P0125

P0125 ECT SENSOR

DTC Logic


DTC DETECTION LOGIC

NOTE:
If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117 or
P0118. P0117.






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

1.Turn ignition switch ON.
2.Select "DATA MONITOR" mode with CONSULT.
3.Check that "COOLANT TEMP/S" is above 5�C (23�F).
Is the temperature above 5�C (23�F)?
YES- INSPECTION END
NO- GO TO 3.

3. PERFORM DTC CONFIRMATION PROCEDURE

1.Start engine and run it for 65 minutes at idle speed.
If "COOLANT TEMP/S" increases to more than 5�C (23�F) within 65 minutes, stop engine because the test result will be OK.

CAUTION:
Be careful not to overheat engine.
2.Check 1st trip DTC.
Is 1st trip DTC detected?
YES-
NO- INSPECTION END


Diagnosis Procedure


1. CHECK GROUND CONNECTION

1.Turn ignition switch OFF.
2.Check ground connection M95. Refer to Ground Inspection in Circuit Inspection.
Is the inspection result normal?
YES- GO TO 2.
NO- Repair or replace ground connection.

2. CHECK ENGINE COOLANT TEMPERATURE SENSOR

.
Is the inspection result normal?
YES- GO TO 3.
NO- Replace engine coolant temperature sensor. 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. Removal And Installation.

4. CHECK INTERMITTENT INCIDENT

Intermittent Incident.
- INSPECTION END


Component Inspection


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. Exploded View.





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
Exploded View.