNCTION THRESHOLDS

Difference in CHS tank outlet coolant temperature before and after Less than 1 C (1.8 F)
CHS water pump ON

WIRING DIAGRAM
Refer to DTC P1120 (see page ES-301).

INSPECTION PROCEDURE
CAUTION:
Be careful when replacing any part in the CHS system or changing the coolant because the
coolant in the CHS tank is hot even if the engine and the radiator are cold.
ES NOTICE:
If air bleeding is not performed completely, this DTC may be detected after changing the coolant.
HINT:
• CHS stands for Coolant Heat Storage.
• Although the DTC title says "Coolant Pump", this DTC is related to the CHS water pump.
• The detection of this DTC indicates a malfunction in both the CHS water pump and the CHS W/P relay.
Therefore, make sure to also check the relay when this DTC is output.
• To check the coolant heat storage (CHS) system, the ECM may cause the water pump of the CHS
system to operate 5 hours after the power switch has been turned OFF.
• Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition
when malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or
rich, and other data from the time the malfunction occurred.

1 CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P2601)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs.
Result
Display (DTC Output) Proceed to
P2601 A
P2601 and other DTCs B

HINT:
If any other codes besides P2601 are output, perform
troubleshooting for those DTCs first.
B GO TO RELEVANT DTC CHART

2 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE WATER PUMP)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the tester ON.
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–393

(d) Enter the following menus: DIAGNOSIS / ENHANCED

OBD II / ACTIVE TEST / WATER PUMP.
(e) Check that the CHS W/P relay operates and the
operating sounds of the water pump occurs.
Result
Tester operation Specified Condition
WATER PUMP ON CHS W/P relay and water pump
operates

NG Go to step 5

OK

ES
3 INSPECT TEMPERATURE SENSOR (CHS TANK OUTLET TEMPERATURE SENSOR)

(a) Remove the coolant heat storage (CHS) tank outlet

temperature sensor.
(b) Measure the resistance between the terminals.
Standard resistance
Tester Connection Specified Condition
1-2 2 to 3 k at 20 C (68 F)
1-2 0.2 to 0.4 k at 80 C (176 F)

NOTICE:
In case of checking the CHS tank outlet temperature
sensor in the water, be careful not to allow water to
contact the terminals. After checking, dry the sensor.
HINT:
Alternate procedure: Connect an ohmmeter to the
installed CHS tank outlet temperature sensor and read
the resistance. Use an infrared thermometer to measure
the CHS tank outlet temperature in the immediate vicinity
of the sensor. Compare these values to the resistance/
temperature graph. Change the engine temperature
(warm up or allow to cool down) and repeat the test.
A081700E08 (c) Reinstall the coolant heat storage tank outlet
temperature sensor.
NG REPLACE TEMPERATURE SENSOR

OK
 ES–394 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

4 CHECK HARNESS AND CONNECTOR (ECM - CHS TANK OUTLET TEMPERATURE

SENSOR)

(a) Check the harness and the connectors between the CHS
tank outlet temperature sensor connector and the ECM
connector.
(1) Disconnect the C19 CHS tank outlet temperature
sensor connector.

ES A082813E03

(2) Disconnect the E4 and E7 ECM connectors.

(3) Measure the resistance between the wire harness
side connectors.
Standard resistance (Check for open):
Tester Connection Specified Condition
C19-2 (CHS tank outlet temperature Below 1
sensor) - E7-33 (THW2)
C19-1 (CHS tank outlet temperature Below 1
sensor) - E4-28 (E2)
A082814E01
Standard resistance (Check for short):
Tester Connection Specified Condition
C19-2 (CHS tank outlet temperature 10 k or higher
sensor) or E7-33 (THW2) - Body
ground

(4) Reconnect the CHS tank outlet temperature sensor

connector.
(5) Reconnect the ECM connectors.
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

REPLACE ECM
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–395

5 INSPECT COOLANT HEAT STORAGE WATER PUMP RELAY (CHS WATER PUMP RELAY)

(a) Remove the CHS W/P relay from the engine room No. 2
relay block.
(b) Inspect the CHS W/P relay.
Standard resistance
Tester Connection Specified Condition
3-5 Below 1
3-5 10 k or higher
(Apply battery voltage to terminals 1
and 2)
B016200E02
(c) Reinstall the CHS W/P relay. ES
NG REPLACE COOLANT HEAT STORAGE
WATER PUMP RELAY

OK

6 INSPECT WATER W/MOTOR & BRACKET PUMP ASSEMBLY

(a) Disconnect the C20 CHS water pump connector.

(b) Measure the resistance between the terminals of the
water pump.
Standard resistance
Tester Connection Specified Condition
1-2 0.3 to 100

(c) Reconnect the CHS water pump connector.

A075926E01
NG REPLACE WATER W/MOTOR & BRACKET
PUMP ASSEMBLY

OK

7 CHECK HARNESS AND CONNECTOR (CHS W/P RELAY - WATER PUMP AND ECM,
WATER PUMP - GROUND)

(a) Check the harness and the connectors between the CHS
water pump connector and the ECM connector.
(1) Remove the CHS W/P relay from the engine room
No. 2 relay block.

A052933E20
 ES–396 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

(2) Disconnect the E7 ECM connector.

(3) Measure the resistance between the wire harness
side connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
E7-15 (WPL) - 2 (CHS W/P relay) Below 1

Standard resistance (Check for short)

Tester Connection Specified Condition
A065744E36
2 (CHS W/P relay) or E7-15 (WPL) - 10 k or higher
Body ground

(4) Reinstall the integration relay.

ES (5) Reconnect the ECM connector.
(b) Check the harness and the connectors between the CHS
water pump connector and the CHS W/P relay.
(1) Disconnect the CHS water pump connector.
(2) Remove the CHS W/P relay from the engine room
relay block No.2.
(3) Measure the resistance between the wire harness
side connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
2 (CHS water pump) - 5 (CHS W/P Below 1
relay)
1 (CHS water pump) - Body ground Below 1
A082840E01

Standard resistance (Check for short)

Tester Connection Specified Condition
2 (CHS water pump) or 5 (CHS W/P 10 k or higher
relay) - Body ground

(4) Reconnect the CHS water pump connector.

(5) Reinstall the integration relay.
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

REPLACE ECM
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–397

ECM / PCM Internal Engine Off Timer Perfor-

DTC P2610
mance
MONITOR DESCRIPTION
To check the heat retention of the tank in the coolant heat storage (CHS) system, the ECM may cause the
water pump of the CHS system to operate 5 hours after the power switch has been turned OFF.
A timer and a clock are contained in the ECM internal circuit, and the timer starts when the power switch
is turned OFF (this process is called the "soak mode").
When the HV main system is started at the power switch, the ECM monitors its internal circuit. If the ECM
detects a deviation between the clock and the timer, or an abnormal condition during a comparison
between the starting history and the length of time the HV main power has been turned OFF, the ECM
determines that its internal circuit has malfunction and sets a DTC.
DTC No. DTC Detection Condition Trouble Area
ES
P2610 ECM internal error • ECM

MONITOR STRATEGY
Related DTCs P2610: ECM internal engine off timer performance
Required sensors/components (main) ECM
Frequency of operation Once per driving cycle
Duration 600 seconds
MIL operation 2 driving cycles
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present None
Engine Running

TYPICAL MALFUNCTION THRESHOLDS

Case 1
Time internal engine off timer clock reads when CPU clock has Less than 420 seconds or more than 780 seconds
elapsed 600 seconds

Case 2
Presents of history that ECM had woken up by internal engine off YES
timer
Time period vehicle has been soaked Less than programmed period

Case 3
Presents of history that ECM had woken up by internal engine off NO
timer
Time period vehicle has been soaked More than or equal to programmed period

INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when
malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data
from the time the malfunction occurred.
 ES–398 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

1 REPLACE ECM

NEXT

REPAIR COMPLETED

ES
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–399

A/F Sensor Circuit Slow Response (Bank 1

DTC P2A00
Sensor 1)
DESCRIPTION
Refer to DTC P2195 (see page ES-344).
DTC No. DTC Detection Condition Trouble Area
P2A00 When A/F sensor output voltage change is • Open or short in A/F sensor (bank 1
below compared to fuel trim change, ECM sensor 1) circuit
judges that A/F sensor circuit response is • A/F sensor (bank 1 sensor 1)
slow if conditions (a), (b) and (c) are met (2 • A/F sensor heater
trip detection logic): • EFI M relay
(a) After engine is warmed up • A/F sensor heater and relay circuit

ES
(b) Engine speed is 1,100 rpm or more • Air induction system
(c) Vehicle speed 37.5 mph (60 km/h) or more • Fuel pressure
• Injector
• PCV hose connection
• ECM

HINT:
Sensor 1 refers to the sensor mounted before the TWC and is located near the engine assembly.

MONITOR DESCRIPTION

A082390E04

The air fuel-ratio (A/F) sensor varies its output voltage in proportion to the air-fuel ratio. Based on the
output voltage, the ECM determines if the air-fuel ratio is RICH or LEAN and adjusts the stoichiometric air-
fuel ratio.
The ECM also checks the fuel injection volume compensation value to check if the A/F sensor is
deteriorating or not. The output voltage variation, known as locus length, should be high when the air-fuel
ratio fluctuates.
 ES–400 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

When the A/F sensor response rate has deteriorated, the locus length should be short.
The ECM concludes that there is malfunction in the A/F sensor when the locus length is short and the
response rate has deteriorated.

