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 ECM/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 13.
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 ECM/PCM (D10) and the ECT sensor, then go to step 15.
NO - Go to step 12.
12. Measure voltage between ECM/PCM connector terminal D17 and body ground.
Is there about 5 V?
YES - Repair open in the wire between the ECM/PCM (D17) and the ECT sensor, then go to step 15.
NO - Go to step 19.
13. Turn the ignition switch OFF.
14. Replace the ECT sensor.
15. Turn the ignition switch ON (II).
16. Reset the ECM/PCM with the HDS.
17. Do the ECM/PCM idle learn procedure.
18. 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 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's troubleshooting.
NO - Troubleshooting is complete.
19. Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM.
20. 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 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's troubleshooting.
NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.