SW1 L4-1.9L SOHC VIN 8 (1996)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
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."
