Starter control function

P15.30-0208-76

CAN Controller area network (CAN databus)

K40/4 Fuse and relay module

K40/4k2 Starter relay (integrated in fuse and relay module)

L5/6 Crankshaft position sensor

M1 Starter, circuit 50

N3/7 IFI [ERE] control module (engine 605, 606)

N3/8 DFI [EVE] control module (engine 602, 604)

N73 Electronic ignition switch control module

0 The key can only be removed when in position "0".

1 Most electrically powered equipment can be switched on

2 Preglow and drive position

3 Start position

Task

 To switch off the starter (M1) when the engine is running on its own power

Function

The starter (M1) is actuated by the IFI [ERE] control module (N3/7) or DFI [EVE] control (N3/8) via the fuse and relay module (K40/4) and the starter relay (K40/4k2).

The values for engine self-running recognition, starter protection and ring gear protection are stored in the control module in the form of characteristic curves or fixed values.

Conditions for starter ON:

 Drive authorization system unblocked

and  engine speed = 0

and  key in start position

Conditions for starter OFF:

 Key not in start position (starting interrupted)

or  Engine has started

or  maximum allowable engine speed exceeded once (starter protection)

In the case of a repeat start, a blocking time of 1.5 seconds must elapse after switching off the starter in order to prevent the starter meshing in the starter ring gear of the engine when the starter pinion is rotating (ring gear protection).

Fault safety features:

In the case of an engine start without start signal (circuit 50 not switched), caused by incorrect mechanisms, fuel injection is not enabled in order to prevent the engine from starting.

Exception: Fuel injection is also enabled in the absence of a start signal from a vehicle speed of  2.4 km/h in order to enable the vehicle to be push-started.