Test Step 1 - Compare Temperature Sensor Values

• Turn the ignition off.
• Allow the vehicle to sit with the ignition off in an environment where the temperature is consistent and more than -7 °C (19.4 °F) until the engine coolant temperature is equal to ambient temperature.
• Turn the ignition on.
• Using a thermometer, measure and record the underhood and ambient temperatures.
• With a scan tool, read the ambient air temperature, engine coolant temperature, engine oil temperature, and intake air temperature sensor values, as applicable.

Are all temperature sensor values within 10 °C (18 °F) of the thermometer and the other sensor values?

Yes

• Test complete.
• Perform the PCM Verification Test. Refer to PCM VERIFICATION TEST .

No

• Go to Test Step TEST STEP 2 - TEMPERATURE SENSOR WIRING AND CONNECTORS .