Electronic control unit for automatic transmission (Automatic transmission ECU) Mercedes-Benz W140
Location:
* Usually located behind the glove compartment, on the driver’s side.
Functions:
* Controls all aspects of automatic transmission operation, including:
* Gear shift
* Torque converter locking torque
*Torque transmission
* Idle speed
* Vehicle speed
Automatic transmission ECU models:
Various automatic transmission ECU models are available for the Mercedes-Benz W140:
* 722.3 – 4-speed automatic transmission, installed on models before 1995.
* 722.5 – 5-speed automatic transmission, installed on models from 1995 to 1999.
Part Number:
The automatic transmission ECU part number depends on the model and year of manufacture. Some common part numbers:
* A 037 545 04 32 (722.3)
* A 140 270 11 01 (722.5)
Common problems:
Automatic transmission ECUs can fail over time, causing the following problems:
* Slipping or slipping of gears
*Hard gear shifts
* Transmission overheating
*Unable to switch gears
Repair:
Automatic transmission ECU repair usually includes replacing damaged components or reprogramming the control unit.
Adviсe:
* Check the automatic transmission fluid level and filter condition on a regular basis.
* Avoid aggressive driving, which can cause increased wear on the transmission.
* If you experience any problems with the automatic transmission, contact a qualified mechanic as soon as possible.