Nissan Pathfinder (2006 year). Manual - part 170

 

  Index      Manuals     Nissan Pathfinder (2006 year) - Service and Repair Manual

 

Search            copyright infringement  

 

 

 

 

 

 

 

 

Content      ..     168      169      170      171     ..

 

 

Nissan Pathfinder (2006 year). Manual - part 170

 

 

DTC P0125 ECT SENSOR

EC-219

C

D

E

F

G

H

I

J

K

L

M

A

EC

2006 Pathfinder

DTC P0125 ECT SENSOR

PFP:22630

Component Description

UBS00K6C

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

EC-207, "DTC P0117, P0118 ECT SENSOR"

 .

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:

Do not 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

UBS00K6D

SEF594K

Engine coolant 

temperature

°

C (

°

F)

Voltage*

V

Resistance

k

-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

EC-220

DTC P0125 ECT SENSOR

2006 Pathfinder

DTC Confirmation Procedure

UBS00K6E

CAUTION:

Be careful not to overheat engine.

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Check that “COOLAN TEMP/S” is above 10

°

C (50

°

F).

If it is above 10

°

C (50

°

F), the test result will be OK.

If it is below 10

°

C (50

°

F), go to following step.

4.

Start engine and run it for 65 minutes at idle speed.
If “COOLAN TEMP/S” increases to more than 10

°

C (50

°

F)

within 65 minutes, stop engine because the test result will
be OK.

5.

If 1st trip DTC is detected, go to 

EC-220, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

UBS00K6F

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

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

EC-151, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2. 

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-221, "Component Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

>> Replace engine coolant temperature sensor.

SEF174Y

BBIA0539E

DTC P0125 ECT SENSOR

EC-221

C

D

E

F

G

H

I

J

K

L

M

A

EC

2006 Pathfinder

3. 

CHECK THERMOSTAT OPERATION

When the engine is cold [lower than 70

°

C (158

°

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

coolant does not flow.

OK or NG

OK

>> GO TO 4.

NG

>> Repair or replace thermostat. Refer to 

CO-24, "WATER INLET AND THERMOSTAT ASSEMBLY"

.

4. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

Refer to 

EC-209, "Wiring Diagram"

 .

>> INSPECTION END

Component Inspection

UBS00K6G

ENGINE COOLANT TEMPERATURE SENSOR

1.

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

<Reference data>

2.

If NG, replace engine coolant temperature sensor.

Removal and Installation

UBS00K6H

ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

CO-24, "WATER INLET AND THERMOSTAT ASSEMBLY"

 .

PBIB2005E

Engine coolant temperature

°

C (

°

F)

Resistance

k

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

SEF012P

EC-222

DTC P0127 IAT SENSOR

2006 Pathfinder

DTC P0127 IAT SENSOR

PFP:22630

Component Description

UBS00K6I

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:

Do not 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

UBS00K6J

DTC Confirmation Procedure

UBS00K6K

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.

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-II

1.

Wait until engine coolant temperature is less than 90

°

C (194

°

F)

a.

Turn ignition switch ON.

PBIA9559J

Intake air temperature

°

C (

°

F)

Voltage*

V

Resistance

k

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

DTC P0127 IAT SENSOR

EC-223

C

D

E

F

G

H

I

J

K

L

M

A

EC

2006 Pathfinder

b.

Select “DATA MONITOR” mode with CONSULT-II.

c.

Check the engine coolant temperature.

d.

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 tempera-
ture is above 90

°

C (194

°

F).

2.

Turn ignition switch ON.

3.

Select “DATA MONITOR” mode with CONSULT-II.

4.

Start engine.

5.

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

6.

If 1st trip DTC is detected, go to 

EC-223, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

UBS00K6L

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

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

EC-151, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2. 

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to 

EC-224, "Component Inspection"

 .

OK or NG

OK

>> GO TO 3.

NG

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

3. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-144, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

Refer to 

EC-204, "Wiring Diagram"

 .

>> INSPECTION END

SEF189Y

BBIA0539E

EC-224

DTC P0127 IAT SENSOR

2006 Pathfinder

Component Inspection

UBS00K6M

INTAKE AIR TEMPERATURE SENSOR

1.

Check resistance between intake air temperature sensor (1) ter-
minals 5 and 6 under the following conditions.

2.

If NG, replace mass air flow sensor (with intake air temperature
sensor).

Removal and Installation

UBS00K6N

MASS AIR FLOW SENSOR

Refer to 

EM-16, "AIR CLEANER AND AIR DUCT"

 .

Intake air temperature 

°

C (

°

F)

Resistance k

25 (77)

1.800 - 2.200

PBIA9559J

SEF012P

DTC P0128 THERMOSTAT FUNCTION

EC-225

C

D

E

F

G

H

I

J

K

L

M

A

EC

2006 Pathfinder

DTC P0128 THERMOSTAT FUNCTION

PFP:21200

On Board Diagnosis Logic

UBS00K6O

Engine coolant temperature has not risen enough to open the thermostat even though the engine has run long
enough.
This is due to a leak in the seal or the thermostat stuck open.

DTC Confirmation Procedure

UBS00K6P

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:

For best results, perform at ambient temperature of –10

°

C (14

°

F) or higher.

For best results, perform at engine coolant temperature of –10

°

C (14

°

F) to 60

°

C (140

°

F).

 WITH CONSULT-II

1.

Replace thermostat with new one. Refer to 

CO-24, "WATER INLET AND THERMOSTAT ASSEMBLY"

 .

Use only a genuine NISSAN thermostat as a replacement. If an incorrect thermostat is used, the MIL may
come on.

2.

Turn ignition switch ON.

3.

Select “COOLAN TEMP/S” in “DATA MONITOR” mode with
CONSULT-II.

4.

Check that the “COOLAN TEMP/S” is above 60

°

C (140

°

F).

If it is below 60

°

C (140

°

F), go to following step.

If it is above 60

°

C (140

°

F), cool down the engine to less than

60

°

C (140

°

F), then retry from step 1.

5.

Drive vehicle for 10 consecutive minutes under the following
conditions.

If 1st trip DTC is detected, go to 

EC-225, "Diagnostic Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

UBS00K6Q

1. 

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-226, "Component Inspection"

 .

OK or NG

OK

>> INSPECTION END

NG

>> Replace engine coolant temperature sensor.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0128
0128

Thermostat function

The engine coolant temperature does not 
reach to specified temperature even though 
the engine has run long enough.

Thermostat

Leakage from sealing portion of thermo-
stat

Engine coolant temperature sensor

VHCL SPEED SE

80 - 120 km/h (50 - 75 MPH)

SEF176Y

EC-226

DTC P0128 THERMOSTAT FUNCTION

2006 Pathfinder

Component Inspection

UBS00K6R

ENGINE COOLANT TEMPERATURE SENSOR

1.

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

<Reference data>

2.

If NG, replace engine coolant temperature sensor.

Removal and Installation

UBS00K6S

ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

CO-24, "WATER INLET AND THERMOSTAT ASSEMBLY"

 .

PBIB2005E

Engine coolant temperature

°

C (

°

F)

Resistance

k

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

SEF012P

 

 

 

 

 

 

 

Content      ..     168      169      170      171     ..