MONITOR STRATEGY
Related DTCs P2A00: A/F sensor circuit slow response
Required sensors/components Main:
A/F sensor
Related:
Engine speed sensor, vehicle speed sensor
Frequency of operation Once per driving cycle
Duration 60 seconds
MIL operation 2 driving cycles
ES Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present P0031, P0032 (A/F sensor heater - Sensor 1)
P0100 - P0103 (MAF meter)
P0110 - P0113 (IAT sensor)
P0115 - P0118 (ECT sensor)
P0120 - P0223, P2135 (TP sensor)
P0125 (Insufficient ECT for closed loop)
P0171, P0172 (Fuel system)
P0300 - P0304 (Misfire)
P0335 (CKP sensor)
P0340, P0341 (CMP sensor)
P0442 - P0456 (EVAP system)
P0500 (VSS)
P2196 (A/F sensor - Rationality)
Engine Running
Time after first engine start 120 seconds
Fuel system status Closed-loop
A/F sensor status Activated
Idle OFF
Time after idle off 2 seconds or more
Engine speed 1,100 rpm or more, and less than 3,400 rpm
Vehicle speed 37.5 mph (60 km/h) or more, and Less than 75 mph (120 km/h)
Fuel cut OFF
Time after fuel cut is off 3 seconds or more

TYPICAL MALFUNCTION THRESHOLDS

Response rate deterioration level 8 or more

COMPONENT OPERATING RANGE

Heated oxygen sensor heater current 0.4 to 1.0 A (during idling and battery voltage 11 to 14 V)

MONITOR RESULT
Refer to detailed information (see page ES-15).

WIRING DIAGRAM
Refer to DTC P2195 (see page ES-347).
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–401

INSPECTION PROCEDURE
HINT:
Malfunctioning areas can be found by performing the ACTIVE TEST / A/F CONTROL operation. The A/F
CONTROL operation can determine if the A/F sensor, heated oxygen sensor or other potential trouble
area are malfunctioning or not.
(a) Perform the ACTIVE TEST A/F CONTROL operation.
HINT:
The A/F CONTROL operation lowers the injection volume 12.5% or increases the injection volume 25%.
(1) Connect the intelligent tester to the DLC3.
(2) Turn the power switch ON (IG).
(3) Put the engine in inspection mode (see page ES-1).
(4) Warm up the engine by running the engine at 2,500 rpm, depressing the accelerator pedal more than
60% for approximately 90 seconds.
(5) Enter the following menus: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / A/F CONTROL. ES
(6) Perform the A/F CONTROL operation with the engine in an idle condition (press the right or left
button).
Result:
A/F sensor reacts in accordance with increase and decrease of injection volume:
+25% rich output: Less than 3.0 V
-12.5% lean output: More than 3.35 V
Heated oxygen sensor reacts in accordance with increase and decrease of injection volume:
+25% rich output: More than 0.55 V
-12.5% lean output: Less than 0.4 V
NOTICE:
The A/F sensor output has a few seconds of delay and the heated oxygen sensor output has about
20 seconds of delay at maximum.
Main Suspected
Case A/F Sensor (Sensor 1) Output Voltage HO2 Sensor (Sensor 2) Output Voltage
Trouble Area

Injection Volume Injection Volume

+25% +25%
-12.5% -12.5%
1 -
Output Voltage Output Voltage
More than 3.35 V More than 0.55 V
Less than 3.0 V Less than 0.4 V

Injection Volume Injection Volume

+25% +25%
-12.5% -12.5% • A/F sensor
2 • A/F sensor heater
Output Voltage Output Voltage • A/F sensor circuit
Almost More than 0.55 V
no reaction Less than 0.4 V

Injection Volume Injection Volume

+25% +25%
-12.5% -12.5% • HO2 sensor
3 • HO2 sensor heater
Output Voltage Output Voltage • HO2 sensor circuit
More than 3.35 V Almost
Less than 3.0 V no reaction

Injection Volume Injection Volume

+25% +25% • Fuel Injector
-12.5% -12.5% • Fuel pressure
• Gas leakage from
4
exhaust system (Air-
Output Voltage Output Voltage fuel ratio extremely
Almost Almost or lean rich)
no reaction no reaction
 ES–402 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

The following A/F CONTROL procedure enables the technician to check and graph the voltage output of
both A/F sensor and heated oxygen sensor.
To display the graph, enter ACTIVE TEST/ A/F CONTROL/USER DATA, select "AFS B1S1 and O2S
B1S2" by pressing the "YES" button followed by the "ENTER" button and then the "F4" button.
HINT:
• DTC P2A00 may be also detected, when the air-fuel ratio stays RICH or LEAN.
• Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition
when malfunction is detected. When troubleshooting, freeze frame data can help determine if the
vehicle was running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or
rich, and other data from the time the malfunction occurred.
• A high A/F sensor voltage could be caused by a RICH air-fuel mixture. Check the conditions that would
cause the engine to run with the RICH air-fuel mixture.
• A low A/F sensor voltage could be caused by a LEAN air-fuel mixture. Check the conditions that would
ES cause the engine to run with the LEAN air-fuel mixture.

1 CHECK OTHER DTC OUTPUT (IN ADDITION TO A/F SENSOR DTC)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs.
Result
Display (DTC Output) Proceed to
P2A00 A
P2A00 and other DTCs B

HINT:
If any other code besides P2A00 are output, perform
troubleshooting for those DTCs first.
B GO TO RELEVANT DTC CHART

2 READ VALUE OF INTELLIGENT TESTER (OUTPUT VOLTAGE OF A/F SENSOR)

(a) Connect the intelligent tester to the DLC 3.

(b) Put the engine in inspection mode (see page ES-1).
(c) Warm up the A/F sensors (bank 1 sensor 1) by running
the engine at 2,500 rpm with the accelerator pedal
depressed more than 60 % for approximately 90
seconds.
(d) Read A/F sensor voltage output on the intelligent tester.
(e) Enter the following menus: ENHANCED OBD II /
SNAPSHOT / MANUAL SNAPSHOT / USER DATA.
(f) Select "AFS B1 S1/ENGINE SPD" and press button
"YES".
(g) Monitor the A/F sensor voltage carefully.
(h) Check the A/F sensor voltage output under the following
conditions:
(1) Put the engine in inspection mode and allow the
engine to idle for 30 seconds.
1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–403

(2) Put the engine in inspection mode and running the

engine at 2,500 rpm with the accelerator pedal
depressed more than 60% (where engine RPM is
not suddenly changed).
(3) Deactivate the inspection mode and drive the
vehicle with shift position "B" range.
(4) Accelerate the vehicle to 70 km/h (44 mph) and
quickly release the accelerator pedal so that the
throttle valve is fully closed.
CAUTION:
• Strictly observe of posted speed limits, traffic laws,
and road conditions when performing these drive
patterns.
• Do not drive the vehicle without deactivating ES
inspection mode, otherwise damaging the transaxle
may result.
OK:
Condition (1) and (2)
Voltage changes in the vicinity of 3.3 V (between
approximately 3.1 to 3.5 V) as shown in the illustration.
Condition (4)
A/F sensor voltage increases to 3.8 V or more during
engine deceleration (when fuel cut) as shown in the
illustration.

A072304E10

HINT:
• Whenever the output voltage of the A/F sensor remains at
approximately 3.3 V (see diagram Malfunction Condition)
under any condition as well as the above conditions, the A/
F sensor may have an open-circuit. (This will happen also
when the A/F sensor heater has an open-circuit.)
 ES–404 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

• Whenever the output voltage of the A/F sensor remains at

a certain value of approximately 3.8 V or more, or 2.8 V or
less (see diagram Malfunction Condition) under any
condition as well as the above conditions, the A/F sensor
may have a short-circuit.
• The ECM will stop fuel injection (fuel cut) during engine
deceleration. This will cause a LEAN condition and should
result in a momentary increase in A/F sensor voltage
output.
• The ECM must establish a closed throttle position learned
value to perform fuel cut. If the battery terminal was
reconnected, the vehicle must be driven over 10 mph to
allow the ECM to learn the closed throttle position.
ES • When the vehicle is driven:
The output voltage of the A/F sensor may be below 2.8 V
during fuel enrichment. For the vehicle, this translates to a
sudden increase in speed with the accelerator pedal fully
depressed when trying to overtake another vehicle. The A/
F sensor is functioning normally.
• The A/F sensor is a current output element, and therefore
the current is converted into voltage inside the ECM. If
measuring voltage at connectors of A/F sensor or ECM,
you will observe a constant voltage.
OK Go to step 14

NG

3 INSPECT AIR FUEL RATIO SENSOR (RESISTANCE OF A/F SENSOR HEATER)

(a) Disconnect the A5 A/F sensor connector.

(b) Measure the resistance between the terminals of the A/F
sensor.
Standard resistance
Tester Connection Resistance
1 (HT) - 2 (+B) 1.8 to 3.4 at 20 C (68 F)

(c) Reconnect the A/F sensor connector.

A085152E51
NG REPLACE AIR FUEL RATIO SENSOR

OK
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–405

4 INSPECT INTEGRATION RELAY (EFI M RELAY)

(a) Remove the integration relay from the engine room relay
block.
(b) Inspect the EFI M relay.
Standard resistance
Tester Connection Specified Condition
3K-1 - 3I-8 10 k or higher
3K-1 - 3I-8 Below 1
(Apply battery voltage to terminals
3I-6 and 3I-7)

(c) Reinstall the integration relay. ES

NG REPLACE INTEGRATION RELAY

A082812E01

OK

5 CHECK HARNESS AND CONNECTOR (A/F SENSOR - ECM)

(a) Disconnect the A5 A/F sensor connector.

A085153E07

(b) Disconnect the E5 ECM connector.

(c) Measure the resistance between the wire harness side
connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
A5-3 (AF+) - E5-23 (A1A+) Below 1
A5-4 (AF-) - E5-22 (A1A-) Below 1
A5-1 (HT) - E5-7 (HA1A) Below 1

A065745E71 Standard resistance (Check for short)

Tester Connection Specified Condition
A5-3 (AF+) or E5-23 (A1A+) - Body 10 k or higher
ground
 ES–406 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

Tester Connection Specified Condition

A5-4 (AF-) or E5-22 (A1A-) - Body 10 k or higher
ground
A5-1 (HT) or E5-7 (HA1A) - Body 10 k or higher
ground

(d) Reconnect the A/F sensor connector.

(e) Reconnect the ECM connector.

ES

B062793E19

NG REPAIR OR REPLACE HARNESS AND

CONNECTOR

OK

6 CHECK AIR INDUCTION SYSTEM

(a) Check for vacuum leaks in the air induction system.

