DTC P0117
- Turn ON the ignition, with the engine OFF.
- Disconnect the ECT sensor.
- Observe the ECT Sensor parameter with a scan tool.
- If the ECT Sensor parameter is less than -39°C (-38°F), then replace the ECT sensor.
- If the ECT Sensor parameter is more than 149°C (300°F), then test the ECT sensor signal circuit for a short to ground.
- If the ECT sensor signal circuit tests normal, then replace the ECM.