Mechanics

CHEVY CHECK ENGINE LIGHT

2003 Chevrolet Cavalier

2003 Chevy Cavalier 4 cyl Automatic 73K miles

Check engine light and trac off light came on about 2 years ago after oil change-car failed smog due to check engine light-repair place did check engine light check and code came back IAT sensor-replaced sensor-engine light back on-went to different repair place-same code so I replaced the sensor again-light came back on-disconnected battery-light went off and then came back on. What's going on?
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Drplfed
October 29, 2009.




Have a look at this TSB: SYSTEM SOFTWARE UPGRADE - OBD SYSTEM IMPROVEMENTS (REPROGRA.
SYSTEM SOFTWARE UPGRADE - OBD SYSTEM IMPROVEMENTS (REPROGRAM PCM) SERVICE CAMPAIGN BULLETIN Reference Number(s): 03064, Date of Issue: Dec 17, 2003 CHEVROLET: 2002-2003 Caviler (built before 37376322 or 3S207455) with 2.2L Engine (VIN F - RPO L61) OLDSMOBILE: 2002-2003 Alero with 2.2L Engine (VIN F - RPO L61) 2002-2003 Sunfire (built before 37376320 or 3S207453); 2002-2003 Pontiac PONTIAC: Grand Am with 2.2L Engine (VIN F - RPO L61) SECTION: 06 -Related Ref Number(s): 03064
ARTICLE BEGINNING
PURPOSE
SERVICE PROCEDURE
Using a Tech 2 scan tool and TIS 2000, verify whether the calibration programmed into the vehicle's PCM has been programmed since the calibration listed below or later. The GM Vehicle Inquiry System (GM VIS) may be checked to see if the vehicle has been programmed since the below calibration or the labor operation Y0002 has been claimed on the vehicle. If the below or later updated calibration has not been installed or the Y0002 labor operation has not been claimed, reprogram the ECM with the latest updated calibration from TIS 2000 version 6.5 for 2003 data update or later.
CALIBRATION PROGRAMMED

Model YearVehicleTransmissionEmissions TypeCalibration P/N 2002Cavalier/SunfireManualNationwide12583766 " " AutomaticNationwide12583768 " Grand Am/AleroManualNationwide12583772 " " AutomaticNationwide12583770 2003Cavalier/SunfireManualNationwide12583740 " " AutomaticNationwide12583742 " " " California LEV - 12583744 Natural Gas " Grand Am/AleroManualNationwide12583747 " " AutomaticNationwide12583745

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This bulletin provides information about installing new Powertrain Control Module (PCM) software and calibration on certain 2002-2003 vehicles equipped with 2.2L 4 cylinder engines. The revised calibration includes several OBD system improvements that should be installed as soon as practical. Install the new calibration on all affected vehicles identified in this bulletin, including vehicles in new dealer inventory and any vehicles that return for service, for any reason, during the applicable 8 year 80,000 mile (130,000 km) emission warranty coverage period. To verify if an updated calibration is required, refer to the following procedure in this bulletin.
10/29/2009

SYSTEM SOFTWARE UPGRADE - OBD SYSTEM IMPROVEMENTS (REPROGRA.
WARRANTY INFORMATION
For vehicles repaired under the 8 year or 80,000 mile(130,000 km) emission warranty use: WARRANTY INFORMATION

Labor Op. DescriptionLabor Time Y0002Powertrain Control Module - Reprogram0.4 hr

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Merlin2021
Oct 29, 2009.


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