OK:
There is no leakage in the air induction system.
NG REPAIR OR REPLACE AIR INDUCTION
SYSTEM

OK

7 CHECK CONNECTION OF PCV HOSE

OK:
PCV hose is connected correctly and PCV hose has no
damage.
NG REPAIR OR REPLACE PCV HOSE

OK
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–407

8 CHECK FUEL PRESSURE

OK:
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to
50 psi)
NG REPAIR OR REPLACE FUEL SYSTEM

OK

9 INSPECT FUEL INJECTOR ASSEMBLY

ES
(a) Check the injector injection (high or low fuel injection
quantity or poor injection pattern).
OK:
Injection volume: 36 to 46 cm3 (2.1 to 2.8 cu in.) per
15 seconds.
NG REPLACE FUEL INJECTOR ASSEMBLY

OK

10 REPLACE AIR FUEL RATIO SENSOR

GO

11 PERFORM CONFIRMATION DRIVING PATTERN

HINT:
Clear all DTCs prior to performing the confirmation driving
pattern (see page ES-347).
GO

12 READ OUTPUT DTC (SEE IF A/F SENSOR DTC IS OUTPUT AGAIN)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs.
Result
Display (DTC Output) Proceed to
No output A
P2A00 again. B

B REPLACE ECM AND PERFORM

CONFIRMATION DRIVING PATTERN
 ES–408 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

13 CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

OK:
Vehicle has run out of the fuel in the past.
NO CHECK FOR INTERMITTENT PROBLEMS

YES

ES DTC IS CAUSED BY RUNNING OUT OF FUEL

14 PERFORM CONFIRMATION DRIVING PATTERN

HINT:
Clear all DTCs prior to performing the confirmation driving
pattern (see page ES-347).
GO

15 READ OUTPUT DTC (SEE IF A/F SENSOR DTC IS OUTPUT AGAIN)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs.
Result
Display (DTC Output) Proceed to
P2A00 A
No output B

B Go to step 19

16 REPLACE AIR FUEL RATIO SENSOR

GO

17 PERFORM CONFIRMATION DRIVING PATTERN

HINT:
Clear all DTCs prior to performing the confirmation driving
pattern (see page ES-347).
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–409

GO

18 READ OUTPUT DTC (SEE IF A/F SENSOR DTC IS OUTPUT AGAIN)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs.
Result
Display (DTC Output)
No output
Proceed to
A
ES
P2A00 B

B REPLACE ECM AND PERFORM

CONFIRMATION DRIVING PATTERN

19 CONFIRM IF VEHICLE HAS RUN OUT OF FUEL IN PAST

OK:
Vehicle has run out of the fuel in the past.
NO CHECK FOR INTERMITTENT PROBLEMS

YES

DTC IS CAUSED BY RUNNING OUT OF FUEL

 ES–410 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

DTC P3190 Poor Engine Power

DTC P3191 Engine dose not Start

DTC P3193 Fuel Run Out

DESCRIPTION
From the HV ECU, the ECM receives data such as power output required for the engine (required output),
estimated torque produced by the engine (estimated torque), engine RPM of control target (target RPM),
whether the engine is in start mode or not. Then, based on the required output and target RPM, the ECM
calculates a target torque that is to be produced by the engine and compares it with the estimated torque.
ES If the estimated torque is very low compared with the target torque, or the engine start mode continues for
the specific duration calculated by water temperature, an abnormal condition is detected.
DTC No. DTC Detection Condition Trouble Area
PP3190 Following conditions continue at a fixed • Air induction system
engine RPM or a fixed length of time: • Throttle body
• Communication with HV ECU is normal • Fuel pressure
• Engine RPM is a fixed value or more • Engine
• Engine start mode is not active • Mass Air flow meter
• Target torque is a fixed value • Out of fuel
• Ratio of estimated torque against target • Engine coolant temperature sensor
torque is less than 20% • Crankshaft position sensor
• Camshaft position sensor
• ECM
PP3191 Following conditions continue at a fixed • Air induction system
engine RPM or a fixed length of time: • Throttle body
• Communication with HV ECU is normal • Fuel pressure
• Engine RPM is a fixed value or more • Engine
• Engine start mode is not active • Mass Air flow meter
• Out of fuel
• Engine coolant temperature sensor
• Crankshaft position sensor
• Camshaft position sensor
• ECM
PP3193 Following conditions are met: • Out of fuel
• Fuel low level signal input into ECM • ECM
• Detection condition for P3190 or P3191 is
satisfied

MONITOR DESCRIPTION
The ECM and HV control ECU are connected by a communication line called CAN. The ECM sends
information on the engine speed and other data to the HV control ECU while the HV control ECU sends
the information such as a requirement for the engine power to the ECM using the CAN communication
line.
When the communication between the ECM and HV control ECU is normal and the following items
becomes specific condition, the ECM will illuminates the MIL and sets a DTC.
(a) Engine speed
(b) Power switch
(c) Target torque
(d) Ratio of target torque against estimated torque
(e) Fuel level

MONITOR STRATEGY
Related DTCs P3190: Poor engine power
P3191: Engine does not start
P3193: Fuel run out
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–411

Required sensors/components Main sensors: Crankshaft position sensor

Related sensors: HV control ECU
Frequency of operation Continuous
Duration 100 engine revolutions and 6 seconds
MIL operation Immediately
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present None
Fuel cut operation Not operated
Engine speed 750 rpm or more (varies with engine coolant temperature)

ES
TYPICAL MALFUNCTION THRESHOLDS
Case1: P3190
Time for low engine torque 100 engine revolutions or more, or 6 seconds or more
(varies with engine coolant temperature)

Case2: P3191
Engine start no-determination time (receive from HV ECU) 100 engine revolutions or more, and 6 seconds or more
(varies with engine coolant temperature)

Case3: P3193
Time for low engine torque or Engine start no-determination time 100 engine revolutions or more, and 6 seconds or more
(varies with engine coolant temperature)

INSPECTION PROCEDURE
HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when
malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data
from the time the malfunction occurred.

1 CHECK OTHER DTC OUTPUT (IN ADDITION TO DTC P3190, P3191 AND/OR P3193)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the intelligent tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / DTC INFO / CURRENT CODES.
(e) Read DTCs.
Result
Display (DTC output) Proceed to
P3190, P3191 and/or P3193 A
P3190, P3191 and/or P3193, and B
other DTCs

HINT:
If any other codes besides P3190, P3191 and/or P3193
are output, perform troubleshooting for those DTCs first.
B GO TO RELEVANT DTC CHART
 ES–412 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

2 CHECK SHORTAGE OF FUEL

NG REFILL FUEL

OK

3 CHECK AIR INDUCTION SYSTEM

OK:
ES The air induction system has no leakage and
blockages.
NG REPAIR OR REPLACE AIR INDUCTION
SYSTEM

OK

4 CHECK FOR UNUSUAL NOISE OR VIBRATION WHEN STARTING ENGINE OR REVVING

UP

OK:
Unusual noise and vibration do not occur.
NG REPAIR OR REPLACE

OK

5 CHECK FUEL PRESSURE

OK:
Fuel pressure: 304 to 343 kPa (3.1 to 3.5 kgf/cm2, 44 to
50 psi)
NG CHECK AND REPAIR FUEL SYSTEM

OK
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–413

6 INSPECT MASS AIR FLOW METER

(a) Remove the mass air flow meter.

(b) Inspect output voltage.
(1) Apply battery voltage across terminals +B and E2G.
(2) Connect the positive (+) tester probe to terminal VG,
and negative (-) tester probe to terminal E2G.
(3) Blow air into the mass air flow meter, and check that
the voltage fluctuates.
Standard voltage
Tester Connection Specified Condition
3 (VG) - 2 (E2G) Sensor output voltage fluctuates
between 0.3 V and 4.8 V
ES
(c) Inspect resistance.
(1) Measure the resistance between the terminals of
the mass air flow meter.
Standard resistance
Tester Connection Specified Condition
4 (THA) - 5 (E2) 13.6 to 18.4 k at -20 C (-4 F)
4 (THA) - 5 (E2) 2.21 to 2.69 k at 20 C (68 F)
4 (THA) - 5 (E2) 0.49 to 0.67 k at 60 C (140 F)

(d) Reinstall the mass air flow meter.

NG REPLACE MASS AIR FLOW METER

A060548E05

OK
 ES–414 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

7 INSPECT ENGINE COOLANT TEMPERATURE SENSOR

(a) Remove the engine coolant temperature sensor.

(b) Measure the resistance between the terminals of the
engine coolant temperature sensor.
Standard resistance
Tester Connection Specified Condition
1-2 2 to 3 k at 20 C (68 F)
1-2 0.2 to 0.4 k at 80 C (176 F)

NOTICE:
ES When checking the engine coolant temperature sensor in
water, be careful not to allow water to contact the
terminals. After checking, dry the sensor.
HINT:
Alternate procedure: Connect an ohmmeter to the installed
engine coolant temperature sensor and read the resistance.
Use an infrared thermometer to measure the engine
temperature in the immediate vicinity of the sensor. Compare
these values to the resistance/temperature graph. Change
the engine temperature (warm up or allow to cool down) and
repeat the test.
A081700E08 (c) Reinstall the engine coolant temperature sensor.
NG REPLACE ENGINE COOLANT
TEMPERATURE SENSOR

OK

8 INSPECT CRANKSHAFT POSITION SENSOR

(a) Disconnect the C7 crankshaft position sensor connector.

(b) Measure the resistance between the terminals of the
crankshaft position sensor connector.
Standard resistance
Tester Connection Specified Condition
1-2 985 to 1,600 at cold
1-2 1,265 to 1,890 at hot

(c) Reconnect the crankshaft position sensor connector.

A078431E13 NOTICE:
Terms "cold" and "hot" refer to the temperature of
the sensor. "Cold" means approximately -10 to 50 C
(14 to 122 F). "Hot" means approximately 50 to
100 C (122 to 212 F).
NG REPLACE CRANKSHAFT POSITION
SENSOR

OK
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–415

9 INSPECT CAMSHAFT POSITION SENSOR

(a) Disconnect the C1 camshaft position sensor connector.

