Nissan Pathfinder (2009 year). Manual — part 265

EC-371, "Component Inspection"

OK or NG

>> GO TO 11.

>> GO TO 6.

REPLACE ACCELERATOR PEDAL ASSEMBLY

Replace accelerator pedal assembly.

EC-25, "Accelerator Pedal Released Position Learning"

EC-25, "Idle Air Volume Learning"

>> INSPECTION END

CHECK THROTTLE POSITION SENSOR 2 GROUND CIRCUIT FOR OPEN AND SHORT

Turn ignition switch OFF.

Disconnect ECM harness connector.

Check harness continuity between electric throttle control actuator terminal 4 and ECM terminal 66.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 8.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK THROTTLE POSITION SENSOR 2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Check harness continuity between ECM terminal 69 and electric throttle control actuator terminal 3.
Refer to Wiring Diagram.

Also check harness for short to ground and short to power.

OK or NG

>> GO TO 9.

>> Repair open circuit or short to ground or short to power in harness or connectors.

CHECK THROTTLE POSITION SENSOR

EC-135, "Component Inspection"

OK or NG

>> GO TO 11.

>> GO TO 10.

10.

REPLACE ELECTRIC THROTTLE CONTROL ACTUATOR

Replace the electric throttle control actuator.

EC-25, "Idle Air Volume Learning"

>> INSPECTION END

11.

CHECK INTERMITTENT INCIDENT

GI-49, "Intermittent Incident"

Continuity should exist.

2009 Pathfinder

P0122, P0123 TP SENSOR

EC-135

< COMPONENT DIAGNOSIS >

[VQ40DE]

>> INSPECTION END

Component Inspection

INFOID:0000000004297321

THROTTLE POSITION SENSOR

Reconnect all harness connectors disconnected.

Turn ignition switch ON.

Set selector lever to D position.

Check voltage between ECM terminals 50 (TP sensor 1 signal),
69 (TP sensor 2 signal) and ground under the following condi-
tions.

If NG, replace electric throttle control actuator and go to the next
step.

EC-25, "Idle Air Volume Learning"

Terminal

Accelerator pedal

Voltage

50
(Throttle position sensor 1)

Fully released

More than 0.36V

Fully depressed

Less than 4.75V

69
(Throttle position sensor 2)

Fully released

Less than 4.75V

Fully depressed

More than 0.36V

PBIB1608E

2009 Pathfinder

EC-136

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0125 ECT SENSOR

P0125 ECT SENSOR

Component Description

INFOID:0000000004297322

The engine coolant temperature sensor is used to detect the engine
coolant temperature. The sensor modifies a voltage signal from the
ECM. The modified signal returns to the ECM as the engine coolant
temperature input. The sensor uses a thermistor which is sensitive to
the change in temperature. The electrical resistance of the ther-
mistor decreases as temperature increases.

<Reference data>

*: This data is reference value and is measured between ECM terminal 73 (Engine
coolant temperature sensor) and ground.

CAUTION:

Never use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

On Board Diagnosis Logic

INFOID:0000000004297323

NOTE:
If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to

EC-

125, "Component Description"

NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. Refer to

EC-128, "Component Description"

DTC Confirmation Procedure

INFOID:0000000004297324

CAUTION:

Never overheat engine.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

WITH CONSULT-III

SEF594K

Engine coolant

temperature

C (

Voltage*

Resistance

Ω

-10 (14)

4.4

7.0 - 11.4

20 (68)

3.5

2.1 - 2.9

50 (122)

2.2

0.68 - 1.00

90 (194)

0.9

0.236 - 0.260

SEF012P

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0125
0125

Insufficient engine cool-
ant temperature for
closed loop fuel control

• Voltage sent to ECM from the sensor is not

practical, even when some time has passed
after starting the engine.

• Engine coolant temperature is insufficient for

closed loop fuel control.

• Harness or connectors

(High resistance in the circuit)

• Engine coolant temperature sensor
• Thermostat

2009 Pathfinder

P0125 ECT SENSOR

EC-137

< COMPONENT DIAGNOSIS >

[VQ40DE]

Turn ignition switch ON.

Select “DATA MONITOR” mode with CONSULT-III.

Check that “COOLAN TEMP/S” is above 20

C (68

F).

If the temperature is above 20

C (68

F), the test result will be OK.

