Ignition Off, Function - GF07.10-P-1002MMV

Engine 276.8 in model 205, 253 

Function requirements for ignition OFF, general points 

• Circuit 87 M (engine management ON)
• Terminal 15

Ignition OFF, general points 

With the ignition OFF, first the engine and then the engine management are switched off in the ME-SFI [ME] control unit (N3/10).

Function sequence for ignition OFF 

For ignition OFF, the engine compartment circuit 15 relay (K40/8kG) is switched off by the electronic ignition lock control unit (N73) via the interior CAN (CAN B) and by the front SAM control unit (N10/6). The "circuit 15 OFF" signal is sent redundantly via the chassis FlexRay (Flex E), powertrain control unit (N127) and drive train CAN (CAN C1) to the ME-SFI [ME] control unit.

If the ME-SFI [ME] control unit receives the "circuit 15 OFF" signal over the engine compartment circuit 15 relay, the engine is switched off by shutting off the fuel pump (M3), the fuel injectors (Y76/1 to T1/6) and the ignition coils (T1/1 to Y76/6) are switched off and computer run-on is started.

The "circuit 31" ground connection is made from the on-board electrical system battery (G1) via the battery ground point (W10) and multiple ground lines to the right front ground point (for lamp unit) (W2). When the ignition is OFF, the ME-SFI [ME] control unit is supplied with power from the on-board electrical system battery via "circuit 30 fused".