(b) Measure the resistance between the terminals of
camshaft position sensor connector.
Standard resistance
Tester Connection Specified Condition
1-2 1,630 to 2,740 at cold
1-2 2,065 to 3,225 at hot

(c) Reconnect the camshaft position sensor connector.

A073303E08 NOTICE:
Terms "cold" and "hot" refer to the temperature of
ES
the sensor. "Cold" means approximately -10 to 50 C
(14 to 122 F). "Hot" means approximately 50 to
100 C (122 to 212 F).
NG REPLACE CAMSHAFT POSITION SENSOR

OK

10 INSPECT THROTTLE CONTROL MOTOR

(a) Disconnect the throttle control motor connector.

(b) Using an ohmmeter, measure the motor resistance
between terminals 1 (M-) and 2 (M+).
Standard resistance
Tester Connection Specified Condition
1-2 0.3 to 100 at 20 C (68 F)

NG REPLACE THROTTLE CONTROL MOTOR

A088591E01

OK

11 INSPECT THROTTLE POSITION SENSOR

(a) Disconnect the throttle position sensor connector.

(b) Measure the resistance between the terminals of the
throttle position sensor.
Standard resistance
Tester Connection Specified Condition
1 (VC) - 4 (E2) 1.2 to 3.2 k at 20 C (68 F)
2 (VTA1) - 4 (E2) 1.8 to 10.5 k at 20 C (68 F)
3 (VTA2) - 4 (E2) 1.8 to 10.5 k at 20 C (68 F)

A054410E01

NG REPLACE THROTTLE POSITION SENSOR

 ES–416 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

OK

REPLACE ECM

ES
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–417

DTC U0293 Lost Communication with HV ECU

DESCRIPTION
The Controller Area Network (CAN) is a serial data communication system for real-time application. It is a
multiplex communication system designed for on-vehicle use that provides a superior communication
speed of 500 kbps and a capability to detect malfunction. Through the combination of the CANH and
CANL bus lines, the CAN is able to maintain communication based on differential voltage.
HINT:
• Malfunction in the CAN bus (communication line) can be checked through the DLC3 connector, except
in case of an open circuit in the DLC3 sub bus line.
• DTCs pertaining to CAN communication can be accessed through the use of the intelligent tester II
(with CAN extension module).
• Malfunction in the DLC3 sub bus line cannot be detected through CAN communication, even though ES
the DLC3 connector is connected to CAN communication.
DTC No. DTC Detection Condition Trouble Area
U0293 When communication with HV ECU is • Wire harness
interrupted • HV ECU
• ECM

MONITOR DESCRIPTION
The ECM and the HV control ECU are connected through a set of communication lines on the CAN, in
order to maintain mutual communication. The ECM uses the communication lines to transmit the engine
speed or other pieces of information to the HV control ECU. The HV control ECU transmits signals such
as a engine torque request signal to the ECM.
A few seconds after the power switch is turned ON (IG), the ECM starts checking for any malfunction in
the communication with the HV ECU. If the ECM detects a malfunction in the communication, the ECM
sets a DTC and illuminates the MIL.

MONITOR STRATEGY
Related DTCs U0293: Lost communication with HV ECU
Required sensors/components ECM
Frequency of operation Continuous
Duration 0.68 seconds
MIL operation Immediately
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The monitor will run whenever the following DTCs are not present None
Power switch ON

TYPICAL MALFUNCTION THRESHOLDS

Communication signal No signal from HV ECU

WIRING DIAGRAM
Refer to CAN Communication System (see page CA-4).

INSPECTION PROCEDURE
Refer to CAN Communication System (see page CA-6).
 ES–418 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

HINT:
Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when
malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was
running or stopped, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data
from the time the malfunction occurred.

ES
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–419

ECM Power Source Circuit

DESCRIPTION
The power source circuit of the hybrid system differs from the conventional power source circuit in the
method in which the battery voltage is supplied to IGSW terminal of the ECM. The hybrid system has
adopted one relay to serve as the power switch, which is controlled by the power source control ECU.
When the HV system is turned ON, the power source control ECU actuates the IG2 relay, which applies
the battery voltage to IGSW terminal of the ECM. This causes the MREL terminal to transmit a signal to
the EFI M relay. Then, the current that passes through the contact points of the EFI M relay (which is
actuated by the MREL signal) flows to the +B terminal of the ECM.
When the power switch is turned OFF, the ECM keeps the EFI M relay ON for a maximum of 2 seconds,
in order to initialize the throttle valve.
ES
WIRING DIAGRAM

A127923E01
 ES–420 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

1 CHECK ECM (+B VOLTAGE)

(a) Turn the power switch ON (IG).

(b) Measure the voltage between the specified terminals of
the E5 and E7 ECM connectors.
Standard voltage
Tester Connection Specified Condition
E7-4 (+B) - E5-28 (E1) 9 to 14 V

OK PROCEED TO NEXT CIRCUIT INSPECTION

SHOWN ON PROBLEM SYMPTOMS TABLE
ES A124045E12

NG

2 CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(a) Disconnect the E5 ECM connector.

(b) Measure the resistance between the wire harness side
connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
E5-28 (E1) - Body ground Below 1

(c) Reconnect the ECM connector.

A065745E47
NG REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

3 CHECK ECM (IGSW VOLTAGE)

(a) Turn the power switch ON (IG).

(b) Measure the voltage between the specified terminals of
the E5 and E6 ECM connectors.
Standard voltage
Tester Connection Specified Condition
E6-9 (IGSW) - E5-28 (E1) 9 to 14 V

OK Go to step 7
A124045E13

NG
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–421

4 INSPECT FUSE (IGN FUSE)

(a) Remove the IGN fuse from the driver side junction block.
(b) Measure the resistance of the IGN fuse.
Standard resistance:
Below 1
(c) Reinstall the IGN fuse.
NG CHECK FOR SHORT IN ALL HARNESS AND
COMPONENTS CONNECTED TO FUSE

A082809E01
ES
OK

5 INSPECT INTEGRATION RELAY (IG2 RELAY)

(a) Remove the integration relay from the engine room relay
block.
(b) Inspect the EFI M relay.
Standard resistance
Tester Connection Specified Condition
3K-1 - 3I-4 10 k or higher
3K-1 - 3I-4 Below 1
(Apply battery voltage to terminals
3I-2 and 3I-3)

(c) Reinstall the integration relay.

NG REPLACE INTEGRATION RELAY

A082812E02

OK
 ES–422 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

6 INSPECT FUSE (AM2 FUSE)

(a) Remove the AM2 fuse from the engine room relay block.
(b) Measure the resistance of the AM2 fuse.
Standard resistance:
Below 1
(c) Reinstall the AM2 fuse.
NG CHECK FOR SHORT IN ALL HARNESS AND
COMPONENTS CONNECTED TO FUSE

ES A088628E01

OK

CHECK AND REPAIR HARNESS AND CONNECTOR (BATTERY - IG2 RELAY, IG2 RELAY - ECM)

7 CHECK ECM (MREL VOLTAGE)

(a) Turn the power switch ON (IG).

(b) Measure the voltage between the specified terminals of
the E5 and E7 ECM connectors.
Standard voltage
Tester Connection Specified Condition
E7-7 (MREL) - E5-28 (E1) 9 to 14 V

NG REPLACE ECM
A124045E14

OK

8 INSPECT FUSE (EFI FUSE)

(a) Remove the EFI fuse from the engine room relay block.
(b) Measure the resistance of the EFI fuse.
Standard resistance:
Below 1
(c) Reinstall the EFI fuse.
NG CHECK FOR SHORT IN ALL HARNESS AND
COMPONENTS CONNECTED TO FUSE

A082798E01

OK
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–423

9 INSPECT INTEGRATION RELAY (EFI M RELAY)

(a) Remove the integration relay from the engine room relay
block.
(b) Inspect the EFI M relay.
Standard resistance
Tester Connection Specified Condition
3K-1 - 3I-8 10 k or higher
3K-1 - 3I-8 Below 1
(Apply battery voltage to terminals
3I-6 and 3I-7)

(c) Reinstall the integration relay. ES

NG REPLACE INTEGRATION RELAY

A082812E01

OK

10 CHECK HARNESS AND CONNECTOR (EFI M RELAY - ECM, EFI M RELAY - BODY
GROUND)

(a) Check the harness and connectors between the EFI M

relay and ECM connector.
(1) Remove the integration relay from the engine room
relay block.

A082810E03

(2) Disconnect the E7 ECM connector.

(3) Measure the resistance between the wire harness
side connectors.
Standard resistance (Check for open)
Tester Connection Specified Condition
3I-6 (EFI M relay) - E7-7 (MREL) Below 1

Standard resistance (Check for short)

Tester Connection Specified Condition
A065744E39
3I-6 (EFI M relay) or E7-7 (MREL) - 10 k or higher
Body ground

(4) Reinstall the integration relay.

 ES–424 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

(5) Reconnect the ECM connector.

(b) Check the harness and the connectors between the EFI
M relay and the body ground.
(1) Remove the integration relay from the engine room
relay block.
(2) Measure the resistance between the wire harness
side connector and the body ground.
Standard resistance (Check for open)
Tester Connection Specified Condition
3I-7 (EFI M relay) - Body ground Below 1

(3) Reinstall the integration relay.

ES NG REPAIR OR REPLACE HARNESS AND

CONNECTOR

OK

CHECK AND REPAIR HARNESS AND CONNECTOR (TERMINAL +B OF ECM - BATTERY

POSITIVE TERMINAL)
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–425

VC Output Circuit
DESCRIPTION
The VC voltage (5 V) is generated in the ECM. The voltage is used to supply power to the throttle position
sensor, canister pump module, etc.

