P0125

DTC P0125: ECT Sensor Malfunction/Slow Response

1. Start the engine, and let it idle.
2. Check the ECT SENSOR in the DATA LIST with the HDS.

Is about 86 °F (30 °C) or less, or 2.61 V or higher indicated?

YES - Go to step 3.

NO - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.

3. Let the engine idle for 6 minutes.
4. Check the ECT SENSOR in the DATA LIST with the HDS.

Is about 86 °F (30 °C) or less, or 2.61 V or higher indicated?

YES - Go to step 5.

NO - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system.

5. Turn the ignition switch OFF.
6. Replace the ECT sensor.
7. Turn the ignition switch ON (II).
8. Reset the ECM/PCM with the HDS.
9. Do the ECM/PCM idle learn procedure.
10. Allow the engine to cool between 23 °F ( -5 °C) and 77 °F (25 °C).
11. Start the engine, and let it idle for 20 minutes.
12. Check for Temporary DTCs or DTCs in the DTCs MENU with the HDS.

Are any Temporary DTCs or DTCs indicated?

YES - If DTC P0125 is indicated, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting.

NO - Go to step 13.

13. Monitor the OBD STATUS for DTC P0125 in the DTCs MENU with the HDS.

Does the screen indicate PASSED?

YES - Troubleshooting is complete.

NO - If the screen indicates FAILED, check for poor connections or loose terminals at the ECT sensor and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 10 and recheck.