Honda automatic transmission selector position sensor
The automatic transmission shift position sensor in Honda vehicles is an electrical component that detects the position of the gearshift lever and transmits this information to the transmission control module (TCM).
Working principle:
The sensor consists of two main components:
* Position switch: The switch has several contacts corresponding to different positions of the automatic transmission selector.
*Wiring Diagram: The electrical circuit connects the position switch to the TCM.
When the gear shift lever is moved to a certain position, the corresponding contact on the position switch closes or opens. This change in the electrical circuit is detected by the TCM, which then determines the position of the gear selector.
Functions:
The automatic transmission selector position sensor performs several important functions:
* Unwanted Gear Shift Prevention: The TCM uses selector position information to prevent unwanted gear shifts, such as shifting into reverse while driving forward.
* Engine Control: Gear selector position affects engine performance such as idle speed and downshift deceleration.
* Starter Interlock: On some Honda models, the automatic transmission selector position sensor prevents the engine from starting if the selector is not in the ‘Park’ or ‘Neutral’ position.
Sensor types:
Honda cars use several types of automatic transmission selector position sensors:
* Mechanical: This is a traditional type of sensor using physical contacts and switches.
* Electronic: This type of sensor uses electronic components such as position sensors and a magnetic clutch to detect the position of the gear selector.
Location:
The automatic transmission selector position sensor is usually located behind or under the gear shift lever. It can be connected to the gear selector by a mechanical cable or an electronic connection.
Malfunctions:
Malfunctions of the automatic transmission selector position sensor can lead to problems with shifting gears, starting the engine and other problems related to the operation of the transmission. Common faults include:
* Broken or damaged wire
* Closing or breaking contacts
* Electronic circuit malfunction
If you have problems with gear shifting or engine operation, you should check the automatic transmission selector position sensor.