E 320 Sedan (210.065) V6-3.2L (112.941) (1999)
Function of ignition ON and engine running
With ignition ON the fuse and relay module (K40/4) and the engine control module are actuated. Relay K2 switches the battery voltage through fuse 3 to
the engine control module. The voltage for the remaining components which form part of the IFI, DFI or CDI fuel injection system, is supplied through
fuse 2.
Function of ignition OFF
With ignition OFF actuation is cancelled, but voltage continues to be supplied for about a further 4 seconds through contact B1.3 to the fuse and relay
module (K40/4) by means of the holding relay circuit in the engine control module. The engine control module detects the voltage drop at circuit 15 and
initiates engine stop.
Engine stop function:
DFI: by deenergizing the shutoff valve (Y23/2y1)
IFI: by deenergizing the fuel metering actuator (Y23/1)
CDI: by energizing the shutoff valve (Y75)