GF07.10-P-1002MAW Ignition OFF Function

GF07.10-P-1002MAW Ignition OFF Function

Function requirements ignition OFF, general points
^ Circuit 87M ON (engine control ON)
^ Circuit 15 ON

Ignition OFF, general points
For ignition OFF, first the engine and then the engine control is switched off in the ME-SFI [ME] control unit (N3/10).

Function sequence for ignition OFF
When the ignition is switched off, the electronic ignition lock control unit (N73) switches off relay terminal 15 (N10/1kJ) via chassis CAN (CAN E).
If the ME-SFI control unit receives the signal "C. 15 OFF" via relay terminal 15, the engine is switched off by switching off the left and right fuel pumps (M3/2, M3) (on model 204) or the fuel pump (M3) (on model 212), the injection valves (Y62) and the ignition coils (T1) and the computer shutoff delay is started.

Computer power-down is determined by the ME-SFI [ME] control unit and lasts about 4 s. It can, however, last for some minutes due to various functions (such as OBD, Drive Authorization System, thermal management).
When computer power-down is complete, the engine circuit 87 relay (N10/1kN) is switched off and the engine control is disconnected from the on-board electrical system (switched off).

System tests are conducted by the ME-SFI [ME] control unit during the computer power-down and the fault memory is updated.

The ground connection "circuit 31" takes place from the on-board electrical system battery (G1) via the ground point battery at the front right (W10) and a number of ground lines to the ground point electronics assemblies compartment on the left (W16/5).
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".