Nissan Frontier D22. Manual - part 270

DTC P0127 IAT SENSOR

EC-183

[KA24DE]

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EC

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E43, M65

●

Harness connectors M81, F36

●

Harness for open or short between ECM and intake air temperature sensor

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

5. 

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to 

EC-183, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG 

>> Replace intake air temperature sensor.

6. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-120, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00D3P

INTAKE AIR TEMPERATURE SENSOR

1.

Check resistance between intake air temperature sensor termi-
nals 1 and 2 as shown in the figure.

<Reference data>

2.

If NG, replace intake air temperature sensor.

PBIB0081E

Temperature

°C (°F)

Resistance

k

Ω

20 (68)

2.1 - 2.9

80 (176)

0.27 - 0.38

SEF012P

EC-184

[KA24DE]

DTC P0128 THERMOSTAT FUNCTION

DTC P0128 THERMOSTAT FUNCTION

PFP:21200

On Board Diagnosis Logic

UBS00D3Q

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

UBS00D3R

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 60°C (140°F).

WITH CONSULT-II

1.

Replace thermostat with new one. Refer to 

CO-13, "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 60

°C (140°F).

If it is below 60

°C (140°F), go to following step.

If it is above 60

°C (140°F), stop engine and 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-185, "Diagnostic Procedure"

.

WITH GST

1.

Follow the procedure “WITH CONSULT-II” above.

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 thermostat

●

Engine coolant temperature sensor

VHCL SPEED SE

80 - 120 km/h (50 - 75 MPH)

PBIB1917E

DTC P0128 THERMOSTAT FUNCTION

EC-185

[KA24DE]

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Diagnostic Procedure

UBS00D3S

1. 

CHECK ENGINE COOLANT TEMPERATURE SENSOR

1.

Turn ignition switch OFF.

2.

Remove engine coolant temperature sensor.

3.

Check resistance between engine coolant temperature sensor terminals under the following conditions.

OK or NG

OK

>> INSPECTION END.

NG

>> Replace engine coolant temperature sensor.

SEF304X

EC-186

[KA24DE]

DTC P0132 HO2S1

DTC P0132 HO2S1

PFP:22690

Component Description

UBS00D3T

The heated oxygen sensor 1 is placed into the exhaust manifold. It
detects the amount of oxygen in the exhaust gas compared to the
outside air. The heated oxygen sensor 1 has a closed-end tube
made of ceramic zirconia. The zirconia generates voltage from
approximately 1V in richer conditions to 0V in leaner conditions. The
heated oxygen sensor 1 signal is sent to the ECM. The ECM adjusts
the injection pulse duration to achieve the ideal air-fuel ratio. The
ideal air-fuel ratio occurs near the radical change from 1V to 0V.

CONSULT-II Reference Value in Data Monitor Mode

UBS00D3U

Specification data are reference values.

On Board Diagnosis Logic

UBS00D3V

To judge the malfunction, the diagnosis checks that the heated oxy-
gen sensor 1 output is not inordinately high.

SEF463R

SEF288D

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S1 (B1)

●

Engine: After warming up

Maintaining engine speed at 2,000 
rpm

0 - 0.3V 

←→ Approx. 0.6 - 1.0V

HO2S1 MNTR 
(B1)

LEAN 

←→ RICH

Changes more than 5 times during 
10 seconds.

PBIB1877E

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0132

Heated oxygen sensor 
1 circuit high voltage

An excessively high voltage from the sensor is 
sent to ECM.

●

Harness or connectors
(The sensor circuit is open or shorted)

●

Heated oxygen sensor 1