GF07.10-P-1000MAW Ignition ON Function

GF07.10-P-1000MAW Ignition ON Function

Function requirements for ignition ON, general points
^ Circuit 30

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 electronic ignition lock control unit (N73) switches on relay terminal 15 (N10/1kJ) via chassis CAN (CAN E). The circuit 15 relay leads the on-board voltage from "circuit 30" to "circuit 15".
If voltage is present on ME-SFI [ME] control unit "circuit 15", engine circuit 87 relay (N10/1kN) is actuated with a ground signal.

To do this the relay closes its power contact and the voltage is led from "circuit 30", according to the respective fuses, as "circuit 87 M1" to the ME-SFI [ME] control unit and as "circuit 87 M2/3/4" to the respective sensors and actors of the engine control.
If a voltage is applied to "circuit 87 M1", the engine control switches on and an output stage driver in the ME-SFI [ME] control unit takes on further actuation of the terminal relay 87 for the engine.

The ground connection "circuit 31" takes place from the on-board electrical system battery (G1) via the ground point battery at the front right (W10) and a number of ground lines to the ground point electronics assemblies compartment on the left (W16/5).

When the engine control is switched on, the ME-SFI [ME] control unit carries out the following functions:
- Model 204: For ensuring complete filling, LH and RH fuel pump control units (N118/3, N118/4) actuate LH and RH fuel pumps (M3/2, M3) (only the first time the ignition is switched ON after the vehicle is unlocked).
Model 212: For ensuring complete filling, fuel pump (N118) is actuated by the fuel pump control unit (M3) (only the first time the ignition is switched ON after the vehicle is unlocked).
- In the instrument cluster (A1) the engine diagnosis indicator lamp (A1e58) is actuated via the chassis CAN (CAN E) for a lamp check.
- Data are exchanged with the electronic ignition lock control unit (circuit 50 signal and drive authorization) over the chassis CAN.
- 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 fault memory in the ME-SFI [ME] control unit can be read out and deleted via the chassis CAN, the diagnostic CAN (CAN D) and the diagnostic connector (X11/4).
- Correction programming or diagnosis can be carried out with the Xentry diagnostics through the diagnostic connector.

Different performance maps for the engine control can be stored and activated with the correction programming in the ME-SFI [ME] control unit, such as.
- Ignition maps for adaptation to different fuel grades ( research octane number correction) (except code (494) USA version)
- Mixture maps for enrichment of the fuel/air mixture in different operating conditions (except code (494) USA version)
- Basic setting for idle speed
- Idle speed for engaged gear range
- Fault setting conditions for smooth running detection
- Temperature correction for switching on/off the combustion engine fan motor and air conditioning system with integrated control (M4/7)