Mitsubishi Galant automatic transmission control unit
The automatic transmission control unit (also known as the automatic transmission ECU) is an electronic device responsible for controlling the operation of an automatic transmission. In the Mitsubishi Galant, the location and type of automatic transmission control unit may vary depending on the year of manufacture and model.
Location
Typically, the automatic transmission control unit is installed:
* Near the gearbox, in the engine compartment
* Inside the car, under the dashboard or near the center console
Type
Mitsubishi Galant can be equipped with different types of automatic transmission control units, for example:
* Traditional automatic transmission control unit: Controls the operation of the automatic transmission using hydraulic and mechanical components.
* Electronic automatic transmission control unit (AT ECU): Controls the operation of the automatic transmission using electronic sensors and actuators.
* Combined automatic transmission control unit: Combines the features of traditional automatic transmission control units and automatic transmission ECU.
Functions
The main functions of the automatic transmission control unit are:
* Monitor engine speed, vehicle speed and throttle position
* Gear shift depending on driving conditions
* Ensure smooth gear shifting
* Torque converter lock-up control
* Adaptation to driver’s driving style
Diagnostics
Malfunctions of the automatic transmission control unit can manifest themselves in the form of:
* Hard gear changes
* Gear slipping
*No gear shift
* The ‘Check Engine’ or ‘Service Engine Soon’ light comes on
To diagnose the automatic transmission control unit, you can use a fault code scanner (OBDII) or specialized equipment for working with the transmission.
Replacement
The automatic transmission control unit should be replaced at a specialized car service center. This is a complex procedure that requires special knowledge and equipment.