Circuit/System Testing
- Leave the ignition OFF for greater than 7 hours.
- Ignition ON, verify that the IAT sensor parameter and the ECT sensor parameter are within 10°C (18°F) of the ambient air temperature.
- If greater than the specified value, test the signal circuit of the appropriate sensor for high resistance. If the circuit tests normal, test the operation of appropriate temperature sensor.
- If all circuits and the sensor test normal, replace the PCM.