ES
 ES–426 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

WIRING DIAGRAM

ES

A128755E01
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–427

INSPECTION PROCEDURE

1 CHECK MIL

(a) Check that MIL (Malfunction Indicator Lamp) lights up

when turning the power switch ON (IG).
OK:
MIL lights up
OK SYSTEM IS OK

NG

ES
2 CHECK CONNECTION BETWEEN INTELLIGENT TESTER AND ECM

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG) and turn the intelligent
tester ON.
(c) Check the connection between the intelligent tester and
ECM.
Result
Condition Proceed to
Communication is possible A
Communication is not possible B

A GO TO MIL CIRCUIT

3 CHECK ECM (VC VOLTAGE)

(a) Turn the power switch ON (IG).

(b) Measure the voltage of the ECM connector.
Standard voltage
Tester Connection Proceed to
E4-18 (VC) - E5-28 (E1) Voltage is not 5 V

A119979E47

NEXT

4 CHECK MIL (THROTTLE POSITION SENSOR)

(a) Disconnect the T3 throttle body connector.

(b) Turn the power switch ON (IG).
(c) Check the MIL.
 ES–428 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

Result
Condition Proceed to
MIL illuminates A
MIL does not illuminate B

A REPLACE THROTTLE BODY

5 CHECK MIL (WATER VALVE)

(a) Disconnect the W5 water valve connector.

ES (b) Turn the power switch ON (IG).
(c) Check the MIL.
Result
Condition Proceed to
MIL illuminates A
MIL does not illuminate B

A REPLACE WATER VALVE

6 CHECK MIL (CANISTER PUMP MODULE)

(a) Disconnect the V7 canister pump module connector.

(b) Turn the power switch ON (IG).
(c) Check the MIL.
Result
Condition Proceed to
MIL illuminates A
MIL does not illuminate B

A REPLACE CHARCOAL CANISTER

ASSEMBLY

7 CHECK MIL (VAPOR PRESSURE SENSOR)

(a) Disconnect the V6 vapor pressure sensor connector.

(b) Turn the power switch ON (IG).
(c) Check the MIL.
Result
Condition Proceed to
MIL illuminates A
MIL does not illuminate B

A REPLACE VAPOR PRESSURE SENSOR

 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–429

8 CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)

(a) Disconnect the T3 throttle body connector.

(b) Disconnect the W5 water valve connector.
(c) Disconnect the V7 canister pump module connector.
(d) Disconnect the V6 vapor pressure sensor connector.
(e) Disconnect the E4 ECM connector.
(f) Measure the resistance of the wire harness side
connector.
Standard resistance
Tester Connection Specified Condition
ES
A065743E90
E4-18 (VC) - Body ground 10 k or higher

NG REPAIR OR REPLACE HARNESS AND

CONNECTOR

OK

REPLACE ECM
 ES–430 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

Fuel Pump Control Circuit

DESCRIPTION
The fuel pump is operated by the ECM according to the vehicle running condition. After the ECM receives
the engine start requirement signal from the HV control ECU, an NE signal comes in immediately when
the engine is cranked by MG1 (basically, the fuel pump can operate while the NE signal is generated).
The ECM grounds the FC terminal line after receiving NE signal. It causes to energize the coil in the
circuit opening relay, and the current flows to the fuel pump.
When the signal to stop the engine comes from the HV control ECU to the ECM, or when the fuel cut
operation is performed such as decelerating by the engine brake, the fuel pump is stopped.

ES
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–431

WIRING DIAGRAM

ES

A127924E01
 ES–432 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

INSPECTION PROCEDURE

1 PERFORM ACTIVE TEST BY INTELLIGENT TESTER (OPERATE CIRCUIT OPENING

RELAY)

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power switch ON (IG).
(c) Turn the tester ON.
(d) Enter the following menus: DIAGNOSIS / ENHANCED
OBD II / ACTIVE TEST / FUEL PUMP / SPD.
(e) Check the relay operation while operating it with the
tester.
ES OK:
Operating noise can be heard from the relay.
OK PROCEED TO NEXT CIRCUIT INSPECTION
SHOWN IN PROBLEMS TABLE

NG

2 INSPECT POWER SOURCE CIRCUIT

NG REPAIR OR REPLACE POWER SOURCE

CIRCUIT COMPONENTS

OK

3 INSPECT INTEGRATION RELAY (C/OPN RELAY)

(a) Remove the integration relay from the engine room relay
block.
(b) Inspect the circuit opening relay.
Standard resistance
Tester Connection Specified Condition
3G-5 - 3G-8 10 k or higher
3G-5 - 3G-8 Below 1
(Apply battery voltage to terminals
3G-6 and 3G-7)

(c) Reinstall the integration relay.

NG REPLACE INTEGRATION RELAY

A082815E01
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–433

OK

4 CHECK ECM (FC VOLTAGE)

(a) Turn the power switch ON (IG).

(b) Measure the voltage between the specified terminals of
the E5 and E6 ECM connectors.
Standard voltage
Tester Connection Specified Condition
E6-10 (FC) - E5-28 (E1) 9 to 14 V

GO Go to step 5 ES
A124045E15

NG

CHECK AND REPAIR HARNESS AND CONNECTOR

5 INSPECT FUEL PUMP

(a) Disconnect the F14 fuel pump connector.

(b) Inspect the fuel pump resistance.
(1) Measure the resistance between terminals 3 and 7.
Standard resistance
Tester Connection Specified Condition
3-7 0.2 to 3.0 at 20 C (68 F)

(c) Inspect the fuel pump operation.

(1) Apply battery voltage to the fuel pump terminals.
A082833E03 Check that the pump operates.
NOTICE:
• These tests must be done quickly (within 10 seconds)
to prevent the coil from burning out.
• Keep fuel pump as far away from the battery as
possible.
• Always do the switching at the battery side.
(d) Reconnect the fuel pump connector.
NG REPAIR OR REPLACE FUEL TANK
ASSEMBLY

OK
 ES–434 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

6 CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP, FUEL PUMP - BODY
GROUND)

(a) Check the harness and the connectors between the

circuit opening relay and the fuel pump connector.
(1) Remove the integration relay from the engine room
relay block.
(2) Disconnect the F14 fuel pump connector.
(3) Measure the resistance between the wire harness
side connectors.
Standard resistance (Check for open)

ES A082811E01
Tester Connection
3G-8 (Circuit opening relay) - F14-3
Specified Condition
Below 1
(Fuel pump)

Standard resistance (Check for short)

Tester Connection Specified Condition
3G-8 (Circuit opening relay ) or F14-3 10 k or higher
(Fuel pump) - Body ground

(4) Reinstall the integration relay.

(5) Reconnect the fuel pump connector.
(b) Check the harness and the connectors between the fuel
pump connector and the body ground.
(1) Disconnect the F14 fuel pump connector.
(2) Measure the resistance between the wire harness
side connector and the body ground.
Standard resistance (Check for open)
Tester Connection Specified Condition
F14-7 (Fuel pump) - Body ground Below 1

A082834E01 (3) Reconnect the fuel pump connector.

NG REPAIR OR REPLACE HARNESS AND
CONNECTOR

OK

REPLACE ECM
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–435

MIL Circuit
DESCRIPTION
The IG2 relay energized by the power source control ECU applies the battery voltage to the malfunction
indicator lamp (MIL) in the combination meter while the main system is turned ON.
When it is necessary, the ECM grounds the W terminal line and illuminates the MIL.
In order to perform functional check visually, the MIL is illuminated when the power switch is first turned
ON (IG).
If the MIL is ON or OFF all of the time, use the procedure below to troubleshoot it. The MIL is used to
indicate vehicle malfunction which was detected by the ECM. Follow this procedure using the intelligent
tester or the OBD II scan tool to determine cause of the problem and to check the MIL.

ES
 ES–436 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

WIRING DIAGRAM

ES

A127925E02
 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM ES–437

INSPECTION PROCEDURE

1 CHECK MIL CONDITION

(a) Perform troubleshooting in accordance with the chart

below.
Result
Condition Proceed to
MIL remains ON A
MIL does not illuminate B

B Go to step 4
ES
A

2 CLEAR DTC

(a) Connect the intelligent tester to the DLC3.

(b) Turn the power ON (IG).
(c) Turn the tester ON.
(d) Read DTCs (see page ES-29).
(e) Clear the DTCs (see page ES-29).
(f) Check the MIL is not illuminated.
OK:
MIL is not illuminated.
OK REPAIR CIRCUITS INDICATED BY OUTPUT
DTCS

NG

3 CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)

(a) Disconnect the E6 ECM connector.

(b) Turn the power switch ON (IG).
(c) Check the MIL is not illuminated.
OK:
MIL is not illuminated.
(d) Reconnect the ECM connector.
OK REPLACE ECM

A065748E33

NG

CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER - ECM)

 ES–438 1NZ-FXE ENGINE CONTROL SYSTEM – SFI SYSTEM

4 CHECK THAT MIL IS ILLUMINATED

(a) Check that MIL is illuminated when the power switch is

turned ON (IG).
Standard:
MIL is illuminated.
OK SYSTEM OK

NG

ES 5 CHECK THAT ENGINE STARTS

(a) Turn the power switch to ON (IG).

(b) Start the engine.
Result
Result Proceed To
Engine starts A
Engine does not start* B

HINT:
*: The intelligent tester cannot communicate with the
ECM.
B GO TO VC OUTPUT CIRCUIT

6 INSPECT COMBINATION METER ECU (MIL CIRCUIT)

(a) See the combination meter troubleshooting (see page

ME-11).
NG REPAIR OR REPLACE BULB OR
COMBINATION METER ASSEMBLY

OK

CHECK AND REPAIR HARNESS AND CONNECTOR (COMBINATION METER - ECM)

 ES–432 1NZ-FXE ENGINE CONTROL SYSTEM – MASS AIR FLOW METER

MASS AIR FLOW METER

1NZ-FXE ENGINE CONTROL SYSTEM
ENGINE

COMPONENTS

ES

A112275E01
1NZ-FXE ENGINE CONTROL SYSTEM – MASS AIR FLOW METER ES–433

ON-VEHICLE INSPECTION
NOTICE:
• Perform the MAF meter inspection according to the
procedures below.
• Only replace the MAF meter when both the LONG
FT#1 value and MAF value in the DATA LIST (with the
engine stopped) are not within the normal operating
range.
1. CHECK MASS AIR FLOW METER
(a) Perform confirmation driving pattern.
(1) Connect the intelligent tester to the DLC3.
(2) Turn the power switch ON.
(3) Turn the intelligent tester ON. ES
(4) Clear the DTCs (see page ES-29).
(5) Start the engine and warm it up with all
accessory switches OFF (until the engine
coolant temperature is 75 C (167 F) or more).
A087542E04 (6) Drive the vehicle at 50 km/h (31 mph) or more
for 3 minutes or more*1.
(7) Let the engine to idle (accelerator pedal fully
released) for 2 minutes or more*2.
(8) Perform steps *1 and *2 at least 3 times.

