P0118
DTC P0118: ECT Sensor Circuit High VoltageNOTE: Before you troubleshoot, record all freeze data and review the general troubleshooting information.
1. Turn the ignition switch ON (II).
2. Check the ECT with a scan tool or the HDS.
Is -4 degree F (-20 degree 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 -4degree F (-20 degree C) or less, or 5 Vindicated?
YES - Go to step 8.
NO - Replace the ECT sensor.
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. 2 and body ground.
Is there about 5 V?
YES - Go to step 13.
NO - Go to step 12.
12. Measure voltage between ECM connector terminal C26 and body ground.
Is there about 5 V?
YES - Repair open in the wire between the ECM (C26)and the ECT sensor.
NO - Substitute a known-good ECM and recheck. If normal ECT is indicated, replace the original ECM.
13. Turn the ignition switch OFF.
14. Disconnect ECM connector C (31P).
15. Connect ECT sensor 2P connector terminal No. 1 to body ground with a jumper wire.
16. Check for continuity between ECM connector terminal C18 and body ground.
Is there continuity?
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)and the ECT sensor.