Carry Out On-Board Diagnostic (OBD) (Key ON Engine OFF (KOEO), Key ON Engine Running (KOER))
WARNING: This page is about a different car, the 2009 Mercury Milan and 2009 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
After a road test, with the vehicle warm and before disconnecting any connectors, carry out the Quick Test using diagnostic tool. Refer to the Introduction - Gasoline Engines article for diagnosis and testing of the PCM.