PCM CALIBRATION ENHANCEMENT. Cadillac Seville 1996

REVISION: 08/27/96

THIS BULLETIN IS BEING REVISED TO CHANGE THE WARRANTY INFORMATION. PLEASE DISCARD BULLETIN 67-65-25 (SECTION 6E-ENGINE FUEL AND EMISSION). ---------------------------------------------------------------------- REVISION: 02/20/97

THIS BULLETIN IS BEING REVISED FOR ADDITIONAL DTC CODES. PLEASE DISCARD CORPORATE BULLETIN NUMBER 67-65-25A (SECTION 6E - ENGINE FUEL AND EMISSION). ----------------------------------------------------------------------

SUBJECT: INFORMATION ON PCM CALIBRATION ENHANCEMENT

MODELS: 1996 CADILLAC DEVILLE, DEVILLE CONCOURS, ELDORADO, ELDORADO ETC, SEVILLE SLS, SEVILLE STS 1996 OLDSMOBILE AURORA WITH 4.0L, 4.6L ENGINES (VINS C, Y, 9 - RPOS L47, LD8, L37)

A PCM CALIBRATION ENHANCEMENT HAS BEEN RELEASED FOR THE 4.0L AND 4.6L ENGINES IDENTIFIED ABOVE. THIS PCM CALIBRATION ENHANCEMENT IS LOCATED ON TECHLINE CD ROM DISC # 4 1997. THIS PCM CALIBRATION CAN BE USED TO SERVICE 1996 MODEL YEAR 4.0L AND 4.6L ENGINES WITH THE FOLLOWING DTC CODES AFTER FOLLOWING THE COMPLETE INSTRUCTIONS BELOW FOR EACH DTC CODE LISTED.

DTC CODE CODE DESCRIPTION P0101 MAF CODE P0132,P0138, HEATED OXYGEN SENSOR P0152,P0154 P0300 ENGINE MISFIRE DETECTED P0325 KNOCK SENSOR MODULE CIRCUIT P1406 EGR SYSTEM P0507 IDLE SPEED HIGH P0218,P0712, TRANSMISSION TEMPERATURE SENSOR CIRCUIT P0713 P1258 ENGINE METAL OVERTEMPERATURE PROTECTION P1520 GEAR INDICATOR SYSTEM (TO SEPARATE THE USER FUNCTIONS-CADILLAC ONLY) P1810 PRESSURE SWITCH MANIFOLD MALFUNCTION P0133*,P0153* O2 RESPONSE TIME SLOW P1134*,P1154* O2 RATIO OF RESPONSE TIMES P1140* O2 RESPONSE RATIO PRE-CONVERTER O2 P0401* EGR SYSTEM MALFUNCTION * INDICATES ADDITIONAL DTC CODES TO THOSE LISTED IN BULLETIN 67- 67-65-25A.

FOR ANY DTC CODES WITHOUT ASTERISK, PROCEED TO THE PARTS INFORMATION SECTION OF THIS BULLETIN. IF ANY OF THE DTC CODES WITH ASTERISK ABOVE ARE PRESENT, CAREFULLY FOLLOW THE STEPS LISTED BELOW:

IMPORTANT: ALL DTC CODES, TECHNICIAN OBSERVATIONS AND CUSTOMER COMMENTS MUST BE RECORDED ON THE REPAIR ORDER IN ACCORDANCE WITH ARTICLE 1.6.2 G OF THE GENERAL MOTORS SERVICE POLICIES AND PROCEDURE MANUAL.

VERIFY IF THE VEHICLE HAS BEEN PREVIOUSLY UPDATED WITH AN ENHANCED CALIBRATION FROM TECHLINE CD ROM DISC # 4 1997. IF THE VEHICLE WAS UPDATED WITH AN ENHANCED CALIBRATION FROM TECHLINE CD ROM DISC #4 1997, THEN CONSULT THE DIAGNOSTIC PROCEDURES FOR THE SPECIFIC DTC CODES LISTED IN SECTION 6E OF THE APPLICABLE SERVICE MANUAL. IF THE VEHICLE WAS NOT UPDATED WITH AN ENHANCED CALIBRATION FROM TECHLINE CD ROM DISC #4 1997, THEN PROCEED TO THE SPECIFIC DTC CODE LISTED BELOW AND FOLLOW THE INSTRUCTIONS FOR THAT CODE COMPLETELY.

