Selector lever E313
The selector lever sensor system and the control system for the selector lever lock solenoid are integrated into the
selector lever.
The selector lever positions are detected by Hall sensors, which are integrated into the selector lever sensor system.
The selector lever position signals and the Tiptronic signals are transmitted via the CAN bus to the mechatronic unit
and to the control unit in the dash panel insert.
Signal use
Based on the signals, the control unit detects the
selector lever positions. It uses the signals to
implement the driver's D-R-S or Tiptronic command
lk
and to control starter release.
Effects of signal failure
If the control unit detects no selector lever position,
both clutches are opened.
Hall sensors for
Tiptronic position
Tiptronic switches in steering to shift
up and down E438 and E439
S390_052
The switches are located on the right and left on the
steering wheel. The gears can be shifted up and down
by actuating the switches. The shift signals are
transmitted from the steering column electronics
control unit J527 to the mechatronic unit for direct
shift gearbox J743 via the CAN bus.
Hall senders for detecting the
selector lever position
E439
E438
Signal use
In Tiptronic mode, the gears can also be shifted
up and down using the steering wheel switches.
If the Tiptronic switches on the steering wheel are
actuated in automatic mode, the gearbox control
system switches to Tiptronic mode.
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Tiptronic shifting strategy
If the Tiptronic switches on the steering wheel are
no longer actuated, the gearbox control system
automatically switches back to automatic mode
following the expiry of a timer.
- Automatic upshifting on reaching the maximum
engine speed
- Automatic downshifting on falling below the
minimum engine speed
Effects of signal failure
- Kick-down downshifting
In the event of signal failure, no Tiptronic functions are
possible via the steering wheel switches.
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