Engine Controls - Jolt on 3-2 Coast Downshift

Date: July 28, 2008

Order No.: P-B-27.60/69a

Supersedes: P-B-27.60/69 dated February 23, 2006

Group: 27

Revision History

Revision Date Purpose

a 7/28/08 Procedure Revised

- 2/23/06 Initial issue

SUBJECT:
Model 211.056/256, As of VIN A874921 to A918949
Model 221.171, As of VIN A000355 to A016837

Uncomfortable Downshifting While Coasting

If you receive customer reports in the above model vehicles of uncomfortable downshifting or a noticeable jolt during a 3 -> 2 gear shift while coasting, this may be caused by the engine control module increasing the engine idle speed, which in turn modifies the adaptive behavior of the shift. To resolve, perform engine control module reprogramming using DAS version 05/2008 or higher. If no new software is found in Star Diagnosis, SCN coding should still be performed. After SCN coding is completed, perform quick test and erase any fault codes which may have been generated by the flashing process.

Note:
The adaptation data of the 3 -> 2 shift (B1) may be in the extreme negative range (up to -20 cycles filling time). In rare cases, the 4 -> 3 shift (K3) may also be affected. If this is the case, reset the adaptation values for these shift elements and readapt.

Note:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on July 28, 2008. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowanceent labor time allowance.





In Case of Warranty, use the table.