GF07.61-P-3005MAS ME-SFI Ignition ON, Function

GF07.61-P-3005MAS ME-SFI Ignition ON, Function
- as of model year 09


Function requirements for ignition ON, general points
^ Circuit 15 ON

Ignition ON, general points
For ignition ON, the engine control in the ME-SFI [ME] control (N3/10) is switched on and the engine prepared for starting.

Ignition ON function sequence
When the ignition is switched on, the EIS control unit (N73) connects the on-board voltage from "tml. 30" to "tml. 15" through the terminal 15 relay (N10/1kD). If voltage is present at ME-SFI control unit "tml. 15", engine terminal 87 relay (N10/1kC) is actuated with a ground signal.

This causes the relay to close its power contact and, through the corresponding fuses, the "tml. 30" voltage is connected as "tml. 87 M4" to the ME-SFI control unit and as "tml. 87 M1/2/3" to the respective sensors and actuators of the engine control.
If voltage is present at "tml. 87 M4", the engine control is switched on and an output stage driver in the ME-SFI control unit takes over actuation of the engine terminal 87 relay.

The "tml. 31" ground connection runs from the on-board electrical system battery (G1) through battery ground (W10) and several ground lines to the electronic ground (LH footwell) (W34/1).

Switching on of the ME-SFI [ME] control unit causes the following functions to be executed:
- For complete security, fuel pump () is actuated by fuel pump control unit (N118) M3(only the first time the ignition is switched ON after the vehicle is unlocked).
- For the lamp check, the engine diagnosis indicator lamp (A1e58) on the instrument cluster (A1) is actuated by the ME-SFI control unit over the chassis CAN (CAN E) and central CAN (CAN F).
- Data are exchanged with the EIS control unit (tml. 50 signal and drive authorization) over the chassis CAN.
- The fault memory can be read out and erased via the data link connector (X11/4).
- Correction programming or diagnosis can be carried out with the Diagnosis Assistance System (DAS) over the data link connector.
- The front and rear throttle valve actuators (M16/3, M16/4) check their return springs (through the positions of the throttle valves) and adapt the positions as required.

The following partial functions which are active for ignition ON are described in the following documents:
^ ME fuel supply, function
^ Correction programming, function