P0125

P0125 ECT SENSOR

DTC Logic


DTC DETECTION LOGIC

NOTE:
-If DTC P0125 is displayed with P0116, first perform the trouble diagnosis for DTC P0116. Refer to EC738, "DTC Logic".
-If DTC P0125 is displayed with P0117 or P0118, first perform the trouble diagnosis for DTC P0117, P0118. Refer to "DTC Logic" P0117.






DTC CONFIRMATION PROCEDURE


1. PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following 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 with CONSULT.
3.Check that "COOLAN TEMP/S" is above 10�C (50�F).
With GST
Follow the procedure "With CONSULT" above.
Is the temperature above 10�C (50�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.
If "COOLAN TEMP/S" increases to more than 10�C (50�F) within 65 minutes, stop engine because the test result will be OK.

CAUTION:
Never overheat engine.
2.Check 1st trip DTC.
With GST
Follow the procedure "With CONSULT" above.
Is 1st trip DTC detected?
YES-"Diagnosis Procedure"
NO- INSPECTION END


Diagnosis Procedure


1. CHECK ENGINE COOLANT TEMPERATURE SENSOR

Check engine coolant temperature sensor. Refer to "Component Inspection" .
Is the inspection result normal?
YES- GO TO 2.
NO- Replace engine coolant temperature sensor.

2. CHECK THERMOSTAT OPERATION

When the engine is cold [lower than 70�C (158�F)] condition, grasp lower radiator hose and confirm that the engine coolant does not flow.
Is the inspection result normal?
YES- Check intermittent incident. Refer to "Intermittent Incident" Intermittent Incident.
NO- Repair or replace thermostat. Refer to "Removal and Installation" Removal And Installation.


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. Refer to "Removal and Installation" Removal And Installation.





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





Is the inspection result normal?
YES- INSPECTION END
NO- Replace engine coolant temperature sensor. Refer to "Removal and Installation" Removal And Installation.