Nissan Frontier. Manual - part 401

 

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Nissan Frontier. Manual - part 401

 

 

P0112, P0113 IAT SENSOR

EC-175

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

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P0112, P0113 IAT SENSOR

Component Description

INFOID:0000000009480817

The intake air temperature sensor is built into the mass air flow sen-

sor (1). The sensor detects intake air temperature and transmits a

signal to the ECM.

The temperature sensing unit uses a thermistor which is sensitive to

the change in temperature. Electrical resistance of the thermistor

decreases in response to the rise in temperature.

<Reference data>

*: This data is reference value and is measured between ECM terminal 50 (Intake air
temperature sensor) and 56 (sensor ground).

CAUTION:

Never use ECM ground terminals when measuring input/output

voltage. Doing so may result in damage to the ECM's transistor. Use a ground other than ECM termi-

nals, such as the ground.

On Board Diagnosis Logic

INFOID:0000000009480818

DTC Confirmation Procedure

INFOID:0000000009480819

NOTE:

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at

least 10 seconds before conducting the next test.

 WITH CONSULT

1. Turn ignition switch ON and wait at least 5 seconds.

2. Check 1st trip DTC.

3. If 1st trip DTC is detected, go to 

EC-175, "Diagnosis Procedure"

.

 WITH GST

Follow the procedure “WITH CONSULT” above.

Diagnosis Procedure

INFOID:0000000009480820

1.

CHECK GROUND CONNECTIONS

1. Turn ignition switch OFF.

PBIA9559J

Intake air temperature        

[

°C(°F)]

Voltage* (V)

Resistance (k

Ω)

25 (77)

3.3

1.800 - 2.200

80 (176)

1.2

0.283 - 0.359

SEF012P

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0112
0112

Intake air 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.)

• Intake air temperature sensor

P0113
0113

Intake air temperature 
sensor circuit high input

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

EC-176

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0112, P0113 IAT SENSOR

2. Loosen and retighten two ground screws on the body. Refer to 

EC-149, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK INTAKE AIR TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1. Disconnect mass air flow sensor (intake air temperature sensor

is built-into) harness connector.

2. Turn ignition switch ON.

3. Check voltage between mass air flow sensor terminal 5 and

ground.

OK or NG

OK

>> GO TO 3.

NG

>> Repair harness or connectors.

3.

CHECK INTAKE AIR TEMPERATURE SENSOR GROUND CIRCUIT FOR OPEN AND SHORT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check harness continuity between mass air flow sensor terminal 6 and ECM terminal 56.

Refer to Wiring Diagram.

4. Also check harness for short to ground and short to power.
OK or NG

OK

>> GO TO 4.

NG

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

4.

CHECK INTAKE AIR TEMPERATURE SENSOR

Refer to 

EC-177, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace mass air flow sensor (with intake air temperature sensor). Refer to 

EM-25, "Exploded

View"

.

BBIA0614E

BBIA0622E

Voltage: Approximately 5V

PBIB1169E

Continuity should exist.

P0112, P0113 IAT SENSOR

EC-177

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

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5.

CHECK INTERMITTENT INCIDENT

Refer to

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009480821

INTAKE AIR TEMPERATURE SENSOR

1. Check resistance between mass air flow sensor (1) terminals 5

and 6 under the following conditions.

2. If NG, replace mass air flow sensor (with intake air temperature

sensor). Refer to 

EM-25, "Exploded View"

.

Intake air temperature [

°C (°F)]

Resistance (k

Ω)

25 (77)

1.800 - 2.200

PBIA9559J

SEF012P

EC-178

< DTC/CIRCUIT DIAGNOSIS >

[QR25DE]

P0116 ECT SENSOR

P0116 ECT SENSOR

Component Description

INFOID:0000000009480822

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>

*: This data is reference value and is measured between ECM terminal 46 (Engine
coolant temperature sensor) and 52 (Sensor ground).

CAUTION:

Never 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.

On Board Diagnosis Logic

INFOID:0000000009480823

DTC Confirmation Procedure

INFOID:0000000009480824

1.

INSPECTION START

Is it necessary to erase permanent DTC?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

PERFORM COMPONENT FUNCTION CHECK

Perform component function check. Refer to 

EC-179, "Component Function Check"

.

NOTE:

Use the component function check to check the overall function of the ECT sensor circuit. During this check, a

1st trip DTC might not be confirmed.
Is the inspection result normal?

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

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0116

ECT SEN/CIRC
[Engine coolant temperature 
(ECT) sensor circuit range/per-
formance]

The comparison result of signals transmitted 
to ECM from each temperature sensor (IAT 
sensor, ECT sensor, and FTT sensor) shows 
that the voltage signal of the ECT sensor is 
higher/lower than that of other temperature 
sensors when the engine is started with its 
cold state.

• Harness or connectors

(High or low resistance in the ECT 
sensor circuit)

• ECT sensor

 

 

 

 

 

 

 

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