Cautions When Servicing PCM

CAUTION: The EEPROM is not serviceable and should not be removed for replacement. If the PCM is removed from the vehicle, reprogramming of the EEPROM will be necessary. Reprogramming of the EEPROM is only possible with the Service Stall System (SSS) hardware available at authorized dealer locations. Check with a Saturn dealer before performing PCM or EEPROM replacement.




PURPOSE
The PCM EEPROM stores vehicle information such as engine and transaxle calibrations. Vehicle Identification Number, programmable vehicle option content and Malf history.

Vehicle information stored on the PCM EEPROM has a major effect on how the vehicle will operate.


DEFINITION
The term EEPROM Reprogramming means to electronically change the contents of the Electronically Erasable Programmable Read Only Memory (EEPROM) in the PCM.

REPROGRAMMING THE EEPROM
Reprogramming of PCM EEPROM information is necessary when replacing a PCM, or when changing the engine and/or transaxle calibrations. It is essential that a replacement PCM be reprogrammed with the correct VIN. option content, tire size, and calibration information.

The Saturn Service Stall System provides a means of reprogramming PCM EEPROM. Check with Saturn for this function.