Nissan Frontier. Manual - part 519

 

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Nissan Frontier. Manual - part 519

 

 

P0116 ECT SENSOR

EC-647

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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P0116 ECT SENSOR

Component Description

INFOID:0000000009481292

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 70 (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:0000000009481293

DTC Confirmation Procedure

INFOID:0000000009481294

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-648, "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?

YES

>> INSPECTION END

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

EC-648

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0116 ECT SENSOR

NO

>> Proceed to 

EC-649, "Diagnosis Procedure"

.

3.

PRECONDITIONING

If DTC CONFIRMATION PROCEDURE has been previously conducted, always perform the following proce-

dure before conducting the next test.

1. Turn ignition switch OFF and wait at least 10 seconds.

2. Turn ignition switch ON.

3. Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:

• Before performing the following procedure, do not add fuel.

• Before performing the following procedure, check that fuel level is between 1/4 and 4/4.

• Before performing the following procedure, confirm that battery voltage is 11 V or more at idle.

>> GO TO 4.

4.

PERFORM DTC CONFIRMATION PROCEDURE

1. Start engine and let it idle for 60 minutes.

2. Move the vehicle to a cool place.

NOTE:

Cool the vehicle in an environment of ambient air temperature between 

−10°C (14°F) and 35°C (95°F).

3. Turn ignition switch OFF and soak the vehicle for 12 hours.

CAUTION:

Never turn ignition switch ON during soaking.

NOTE:

The vehicle must be cooled with the food open.

4. Start engine and let it idle for 20 minutes or more.

CAUTION:

Never turn ignition switch OFF during idling.

5. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-649, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Component Function Check

INFOID:0000000009481295

1.

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

1. Turn ignition switch OFF.

2. Disconnect ECT sensor harness connector.

3. Remove ECT sensor. Refer to 

CO-57, "Removal and Installation"

.

4. Check resistance between ECT sensor terminals by heating

with hot water as shown in the figure.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Proceed to 

EC-649, "Diagnosis Procedure"

.

2.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-649, "Diagnosis Procedure"

.

Terminals

Condition

Resistance (k

Ω)

1 and 2

Temperature [

°C (°F)]

20 (68)

2.10 – 2.90

50 (122)

0.68 – 1.00

90 (194)

0.236 – 0.260

JMBIA0080ZZ

P0116 ECT SENSOR

EC-649

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

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Diagnosis Procedure

INFOID:0000000009481296

1.

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

Check ECT sensor. Refer to 

EC-649, "Component Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Replace ECT sensor. Refer to 

CO-57, "Removal and Installation"

.

2.

CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

>> INSPECTION END

Component Inspection

INFOID:0000000009481297

ENGINE COOLANT TEMPERATURE SENSOR

1. Check resistance between engine coolant temperature sensor

terminals 1 and 2 as shown in the figure.

2. If NG, replace engine coolant temperature sensor. Refer to 

CO-

57, "Removal and Installation"

.

JMBIA0080ZZ

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

EC-650

< DTC/CIRCUIT DIAGNOSIS >

[VQ40DE FOR USA AND CANADA]

P0117, P0118 ECT SENSOR

P0117, P0118 ECT SENSOR

Component Description

INFOID:0000000009481298

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 70 (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:0000000009481299

These self-diagnoses have the one trip detection logic.

FAIL-SAFE MODE

When the malfunction is detected, the ECM enters fail-safe mode and the MIL illuminates.

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
0117

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
0118

Engine coolant tem-
perature sensor cir-
cuit high input

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

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 following condition.
CONSULT displays the engine coolant temperature decided by ECM.

Condition

Engine coolant temperature decided 

(CONSULT display)

Just as ignition switch is turned ON or START

40

°C (104°F)

Approx. 4 minutes or more after engine starting

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.

 

 

 

 

 

 

 

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