Gearbox adaption — AUDI

Gearbox adaption
One of the essentials for optimum and consistent gear shifting, apart from favourable design parameters, is the accurate control of the selector elements. In order to keep the gear shift quality at a consistently high level throughout the service life of the gearbox, it is necessary to continuously adapt various open and closed-loop control parameters and to store the calculated adaption values. This process of adaptation or learning is referred to as adaption.
The objective of gearbox adaption is to compensate for variations in gearbox components during manufacture (i.e. tolerances) and throughout their service life. The adaption values take the form of offsets which can be added to or subtracted from the applied values permanently stored in the gearbox control unit.
When should the adaption values be read / assessed / deleted and when should an adaption drive be performed?
Customer complains that gear shifts are rough
After an ATF change
After repairs to the clutches
After renewing the valve body
After renewing the
automatic gearbox control unit
J217
After renewing the gearbox
After a software update
After certain repairs to the engine, e.g. after renewing the air mass meter.
It is important to follow closely all the instructions, work procedures and conditions in the
“Guided Functions”
.
With vehicle diagnostic tester connected, select
Guided Functions
,
02 - Gearbox electronics 09D I J217
and run function
J217 - Gearbox control unit, adaption drive (Rep. Gr. 38)
.
Note
After deleting the adaption values, an adaption drive must be performed using the "Guided Functions" or "Guided Fault Finding". If the adaption drive is not possible, for whatever reason, an extensive road test must be performed. Try to maintain the adaption conditions as closely as possible.
General adaption conditions
An adaption can be performed only if the defined adaption conditions have been met.
The criteria below apply during the adaption:
The ATF temperature must be within a defined range.
Defined gear or gear shift.
The engine load must be within a defined range. A very low engine load or a light throttle application is usually required.
No fault memory entries in the gearbox control unit.
A particular driving condition must prevail (e.g. throttle applied or overrun mode, constant driving mode, vehicle stopped with engine idling, etc.).
Good road conditions, best possible road surface, no steep uphill or downhill gradients, flat stretch of road.