A/T - Harsh/Erratic Upshift After Transaxle Repair
NO.: 91-T-06ADATE: November, 1993
GROUP: Transaxle
CORP. NO.: 187104R
SUBJECT:
Harsh/Erratic Upshift After Transaxle Repair (Reset Adaptives After Transaxle Repairs)
MODELS AFFECTED:
1991-1994 Saturns - Automatic Transaxles (MP6/MP7)
PURPOSE:
The transaxle controller (PCM/TC) has the ability to adjust (adapt) the shifting pressures due to build variations, normal transaxle wear, and environmental conditions. In order to prevent possible transaxle damage, or a customer concern, the adaptive parameters must be reset using the Service Stall System, whenever the following repairs are performed:
A. Replacing a transaxle
B. Replacing a line pressure actuator
C. Transaxle overhaul when new clutch plates are installed
D. Replacing a valvebody
The vehicle must also be driven following the "Learn-In Procedure" (page TAAT 18) located in the "Powertrain Control Module-Transaxle Control" section of the March 1991 "Automatic Transaxle Service Manual."
The labor time for resetting adaptive parameters, as well as time for driving the vehicle, is included in the labor operation time for procedures "A" through "D" in this bulletin.