Automatic transmission control unit (AT) in Subaru Forester
The automatic transmission control unit in the Subaru Forester is an electronic module that controls the operation of the automatic transmission. It is responsible for gear shifting, torque converter locking and other automatic transmission functions.
Location of the automatic transmission control unit
The automatic transmission control unit is usually located in the engine compartment of the Subaru Forester, next to the automatic transmission. It can be mounted on the automatic transmission housing or on a bracket next to it.
Functions of the automatic transmission control unit
The automatic transmission control unit performs the following functions:
* Gear shift control: The automatic transmission control unit receives signals from various sensors, such as the vehicle speed sensor, gear selector position sensor and engine speed sensor. These signals are used to determine the optimal gear shift point.
* Torque converter lockup: The automatic transmission control unit also controls the torque converter lockup. A torque converter is a device that transfers energy from the engine to the automatic transmission. Locking the torque converter improves transmission efficiency by reducing slip losses.
* Emergency mode: If the automatic transmission control unit detects a malfunction, it can put the automatic transmission into emergency mode. In emergency mode, the automatic transmission will operate in a fixed gear, preventing further damage to the transmission.
Possible malfunctions of the automatic transmission control unit
Some of the most common automatic transmission control unit faults include:
* Incorrect gear shifting: The automatic transmission control unit may not shift gears correctly, resulting in sudden jerks or slipping.
* Failure to lock up the torque converter: The automatic transmission control unit may fail and fail to lock up the torque converter, resulting in reduced transmission efficiency and increased fuel consumption.
* Enabling emergency mode: If the automatic transmission control unit detects a malfunction, it can activate emergency mode, limiting the functionality of the automatic transmission.
Diagnostics and repair of automatic transmission control unit
Diagnosis and repair of the automatic transmission control unit must be performed by a qualified mechanic. A mechanic can use a diagnostic scanner to read trouble codes from the automatic transmission control unit. These codes can help determine the source of the problem.
Depending on the malfunction, the automatic transmission control unit may need to be replaced or repaired. Replacing an automatic transmission control module is an expensive repair, so it is important to conduct proper diagnostics before replacing the module.