| DTC P0118: | ECT Sensor Circuit High Voltage |
| 1. | Turn the ignition switch ON (II). |
| 2. | Check the ECT SENSOR in the DATA LIST with the Honda PGM Tester or the HDS. Is about -40°C (-40°F) or less, or 4.90 V or higher indicated? YES - Go to 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.n |
| 3. | Turn the ignition switch OFF. |
| 4. | Disconnect the ECT sensor 2P connector. |
| 5. | Connect the 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 Honda PGM Tester or the HDS. Is about -40°C (-40°F) or less, or 4.90 V or higher indicated? YES - Go to 8. NO - Go to 13. |
| 8. | Turn the ignition switch OFF. |
| 9. | Remove the jumper wire. |
| 10. | Turn the ignition switch ON (II). |
| 11. | Measure voltage between the 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 (A23) and the ECT sensor, then go to 15. NO - Go to 12. |
| 12. | Measure voltage between ECM/PCM connector terminal B8 and body ground. Is there about 5 V? YES - Repair open in the wire between the ECM/PCM (B8) and the ECT sensor, then go to 15. NO - Go to 19. |
| 13. | Turn the ignition switch OFF. |
| 14. | Replace the ECT sensor. |
| 15. | Turn the ignition switch ON (II). |
| 16. | Do the ECM/PCM RESET in the CLEAR MENU with the Honda PGM Tester or the HDS. |
| 17. | Do the ECM/PCM idle learn procedure. |
| 18. | Check for Temporary DTCs or DTCs in the DTCs MENU with the Honda PGM Tester or 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 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - Troubleshooting is complete.n |
| 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 in the DTCs MENU with the Honda PGM Tester or 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 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC troubleshooting. NO - If the ECM/PCM was updated, troubleshooting is complete. If the ECM/PCM was substituted, replace the original ECM/PCM.n |