ESP, function: ASR:

The traction control function (ASR) requires an exchange of signals between ABS control module (w/EDL) -J104-, the engine control module and the transmission control module (automatics only), in other words a communication link between the control modules.

These signals are transmitted via CAN-BUS  .

The ASR traction control system prevents the driven wheels from spinning under acceleration: the system operates by reducing engine torque and is active at all speeds. The EDL and ASR functions act together to assist acceleration.