OBD SYSTEM IMPROVEMENTS (RE-FLASH CALIBRATION). Cadillac Seville 1998

SUBJECT: ON-BOARD DIAGNOSTIC (OBD) SYSTEM IMPROVEMENTS (RE-FLASH CALIBRATION)

MODELS: 1998 CADILLAC CONCOURS, DEVILLE, ELDORADO, SEVILLE 1998 OLDSMOBILE AURORA WITH 4.0L OR 4.6L ENGINE (VINS C, Y, 9 - RPOS L47, LD8, L37)

ALTHOUGH THE SUBJECT VEHICLES HAVE BEEN CERTIFIED AS COMPLYING WITH THE APPLICABLE U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA) AND CALIFORNIA AIR RESOURCES BOARD (CARB) ON-BOARD DIAGNOSTIC (OBD) REQUIREMENTS, WE HAVE IDENTIFIED AN OBD SYSTEM IMPROVEMENT THAT SHOULD BE IMPLEMENTED WHENEVER PRACTICAL.

CONDITION:

ENGINE EGR OPERATION MAY BE INADVERTENTLY DISABLED BY THE SETTING OF DTC P 1189--ENGINE OIL PRESSURE SWITCH CIRCUIT.

CAUSE:

VEHICLES WERE PRODUCED WITH SOFTWARE WHICH MAY INADVERTENTLY DISABLE EGR OPERATION.

CORRECTION:

USE A TECH II SCAN TOOL TO VERIFY WHAT SOFTWARE CALIBRATION IS PRO- GRAMMED INTO THE VEHICLE'S PCM. IF THE IMPROVED CALIBRATION HAS NOT BEEN INSTALLED, RE-FLASH THE PCM WITH THE UPDATED CALIBRATION LISTED IN THIS BULLETIN.

CALIBRATION INFORMATION:

THE CALIBRATIONS LISTED ARE FLASH CALIBRATIONS AND ARE NOT AVAILABLE FROM GMSPO. THE CALIBRATIONS ARE PROGRAMMED INTO THE VEHICLE'S PCM VIA A TECHLINE TOOL DEVICE AND ARE AVAILABLE FROM GENERAL MOTORS SERVICE TECHNOLOGY GROUP (STG) STARTING WITH 1998 DISC 18.

NEW CALIBRATION ENGINE NUMBER RPO DESCRIPTION

09369826 LD8 U.S. AND CANADIAN CADILLAC ELDORADO BASE 09369836 LD8 U.S. AND CANADIAN CADILLAC DE VILLE BASE 09369846 L37 U.S. AND CANADIAN CADILLAC ETC WITH "Z" TIRES 09369856 L37 U.S. AND CANADIAN CADILLAC ELDORADO, DE VILLE CONCOURS WITH "H" TIRES 09369866 L47 U.S. AND CANADIAN OLDSMOBILE AURORA 09369876 L47 U.S. AND CANADIAN OLDSMOBILE AURORA WITH FV4 OPTION 09369886 LD8 U.S. AND CANADIAN CADILLAC SEVILLE BASE 09369896 L37 U.S. AND CANADIAN CADILLAC SEVILLE STS WITH "Z" TIRES 09369906 L37 U.S. AND CANADIAN CADILLAC SEVILLE WITH WITH "H" TIRES 09369916 LD8 U.S. AND CANADIAN CADILLAC LIMOUSINE/ FUNERAL COACH

IMPORTANT: INFORM CUSTOMERS THAT THIS WORK IS BEING PERFORMED ON THEIR VEHICLES TO IMPROVE ON-BOARD DIAGNOSTIC SYSTEM OPERATION AND DOES NOT AFFECT VEHICLE DURABILITY, RELIABILITY OR PERFORMANCE.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION DESCRIPTION LABOR TIME J6355 PROM-REPROGRAMMING ON CAR USE PUBLISHED LABOR OPERATION TIME

IMPORTANT: THIS LABOR OPERATION IS COVERED UNDER EITHER THE FEDERAL OR CALIFORNIA EMISSION CONTROL SYSTEM WARRANTY (WHICHEVER APPLIES) OR THE BUMPER-TO-BUMPER COVERAGE IN THE NEW VEHICLE LIMITED WARRANTY. THE WARRANTY WITH THE BROADEST COVERAGE APPLIES.

FIGURES: 00 ATTACHMENTS: 00

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.