PCM EEPROM

Purpose:
The PCM EEPROM stores vehicle information such as engine and transaxle calibrations, Vehicle identification number (VIN), programmable vehicle option content and malfunction history.

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

Reprogramming:
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 term EEPROM Reprogramming means to electronically change the contents of the electronically erasable programmable read only memory (EEPROM) in the PCM.

Saturn's service stall system (SSS) provides a means of reprogramming PCM EEPROM through the System Utilities Main Menu function. The "Service Stall System User's Guide" and/or system help (F1 = HELP) feature provides the procedure to follow for EEPROM reprogramming.