CHUGGLE OR TCC GROWL ON GRADES WITH TCC ENGAGED. Pontiac Grand Am 1993

SUBJECT: CHUGGLE OR TCC GROWL ON GRADES WHILE MAINTAINING SPEED WITH TCC ENGAGED (REPLACE EPROM)

MODELS: 1993 BUICK SKYLARK 1993 OLDSMOBILE ACHIEVA 1993 PONTIAC GRAND AM WITH 2.3L ENGINE (VIN 3 - RPO L40) AND 3T40 TRANSAXLE (MD9)

CONDITION:

SOME CUSTOMERS MAY COMMENT ABOUT A CHUGGLE OR TCC GROWL WHILE MAINTAINING A STEADY SPEED ON GRADES OR INCLINES. THIS WILL USUALLY OCCUR AROUND 40 - 45 MPH.

CAUSE:

SOFTWARE CALIBRATION ALLOWING TCC TO APPLY AT 43 MPH.

CORRECTION:

IF NO CAUSE IS FOUND FOR THE ABOVE CONDITIONS AFTER FOLLOWING CURRENTLY PUBLISHED DIAGNOSTICS, REPLACE THE EPROM USING THE PART NUMBER LISTED BELOW. THE TCC CALIBRATION HAS BEEN REVISED TO INCREASE TCC APPLY SPEED TO 49 MPH TO CORRECT THIS CONDITION.

SERVICE INFORMATION:

PERFORM DIAGNOSTICS PER SECTION 6E IN THE SERVICE MANUAL. MAKE ANY ADJUSTMENTS THAT ARE REQUIRED, OR REPLACE ANY INOPERATIVE PARTS.

IF NO CAUSE IS FOUND FOR THE CHUGGLE OR GROWL FOLLOWING CURRENTLY PUBLISHED DIAGNOSTICS, REPLACE THE EPROM USING THE PART NUMBERS LISTED BELOW.

REFER TO THE APPLICABLE SERVICE MANUAL FOR THE EPROM REPLACEMENT PROCEDURE.

PART INFORMATION:

EPROM PART SCANNER BROADCAST NUMBER EMISSIONS I.D. CODE ---------- --------- ------- --------- 16210136 CALIFORNIA 0143 BMSB 16210130 FEDERAL 0133 BMSA

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY USE: LABOR OPERATION: J6364 USE PUBLISHED LABOR OPERATION TIME.

FIGURES: 0 ATTACHMENTS: 0

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.