Nissan Sentra B18 (2020-2025) Service Manual / Engine / Work Procedure (After Replacing Electric Throttle Control Actuator) / Dtc/circuit Diagnosis / P0125 Ect Sensor

Nissan Sentra B18 (2020-2025) Service Manual: P0125 Ect Sensor

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC	CONSULT screen terms (Trouble diagnosis content)	DTC detection condition
P0125	ECT SENSOR (Insufficient coolant temperature for closed loop fuel control)	Diagnosis condition	—
		Signal (terminal)	Engine coolant temperature sensor signal
		Threshold	Voltage sent to ECM from the engine coolant temperature sensor is not practical, even when some time has passed after starting the engine Engine coolant temperature sensor is insufficient for closed loop fuel control
		Diagnosis delay time	—

POSSIBLE CAUSE

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

FAIL-SAFE

Not applicable

Confirmation Procedure

Confirmation Procedure

CHECK DTC PRIORITY
- If DTC P0125 is displayed with DTC P0116, first perform the trouble diagnosis for DTC P0116.
- If DTC P0125 is displayed with DTC P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or P0118.
Is applicable DTC detected?
YES >>
Perform diagnosis of applicable.
- DTC P0116: Refer to DTC Description.
- DTC P0117 or P0118: Refer to DTC Description.
NO >>
GO TO 2.
PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.

>>
GO TO 3.
CHECK ENGINE COOLANT TEMPERATURE SENSOR FUNCTION

With CONSULT
1. Turn ignition switch ON.
2. Select “DATA MONITOR” mode of “ENGINE” using CONSULT.
3. Check that “COOLANT TEMP/S” is above −4°C (25°F).
With GST

Follow the procedure “With CONSULT” above.

Is it above −4°C (25°F)?
YES-1 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
YES-2 >>
Confirmation after repair: INSPECTION END
NO >>
GO TO 4.
PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT
1. Start the engine and run it for 65 minutes at idle speed.
2. Check 1st tip DTC.
If “COOLANT TEMP/S” indication increases to more than −4°C (25°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 DTC Diagnosis Procedure.
NO-1 >>
To check malfunction symptom before repair: Refer to Intermittent Incident.
NO-2 >>
Confirmation after repair: INSPECTION END

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

CHECK DTC PRIORITY
- If DTC P0125 is displayed with DTC P0116, first perform the trouble diagnosis for DTC P0116.
- If DTC P0125 is displayed with DTC P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or P0118.
Is applicable DTC detected?
YES >>
Perform diagnosis of applicable.
- DTC P0116: Refer to DTC Description.
- DTC P0117 or P0118: Refer to DTC Description.
NO >>
GO TO 2.
CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to Component Inspection.

Is the inspection result normal?
YES >>
GO TO 3.
NO >>
Replace engine coolant temperature sensor. Refer to Exploded View.
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 >>
INSPECTION END
NO >>
Repair or replace thermostat. Refer to Removal and Installation.

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