Nissan Frontier D40. Manual - part 357

P0112, P0113 IAT SENSOR

EC-119

< COMPONENT DIAGNOSIS >

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5.

CHECK INTERMITTENT INCIDENT

Refer to

GI-46, "Intermittent Incident"

 .

>> INSPECTION END

Component Inspection

INFOID:0000000005273096

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).

Intake air temperature [

°

C (

°

F)]

Resistance (k

Ω

)

25 (77)

1.800 - 2.200

PBIA9559J

SEF012P

EC-120

< COMPONENT DIAGNOSIS >

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P0116 ECT SENSOR

P0116 ECT SENSOR

Component Description

INFOID:0000000005273097

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 73 (Engine
coolant temperature sensor) and 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:0000000005273098

NOTE:
• If DTC P0116 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117,

P0118. Refer to 

EC-124, "DTC Confirmation Procedure"

.

• This self-diagnosis has the one trip detection logic.

DTC Confirmation Procedure

INFOID:0000000005273099

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.
TESTING CONDITION:
Before performing the following procedure, do not add fuel.
1.

Start engine and warm it up to normal operating temperature.

2.

Rev engine up to 2,000 rpm for more than10 minutes.

3.

Move the vehicle to a cool place, then stop engine and turn ignition switch OFF.

4.

Check resistance between “fuel level sensor unit and fuel pump” terminals 2 and 4.

5.

Soak the vehicle until the resistance between “fuel level sensor unit and fuel pump” terminals 2 and 4
becomes 0.5 k

Ω

 higher than the value measured before soaking.

CAUTION:

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

P0116
0116

Engine coolant tempera-
ture sensor circuit range/
performance

Engine coolant temperature signal from engine 
coolant temperature sensor does not fluctuate, 
even when some time has passed after starting 
the engine with pre-warming up condition.

• Harness or connectors

(High or low resistance in the circuit)

• Engine coolant temperature sensor

P0116 ECT SENSOR

EC-121

< COMPONENT DIAGNOSIS >

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Never turn ignition switch ON during soaking.
NOTE:
Soak time changes depending on ambient air temperature. It may take several hours.

6.

Start engine and let it idle for 20 minutes.

7.

Check DTC.

8.

If DTC is detected, go to 

EC-121, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000005273100

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screws on the body.
Refer to 

EC-90, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

2.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-121, "Component Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>> Replace engine coolant temperature sensor.

3.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-46, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000005273101

ENGINE COOLANT TEMPERATURE SENSOR

1.

Check resistance between engine coolant temperature sensor
terminals 1 and 2 as shown in the figure.

BBIA0614E

PBIB2005E

EC-122

< COMPONENT DIAGNOSIS >

[QR25DE]

P0116 ECT SENSOR

2.

If NG, replace engine coolant temperature sensor.

Engine coolant temperature [

°

C (

°

F)]

Resistance (k

Ω

)

20 (68)

2.1 - 2.9

50 (122)

0.68 - 1.00

90 (194)

 0.236 - 0.260

SEF012P