For 1990-2009 cars

# 1991 - 1997 POWERTRAIN CONTROL MODULE (PCM) & ANTILOCK BRAKE

#### SUBJECT: 1991-1998 Powertrain Control Module (PCM) and Antilock Brake System (ABS) EEPROM Listing (Information)

#### MODELS: 1991-1998 Saturns Due to additions and changes to 1995-1997 vehicles and addition of 1998 vehicles, this bulletin supercedes bulletin 96-T-46, which should be discarded.

#### PURPOSE:

The attached charts summarize 1991-1998 Saturn powertrain control module (PCM) engine, transaxle and antilock brake controller electrically erasable/programmable read-only memory (EEPROM) calibrations released to date.

When any diagnosis leads to EEPROM calibration, the Saturn service stall system (SSS) EEPROM reprogramming feature will provide a list of valid EEPROM calibrations for the vehicle and allow you to select the appropriate one for reprogramming. The EEPROM calibrations listed on the attached charts may vary from the service stall selections if updates are made by satellite or CD -ROM prior to updating this bulletin.

#### IMPORTANT: Model year 1996 powertrain control modules and ABS controller are being discontinued and will be back serviced with model year 1997 PCMs and ABS controllers, software and calibrations. When stock of 1996 PCMs and ABS controllers is depleted, they will be serviced with 1997 PCMs and ABS controllers.

EEPROM calibration changes may be made for many different reasons. For instance, a calibration change may be made in conjunction with component changes, for a change relative to a current field condition, or as a production running change to provide minor modifications affecting driveability or fuel economy. Also, replacement of a PCM or ABS controller will require reprogramming of the service replacement part. Service part PCMs and and 1991-1997 ABS controllers must be reprogrammed with options and EEPROM and EEPROM calibrations before they will function properly.

#### IMPORTANT: 1998 ABS controllers do not require reprogramming. The new service ABS controllers have been programmed from the supplier.

Where applicable, always refer to the specific technical information bulletin listed for details about the symptom that may require an EEPROM calibration change.

The illustrations on the next two pages explain how to read the attached charts.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.