FOR O2 RESPONSE AND RATIO DTC CODES P0133, P0153, P1134, AND P1154: VERIFY O2 HEATER OPERATION USING THE APPROPRIATE SERVICE MANUAL SECTION 6E DIAGNOSTIC CHARTS. FOLLOW THE DTC DIAGNOSTIC CHART TO THE POINT WHERE IT RECOMMENDS REPLACING THE OXYGEN SENSOR. UPDATE PCM WITH APPLICABLE CALIBRATION LISTED IN THE PARTS INFORMATION SECTION OF THIS BULLETIN. DO NOT REPLACE OXYGEN SENSOR. VERIFY THE REPAIR USING THE TECH II DEVICE.

FOR O2 RESPONSE RATIO PRE-CONVERTER O2 DTC CODE P1140: VERIFY O2 HEATER OPERATION USING THE SERVICE MANUAL SECTION DTC DIAGNOSTIC CHART. FOLLOW THE DIAGNOSTIC CHART TO THE POINT WHERE IT RECOMMENDS REPLACING THE OXYGEN SENSOR. UPDATE PCM WITH APPLICABLE CALIBRATION LISTED IN THE PARTS INFORMATION SECTION OF THIS BULLETIN. DO NOT REPLACE OXYGEN SENSOR. VERIFY THE REPAIR USING THE TECH II DEVICE.

FOR EGR SYSTEM MALFUNCTION DTC CODE: P0401 THIS DTC CODE IS MORE LIKELY TO SET BY FREQUENT VEHICLE HOT STARTS IN HIGH AMBIENT TEMPERATURES. VERIFY THAT THERE ARE NO INDUCTION SYSTEM LEAKS. IF NO INDUCTION SYSTEM LEAKS ARE FOUND, PROCEED TO THE SERVICE MANUAL DTC DIAGNOSTIC CHART. IF AT STEP 7 OF THE DTC DIAGNOSTIC CHART, THE ANSWER IS "YES", THEN UPDATE THE PCM WITH THE APPLICABLE CALIBRATION LISTED IN THE PARTS INFORMATION SECTION OF THIS BULLETIN. VERIFY THE REPAIR USING THE TECH II DEVICE.

PARTS INFORMATION:

AFTER FOLLOWING THE SPECIFIC INSTRUCTIONS OUTLINED ABOVE, AND IF PERFORMING ALL NECESSARY PROCEDURES IN THE SERVICE MANUAL INDICATE THAT A CALIBRATION ENHANCEMENT IS REQUIRED, THEN UPDATE THE VEHICLE WITH THE APPLICABLE ENHANCED CALIBRATION LISTED BELOW:

CALIBRATION NUMBER VEHICLE DESCRIPTION

16256726 U.S. BASE CADILLAC DEVILLE/ ELDORADO/ SEVILLE SLS 16256736 EUROPEAN EXPORT SEVILLE 16256746 U. S. NOISE CONTROL SEVILLE / MEXICAN DEVILLE 16256756 U.S. CADILLAC ETC / STS WITH "Z" TIRES 16256766 U.S. CADILLAC ETC / STS CONCOURS WITH "H" TIRES 16256776 EXPORT UNLEADED CADILLAC ETC / STS WITH "Z" TIRES 16256786 EXPORT NOISE CONTROL CADILLAC ETC / STS 16256796 EXPORT NOISE CONTROL CADILLAC CONCOURS 16256806 U.S. OLDSMOBILE AURORA 16256816 U.S. OLDSMOBILE AURORA WITH FV4 OPTION 16256826 CANADIAN BASE CADILLAC DEVILLE/ ELDORADO/ SEVILLE 16256836 CANADIAN CADILLAC ETC/ STS/ CONCOURS WITH "H" TIRES 16256846 CANADIAN CADILLAC ETC/ STS WITH "Z" TIRES 16256856 CANADIAN OLDSMOBILE AURORA 16256866 CANADIAN OLDSMOBILE AURORA WITH FV4 OPTION

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

FOR ALL 1996 CADILLAC DEVILLE CONCOURS, DEVILLE, ELDORADO, SEVILLE, AND OLDSMOBILE AURORA MODELS:

LABOR OPERATION DESCRIPTION LABOR TIME

J6355 PROM, REPROGRAMMING ON CAR .4 HR.

FIGURES: 0 ATTACHMENTS: 0

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