Transmission Controls - AW55-50 Harsh 3-2 Downshift

NO: 43-36

DATE: 1-07-2005

MODEL/YEAR:
MY 2001-2004 S/V 40

SUBJECT:
S/V 40; Harsh 3-2 Downshift, 2-3 Upshift flare

This TNN supersedes the previous 43-36, dated 1-28-2003. Please update your files.

The tool for reloading 2001-2004 S/V 40 TCM's will not function with VADIS 2004 F edition and later.

DESCRIPTION:

S/V 40 cars equipped with the AW55-50 automatic transmission may exhibit an intermittent harsh 3-2 downshift. This symptom may be described as a bang or thump in the car while slowing down.

These cars may also exhibit 2-3 upshift flare. This shift flare could be described by the customer as the transmission slipping, the car feeling like it was in neutral for a short time, the tachometer needle jumping up or the engine racing during a shift.

Also, the SW in the new Transmission Control Module (TCM) adds the Control Module Adaptation function to the car. The 'Arrow' light is used to indicate a 'perfect shift'. A perfect shift is one where the TCM has reached its adaptation target for that particular shift.

SERVICE:





If a customer complains of one or more of the above symptoms, replace the TCM with the part number shown.

These TCM's are pre-loaded with SW and do not need to be loaded with VADIS. Perform CONTROL MODULE ADAPTATION according to the procedure in VADIS.





Warranty Information