Audi automatic transmission selector position sensor
Target:
Determine the position of the automatic transmission gear selector and transmit information to the electronic transmission control unit (TCM).
Location:
Typically the sensor is located on or near the gear selector mechanism.
Design:
* May be mechanical, electrical or electronic.
*Mechanical sensors use levers or gears to mechanically sense the position of the selector lever.
* Electrical and electronic sensors use position sensors or switches to convert mechanical positions into electrical signals.
Signals:
The sensor produces different electrical signals corresponding to the different selector lever positions:
*Parking (P)
* Neutral (N)
* Drive (D)
* Reverse (R)
* Other modes (depending on the car model)
Functions:
* Provides information about the position of the TCM selector lever.
* Prevents engine starting if the selector lever is not in position P or N.
* Controls gear shifting in automatic transmission.
* Disables cruise control when switching the selector from D or R modes.
Malfunctions:
Possible malfunctions of the automatic transmission selector position sensor include:
* Incorrect signals leading to incorrect gear shifting or engine starting problems.
* An open circuit resulting in a constant display of a certain selector position.
* Inaccurate readings leading to problems with vehicle handling.
Repair:
A faulty automatic transmission selector position sensor usually requires replacement. Repairs can be performed by a qualified mechanic.