Notes on 6-speed automatic gearbox 0BQ — AUDI

Audi
Audi Q7
2007
Power transmission
Automatic gearbox 0BQ, four-wheel drive
Edition
12.2008
Notes on 6-speed automatic gearbox 0BQ
Design and function of gearbox
Detailed information on the 6-speed automatic gearbox 0BQ can be found in
Self-study programmes 283, 284 and 385
. You also have the opportunity of attending an expert training course (EX337) on the 6-speed automatic gearbox.
For general information on the function and design of automatic gearboxes, please refer to the exercise CDs
Multimedia Training; Power Transmission Parts 1 to 3
.
Gearbox
The 6-speed automatic gearbox 0BQ, four-wheel drive, has six hydraulically actuated forward gears. When the lock-up clutch is closed these forward gears become mechanically driven gears by cutting out the torque converter slip.
Torque converter
The torque converter is equipped with a lock-up clutch allowing controlled slip.
Mechatronic unit
The mechatronic unit incorporates the following components as a complete synchronised unit:
Hydraulic control system,
automatic gearbox control unit
J217
Multifunction switch
F125
Sensors and actuators
The mechatronic unit is installed in the gearbox within the oil pan.
Automatic gearbox control unit
J217
The control unit is part of the mechatronic unit in the gearbox.
The gear change points are calculated automatically (depending on the driving situation and the resistance to motion).
Advantages:
Controlled gearshifts for enhanced fuel economy
Maximum engine output is always available
Individual adaptation of gear change points in all driving situations
Gear change points are infinitely variable
Self-diagnosis
Before performing repairs to the automatic gearbox, determine the cause of the fault as precisely as possible using
“Guided Fault Finding”
.
To perform
“Guided Fault Finding”
, use
Vehicle diagnosis, testing and information system VAS 5051
.
Variation of gear-change points for gradients
An additional gear change map automatically selects gear changes for gradients depending on accelerator pedal position and driving speed.
Gear change map for extreme uphill gradients is matched to engine output
Gear change map for extreme downhill gradients is matched to the braking effect of the engine
Increased engine braking effect can also be obtained by directly selecting a specific gear via the tiptronic function, e.g. when towing a trailer on downhill gradients