P0118
DTC P0118: ECT Sensor Circuit High Voltage1. Turn the ignition switch ON (II).
2. Check the ECT with the scan tool.
Is 4 °F (- 20 °C) or less (or L-Limit in Honda mode of PGM Tester), or 5 V indicated?
YES - Go to step 3.
NO - Intermittent failure, system is OK at this time. Check for poor connections or loose wires at the ECT sensor and the ECM/PCM.
3. Disconnect the ECT sensor connector.
4. Connect ECT sensor 2P connector terminals No.1 and No.2 with a jumper wire.
5. Check the ECT with the scan tool.
Is - 4 °F (-20 °C) or less (or L-Limit in Honda mode of PGM Tester), or 5 V indicated?
YES - Go to step 6.
NO - Replace the ECT sensor.
6. Turn the ignition switch OFF.
7. Connect ECM/PCM connector terminals C18 and C26 with a jumper wire.
8. Turn the ignition switch ON (II).
9. Check the ECT with the scan tool.
Is -4 °F (-20 °C) or less (or L-Limit in Honda mode of PGM Tester), or 5 V indicated?
YES - Substitute a known-good ECM/PCM and recheck. If normal voltage is indicated, replace the original ECM/PCM.
NO - Repair open in the wire between the ECM/PCM (C18, C26) and the ECT sensor.