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Nissan Sentra Service Manual: P0125 ECT Sensor

Nissan Sentra Service Manual / Engine / Engine control system / Dtc/circuit diagnosis / P0125 ECT Sensor

DTC Logic

DTC DETECTION LOGIC

NOTE:

DTC No.

 CONSULT screen terms (Trouble diagnosis content)

 DTC detecting condition

 Possible cause
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.
  • Harness or connectors (High resistance in the circuit)
  • Engine coolant temperature sensor
  • Thermostat

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.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 10°C (50°F).

Follow the procedure “With CONSULT” above. With GST


Follow the procedure “With CONSULT” above.

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

NO >> GO TO 3.

3.PERFORM DTC CONFIRMATION PROCEDURE

With CONSULT


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

If “COOLANT 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.

Follow the procedure “With CONSULT” above. With GST


Follow the procedure “With CONSULT” above.

Is 1st trip DTC detected? YES >> Proceed to EC-203, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check the engine coolant temperature sensor. Refer to EC-197, "Component Inspection".

Is the inspection result normal? YES >> GO TO 2.

NO >> Replace engine coolant temperature sensor. Refer to CO-24, "Exploded View".

2.CHECK THERMOSTAT OPERATION

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

Is the inspection result normal? YES >> Check intermittent incident. Refer to GI-39, "Intermittent Incident".

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

Component Inspection

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?


Is the inspection result normal? YES >> INSPECTION END

NO >> Replace engine coolant temperature sensor. Refer to CO-24, "Exploded View".

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