DELAYED UPSIFT WHEN CRUISE CONTROL IS ENGAGED. Chevrolet Prizm 1998

SUBJECT: DELAYED UPSHIFT WHEN CRUISE CONTROL IS ENGAGED (REPLACE CRUISE CONTROL MODULE)

MODELS: 1998 CHEVROLET PRIZM WITH MS7 (4-SPEED AUTOMATIC TRANSMISSION)

CONDITION:

SOME CUSTOMERS MAY COMMENT ON A DELAYED UPSHIFT WHEN THE CRUISE CONTROL IS ENGAGED. DURING CRUISE CONTROL OPERATION, IF THE TRANSMISSION DOWNSHIFTS TO MAINTAIN THE SELECTED SPEED WHILE CLIMBING A GRADE, IT MAY NOT UPSHIFT IMMEDIATELY WHEN THE GRADE IS CRESTED. THIS CONDITION DOES NOT EXIST WITH THE MXO 3-SPEED AUTOMATIC TRANSMISSION.

CAUSE:

THE CONDITION MAY BE DUE TO THE CRUISE CONTROL MODULE SOFTWARE BEING PROGRAMMED INCORRECTLY, ALLOWING FOR A DELAYED UPSHIFT AFTER CRESTING A GRADE.

CORRECTION:

A NEW CRUISE CONTROL MODULE (P/N 94859069) HAS BEEN RELEASED TO REPLACE THE OLD MODULE (P/N 94857285) FOR USE IN VEHICLES WITH THE MS7 4-SPEED AUTOMATIC TRANSMISSION. THE OLD MODULE MAY CONTINUE TO BE USED TO SERVICE VEHICLES WITH THE 3-SPEED AUTOMATIC OR THE 5-SPEED MANUAL TRANSMISSION. REFER TO THE PROCEDURE SPECIFIED IN THE 1998 PRIZM SERVICE MANUAL FOR REPLACEMENT OF THE CRUISE CONTROL MODULE.

PARTS INFORMATION:

P/N DESCRIPTION ================ ================================

94859069 MODULE, CRUISE CONTROL

PARTS ARE EXPECTED TO BE AVAILABLE FROM GMSPO, 4/15/98.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OPERATION LABOR OPERATION NUMBER TIME ================= =================

R1220 0.3 HR

FIGURES: 00

ATTACHMENTS: 00

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.