P0118
DTC P0118: ECT Sensor Circuit High Voltage1. Turn the ignition switch ON (II).
2. Check the ECT with the 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/PCM.
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 with the 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. Remove the jumper wire.
10. Connect ECM/PCM connector terminals A10 and B8 with a jumper wire.
11. Turn the ignition switch ON (II).
12. Check the ECT with the scan tool or the HDS.
Is -4 °F (-20 °C) or less, or 5 V indicated?
YES - Update the ECM/PCM if it does not have the latest software, or substitute a known-good ECM/PCM then recheck. If the symptom/indication goes away with a known-good ECM/PCM, replace the original ECM/PCM.
NO - Repair open in the wire between the ECM/PCM (A10, B8) and the ECT sensor.