ECM - Harsh 1-2 Shift During Light Throttle Acceleration

NO.:
92-T-27

DATE:
June, 1992

GROUP:
Transaxle

CORP. NO.:
287106



SUBJECT:
Harsh 1-2 Upshift During Light Throttle Acceleration (Replace PCM and Download New Calibration)

MODELS
AFFECTED:
1991 SL2 Sedans and SC Coupes equipped with MP7 automatic transaxle

CONDITION:
A harsh 1-2 upshift may be experienced during light throttle accelerations. This condition is most noticeable when the transaxle is at, or above normal operating temperature.

CAUSE:
Under certain driving conditions, the PCM/TC adaptive process may improperly adjust clutch fill times, resulting in a harsh 1-2 upshift, when accelerating from a stop, with a throttle opening between 12 and 20 percent.

CORRECTIVE
ACTION:





Refer to the flow-chart to determine what corrective action should be taken.



PARTS
REQUIREMENTS:
21022155 Powertrain Control Module - Engine Gas, 4-Cyl, 1.9L,
MFI, DOHC (LLO) - Auto. Trans. MP7

CLAIM
INFORMATION:
To receive credit for this repair, submit a claim through the Saturn Dealer System as follows:

Labor
Case Operation
Type Description Code Time

VW Controller, PCM-Replace T9571 0.3 hrs

When returning the PCM, include the following information: "PCM replaced for transaxle service calibration."