Starting System: Description and Operation

Starter Control

Model 170:

After engine start speed is reached, the start control interrupts the power flow (circuit 50) to the solenoid switch of the starter (starter shutoff).

The solenoid switch of the starter is actuated not through the ignition/starter switch, but through the starter relay by the engine control module.

The voltage for the starter relay (coil) is supplied through circuit 87. The starter relay is actuated by the engine control module through ground.

Start recognition by the engine control module is effected through circuit 50 by simultaneously operating the clutch pedal and the ignition/starter switch from position 2 into start position. When an engine speed of 400 to 700 rpm is reached, the engine control module interrupts the ground actuation to the starter relay and thus the start operation.

Start recognition function
- through circuit 50

Starter relay
- Model 170: in cycle module (N65k2)

Electronic ignition switch (EIS) control module position/task/design/function
- (models with DAS 3)

Clutch pedal switch position/task/function
- (USA)