Nissan Frontier D22. Manual - part 567

 

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Nissan Frontier D22. Manual - part 567

 

 

DTC P0127 IAT SENSOR

EC-1371

[VG33ER]

C

D

E

F

G

H

I

J

K

L

M

A

EC

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 temperature
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-1371, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II”.

Diagnostic Procedure

UBS00DUQ

1. 

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to 

EC-1371, "Component Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Replace intake air temperature sensor.

2. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

For Wiring Diagram, refer to 

EC-1342, "Wiring Diagram"

 .

>> INSPECTION END.

Component Inspection

UBS00DUR

INTAKE AIR TEMPERATURE SENSOR

1.

Check resistance as shown in the figure.

<Reference data>

SEF176Y

SEF947Q

Intake air temperature 

°C (°F)

Resistance k

20 (68)

2.1 - 2.9

80 (176)

0.27 - 038

SEF012P

EC-1372

[VG33ER]

DTC P0127 IAT SENSOR

2.

If NG, replace in take air temperature sensor.

DTC P0128 THERMOSTAT FUNCTION

EC-1373

[VG33ER]

C

D

E

F

G

H

I

J

K

L

M

A

EC

DTC P0128 THERMOSTAT FUNCTION

PFP:21200

On Board Diagnosis Logic

UBS00DUS

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

UBS00DUT

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 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 70°C (158°F).

 WITH CONSULT-II

1.

Replace thermostat with new one. Refer to 

CO-28, "THERMOSTAT"

 . Use only a genuine NISSAN ther-

mostat 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 70

°C (158°F).

If it is below 70

°C (158°F), go to following step.

If it is above 70

°C (158°F), stop engine and cool down the

engine to less than 70

°C (158°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-1373, "Diagnostic Proce-

dure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

Diagnostic Procedure

UBS00DUU

1. 

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-1374, "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

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)

PBIB1917E

EC-1374

[VG33ER]

DTC P0128 THERMOSTAT FUNCTION

Component Inspection

UBS00DUV

ENGINE COOLANT TEMPERATURE SENSOR

1.

Check resistance as shown in the figure.

<Reference data>

2.

If NG, replace engine coolant temperature sensor.

Removal and Installation

UBS00DUW

ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EM-80, "OUTER COMPONENT PARTS"

 .

SEF152P

Temperature 

°C (°F)

Resistance k

20 (68)

2.1 - 2.9

50 (122) 

0.68 - 1.00

90 (194)

0.236 - 0.260

SEF012P

 

 

 

 

 

 

 

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