GM Service Manual Online
For 1990-2009 cars

Harsh Engagement into Reverse

Subject:Harsh Engagement into Reverse (New PCM Calibration)

Models:1992 SL2 Sedans and SC Coupes equipped with MP7 automatic transaxles and vehicle identification number (VIN Z113023 and below.



Condition

A harsh engagement is experienced immediately after shifting into reverse (R).

Cause

The harsh engagement into reverse may be caused by a PCM calibration error. This condition has been corrected on vehicles built after VIN NZ113023

Normally the Saturn automatic transaxle will have a 1-3 second delay before engaging into reverse. If a customer comments on a harsh shift into reverse, with a quick clutch engagement (usually less than one second), then a new calibration may need to be downloaded into the PCM.

Correction

If a harsh/quick engagement is verified, download #2548 PROD TC CALIBRATION using Saturn Service Stall System and the "How To Use SSS EEPROM Reprogramming" procedures in the "SSS User Guide".

Claim Information

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

Case Type

Description

Labor Operation Code

Time

VW

EEPROM Reprogramming

T9509

0.2 hrs