(4MATIC Electronic Traction System, Function - GF42.35-P-1000AVF)

MODEL 205 with TRANSMISSION 722.961/965 

Function requirements for electronic traction system 4MATIC, general 

• Drive train operational/engine running
• Electronic Stability Program (ESP®) not deactivated

Electronic traction system 4MATIC, general 

The electronic traction system (ETS) is a system which operates automatically for improving the starting off and acceleration ability on different road surfaces. It replaces the automatic locking differential. The system operates by means of brake intervention at spinning wheels. The electronic traction system prevents one-sided spinning of the drive wheels when starting off and accelerating as well as the drive wheels spinning briefly on both sides when cornering within specified speed ranges.

Electronic traction system 4MATIC, function sequence 

Should one or more wheels spin on a smooth surface, the necessary brake pressure is automatically applied at each wheel in order to brake the spinning wheels. Simultaneously, the resulting locking differential effect transfers the drive torque to the wheels that are not spinning. At the same time as the wheel-specific intervention by the brake system, the torque is reduced by the CDI control unit (N3/9) (with diesel engine) or the ME-SFI control unit (N3/10) (with gasoline engine) in order to keep the vehicle in a controllable driving condition. The ESP® warning lamp symbol in the instrument cluster (A1) indicates when a wheel speed no longer matches the vehicle speed. It thus warns the driver that he has approached the physical driving limits with his vehicle.