Nissan Murano: Dtc/circuit Diagnosis / P0116 Ect Sensor

DTC Description

DTC DETECTION LOGIC

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.

POSSIBLE CAUSE

• Harness and connectors (High or low resistance in the ECT sensor circuit)

• ECT sensor

FAIL-SAFE

Not applicable

INSPECTION START

Is it necessary to erase permanent DTC?

GO TO 3.

GO TO 2.

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

1. Turn ignition switch OFF.

2. Disconnect ECT sensor harness connector.

3. Remove ECT sensor. Refer to Exploded View.

4. Check resistance between ECT sensor terminals by heating with hot water as shown in the figure.

   

   Terminals	Condition		Resistance (kΩ)
   1 and 2	Temperature [°C (°F)]	20 (68)	2.37 – 2.63
   		50 (122)	0.68 – 1.00
   		90 (194)	0.236 – 0.260

Is the inspection result normal?

INSPECTION END

Proceed to Diagnosis Procedure.

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.

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.

PERFORM DTC CONFIRMATION PROCEDURE

1. Move the Nissan Murano 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 Nissan Murano vehicle for 12 hours.

   CAUTION:

   Never turn ignition switch ON during this procedure.

   NOTE:

   The Nissan Murano vehicle must be cooled with the hood open.

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

   CAUTION:

   Never turn ignition switch OFF during idling.

4. Check 1st trip DTC.

Is 1st trip DTC detected?

Proceed to Diagnosis Procedure.

To check malfunction symptom before repair: Refer to Intermittent Incident.

Confirmation after repair: INSPECTION END

CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

Check ECT sensor. Refer to Component Inspection.

Is the inspection result normal?

INSPECTION END

Replace ECT sensor. Refer to Exploded View.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

1. Turn ignition switch OFF.

2. Disconnect engine coolant temperature sensor harness connector.

3. Remove engine coolant temperature sensor. Refer to Exploded View.

4. Check resistance between engine coolant temperature sensor terminals as per the following.

   

Is the inspection result normal?

INSPECTION END

Replace engine coolant temperature sensor. Refer to Exploded View.