A/T - 722.9, Delayed Reverse Engagement
DELAYED ENGAGEMENT OF REVERSE GEARTopic Number LI27.00-P-047119
Version 1
Design Group 27.00 General
Date 06/24/2009
Validity Transmission 722.9 with code 809
Reason for change Additional procedure for remedy
Reason for block
Complaint:
When reverse is selected, the engagement sequence may be delayed.
A double jolt may occur at an interval of approx. 3 seconds after moving the gearshift lever from P to R.
The complaint occurs with electrohydraulic controller (EHS) 220 270 2406 and 220 270 2306.
These electrohydraulic controllers are installed in transmissions as of model year 2009 (code 809).
Cause:
Parameterization of adaptation values for clutch pack BR (reverse gear)
Remedy:
1. Perform software update in transmission control unit and then perform SCN coding.
It is absolutely essential to make sure that DAS version 01/09 or higher including add-on 1077 is used.
2. Then the reverse gear adaptation data must be reset using DAS (menu guide in attachment).
3. The engagement sequences for N-D and N-R must be taught in again:
NOTE:
Always remain in the gear ranges N/R/D for at least 5 sec!
Start the engine from cold,
shift 5 times N-R,
shift 5 times N-R --> warm up transmission 40°C and while doing so, exceed a speed of 50 km/h at least once.
shift 5 times N-R,
shift 5 times N-D --> warm up transmission to 70°C and while doing so, exceed a speed of 50 km/h at least once.
shift 5 times N-R,
shift 5 times N-D.
Attachment
Symptoms
Validity
NOTE:
The following allowable labor operations should be used when submitting a warranty claim for this repair. This information has been generated on June 24, 2009. Please refer to Netstar --> Star TekInfo --> Star Time for the most current labor time allowance.
In case of Warranty, use the table above.