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

MODEL 218 with TRANSMISSION 722.966/967 

Function requirements - 4MATIC electronic traction system, general 

• Circuit 61 (engine running)
• Electronic Stability Program (ESP®) not deactivated

4MATIC electronic traction system, general 

The electronic traction system is a system which operates automatically for improving start-off and acceleration characteristics on different road surfaces. It replaces the automatic locking differential (ASD).

The system operates via brake system interventions at the driven wheels. No engine control cycle is activated. 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.

Function sequence - 4MATIC electronic traction system 

Should one or more wheels spin on a smooth surface, the required brake pressure is automatically built up 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.

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