P0118
DTC P0118: ECT Sensor Circuit High Voltage1. Turn the ignition switch ON (II).
2. Check the ECT SENSOR in the DATA LIST with the HDS.
Is about -40 °F (-40 °C) or less, or 4.90 V or higher indicated?
YES - Go to step 3.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the ECT sensor and the PCM.
3. Turn the ignition switch OFF.
4. Disconnect the ECT sensor 2P connector.
5. Connect ECT sensor 2P connector terminals No.1 and No.2 with a jumper wire.
6. Turn the ignition switch ON (II).
7. Check the ECT SENSOR in the DATA LIST with the HDS.
Is about -40 °F (-40 °C) or less, or 4.90 V or higher indicated?
YES - Go to step 8.
NO - Go to step 16.
8. Turn the ignition switch OFF.
9. Remove the jumper wire.
10. Turn the ignition switch ON (II).
11. Measure voltage between ECT sensor 2P connector terminal No.1 and body ground.
Is there about 5 V?
YES - Repair open in the wire between the PCM (A28) and the ECT sensor, then go to step 18.
NO - Go to step 12.
12. Turn the ignition switch OFF.
13. Jump the SCS line with the HDS.
14. Disconnect PCM connector A (73P).
15. Check for continuity between PCM connector terminal A4 and ECT sensor 2P connector terminal No.1.
Is there continuity?
YES - Go to step 22.
NO - Repair open in the wire between the PCM (A4) and the ECT sensor, then go to step 18.
16. Turn the ignition switch OFF.
17. Replace the ECT sensor.
18. Turn the ignition switch ON (II).
19. Clear the DTC with the HDS.
20. Do the PCM idle learn procedure.
21. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0118 is indicated, check for poor connections or loose terminals at ECT sensor and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - Troubleshooting is complete.
22. Update the PCM if it does not have the latest software, or substitute a known-good PCM.
23. Check for Temporary DTCs or DTCs with the HDS.
Are any Temporary DTCs or DTCs indicated?
YES - If DTC P0118 is indicated, check for poor connections or loose terminals at ECT sensor and the PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting.
NO - If the PCM was updated, troubleshooting is complete. If the PCM was substituted, replace the original PCM.