A116436E07

(b) Read value using intelligent tester (LONG FT#1).

(1) Enter the following menus: Powertrain / Engine
and ECT / Data List / Long FT#1.
(2) Read the values displayed on the tester.
Standard value:
Within -15 to +15 %
If the result is not within the specified range,
perform the inspection below.
 ES–434 1NZ-FXE ENGINE CONTROL SYSTEM – MASS AIR FLOW METER

(c) Read value using intelligent tester (MAF).

NOTICE:
• Turn off the engine.
• Perform the inspection with the vehicle
indoors and on a level surface.
• Perform the inspection of the MAF meter
while it is installed to the air cleaner case
(installed to the vehicle).
• During the test, do not use the exhaust air
duct to perform suction on the exhaust pipe.
(1) Turn the power switch ON (ACC).
(2) Turn the power switch ON (do not start the
engine).
ES (3) Turn the intelligent tester ON.
(4) Enter the following menus: Powertrain / Engine
and ECT / Data List / MAF.
(5) Wait 30 seconds, and read the values on the
intelligent tester.
Standard condition:
Less than 0.07 g/sec.
• If the result is not as specified, replace the
MAF meter.
• If the result is within the specified range,
inspect the cause of the extremely rich or
lean air fuel ratio (see page ES-128).
1NZ-FXE ENGINE CONTROL SYSTEM – MASS AIR FLOW METER ES–435

REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. REMOVE RADIATOR SUPPORT OPENING COVER
(See page ES-450)
3. REMOVE MASS AIR FLOW METER
(a) Disconnect the MAF meter connector.
(b) Remove the 2 screws and MAF meter.
ES

A087413E01

INSTALLATION
1. INSTALL MASS AIR FLOW METER
(a) Install a new O-ring to the MAF meter.
(b) Install the MAF meter with the 2 screws.
(c) Connect the MAF meter connector.
2. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
3. INSTALL RADIATOR SUPPORT OPENING COVER
A087413E01
(See page ES-454)
4. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
Certain systems need to be initialized after
disconnecting and reconnecting the cable from
the negative (-) battery terminal.
 1NZ-FXE ENGINE CONTROL SYSTEM – CAMSHAFT TIMING OIL CONTROL VALVE
ES–436 ASSEMBLY

CAMSHAFT TIMING OIL CONTROL VALVE ASSEMBLY

1NZ-FXE ENGINE CONTROL SYSTEM
ENGINE

COMPONENTS

ES

A112276E01
1NZ-FXE ENGINE CONTROL SYSTEM – CAMSHAFT TIMING OIL CONTROL VALVE
ASSEMBLY ES–437

REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. REMOVE RADIATOR SUPPORT OPENING COVER
(See page ES-450)
3. REMOVE AIR CLEANER ASSEMBLY (See page ES-
450)
4. REMOVE CAMSHAFT TIMING OIL CONTROL VALVE
ASSEMBLY
ES
(a) Disconnect the camshaft timing oil control valve
connector.
(b) Remove the bolt and camshaft timing oil control
valve.

A087587E01
 1NZ-FXE ENGINE CONTROL SYSTEM – CAMSHAFT TIMING OIL CONTROL VALVE
ES–438 ASSEMBLY

INSPECTION
1. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE
ASSEMBLY
(a) Measure the resistance of the oil control valve.
Standard resistance:
6.9 to 7.9 at 20 C (68 F)
If the result is not as specified, replace the camshaft
timing oil control valve assembly.
(b) Inspect the operation.
(1) Connect the battery positive (+) lead to terminal
1 and negative (-) lead to terminal 2, and
inspect the movement of the valve.
ES Specified condition
Condition Specified Condition
Battery positive (+) voltage is applied Valve moves in black arrow direction
shown in illustration
Battery positive (+) voltage is cut off Valve moves in white arrow direction
A050377E02 shown in illustration

If the result is not as specified, replace the

camshaft timing oil control valve assembly.
NOTICE:
Confirm that the valve moves freely and is
not stuck in any position.
HINT:
Foreign objects in the oil can cause subtle
pressure leaks in the valve. The pressure leaks
will cause the cam to advance. This condition
will usually set a DTC.
INSTALLATION
1. INSTALL CAMSHAFT TIMING OIL CONTROL VALVE
ASSEMBLY
(a) Apply a light coat of engine oil to a new O-ring, then
install it to the camshaft timing oil control valve.
(b) Install the camshaft timing oil control valve with the
bolt.
Torque: 7.5 N*m (76 kgf*cm, 66 in.*lbf)
A087549E02
NOTICE:
Be careful that the O-ring is not cracked or
jammed when installing it.
(c) Connect the camshaft timing oil control valve
connector.
2. INSTALL AIR CLEANER ASSEMBLY (See page ES-
453)
3. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
4. CHECK FOR ENGINE OIL LEAKS
5. INSTALL RADIATOR SUPPORT OPENING COVER
(See page ES-454)
1NZ-FXE ENGINE CONTROL SYSTEM – CAMSHAFT TIMING OIL CONTROL VALVE
ASSEMBLY ES–439

6. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
Certain systems need to be initialized after
disconnecting and reconnecting the cable from
the negative (-) battery terminal.

ES
 1NZ-FXE ENGINE CONTROL SYSTEM – CAMSHAFT POSITION SENSOR ES–439

CAMSHAFT POSITION SENSOR

1NZ-FXE ENGINE CONTROL SYSTEM
ENGINE

COMPONENTS

ES

A112339E01
 ES–440 1NZ-FXE ENGINE CONTROL SYSTEM – CAMSHAFT POSITION SENSOR

REMOVAL
1. REMOVE RADIATOR SUPPORT OPENING COVER
(See page ES-450)
2. REMOVE ENGINE UNDER COVER LH
3. REMOVE ENGINE UNDER COVER RH
4. DRAIN ENGINE COOLANT (See page CO-6)
5. DRAIN HV COOLANT (See page HX-58)
6. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
ES Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
7. REMOVE INVERTER WITH CONVERTER
(a) Remove the inverter with converter (see page HV-
530).
8. REMOVE CAMSHAFT POSITION SENSOR
(a) Disconnect the sensor connector.
(b) Remove the bolt and sensor.
INSPECTION
1. INSPECT CAMSHAFT POSITION SENSOR
(a) Measure the resistance of the sensor.
Standard resistance
Tester Connection Condition Specified Condition
1-2 Cold 1,630 to 2,740
1-2 Hot 2,065 to 3,225

A073303E09
NOTICE:
The terms "Cold" and "Hot" refer to the
temperature of the sensor. "Cold" means
approximately -10 to 50 C (14 to 122 F). "Hot"
means approximately 50 to 100 C (122 to 212 F).
If the result is not as specified, replace the camshaft
position sensor.
1NZ-FXE ENGINE CONTROL SYSTEM – CAMSHAFT POSITION SENSOR ES–441

INSTALLATION
1. INSTALL CAMSHAFT POSITION SENSOR
(a) Install the sensor with the bolt.
Torque: 7.5 N*m (76 kgf*cm, 66 in.*lbf)
(b) Connect the sensor connector.
2. INSTALL INVERTER WITH CONVERTER
(a) Install the inverter with converter (see page HV-
535).
3. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
4. ADD HV COOLANT (See page HX-58)
5. ADD ENGINE COOLANT (See page CO-7) ES
6. CHECK FOR ENGINE COOLANT LEAKS (See page
CO-2)
7. CHECK FOR HV COOLANT LEAKS
8. INSTALL RADIATOR SUPPORT OPENING COVER
(See page ES-454)
9. INSTALL ENGINE UNDER COVER RH
10. INSTALL ENGINE UNDER COVER LH
11. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
Certain systems need to be initialized after
disconnecting and reconnecting the cable from
the negative (-) battery terminal.
 ES–442 1NZ-FXE ENGINE CONTROL SYSTEM – CRANKSHAFT POSITION SENSOR

CRANKSHAFT POSITION SENSOR

1NZ-FXE ENGINE CONTROL SYSTEM
ENGINE

COMPONENTS

ES

A112274E01
1NZ-FXE ENGINE CONTROL SYSTEM – CRANKSHAFT POSITION SENSOR ES–443

REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. REMOVE ENGINE UNDER COVER RH
3. REMOVE CRANKSHAFT POSITION SENSOR
(a) Disconnect the sensor connector.
(b) Remove the bolt and sensor.
INSPECTION ES
1. INSPECT CRANKSHAFT POSITION SENSOR
(a) Measure the resistance of the sensor.
Standard resistance
Tester Connection Condition Specified Condition
1-2 Cold 985 to 1,600
1-2 Hot 1,265 to 1,890

A078431E11
NOTICE:
The terms "Cold" and "Hot" refer to the
temperature of the sensor. "Cold" means
approximately -10 to 50 C (14 to 122 F). "Hot"
means approximately 50 to 100 C (122 to 212 F).
If the result is not as specified, replace the
crankshaft position sensor.
 ES–444 1NZ-FXE ENGINE CONTROL SYSTEM – CRANKSHAFT POSITION SENSOR

