Nissan Frontier D22. Manual - part 408

DTC P0112, P0113 IAT SENSOR

EC-735

[VG33E]

C

D

E

F

G

H

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K

L

M

A

EC

Wiring Diagram

UBS00DGK

BBWA1074E

EC-736

[VG33E]

DTC P0112, P0113 IAT SENSOR

Diagnostic Procedure

UBS00DGL

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.

DTC P0112, P0113 IAT SENSOR

EC-737

[VG33E]

C

D

E

F

G

H

I

J

K

L

M

A

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-737, "Component Inspection"

 .

OK or NG

OK

>> GO TO 6.

NG

>> Replace intake air temperature sensor.

6. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Component Inspection

UBS00DGM

INTAKE AIR TEMPERATURE SENSOR

Check resistance as shown in the figure.

<Reference data>

SEF947Q

Intake air temperature 

°C (°F)

Resistance k

Ω

20 (68)

2.1 - 2.9

80 (176)

0.27 - 038

SEF012P

EC-738

[VG33E]

DTC P0117, P0118 ECT SENSOR

DTC P0117, P0118 ECT SENSOR

PFP:22630

Component Description

UBS00DGN

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

UBS00DGO

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.