Powertrain Control Module (PCM)

WARNING: This page is about a different car, the 2004 Mercury Mountaineer and 2004 Ford Explorer. However, it is still accessible from the selected car via links, so may be relevant.

The PCM is on the CAN and uses this network to communicate with the diagnostic tool. The PCM utilizes an internal termination resistor for normal interface with the CAN. Damage or loss of this termination resistor will result in intermittent operation and or failure of the entire CAN. The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage, all passive anti-theft system (PATS) functions, as well as all four wheel drive and speed control functions. For additional PATS information, refer to ANTI-THEFT . For additional four wheel drive information, refer to FOUR WHEEL DRIVE SYSTEMS . For additional speed control information, refer to SPEED CONTROL . Refer to INTRODUCTION - CNG, FLEX-FUEL & GASOLINE for diagnosis and testing of the PCM.