P0125

Reference Data:

Component Description

NOTE: If DTC P0125 (0908) is displayed with P0115 (0103), first perform trouble diagnosis for DTC P0115.

The engine coolant temperature sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the ECM. The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.

Do not use ECM ground terminals when measuring input/ output voltage. Doing so may lead to ECM's transistor damage. Use ground other than ECM, such as engine ground.

Consult-II Reference Value In Data Monitor Mode:

On Board Diagnosis Logic:

DTC Confirmation Procedure

CAUTION: Be careful not to overheat engine.

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

With CONSULT-II
1. Turn ignition switch "ON".
2. Select "DATA MONITOR" mode with CONSULT-II.




3. Check that "COOLAN TEMP/S" is above 10 °C (50 °F).

If it is above 10 °C (50 °F), the test result will be OK. If it is below 10 °C (50 °F), go to following step.

4. 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.

5. If 1st trip DTC is detected, go to "Diagnostic Procedure" below.

With GST
Follow the procedure "With CONSULT-II" above.

EC-ECTS-01:

EC-ECTS-01 Connector View:

Wiring Diagram

Diagnostic Procedure Steps 1 - 4:

Diagnostic Procedure Steps 5 - 7:

Diagnostic Procedure

Component Inspection

Reference Data:

Check resistance as shown in the figure.
If NG, replace engine coolant temperature sensor.