MIL (SERVICE ENGINE SOON TELLTALE LAMP)

SUBJECT: MIL (SERVICE ENGINE SOON Telltale Lamp) On with DTC P0171 in PCM Memory (Install Service PCM Calibration)

MODELS AFFECTED: 1996-1997 Saturns

CONDITION: The malfunction indicator lamp (MIL) (SERVICE ENGINE SOON telltale lamp) may be On and diagnostic trouble code (DTC) P0171 (Learned Fuel Control - Fuel System Too Lean) is present or stored in PCM malfunction history.

CAUSE: Condition may be caused by lean operation due to fuel system component variation, which is aggravated by the use of some oxygenated and/or reformulated fuels.

CORRECTION: Install service PCM calibration if indicated in the procedures section of this bulletin.

PROCEDURES

Using a Scan tool, or the Saturn Service Stall (SSS), determine the calibration "End Model" currently loaded in the PCM.

- If the "End Model" is not the one identified in the following "PCM Calibrations (End Model)" table, then re-calibrate the PCM.

- If the "End Model" is the one identified in the following "PCM Calibrations (End Model)" table, then refer to DTC P0171 diagnostics in the appropriate year "Powertrain Controls Service Manual."

Install new PCM calibration according to the calibration in the following "PCM Calibrations (End Model)" table. (Refer to "Reprogramming EEPROM" in the "Service Stall System User Guide.")

IMPORTANT: Version 40.5 or greater service stall system (SSS) software is required for this flash process. Verify the SSS is version 40.5 or greater.

If SSS version 40.5 or greater is not available, call Saturn Customer Support Center at 1 (800) 7SATURN (1 (800) 772 - 8876), prompt 3. In Canada, call 1 (800) 828 - 6860 for English, or 1 (800) 503-3222 for French.

IMPORTANT: On 1996 vehicles, it may be necessary to perform the crankshaft learning procedure. (Refer to Technical Information Bulletin 96-T-39, and perform the Crankshaft Learning Procedure contained in the bulletin.)

PCM CALIBRATIONS (END MODEL)

Model Year 1996 - (Vehicle Equipped Emissions Engine Transaxle Model Yr 96 w/1997 Service PCM) Model Yr 97

Calif. Base (L24) Auto. 21008847 21008835 21008835 Manual 21008849 21008839 21008839 Perf (LLO) Auto. 21008832 21008832 21008833 Manual 21008837 21008837 21008837

Federal Base (L24) Auto. 21008846 21008834 21008834 Manual 21008848 21008838 21008838 Perf (LLO) Auto. 21008832 21008832 21008832 Manual 21008836 21008836 21008836

Taiwan/ Base (L24) Auto. 21008850 21008841 21008841 Canada Manual 21008851 21008843 21008843 Perf (LLO) Auto. 21008840 21008840 21008840 Manual 21008842 21008842 21008842

Japan Perf (LLO) Auto. N/A N/A 21008844 Manual N/A N/A 21008845

CLAIM INFORMATION: To receive credit for this repair during the warranty coverage period, submit a claim through the Saturn Dealer System as follows:

Labor Case Operation Type Description Code Time

VW Install New PCM Calibration T9753 0.3 hrs

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.