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.

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