The most important interfaces of the ABS/ASC control unit are those for the choke, digital engine electronics (DME), adaptive transmission control (AGS) and for the alternator:
The ABS/ASC control unit reduces or increases the torque at the drive axle by closing or opening the choke accordingly. This intervention is the first but relatively slow measure in reducing the drive torque during ASC control.
The ABS/ASC control unit can implement the following engine interventions by way of the digital engine electronics:
Intervention |
Effect |
|---|---|
Ignition timing set towards "retard" |
Fast yet smooth reduction of drive torque |
Blanking out ignition/injection pulses |
Fast reduction of drive torque |
Increase in idle speed |
Reduction in engine drag torque on vehicles with manual transmission |
Vehicles equipped with an adaptive transmission control (AGS) can receive a signal from the ABS/ASC control unit during an ASC control phase, i.e. mainly on road surfaces with snow and ice, to the effect that imminent gearshifts, resulting in an increase in the torque in the drive axle are suppressed.
The alternator signal terminal 61 is a redundant signal and serves the purpose of detecting whether the engine is running. At an alternator voltage below 8 V, the ASC subsystem switches off and the multi-function lamp lights up. However, no fault is stored in the defect code memory.