Automatic transmission selector lever position sensor
Purpose:
The automatic transmission selector lever position sensor (automatic transmission) is designed to determine the position of the gear selector lever and transmit this information to the automatic transmission electronic control unit (ECU).
Design and operating principle:
The sensor is usually an electronic device located on the automatic transmission housing. It consists of:
* Potentiometer or Hall sensor, which measures the position of the selector lever.
* Electrical contacts for transmitting information to the automatic transmission ECU.
When you move the selector lever, a potentiometer or Hall sensor creates an electrical signal proportional to the position of the lever. This signal is then transmitted to the automatic transmission ECU via electrical contacts.
Functions:
The automatic transmission selector lever position sensor performs the following functions:
* Determines the current position of the selector lever (park, neutral, reverse, drive, etc.).
* Provides information to the automatic transmission ECU for selecting the appropriate gear and operating mode of the automatic transmission.
* Prevents engine starting if the selector lever is not in neutral or park position.
* Provides auxiliary functions such as reverse gear and reverse gear lighting.
Malfunctions:
Malfunctions of the automatic transmission selector lever position sensor can lead to the following problems:
* Inability to select the desired gear.
* Difficult or incorrect gear shifting.
* Engine start blocking.
* Errors or warnings on the dashboard.
To diagnose sensor faults, a fault code scanner is usually used. Common fault codes associated with the shift lever position sensor include:
* P0705 – Malfunction of the automatic transmission selector lever position sensor
* P0706 – Open circuit of the automatic transmission selector lever position sensor
* P0707 – Short circuit of the automatic transmission selector lever position sensor