Nissan Frontier D22. Manual - part 262

DTC P0112, P0113 IAT SENSOR

EC-151

[KA24DE]

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EC

Wiring Diagram

UBS00D2R

BBWA1056E

EC-152

[KA24DE]

DTC P0112, P0113 IAT SENSOR

Diagnostic Procedure

UBS00D2S

1. 

CHECK POWER SUPPLY

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 with CONSULT-II
or tester.

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 GROUND CIRCUIT

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.

SEF329V

Voltage

: Approximately 5V

AEC570A

Continuity should exist.

DTC P0112, P0113 IAT SENSOR

EC-153

[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

Check resistance as shown in the figure.

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.

SEF302X

EC-154

[KA24DE]

DTC P0117, P0118 ECT SENSOR

DTC P0117, P0118 ECT SENSOR

PFP:22630

Component Description

UBS00D2T

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 ECM terminals, such as the ground.

CONSULT-II Reference Value in Data Monitor Mode

UBS00D2U

On Board Diagnosis Logic

UBS00D2V

These self-diagnoses have the one trip detection logic.

FAIL-SAFE MODE

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

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

MONITOR ITEM

CONDITION

SPECIFICATION

COOLAN TEMP/S

●

Engine: After warming up

More than 70

°C (158°F)

DTC No.

Trouble Diagnosis Name

DTC Detecting Condition

Possible Cause

P0117

Engine coolant temperature 
sensor circuit 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 temperature 
sensor circuit high input

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

Detected items

Engine operating condition in fail-safe mode

Engine coolant tem-
perature sensor circuit

Engine coolant temperature will be determined by ECM based on the time after turning ignition switch to 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 to ON or START

40

°C (104°F)

More than approx. 4 minutes after ignition ON or 
STAR

80

°C (176°F)

Except as shown above

40 - 80

°C (104 - 176°F)

(Depends on the time)