PCM - MIL ON/DTC P0171 in PCM Memory

BULLETIN NO.: 97-T-29

ISSUE DATE: July, 1997

GROUP/SEQ. NO.: Engine-05

CORPORATION NO.: 786003

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.)

CLAIM INFORMATION:

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

Case Type Description Labor Operation Code Time

VW Install New PCM Calibration T9753 0.3 hrs