SMU - SECTION 7A - AUTOMATIC TRANSMISSION / TRANSAXLE REV.. GMC Truck GMC MD Bus Chassis (B Model) 1997

SUBJECT: SERVICE MANUAL UPDATE--SECTION 7A--AUTOMATIC TRANSMISSION/ TRANSAXLE--REVISED TEXT TO ALL OF THE DIAGNOSTIC TROUBLE CODE TABLES

MODELS: 1997 BUICK CENTURY, ROADMASTER, PARK AVENUE, RIVIERA, LESABRE, SKYLARK, REGAL 1997 CADILLAC DEVILLE, CONCOURS, ELDORADO, FLEETWOOD, SEVILLE 1997 CHEVROLET BERETTA, CAMARO, CAPRICE, CAVALIER, CORSICA, CORVETTE, IMPALA, LUMINA, VENTURE, MALIBU, MONTE CARLO 1997 OLDSMOBILE ACHIEVA, AURORA, CUTLASS, CUTLASS SUPREME, LSS, REGENCY, EIGHTY EIGHT, SILHOUETTE 1997 PONTIAC BONNEVILLE, FIREBIRD, GRAND AM, GRAND PRIX, SUNFIRE, TRANS SPORT

1997 GMC AND CHEVROLET LIGHT DUTY AND MEDIUM DUTY MODELS 1997 OLDSMOBILE BRAVADA

WITH A HYDRA-MATIC TRANSMISSION/TRANSAXLE 3T40 (RPO MD9), 4T40-E (RPO MN4), 4T60-E (RPO M13), 4T80-E (RPO MH1), 4L60-E (RPO M30), AND 4L80-E (RPO MT1)

THIS BULLETIN UPDATES ALL 1997 MODEL VEHICLES WITH AN AUTOMATIC TRANSMISSION, SECTION 7A, DIAGNOSIS SECTION. THE LAST STEP OF EVERY DIAGNOSTIC TROUBLE CODE (DTC) TABLE HAS THE STATEMENT REQUEST "SPECIFIC DTC" ON THE SCAN TOOL. THE "SPECIFIC DTC" FUNCTION DOES NOT EXIST ON THE SCAN TOOL SOFTWARE AT THIS TIME AND UNTIL A SOFTWARE UPDATE IS ISSUED, THE FOLLOWING PROCEDURE SHOULD BE FOLLOWED WHERE THE TROUBLE TREE HAS THE STATEMENT REQUEST "SPECIFIC DTC":

1. SELECT "DIAGNOSTIC TEST STATUS." 2. SEARCH THE LIST FOR THE DTC IN QUESTION. 3. IF THE DTC HAS NOT RUN, OPERATE THE VEHICLE AS DIRECTED IN THE LAST STEP OF THE DIAGNOSTIC TABLE UNTIL THE DTC RUNS.

IF THE DTC HAS PASSED, IT WILL DROP OFF THE DIAGNOSTIC TEST STATUS LIST.

MAKE A NOTE OF THE ABOVE CHANGES IN YOUR SERVICE MANUAL.

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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.