4MATIC electronic traction system, function - GF42.35-P-1000AVE

MODEL 207 with TRANSMISSION 722.9 with CODE M005 (4MATIC) 

Function requirements for electronic traction system 4MATIC, general 

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

Electronic traction system 4MATIC, general 

The electronic traction system is a system which operates automatically for improving the starting off and acceleration ability under different road surface conditions. It replaces the automatic locking differential (ASD).

The system operates via an intervention by the brakes at the driven wheels. The ETS 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.

Function sequence for electronic traction system 4MATIC 

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 due to the locking differential effect the drive torque is shifted to the wheels which are not spinning.

At the same time as the wheel-specific intervention by the brake system, the torque is reduced by the ME-SFI control unit (N3/10) in order to bring the vehicle to a controllable driving condition.

The Electronic Stability Program warning lamp (A1e41) signals in the IC (A1) when a wheel speed no longer agrees with the vehicle speed. It thus warns the driver that he has approached the physical driving limits with his vehicle.