Engine Drag Torque Control (MSR)

OPERATION
In the same way as Automatic Stability Control or Slip Control (ASC+T), Engine Drag Control (MSR) is integrated in the Anti-Lock Brake (ABS) control unit. The engine is influenced via Digital Engine Electronic (DME) and the Idle Valve (ZWD 5).

When the Slip Control Module detects excessive wheel slip due to engine braking (drag torque), it signals the DME which now opens the idle valve (ZWD5) slightly to reduce engine drag torque. Further engine drag torque reduction is also obtained by the DME control module advancing the ignition timing and canceling the deceleration fuel cut-off function.