S07.10-0005-79
Block diagram |
A1/1 | Instrument cluster (KI) control unit | Y62 | Fuel injectors | |
B6/15 | Intake camshaft position sensor | CAN HMI | User interface CAN | |
M3/3 | Fuel pump with fuel feed module | CAN V | Vehicle CAN | |
N3/34 | ME-SFI [ME] control unit | A | Mercedes-Benz | |
N50 | Fuse and relay module control unit (SRM) | B | Nissan | |
N50k8 | Fuel pump relay | C | Default | |
N93 | Central gateway | D | Optional | |
S2 | Ignition lock switch |
Function requirements for fuel supply, general points
Circuit 87M ON (Engine management ON)
Circuit 15 ON (ignition ON)
Fuel supply, general points
The fuel supply supplies filtered fuel out of the fuel tank in adequate amounts under all operating conditions at an adequate pressure to the fuel injectors.
Function sequence for fuel supply
Switching on of the fuel pump with fill level sensor (M3/3) takes 1 second if the fuel pump relay (N50k8) is actuated by the fuse and relay module (SRM) control unit (N50).
Upon actuation, the fuel pump with fill level sensor (M3/3) suctions the fuel and pumps it through the fuel filter to the high-pressure pump.
In order to determine the fuel specified pressure (fuel requirements), the ME-SFI [ME] control unit (N3/34) evaluates the fuel pressure and the load requirement.
Function sequence for safety fuel shutoff
The safety fuel shutoff system is designed to ensure traffic and occupant safety.
The ME-SFI control unit (N3/34) actuates the safety fuel shutoff based on the following signal:
Intake camshaft position sensor (B6/15)Engine speed
The safety fuel shutoff is activated by the ME-SFI control unit (N3/34) under the following condition:
Absence of the engine speed signal
If the signal from the intake camshaft position sensor (B6/15) is missing,the fuel pump is switched off.