P0118
DTC P0118: ECT Sensor Circuit High Voltage1. Turn the ignition switch ON (II).
2. Check the ECT with a scan tool or the HDS.
Is -4 °F (-20 °C) or less or 5 V 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 at the ECM.
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 with a scan tool or the HDS.
Is -4 °F (-20 °C) or less or 5 V indicated?
YES - Go to step 8.
NO - Replace the ECT sensor.
8. Turn the ignition switch OFF.
9. Connect ECM connector terminals C18 and C26 with a jumper wire.
10. Turn the ignition switch ON (II).
11. Check the ECT with a scan tool or the HDS.
Is -4 °F (-20 °C) or less or 5 V indicated?
YES - Substitute a known-good ECM and recheck. If normal ECT is indicated, replace the original ECM.
NO - Repair open in the wire between the ECM (C18, C26)and the ECT sensor.