If the temperature is below 20

C (68

F), go to following step.

Start engine and run it for 65 minutes at idle speed.
If “COOLAN TEMP/S” increases to more than 20

C (68

F) within 65 minutes, stop engine because

the test result will be OK.

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-137, "Diagnosis Procedure"

WITH GST

Follow the procedure “WITH CONSULT-III” above.

Diagnosis Procedure

INFOID:0000000004297325

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

Loosen and retighten three ground screws on the body. Refer to

EC-95, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

EC-137, "Component Inspection"

OK or NG

>> GO TO 3.

>> Replace engine coolant temperature sensor.

CHECK THERMOSTAT OPERATION

When the engine is cold [lower than 70

C (158

F)] condition, grasp lower radiator hose and confirm that the

engine coolant does not flow.

OK or NG

>> GO TO 4.

>> Repair or replace thermostat. Refer to

CO-27, "Removal and Installation"

CHECK INTERMITTENT INCIDENT

GI-49, "Intermittent Incident"

>> INSPECTION END

Component Inspection

INFOID:0000000004297326

ENGINE COOLANT TEMPERATURE SENSOR

BBIA0539E

2009 Pathfinder

EC-138

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0125 ECT SENSOR

Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

<Reference data>

If NG, replace engine coolant temperature sensor.

PBIB2005E

Engine coolant temperature

C (

Resistance

Ω

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

SEF012P

2009 Pathfinder

P0127 IAT SENSOR

EC-139

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0127 IAT SENSOR

Component Description

INFOID:0000000004297327

The intake air temperature sensor is built into mass air flow sensor
(1). The sensor detects intake air temperature and transmits a signal
to the ECM.
The temperature sensing unit uses a thermistor which is sensitive to
the change in temperature. Electrical resistance of the thermistor
decreases in response to the temperature rise.

<Reference data>

*: This data is reference value and is measured between ECM terminal 34 (Intake air
temperature sensor) and ground.

CAUTION:

Never use ECM ground terminals when measuring input/output
voltage. Doing so may result in damage to the ECM's transistor.
Use a ground other than ECM terminals, such as the ground.

On Board Diagnosis Logic

INFOID:0000000004297328

DTC Confirmation Procedure

INFOID:0000000004297329

NOTE:
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next step.
1.

Turn ignition switch OFF and wait at least 10 seconds.

Turn ignition switch ON.

Turn ignition switch OFF and wait at least 10 seconds.

CAUTION:

Always drive vehicle at a safe speed.
TESTING CONDITION:
This test may be conducted with the drive wheels lifted in the shop or by driving the vehicle. If a road
test is expected to be easier, it is unnecessary to lift the vehicle.

WITH CONSULT-III

Wait until engine coolant temperature is less than 90

C (194

Turn ignition switch ON.

Select “DATA MONITOR” mode with CONSULT-III.

Check the engine coolant temperature.

PBIA9559J

Intake air temperature

C (

Voltage*

Resistance

Ω

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

SEF012P

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0127
0127

Intake air temperature
too high

Rationally incorrect voltage from the sensor is
sent to ECM, compared with the voltage signal
from engine coolant temperature sensor.

• Harness or connectors

(The sensor circuit is open or shorted)

• Intake air temperature sensor

2009 Pathfinder

EC-140

< COMPONENT DIAGNOSIS >

[VQ40DE]

P0127 IAT SENSOR

If the engine coolant temperature is not less than 90

C (194

F), turn ignition switch OFF and cool down

engine.
• Perform the following steps before engine coolant temperature is above 90

C (194

F).

Turn ignition switch ON.

Select “DATA MONITOR” mode with CONSULT-III.

Start engine.

Hold vehicle speed at more than 70 km/h (43 MPH) for 100 consecutive seconds.

Check 1st trip DTC.

If 1st trip DTC is detected, go to

EC-140, "Diagnosis Procedure"

WITH GST

Follow the procedure “WITH CONSULT-III” above.

Diagnosis Procedure

INFOID:0000000004297330

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

Loosen and retighten three ground screws on the body. Refer to

EC-95, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

CHECK INTAKE AIR TEMPERATURE SENSOR

EC-140, "Component Inspection"

OK or NG

>> GO TO 3.

>> Replace mass air flow sensor (with intake air temperature sensor).

CHECK INTERMITTENT INCIDENT