Brakes and Traction Control: Description and Operation

GF42.35-P-1000AV 4MATIC Electronic Traction System, Function
MODEL 204.0 with TRANSMISSION 722.960 /962 /963 /964 /965 as of Model Year 2009 /modification year 08
MODEL 204.2 with TRANSMISSION 722.962 /965 as of Model Year 2009 /modification year 08
MODEL 204.9 with TRANSMISSION 722.960 /962 /964 /965
MODEL 212 with TRANSMISSION 722.960 /961 /962
MODEL 216 with TRANSMISSION 722.961 as of Model Year 2009 /modification year 08
MODEL 221 with TRANSMISSION 722.960 /961 /962 as of Model Year 2009 /modification year 08

Function requirements of electronic traction system (ETS) 4MATIC, general
^ Circuit 61 (engine running)
^ Electronic Stability Program (ESP) not deactivated

Electronic traction system (ETS) 4MATIC, general
The ETS is a system which operated automatically to improve the starting off and acceleration ability on different road surface condition. It replaces the automatic locking differential (ASD). The system operates via an intervention by the brakes at the driven wheels. No engine control cycle is activated. 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 - 4MATIC electronic traction system
Should one or more wheels spin on a smooth base the necessary 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 ESP warning lamp or Electronic Stability Program (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.