Powertrain Control Module (PCM) and Flashing the EPROM

IMPORTANT: The service PCM will not contain the final program information. After PCM installation, the EEPROM must be flashed using the approved tools/equipment, and procedures.

This powertrain has very complex components with equally complex operating characteristics. Therefore, it is essential that the Powertrain diagnostic procedures given in this and other service manual sections be used for diagnosis before any repairs are made. While the PCM may appear on the surface to be the source of a problem, it may, in fact, be operating properly based on incorrect input. Powertrain diagnostic procedures are designed to arrive at the CORRECT repair as QUICKLY as possible. DO NOT, under any circumstances, replace a PCM unless directed to do so by diagnostic procedures in the service manual, other service information sources, or through technical assistance.

Service of the PCM will consist of replacement of the PCM and flashing the EEPROM. If a diagnostic procedure calls for the PCM to be replaced, the PCM should be checked first to see if it is the correct part. When flashing the EEPROM, refer to the latest service publications for updated programming procedures and information.