Starter control, function - GF15.30-P-3000G

ENGINE 111.921 /942 /943 /944 /946 /947 /973 /977 #0 

ENGINE 111.945 in MODEL 208.335 /435 as of 1.6.98, 202.020 /080 as of 1.9.98 

ENGINE 111.974 #0 with CODE (494a) USA version with CODE (807) Model year 1997 with CODE (808) Model year 1998 

ENGINE 111.975 #0 as of 1.8.96 

ENGINE 112.910 /911 /912 /913 /914 /916 /917 /920 /921 /923 #0 

Shown on engine 111, 112 

Fig 1: Starter Control Function Diagram - Shown On Engine 111, 112

Task 

Interrupting the circuit (circuit 50) to the starter solenoid switch after engine start speed is reached (switching off starter).

Design 

The starter solenoid switch is actuated not through the ignition/starter switch, but through the starter relay by the engine control unit. The voltage for the starter relay (coil) is supplied through circuit 87. The starter relay is actuated by the engine control unit through GND.

Function 

When the ignition/start switch is turned from position 2 into the start position, start recognition is activated by the engine control unit through circuit 50. As soon as an engine start speed of 400 to 700 rpm is reached, the engine control unit interrupts the ground actuation to the starter relay and thus the start operation.

with manual transmission 

The starter control is only enabled when the clutch pedal is operated. When the clutch pedal is depressed, the clutch pedal switch is operated for start enable (S40/5).