INSTALLATION
1. INSTALL CRANKSHAFT POSITION SENSOR
(a) Install the sensor with the bolt.
Torque: 7.5 N*m (76 kgf*cm, 66 in.*lbf)
(b) Connect the sensor connector.
2. INSTALL ENGINE UNDER COVER RH
3. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
4. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
ES Certain systems need to be initialized after
disconnecting and reconnecting the cable from
the negative (-) battery terminal.
 ES–444 1NZ-FXE ENGINE CONTROL SYSTEM – ENGINE COOLANT TEMPERATURE SENSOR

ENGINE COOLANT TEMPERATURE SENSOR

1NZ-FXE ENGINE CONTROL SYSTEM
ENGINE

COMPONENTS

ES

A112277E01
1NZ-FXE ENGINE CONTROL SYSTEM – ENGINE COOLANT TEMPERATURE SENSOR ES–445

REMOVAL
CAUTION:
The hybrid system uses high voltage circuits, so
improper handling could cause an electric shock or
leakage. During servicing (e.g. installing or removing the
parts, replacing the parts), be sure to follow the
procedures below.
1. REMOVE RADIATOR SUPPORT OPENING COVER
(See page ES-450)
2. REMOVE ENGINE UNDER COVER LH
3. REMOVE ENGINE UNDER COVER RH
4. DRAIN ENGINE COOLANT (See page CO-6) ES
5. DRAIN HV COOLANT (See page HX-58)
6. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
7. REMOVE INVERTER WITH CONVERTER
(a) Remove the inverter with converter (see page HV-
530).
8. REMOVE ENGINE COOLANT TEMPERATURE
SENSOR
(a) Disconnect the sensor connector.
(b) Using a 19 mm deep socket wrench, remove the
sensor and gasket.

A087601E02
 ES–446 1NZ-FXE ENGINE CONTROL SYSTEM – ENGINE COOLANT TEMPERATURE SENSOR

INSPECTION
1. INSPECT ENGINE COOLANT TEMPERATURE
SENSOR
(a) Measure the resistance of the sensor.
Standard resistance
Tester Connection Condition Specified Condition
1-2 20 C (68 F) 2.32 to 2.59 k
1-2 80 C (176 F) 0.310 to 0.326 k

NOTICE:
If checking the sensor in water, be careful not to
allow water to contact the terminals. After
ES checking, dry the sensor.

A114177E01

If the result is not as specified, replace the engine

coolant temperature sensor.
INSTALLATION
1. INSTALL ENGINE COOLANT TEMPERATURE
SENSOR
(a) Using a 19 mm deep socket wrench, install a new
gasket and the sensor.
Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf)
(b) Connect the sensor connector.
2. INSTALL INVERTER WITH CONVERTER
A087601E02 (a) Install the inverter with converter (see page HV-
535).
3. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
4. ADD ENGINE COOLANT (See page CO-7)
5. ADD HV COOLANT (See page HX-58)
1NZ-FXE ENGINE CONTROL SYSTEM – ENGINE COOLANT TEMPERATURE SENSOR ES–447

6. CHECK FOR ENGINE COOLANT LEAKS (See page

CO-2)
7. CHECK FOR HV COOLANT LEAKS
8. INSTALL ENGINE UNDER COVER RH
9. INSTALL ENGINE UNDER COVER LH
10. INSTALL RADIATOR SUPPORT OPENING COVER
(See page ES-454)
11. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
Certain systems need to be initialized after
disconnecting and reconnecting the cable from ES
the negative (-) battery terminal.
 ES–448 1NZ-FXE ENGINE CONTROL SYSTEM – THROTTLE BODY

THROTTLE BODY
1NZ-FXE ENGINE CONTROL SYSTEM
ENGINE

COMPONENTS

ES

A112278E01
1NZ-FXE ENGINE CONTROL SYSTEM – THROTTLE BODY ES–449

ES

A112279E01
 ES–450 1NZ-FXE ENGINE CONTROL SYSTEM – THROTTLE BODY

REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. REMOVE ENGINE UNDER COVER LH
3. DRAIN ENGINE COOLANT (See page CO-6)
4. REMOVE RADIATOR SUPPORT OPENING COVER
(a) Remove the 6 clips and radiator support opening
ES cover.

A087414E01

5. REMOVE AIR CLEANER ASSEMBLY

(a) Disconnect the MAF meter connector.
(b) Disconnect the wire harness from the wire harness
clamp.
(c) Loosen the hose clamp bolt, and then disconnect
the No. 1 air cleaner inlet.

A087415E01

(d) Remove the 2 bolts.

(e) Loosen the hose clamp bolt, and then remove the
air cleaner.

A087416E02

6. REMOVE THROTTLE BODY ASSEMBLY WITH

MOTOR
(a) Disconnect the ventilation hose.
(b) Disconnect the No. 2 ventilation hose.
(c) Disconnect the No. 1 fuel vapor feed hose.

A087573E01
1NZ-FXE ENGINE CONTROL SYSTEM – THROTTLE BODY ES–451

(d) Disconnect the water by-pass hose.

(e) Disconnect the No. 2 water by-pass hose.

A087574E01

(f) Disconnect the throttle control motor connector.

(g) Disconnect the throttle position sensor connector.
ES

A087575E01

(h) Remove the bolt, 2 nuts and throttle with motor

body.

A087576E01

(i) Remove the gasket from the intake manifold.

A087577E02
 ES–452 1NZ-FXE ENGINE CONTROL SYSTEM – THROTTLE BODY

INSPECTION
1. INSPECT THROTTLE WITH MOTOR BODY
ASSEMBLY
(a) Check the appearance.
(1) Check that the throttle valve shaft does not
rattle.
(2) Check that each port is not clogged.
(3) Check that the throttle valve opens and closes
smoothly.
(4) Check that there is no clearance between the
throttle stop screw and lever when the throttle
valve is fully closed.
ES NOTICE:
Do not adjust the throttle stop screw.

A088226E01

(b) Inspect the resistance of the throttle control motor.

(1) Using an ohmmeter, measure the resistance
between the terminals.
Standard resistance:
50 M or more at 25 C (77 F)
If the resistance is not as specified, replace the
throttle with motor body.

A087470E02

(c) Inspect the resistance of the throttle position sensor.

(1) Using an ohmmeter, measure the resistance
between terminals 1 and 4.
Standard resistance:
1.2 to 3.5 k at 25 C (77 F)
If the resistance is not as specified, replace the
throttle with motor body.

A114365

INSTALLATION
1. INSTALL THROTTLE BODY ASSEMBLY WITH
MOTOR
(a) Install a new gasket to the intake manifold.

A087577E02
1NZ-FXE ENGINE CONTROL SYSTEM – THROTTLE BODY ES–453

(b) Install the throttle with motor body with the bolt and
2 nuts.
Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf)

A087576E01

(c) Connect the throttle position sensor connector.

(d) Connect the throttle control motor connector.
ES

A087575E01

(e) Connect the No. 2 water by-pass hose.

(f) Connect the water by-pass hose.

A087574E01

(g) Connect the No. 1 fuel vapor feed hose.

(h) Connect the No. 2 ventilation hose.
(i) Connect the ventilation hose.

A087573E01

2. INSTALL AIR CLEANER ASSEMBLY

(a) Install the air cleaner with the 2 bolts.
Torque: 7.0 N*m (71 kgf*cm, 62 in.*lbf)
(b) Tighten the hose clamp bolt.
Torque: 3.0 N*m (31 kgf*cm, 27 in.*lbf)
(c) Connect the No. 1 air cleaner inlet, and tighten the
hose clamp bolt.
Torque: 3.0 N*m (31 kgf*cm, 27 in.*lbf)
(d) Connect the MAF meter connector.
A087416E02
 ES–454 1NZ-FXE ENGINE CONTROL SYSTEM – THROTTLE BODY

3. CONNECT CABLE TO NEGATIVE BATTERY

TERMINAL
4. ADD ENGINE COOLANT (See page CO-7)
5. CHECK FOR ENGINE COOLANT LEAKS (See page
CO-2)
6. INSTALL ENGINE UNDER COVER LH
7. INSTALL RADIATOR SUPPORT OPENING COVER
(a) Install the cover with the 6 clips.
8. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
ES Certain systems need to be initialized after
disconnecting and reconnecting the cable from
the negative (-) battery terminal.
A087414E01
 1NZ-FXE ENGINE CONTROL SYSTEM – KNOCK SENSOR ES–455

KNOCK SENSOR
1NZ-FXE ENGINE CONTROL SYSTEM
ENGINE

COMPONENTS

ES

A112278E02
 ES–456 1NZ-FXE ENGINE CONTROL SYSTEM – KNOCK SENSOR

ES

A112281E01
1NZ-FXE ENGINE CONTROL SYSTEM – KNOCK SENSOR ES–457

REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. REMOVE RADIATOR SUPPORT OPENING COVER
(See page ES-450)
3. REMOVE ENGINE UNDER COVER LH
4. DRAIN ENGINE COOLANT (See page CO-6)
5. REMOVE AIR CLEANER ASSEMBLY (See page ES- ES
450)
6. REMOVE OIL DIPSTICK GUIDE
(a) Remove the dipstick.
(b) Disconnect the wire harness clamp.
(c) Remove the bolt and dipstick guide.

A087582E01

7. REMOVE INTAKE MANIFOLD SUB-ASSEMBLY

(a) Disconnect the ventilation hose from the throttle
with motor body.
(b) Disconnect the No. 2 ventilation hose.
(c) Disconnect the No. 1 fuel vapor feed hose.

A087573E01

(d) Disconnect the water by-pass hose.

(e) Disconnect the No. 2 water by-pass hose.

A087574E01
 ES–458 1NZ-FXE ENGINE CONTROL SYSTEM – KNOCK SENSOR

(f) Disconnect the throttle control motor connector.

(g) Disconnect the throttle position sensor connector.

A087575E01

(h) Disconnect the 3 wire harness clamps.

(i) Disconnect the connector clamp.
ES (j) Remove the bolt and harness clamp bracket.

A087583E01

(k) Remove the No. 1 fuel vapor feed hose from the
hose clamp.
(l) Remove the 3 bolts, 2 nuts and intake manifold.

