Powertrain Control Module (PCM)

The PCM is on the controller area network (CAN). The PCM controls the engine for better fuel economy, emissions control, failure mode detection and storage. If one of the communications network circuits become shorted to ground or voltage, or if some but not all termination resistors are lost, communications can continue. Check the communications network circuits 1827 (WH/LG) and 1828 (PK/LG) between the PCM C175a (gasoline) or PCM C176a (diesel) 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 C175a (gasoline), damage to the PCM C176a (diesel) or a problem in the in-line connector. For additional information, refer to the INTRODUCTION - GASOLINE article.