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

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8 

Shown on engine 272.963 in model 171 

Fig 1: Ignition ON Function Diagram

Courtesy of MERCEDES-BENZ USA

Functions in the case of ignition ON: 

• The gasoline, injection and ignition system (in the ME-SFI [ME] control unit) is supplied with a voltage.
• To protect against cylinder flooding, the fuel pump is actuated for approx. 5 seconds (only for first "Ignition ON")
• The engine diagnosis indicator lamp or CHECK ENGINE lights up in the instrument cluster (lamp check).
• Data exchange with the EIS [EZS] control unit (terminal 50 signal and drive authorization system) takes place via the CAN data bus.
• The fault memory can be read out and erased via the data link connector.
• Correction programming or diagnosis can be undertaken using STAR DIAGNOSIS via the data link connector.
• The throttle valve actuator checks its return spring (via the position of the throttle valve) may lead to a positioner adaptation.
• The tumble flap switchover is actuated and a check is performed to ensure that the end positions have been reached.