Nissan Frontier D22. Manual - part 560

 

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Nissan Frontier D22. Manual - part 560

 

 

DTC P0112, P0113 IAT SENSOR

EC-1343

[VG33ER]

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Diagnostic Procedure

UBS00DTU

1. 

CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect intake air temperature sensor harness connector.

3.

Turn ignition switch ON.

4.

Check voltage between terminal 1 and ground.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

2. 

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 harness or connectors.

3. 

CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Check harness continuity between intake air temperature sensor terminal 2 and engine ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

LEC519

Voltage: Approximately 5V

SEF203W

Continuity should exist.

EC-1344

[VG33ER]

DTC P0112, P0113 IAT SENSOR

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-1344, "Component Inspection"

OK or NG

OK

>> GO TO 6.

NG

>> Replace intake air temperature sensor.

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-1297, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00DTV

INTAKE AIR TEMPERATURE SENSOR

Check resistance as shown in the figure.

<Reference data>

SEF947Q

Intake air temperature 

°C (°F)

Resistance k

20 (68)

2.1 - 2.9

80 (176)

0.27 - 038

SEF012P

DTC P0117, P0118 ECT SENSOR

EC-1345

[VG33ER]

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DTC P0117, P0118 ECT SENSOR

PFP:22630

Component Description

UBS00DTW

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>

*: These data are reference values and are measured between ECM terminal 59
(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 the ECM terminals, such as the ground.

On Board Diagnosis Logic

UBS00DTX

These self-diagnoses have the one trip detection logic.

SEF594K

Engine coolant 

temperature

°C (°F)

Voltage*

(V)

Resistance

(k

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

P0117

Engine coolant tem-
perature sensor cir-
cuit low input

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

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

Engine coolant temperature sensor 

P0118

Engine coolant tem-
perature sensor cir-
cuit high input

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

EC-1346

[VG33ER]

DTC P0117, P0118 ECT SENSOR

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters in fail-safe mode and the MIL lights up.

DTC Confirmation Procedure

UBS00DTY

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.

 WITH CONSULT-II

1.

Turn ignition switch ON.

2.

Select “DATA MONITOR” mode with CONSULT-II.

3.

Wait at least 5 seconds.

4.

If DTC is detected, go to 

EC-1348, "Diagnostic Procedure"

 .

 WITH GST

 Follow the procedure “WITH CONSULT-II”.

Detected items

Engine operating condition in fail-safe mode

Engine coolant temper-

ature sensor circuit

Engine coolant temperature will be determined by ECM based on the time after turning ignition switch ON 
or START.
CONSULT-II displays the engine coolant temperature decided by ECM.

Condition

Engine coolant temperature decided 

(CONSULT-II display)

Just as ignition switch is turned ON or START

40

°C (104°F)

More than approx. 4 minutes after ignition ON or 
Start

80

°C (176°F)

Except as shown above

40 - 80

°C (104 - 176°F)

(Depends on the time)

When the fail-safe system for engine coolant temperature sensor is activated, the cooling fan operates 
while engine is running.

SEF058Y

 

 

 

 

 

 

 

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