INTERMITTENT OR NO TCC APPLY (REPL. TRANSAXLE WIRE HARNESS). Buick Regal 1993

REVISION 10/27/93

THIS BULLETIN IS BEING REVISED TO CHANGE MODEL YEARS UNDER MODELS SECTION. ---------------------------------------------------------------------- SUBJECT: INTERMITTENT OR NO TCC APPLY -- POSSIBLE DTC CODE 26 AND/OR DTC CODE 39 (REPLACE TRANSAXLE WIRE HARNESS)

MODELS: 1991-93 CHEVROLET LUMINA 1992-93 CHEVROLET LUMINA APV 1991-93 PONTIAC BONNEVILLE, GRAND PRIX 1992-93 PONTIAC TRANS SPORT 1991-93 OLDSMOBILE NINETY EIGHT, EIGHTY EIGHT, CUTLASS SUPREME 1992-93 OLDSMOBILE SILHOUETTE 1991-92 OLDSMOBILE TORONADO 1991-93 BUICK PARK AVENUE, RIVIERA, LESABRE, REGAL 1991-93 CADILLAC FLEETWOOD, DEVILLE, SIXTY SPECIAL, ELDORADO, SEVILLE

TRANSAXLE APPLICATIONS:

1991-93 HYDRA-MATIC 4T60-E (RP0 M13)

CONDITION: (FIGURE 1)

SOME OWNERS MAY EXPERIENCE AN INTERMITTENT OR NO TCC APPLY CONDITION. A SES LIGHT WITH DTC 26 AND/OR DTC CODE 39 MAY BE PRESENT.

CAUSE: (FIGURE 2)

THE CONDITION MAY BE CAUSED BY A SHORT IN THE INTERNAL WIRING HARNESS OF THE TRANSAXLE. IT WAS DETERMINED THE DIODE WIRE SPLICE (IN THE WIRING HARNESS) MAY HAVE THE ABILITY TO POKE INTO THE INSULATION OF THE ADJACENT WIRE CAUSING A SHORT.

CORRECTION:

TO TEST FOR THE ABOVE CONDITION, DISCONNECT THE TRANSAXLE WIRING HARNESS AT THE TCC SOLENOID. AT THE TRANSAXLE ELECTRICAL CONNECTOR, PLACE ONE PROBE OF THE DVOM AT PIN "A", AND THE OTHER PROBE AT PIN "D". WHILE MONITORING THE DVOM, MANIPULATE THE WIRE HARNESS AT THE DIODE LOCATION. IF CONTINUITY IS PRESENT AT ANY TIME, THE TRANSAXLE WIRE HARNESS MUST BE REPLACED.

SERVICE PART INFORMATION:

THE FOLLOWING PART NUMBERS ARE FOR 4T60-E TRANSAXLES BETWEEN MODEL YEAR 1991-1993.

PART NUMBER DESCRIPTION MODELS 12109436 HARNESS ASSEMBLY WIRING 2ABW, 2ANW, 2AWW, 2CLW 2CSW, 2CTW, 2CXW, 2CZW 3ABW, 3ANW, 3AWW, 3CLW 3CSW, 3CTW, 3CXW, 3CZW

12121130 HARNESS ASSEMBLY WIRING 1AHW, 1AMW, 1APW, 1AVW 1AZW, 1YMW, 1YPW, 1YZW 1BTW, 2AMW, 2APW, 2AVW 2AYW, 2AZW, 2BTW, 2BYW 2PHW, 2WAW, 2YLW, 2YMW 2YZW, 3AMW, 3APW, 3AVW 3AZW, 3BTW, 3BYW, 3PHW 3WAW, 3YLW, 3YMW, 3YRW 3YZW

12121131 HARNESS ASSEMBLY WIRING 1CWW, 2CWW, 3CWW, 3CMW

12143000 HARNESS ASSEMBLY WIRING 3BHW

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

LABOR OPERATION: K6554 USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 2

Object Number: 86169 Size: SF

Object Number: 86168 Size: FS

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.