Nissan Sentra. Manual - part 375

EC-196

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0116 ECT SENSOR

P0116 ECT SENSOR

DTC Logic

INFOID:0000000009758456

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

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-197, "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

NO

>> Proceed to 

EC-197, "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. 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).

2. Turn ignition switch OFF and leave the vehicle for 12 hours.

CAUTION:

Never turn ignition switch ON during this procedure.

NOTE:

The vehicle must be cooled with the food open.

3. Start engine and let it idle for 5 minutes or more.

CAUTION:

Never turn ignition switch OFF during idling.

4. Check 1st trip DTC.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0116

ECT SEN/CIRC
(Engine coolant temperature 
sensor 1 circuit range/perfor-
mance)

The comparison result of signals transmitted 
to ECM from each temperature sensor (IAT 
sensor, ECT sensor, FTT sensor, and EOT 
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

P0116 ECT SENSOR

EC-197

< DTC/CIRCUIT DIAGNOSIS >

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Is 1st trip DTC detected?

YES

>> Proceed to 

EC-197, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Component Function Check

INFOID:0000000009758457

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-24, "Exploded View"

.

4. Check resistance between ECT sensor terminals by heating

with hot water as shown in the figure.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Proceed to 

EC-197, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000009758458

1.

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

Check ECT sensor. Refer to 

EC-197, "Component Inspection"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Replace ECT sensor. Refer to 

CO-24, "Exploded View"

.

Component Inspection

INFOID:0000000009758459

1.

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

1. Turn ignition switch OFF.

2. Disconnect ECT sensor harness connector.

3. Remove ECT sensor.

4. Check resistance between ECT sensor terminals by heating

with hot water as shown in the figure.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace engine coolant temperature sensor. Refer to 

CO-24, "Exploded View"

.

ECT sensor

Condition

Resistance (k

Ω)

+

−

Terminal

1

2

Temperature [

°C 

(

°F)]

20 (68)

2.37 – 2.63

50 (122)

0.68 – 1.00

90 (194)

0.236 – 0.260

JMBIA0080ZZ

ECT sensor

Condition

Resistance 

(k

Ω)

+

−

Terminal

1

2

Temperature [

°C (°F)]

20 (68)

2.37 - 2.63

50 (122)

0.68 - 1.00

90 (194)

0.236 - 0.260

JMBIA0080ZZ

EC-198

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P0117, P0118 ECT SENSOR

P0117, P0118 ECT SENSOR

DTC Logic

INFOID:0000000009758460

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure

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.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

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

2. Check DTC.
Is DTC detected?

YES

>> Proceed to 

EC-198, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758461

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY

1. Turn ignition switch OFF.

2. Disconnect engine coolant temperature (ECT) sensor harness connector.

3. Turn ignition switch ON.

4. Check the voltage between ECT sensor harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK ENGINE COOLANT TEMPERATURE SENSOR POWER SUPPLY CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between ECT sensor harness connector and ECM harness connector.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0117

ECT SEN/CIRC
(Engine coolant tempera-
ture sensor 1 circuit low)

An excessively low voltage from the engine 
coolant temperature sensor is sent to ECM.

• Harness or connectors

(Engine coolant temperature sensor cir-
cuit is open or shorted.)

• Engine coolant temperature sensor 

P0118

ECT SEN/CIRC
(Engine coolant tempera-
ture sensor 1 circuit high)

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

+

−

Voltage

(Approx.)

ECT sensor

Connector

Terminal

F6

1

Ground

5.0 V

P0117, P0118 ECT SENSOR

EC-199

< DTC/CIRCUIT DIAGNOSIS >

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4. Also check harness for short to ground.
Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

3.

CHECK ENGINE COOLANT TEMPERATURE SENSOR GROUND CIRCUIT

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Check the continuity between ECT sensor harness connector and ECM harness connector.

4. Also check harness for short to ground to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check the engine coolant temperature sensor. Refer to 

EC-199, "Component Inspection (ECT Sensor)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-39, "Intermittent Incident"

.

NO

>> Replace engine coolant temperature sensor. Refer to 

CO-24, "Exploded View"

.

Component Inspection (ECT Sensor)

INFOID:0000000009758462

1.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

1. Turn ignition switch OFF.

2. Disconnect engine coolant temperature sensor harness connector.

3. Remove engine coolant temperature sensor.

4. Check resistance between engine coolant temperature sensor

terminals by heating with hot water as shown in the figure.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace engine coolant temperature sensor. Refer to 

CO-24, "Exploded View"

.

+

−

Continuity

ECT sensor

ECM

Connector

Terminal

Connector

Terminal

F6

1

F24

28

Existed

+

−

Continuity

ECT sensor

ECM

Connector

Terminal

Connector

Terminal

F6

2

F24

27

Existed

ECT sensor

Condition

Resistance

+

−

Terminal

1

2

Temperature [

°C (°F)]

20 (68)

2.37 - 2.63 k

Ω

50 (122)

0.68 - 1.00 k

Ω

90 (194)

0.236 - 0.260 k

Ω

JMBIA0080ZZ