Powertrain Control Module (PCM)
WARNING: This page is about a different car, the 2006 Mercury Grand Marquis and 2006 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.
The PCM uses the controller area network (CAN). The PCM controls the engine for better fuel economy, emissions control and failure mode detection storage. The PCM also controls all of the passive anti-theft system (PATS) functions.
Check the CAN circuits between the PCM C175b and the data link connector (DLC) C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the CAN, damage to the DLC C251, damage to the PCM C175b, or a problem in the in-line connector.
For additional PCM information, REFER to the INTRODUCTION - GASOLINE article for diagnosis and testing of the PCM.
For additional PATS information, refer to ANTI-THEFT - PATS .