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

ENGINE 271.948 in MODEL 203.040 /740 with TRANSMISSION 716 with CODE (494) USA version 

Fig 1: Starter Control Function Diagram - Engine 271.948 In Model 203.040 /740 With Transmission 716

The starter control which is integrated in the ME control unit takes over the actuation of the starter and the deactivation of the starter after reaching the engine starting speed.

Starting prerequisites 

Actuation of the starters take place only at "Start Enable" (drive authorization) from the EIS control unit and when the clutch pedal is fully depressed.

starting 

By actuation of the ignition in the start position, the ME control unit receives the "tml. 50 signal" from the EIS control unit via the CAN databus. Start control is carried out automatically by the ME control unit (touch start). It actuates the starter relay with a ground signal. The power contact on the starter relay closes and the starter solenoid switch is supplied at "tml. 50" with voltage from "tml. 15 unfused".

Ending start 

When reaching the engine starting speed of 400 up to 700 rpm and a starting time of approx. 5 to 40 seconds (dependent on the coolant temperature), the ME control unit interrupts the negative activation to the starter relay and therefore ends the starting procedure.

Once the start operation is initiated, switching off "Terminal 50" (ignition/starter switch) no further influence on the starting procedure.