Cobalt L4-2.0L SC VIN P (2005)
PROM - Programmable Read Only Memory: All Technical Service Bulletins
Engine Controls - SES Lamp ON/DTC P0171 Set
Bulletin No.: 06-06-04-033
Date: June 21, 2006
TECHNICAL
Subject:
L61 Engine Malfunction Indicator Lamp (MIL)/Service Engine Soon (SES) Lamp Illuminated with DTC P0171 "Fuel Trim System Lean" Set
(Reprogram ECM)
Models:
2005-2006 Chevrolet Cobalt, Cobalt SS Supercharged
2006 Chevrolet HHR
2004-2006 Chevrolet Malibu
2005-2006 Pontiac Pursuit (Canada Only)
2004-2005 Saturn ION Redline
2005-2006 Saturn ION
with Ecotec(TM) 2.0L or 2.2L I-4 Engine (VINs P, F - RPOs LSJ, L61)
Condition
Some customer may comment that the MIL/SES lamp is Illuminated. Further diagnostic investigation with a scan tool may reveal a DTC P0171 Fuel
Trim System Lean. No other driveability or performance concerns may be reported.
Cause
The most likely cause of this issue may be that the engine calibrations need to be updated to correct a variation in the Mass Air Flow Sensor.
Correction
DO NOT replace the MAF sensor, the ECM or any other parts.
Important:
^
Chevrolet/Pontiac Dealers: The ECM calibration is available to dealerships as part of TIS2000 incremental satellite update version 6.5,
which was broadcast to dealers June 12, 2006 or later. For the dealerships that use CDs, they were mailed out June 2006 or later.
^
Saturn Retailers: Before installing the new ECM calibration, make sure the Saturn Service Stall (SSS) version is TIS 6.5 2006 or later.
^
While the ignition is OFF, apply the parking brake to disable the daytime running lights (DRLs) prior to starting reprogramming
procedures
^
The technician must select the "Reprogram" option in order to reprogram the ECM.
Reprogram the ECM with the latest calibration. This calibration, or any that follow, is designed to address this DTC P0171 concern. Refer to
Service Programming System (SPS) in SI for reprogramming procedures. As always, make sure your Tech 2(R) is updated with the latest software
version.
Warranty Information
