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

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


Function requirements for ignition ON, general points
^ C. 30 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 relay circuit 15 (K40/2kB) is actuated by the EIS (EZS) control unit (N73) and passed on to the on-board voltage from "circuit 30" to "circuit 15". If voltage is present at "circuit 15" of the ME-SFI [ME] control unit, the motor electronics and chassis relay (K40/4kK) is actuated with a ground signal.

This causes the relay to close its power contact and, depending on the corresponding electrical fuses, voltage is connected from "circuit 30" as "circuit 87 M1" to the control unit ME and as "circuit 87 M1/2" to the corresponding sensors and actuators of the engine control.
If a voltage is present at "circuit 87 M1", the engine control is switched on and an output stage driver in the ME-SFI [ME] control unit takes over the subsequent actuation of the motor electronics and chassis relay.

The "circuit 31" ground connection takes place from the on-board electrical system battery (G1) via the battery ground (W10) and a number of ground lines to the electronic ground (footwell on the left) (W34/1).

When the engine control is switched on, the ME-SFI [ME] control unit carries out the following functions:
- For complete security, fuel pump (M3) is actuated by the fuel pump control unit (N118)(only the first time the ignition is switched ON after the vehicle is unlocked).
- For the lamp check on the instrument cluster (A1), the engine diagnosis indicator lamp (A1e58) (or with code (494) USA version the CHECK ENGINE indicator lamp (A1e26)) is actuated by the ME-SFI [ME] control unit over the engine compartment CAN (CAN C).
- Data are exchanged with the EIS control unit (circuit 50 signal and drive authorization) over the engine compartment CAN.
- The fault memory in the ME-SFI [ME] control unit can be read out and deleted through 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 throttle valve actuator (M16/6) checks its return spring (via the position of the throttle valve) and may lead to a positioner adaptation.

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