Automatic transmission control unit (AT) for Toyota Ipsum ACM21
Original spare part numbers:
* U140E-08A
* U140E-08C
Compatibility:
* Toyota Ipsum ACM21 with U140E automatic transmission
Manufacturers:
*Aisin
* Jatco
Functions of the automatic transmission control unit:
The automatic transmission control unit is the brain of the automatic transmission, which controls the following functions:
* Gear selection
* Gear shift timing
* Fluid pressure in automatic transmission
* Torque converter lock
* Protection against overheating and switching to emergency mode
Symptoms of a faulty automatic transmission control unit:
* Jerks, jolts or slipping when changing gears
*Won’t shift into certain gears
*Stuck in one gear
* Switch to emergency mode
Replacing the automatic transmission control unit:
Replacing the automatic transmission control unit is a complex procedure that must be performed by a qualified mechanic. This usually requires:
* Draining fluid from automatic transmission
* Removing the old automatic transmission control unit
* Installation of a new automatic transmission control unit
* Filling new fluid into the automatic transmission
* Reset fault codes
Recommended:
* Use the original automatic transmission control unit or a unit from a trusted manufacturer.
* Contact a qualified car service to replace it.
* Regularly service the automatic transmission (change fluid and filter) to prevent problems with the automatic transmission control unit.