CVT - No Reverse Or No Reverse Unless RPM's Raised

37 No reverse or no reverse unless RPMs are raised

38 12 09

2029320/2

June 26, 2012.

Supersedes Technical Service Bulletin Group 38 number 12 - 08 dated April 24, 2012 for reasons listed below.





Affected Vehicles





Condition
Customer mat report no reverse -OR- no reverse unless RPMs are raised. No faults stored in the TCM.

Technical Background
An input assembly securing ring that is too thin could allow play in the input shaft. This play causes a lack of pressure build up and will not allow reverse to engage. RPM increase may build up enough pressure and reverse may engage harshly.

Production Solution
Correct thickness input shaft securing ring installed as of 12/2010.

Service

1. Remove transmission and follow the procedure for removing the input shaft assembly in ELSA: Transmission >> Continuously Variable Transmission Internal Components >> 38 Gears, Hydraulic Controls >> Removal and Installation >> Input shaft.





Note:
Replace the axial sealing element PN 0AW 301 547A as shown in the instructions while the input shaft is removed. This is the seal that can cause pressure loss for reverse!

2. Reassemble while following all instructions. Disregard the step that states "Check wear on transmission components" as there should be no need to disassemble the input shaft. Be sure to use the thickest possible securing ring that will fully insert into the groove from the set of securing rings PN 0AW 398 321.

3. Reinstall transmission into vehicle. Refill transmission and verify repair.





Warranty





Required Parts and Tools

Additional Information
All parts and service references provided in this TSB are subject to change and/or removal. Always check with your Parts Department and service manuals for the latest information.