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. , "DTC Logic".
- 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
With CONSULT-III
1. Turn ignition switch ON.
2. Select "DATA MONITOR" mode of "ENGINE" using CONSULT-III.
3. Check that "COOLANT TEMP/S" is above 10�C (50�F).
With GST
Follow the procedure "With CONSULT-III" above.
Is it above 5�C (41�F)?
YES - INSPECTION END
NO - GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
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.
With GST
Follow the procedure "With CONSULT-III" above.
Is 1st trip DTC detected?
YES - Proceed to SEE Diagnosis Procedure.
NO - INSPECTION END




Diagnosis Procedure
1.CHECK ENGINE COOLANT TEMPERATURE SENSOR
Check the engine coolant temperature sensor. SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 2.
NO - Replace engine coolant temperature sensor. Exploded View.
2.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 - Check intermittent incident. Intermittent Incident.
NO - Repair or replace thermostat. Removal and Installation.




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?
YES - INSPECTION END
NO - Replace engine coolant temperature sensor. Exploded View.