ME-SFI ignition ON, function - GF07.61-P-3005MS

ENGINES 275.953 in MODEL 216, 221 up to Model Year 08 /modification year 07 

ENGINES 275.982 in MODEL 216, 221 up to Model Year 08 /modification year 07 

Data flow at ignition ON 

Fig 1: Identifying Data Flow At ME-SFI Ignition On

Courtesy of MERCEDES-BENZ USA

The ME-SFI [ME] control unit is the gateway for the drive train CAN and chassis CAN.

Functions in the case of ignition ON: 

• ME-SFI voltage supply for fuel injection and ignition system
• Actuating fuel pump for about 1 second (partially audible) as a full-running protection.

  The engine must be started before the fuel pump is actuated again.

• The engine diagnosis indicator lamp or the CHECK ENGINE indicator lamp in the instrument cluster must light up (lamp check).
• At ignition "ON", data exchange takes place via the CAN databus.
• The throttle valve actuator always checks its return spring after ignition ON and carries out a positioner adaptation in certain conditions.