Automatic transmission reverse sensor
The automatic transmission reverse sensor is an electrical component that signals the transmission control system that the vehicle is in reverse gear.
Function
* When reverse gear is engaged, the sensor sends an electrical signal to the Transmission Control Module (TCM).
* The TCM then activates the appropriate solenoids, which shift the transmission into reverse.
* The sensor can also be used to turn on the reversing lights.
Design
The reverse sensor is usually a small electromechanical switch. It is usually installed on the gear selector or in close proximity to it.
Operating principle
When the gear selector is moved into reverse, a mechanical switch in the sensor closes, allowing an electrical signal to pass through it. This short activates the circuit and sends a signal to the TCM.
Location
The location of the automatic transmission reverse sensor depends on the specific car model. Usually it is located:
* On the gear selector
* Near the gear selector, on the transmission control shaft housing
* On the transmission itself
Problems
Common reverse sensor problems include:
*Faulty switch: The switch may fail and stop sending a signal.
* Faulty connection: Sensor connections may become loose or damaged, resulting in signal interruption.
*Cable Damage: The cable connecting the sensor to the TCM may be damaged, causing signal loss.
Consequences of a malfunction
A faulty reverse sensor can cause the following problems:
* Difficulty engaging reverse: The transmission may not shift into reverse or may be delayed.
*Disable Reversing Lights: Reversing lights may not turn on when reverse gear is engaged.
* Trouble Codes: The TCM may set a trouble code indicating a problem with the reverse sensor.