SMU - SEC. 7A-5A AND 7A-5B - SHIFT SPEED CHART REVISED. Buick Century 1994

SUBJECT: SERVICE MANUAL UPDATE - SECTION 7A-5A AND 7A-5B - SHIFT SPEED CHART, ELECTRICAL DIAGNOSIS CHARTS AND OTHER INFORMATION REVISED

MODELS: 1994 BUICK CENTURY, PARK AVENUE, LE SABRE, SKYLARK AND REGAL 1994 CADILLAC DE VILLE 1994 CHEVROLET BERETTA, CORSICA, LUMINA AND LUMINA APV 1994 OLDSMOBILE CUTLASS CIERA, NINETY EIGHT, EIGHTY EIGHT, ACHIEVA, CUTLASS SUPREME, AND SILHOUETTE 1994 PONTIAC BONNEVILLE, GRAND AM, GRAND PRIX AND TRANS SPORT

TRANSAXLE APPLICATIONS: HYDRA-MATIC 4T60-E (RPO M13)

TRANSAXLE MODELS: ALL 1994 MODELS

+--------------------------------------------------------------------+ | SERVICE MANUAL UPDATE | +--------------------------------------------------------------------+

THIS BULLETIN UPDATES THE 1994 SECTION 7A-5A AUTOMATIC TRANSAXLE DIAGNOSIS AND 7A-5B AUTOMATIC TRANSAXLE UNIT REPAIR. THE FOLLOWING 29 PAGES REPLACE THE ORIGINAL PAGES IN YOUR 1994 SERVICE MANUALS. THE CHANGES ARE AS FOLLOWS:

+-------------------------------------------------------------------+ | PAGE | REVISION DESCRIPTION | |---------------------------+---------------------------------------| | 7A-5A-10 | UPDATED SHIFT SPEED INFORMATION | | 7A-5A-11 | UPDATED LINE PRESSURE CHECK PROCEDURE | | 7A-5A-13, 15-19 AND 24-29 | REVISED ELECTRICAL DIAGNOSIS CHARTS | | 7A-5A-30 | UPDATED PCM INPUTS | | 7A-5A-31 | UPDATED PCM DIAGNOSTIC TROUBLE CODES | | 7A-5A-32 AND 33 | NEW ELECTRICAL COMPONENT DESCRIPTIONS | | 7A-5A-34, 35 AND 36 | REVISED ELECTRICAL WIRING DIAGRAMS | | 7A-5B-12, 51 AND 77 | REVISED CHANNEL PLATE COMPONENTS | | 7A-5B-63 | REVISED WIRING HARNESS CONNECTIONS | | 7A-5B-64 | REVISED SIDE COVER PAN USAGE | | 7A-5B-67, 80 AND 81 | REVISED 1-2 ACCUMULATOR USAGE | +-------------------------------------------------------------------+

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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 OCCURRING 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 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.