A087584E01

(m) Remove the gasket from the cylinder head.

A087585E01
 1NZ-FXE ENGINE CONTROL SYSTEM – KNOCK SENSOR ES–459

8. REMOVE KNOCK SENSOR

(a) Disconnect the knock sensor connector.
(b) Remove the nut and sensor.

A087586E01

INSPECTION
1. INSPECT KNOCK SENSOR
(a) Measure the resistance of the sensor. ES
Standard resistance:
120 to 280 k at 20 C (68 F)
If the result is not as specified, replace the knock
sensor.
• A flat type knock sensor (non-resonant type) has
A065174E05
a structure that can detect vibrations between
approximately 6 kHz and 15 kHz.
• Knock sensors are fitted onto the engine block to
detect engine knocking.
• The knock sensor contains a piezoelectric
element which generates a voltage when it
becomes deformed. The voltage is generated
when the engine block vibrates due to knocking.
Any occurrence of engine knocking can be
suppressed by delaying the ignition timing.
DTC No. DTC Detection Condition Trouble Area
P0327 Output voltage of knock sensor is 0.5 V or • Short in knock sensor circuit
less • Knock sensor
(1 trip detection logic) • ECM
P0328 Output voltage of knock sensor is 4.5 V or • Open in knock sensor circuit
more • Knock sensor
(1 trip detection logic) • ECM

HINT:
When either of the DTCs P0327 and P0328 are set,
the ECM enters fail-safe mode. During fail-safe
mode, the power timing is delayed to its maximum
retardation. Fail-safe mode continues until the
power switch OFF.
Reference: Inspection using an oscilloscope.
The correct waveform is shown.
Items Contents
Terminals KNK1 - EKNK
Equipment Settings 0.01 to 10 V/Division, 0.01 to 10 msec./
Division
Conditions Keep engine speed at 4,000 rpm with
warm engine

A085286E13
 ES–460 1NZ-FXE ENGINE CONTROL SYSTEM – KNOCK SENSOR

INSTALLATION
1. INSTALL KNOCK SENSOR
(a) Install the knock sensor with the nut.
Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf)
NOTICE:
Be careful to install the knock sensor in the
correct direction.
(b) Connect the knock sensor connector.
A093710E01

2. INSTALL INTAKE MANIFOLD

(a) Install a new gasket to the cylinder head.
ES

A087585E01

(b) Install the intake manifold with the 3 bolts and 2

nuts.
Torque: 20 N*m (204 kgf*cm, 15 ft.*lbf)
(c) Install the No. 1 fuel vapor feed hose to the hose
clamp.

A087584E01

(d) Install the harness clamp bracket with the bolt.

Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf)
(e) Install the connector clamp.
(f) Install the 3 wire harness clamps.

A087583E01
1NZ-FXE ENGINE CONTROL SYSTEM – KNOCK SENSOR ES–461

(g) Connect the throttle position sensor connector.

(h) Connect the throttle control motor connector.

A087575E01

(i) Connect the No. 2 water by-pass hose.

(j) Connect the water by-pass hose.
ES

A087574E01

(k) Connect the No. 1 fuel vapor feed hose.

(l) Connect the No. 2 ventilation hose.
(m) Connect the ventilation hose.

A087573E01

3. INSTALL OIL DIPSTICK GUIDE

(a) Apply a light coat of engine oil to a new O-ring and
install it to the dipstick guide.

A087556E02

(b) Install the dipstick guide with the bolt.

Torque: 9.0 N*m (92 kgf*cm, 80 in.*lbf)
NOTICE:
Be careful that the O-ring is not cracked or
jammed when installing it.
(c) Connect the wire harness clamp.
(d) Install the dipstick.
4. INSTALL AIR CLEANER ASSEMBLY (See page ES-
453)
A087582E01
 ES–462 1NZ-FXE ENGINE CONTROL SYSTEM – KNOCK SENSOR

5. CONNECT CABLE TO NEGATIVE BATTERY

TERMINAL
6. ADD ENGINE COOLANT (See page CO-7)
7. CHECK FOR ENGINE COOLANT LEAKS (See page
CO-2)
8. INSTALL ENGINE UNDER COVER LH
9. INSTALL RADIATOR SUPPORT OPENING COVER
(See page ES-454)
10. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
ES Certain systems need to be initialized after
disconnecting and reconnecting the cable from
the negative (-) battery terminal.
1NZ-FXE ENGINE CONTROL SYSTEM – EFI RELAY ES–463

EFI RELAY
ON-VEHICLE INSPECTION
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. INSPECT INTEGRATION RELAY (UNIT B: EFI RELAY
M RELAY)
NOTICE:
• The EFI relay is built into the integration relay ES
(unit B: EFI MAIN).
• Some relays are built into the integration relay.
The integration relay cannot be disassembled. If
there is a malfunction in the circuit of the
integration relay, replace the integration relay.
(a) Using a screwdriver, detach the 2 claws and
disconnect the integration relay from the engine
room No. 1 junction block.
HINT:
Tape the screwdriver tip before use.
(b) Disconnect the 3 connectors from the integration
relay.

A135397

(c) Measure the resistance between the terminals.

Standard resistance
Tester Connection Specified Condition
3I-5 - 3I-8 10 k or higher
3I-5 - 3I-8 Below 1
(when battery voltage is applied to
terminals 3I-6 and 3I-7)

If the result is not as specified, replace the

integration relay.
(d) Connect the 3 connectors to the integration relay.
(e) Install the integration relay to the engine room No. 1
junction block.
3. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
4. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
Certain system need to be initialized after
disconnecting and reconnecting the cable from
A114366E01
the negative (-) battery terminal.
 ES–464 1NZ-FXE ENGINE CONTROL SYSTEM – CIRCUIT OPENING RELAY

CIRCUIT OPENING RELAY

ON-VEHICLE INSPECTION
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. INSPECT INTEGRATION RELAY (UNIT C: C/OPN
RELAY)
NOTICE:
ES • The EFI relay is built into the integration relay
(unit C: C/OPN RELAY).
• Some relays are built into the integration relay.
The integration relay cannot be disassembled. If
there is a malfunction in the circuit of the
integration relay, replace the integration relay.
(a) Using a screwdriver, detach the 2 claws and
disconnect the integration relay from the No. 1
engine room junction block.
HINT:
Tape the screwdriver tip before use.
(b) Disconnect the 2 connectors from the integration
relay.

A135397

(c) Measure the resistance between the terminals.

Standard resistance
Tester Connection Specified Condition
3G-5 - 3G-8 10 k or higher
3G-5 - 3G-8 Below 1
(when battery voltage is applied to
terminals 3G-6 and 3G-7)

If the result is not as specified, replace the

integration relay.
(d) Connect the 2 connectors to the integration relay.
(e) Install the integration relay to the engine room No. 1
junction block.
3. CONNECT CABLE TO NEGATIVE BATTERY
TERMINAL
4. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
Certain system need to be initialized after
disconnecting and reconnecting the cable from
A114366E02
the negative (-) battery terminal.
 1NZ-FXE ENGINE CONTROL SYSTEM – ECM ES–465

ECM
1NZ-FXE ENGINE CONTROL SYSTEM
ENGINE

COMPONENTS

ES

B126622E02
 ES–466 1NZ-FXE ENGINE CONTROL SYSTEM – ECM

ES

B126623E03
1NZ-FXE ENGINE CONTROL SYSTEM – ECM ES–467

ES

A112299E02
 ES–468 1NZ-FXE ENGINE CONTROL SYSTEM – ECM

ES

A112300E01
1NZ-FXE ENGINE CONTROL SYSTEM – ECM ES–469

REMOVAL
1. DISCONNECT CABLE FROM NEGATIVE BATTERY
TERMINAL
CAUTION:
Wait at least 90 seconds after disconnecting the
cable from the negative (-) battery terminal to
prevent airbag and seat belt pretensioner activation.
2. REMOVE INSTRUMENT PANEL SUB-ASSEMBLY
(a) Remove the instrument panel (see page IP-5).
3. REMOVE NO. 3 HEATER TO REGISTER DUCT (See
page AC-147)
4. REMOVE ECM
(a) Disconnect the 4 ECM connectors.
ES
(b) Disconnect the 4 hybrid vehicle control ECU
connectors.

A087532E01

(c) Remove the 2 nuts and bolt, and ECM with bracket.

A087535E01

(d) Remove the 2 nuts and ECM.

A087475E01
 ES–470 1NZ-FXE ENGINE CONTROL SYSTEM – ECM

(e) Remove the 6 screws and 3 No. 1 ECM brackets.

A087476E01

(f) Remove the 4 screws and 2 No. 2 ECM brackets.

ES

A087477E01

(g) Remove the 2 screws and No. 3 ECM bracket.

A087478E01

INSTALLATION
1. INSTALL ECM
(a) Install the No. 3 ECM bracket with the 2 screws.

A087478E01

(b) Install the 2 No. 2 ECM brackets with the 4 screws.

A087477E01
1NZ-FXE ENGINE CONTROL SYSTEM – ECM ES–471

(c) Install the 3 No. 1 ECM brackets with the 6 screws.

A087476E01

(d) Install the ECM with the 2 nuts.

Torque: 3.0 N*m (31 kgf*cm, 27 in.*lbf)
ES

A087475E01

(e) Install the ECM with bracket with the 2 nuts and bolt.
Torque: 3.0 N*m (31 kgf*cm, 27 in.*lbf)

A087535E01

(f) Connect the 4 hybrid vehicle control ECU

connectors.
(g) Connect the 4 ECM connectors.
2. INSTALL NO. 3 HEATER TO REGISTER DUCT (See
page AC-159)
3. INSTALL INSTRUMENT PANEL SUB-ASSEMBLY
(a) Install the instrument panel (see page IP-11).
4. CONNECT CABLE TO NEGATIVE BATTERY
A087532E01
TERMINAL
5. PERFORM INITIALIZATION
(a) Perform initialization (see page IN-32).
NOTICE:
Certain systems need to be initialized after
disconnecting and reconnecting the cable from
the negative (-) battery terminal.