Note. Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION ).
- Start the engine, and let it idle.
- Check the ECT SENSOR in the DATA LIST with the HDS. Is about 86°F (30°C) or less, or 2.61 V or more indicated? YES - Go to step 3. NO - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system (see THERMOSTAT TEST ).
- Let the engine idle for 6 minutes.
- Check the ECT SENSOR in the DATA LIST with the HDS. Is about 86°F (30°C) or less, or 2.61 V or more indicated? YES - Go to step 5. NO - Intermittent failure, system is OK at this time. Check the thermostat and the cooling system (see THERMOSTAT TEST ).
- Turn the ignition switch OFF.
- Replace the ECT sensor (see ECT SENSOR/ECT SENSOR 1 REPLACEMENT ).
- Turn the ignition switch ON (II).
- Reset the ECM/PCM with the HDS.
- Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE ).
- Allow the engine to cool to between 23°F (-5°C) and 77°F(25°C).
- Start the engine, and let it idle for 20 minutes.
- Check for Temporary DTCs or DTCs 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.
- 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.