- Harsh engagement when changing gear range from P to D -






















Topic number



GI27.50-P-044018



Version



3



Design group



27.50 Gear assembly



Date



03-11-2010



Validity



Transmission 722.9 up to sequence number 1.842.410



Reason for change



Additional possible remedy




Complaint


When changing gear range from P to D, harsh engagement may be noticeable.



Cause


Friction coefficient fluctuations possible in the B2 disk packs in vehicles with transmission sequence numbers smaller than 1.842.410.



Remedy


Applies only for transmissions with sequence number less than 1.842.410: Replacement of B2 disks. Order parts as per EPC.


Otherwise the engagement sequences for N-D and N-R must be taught in again as follows:


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-D --> warm up transmission to 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.



Symptoms
















Symptom



Power transmission / Power transmission, function / Jolting/shuddering during start-off



Power transmission / Automatic transmission / Automatic transmission - function / General



Power transmission / Automatic transmission / Automatic transmission - function / Shuddering during start-off



Power transmission / Automatic transmission / Automatic transmission - function / Shudders



Power transmission / Automatic transmission / Automatic transmission - function / Poor shift quality


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