Nissan Rogue Service Manual: P0125 ECT sensor

Nissan Rogue Service Manual / Engine / Engine Control System / DTC/Circuit diagnosis / P0125 ECT sensor

DTC Description

DTC DETECTION LOGIC

DTC No.	CONSULT screen terms (Trouble diagnosis content)	DTC detecting condition
P0125	ECT SENSOR (Insufficient coolant temperature for closed loop fuel control)	Voltage sent to ECM from the sensor is not practical, even when some time has passed after starting the engine. Engine coolant temperature is insufficient for closed loop fuel control.

POSSIBLE CAUSE

Harness or connectors (High resistance in the circuit)
Engine coolant temperature sensor
Thermostat

FAIL-SAFE

Not applicable

DTC CONFIRMATION PROCEDURE

1.CHECK DTC PRIORITY

If DTC P0125 is displayed with DTC P0116 or P0117, first perform the trouble diagnosis for DTC P0116 or P0117.

Is applicable DTC detected? YES >> Perform diagnosis of applicable. Refer to EC-93, "DTC Index".

NO >> GO TO 2.

2.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test.

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

>> GO TO 3.

3.CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION

With CONSULT

Turn ignition switch ON.
Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
Check that “COOLAN TEMP/S” is above 10°C (50°F).

With GST

Follow the procedure “With CONSULT” above.

Is it above 5°C (41°F)? YES >> INSPECTION END

NO >> GO TO 4.

4.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT

Start engine and run it for 65 minutes at idle speed.
Check 1st tip DTC.

If “COOLAN TEMP/S” indication increases to more than 10°C (50°F) within 65 minutes, stop engine because the test result will be OK.

CAUTION: Be careful not to overheat engine. With GST

Follow the procedure “With CONSULT” above.

Is 1st trip DTC detected? YES >> Proceed to EC-220, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK DTC PRIORITY

If DTC P0125 is displayed with DTC P0116 or P0117, first perform the trouble diagnosis for DTC P0116 or P0117.

Is applicable DTC detected? YES >> Perform diagnosis of applicable. Refer to EC-93, "DTC Index".

NO >> GO TO 2.

2.CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check the engine coolant temperature sensor. Refer to EC-212, "Component Inspection".

Is the inspection result normal? YES >> GO TO 3.

NO >> Replace engine coolant temperature sensor. Refer to CO-23, "Exploded View".

3.CHECK THERMOSTAT OPERATION

When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine coolant does not flow.

Is the inspection result normal? YES >> GO TO 4.

NO >> Repair or replace thermostat. Refer to CO-21, "Removal and Installation".

4.CHECK INTERMITTENT INCIDENT

Refer to GI-41, "Intermittent Incident".

>> INSPECTION END

Component Inspection

1.CHECK ENGINE COOLANT TEMPERATURE (ECT) SENSOR

Turn ignition switch OFF.
Disconnect ECT sensor harness connector.
Remove ECT sensor.
Check resistance between ECT sensor terminals by heating with hot water as shown in the figure.

Check engine coolant temperature (ECT) sensor

Is the inspection result normal? YES >> INSPECTION END

NO >> Replace engine coolant temperature sensor. Refer to CO-23, "Exploded View".

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