GF07.61-P-5001KE Voltage Supply of ME-SFI Control Unit, Function

GF07.61-P-5001KE Voltage Supply Of ME-SFI Control Unit, Function
- up to model year 08

Component Identification:

Voltage supply of ME-SFI [ME] control unit
The ME control unit is supplied directly with voltage from the battery (G1) "unfused".

The ME control unit features a short-circuit protection as well as a reversed polarity protection in the operating voltage section.

Engine control voltage supply
If the signal "Tml. 15 fused ON" transmitted by the EIS [EZS] control unit is read in by the ME-SFI [ME] control unit, the engine main relay (relay tml. 87, engine) is actuated with ground at the front SAM control unit with fuse and relay module/driver.
The engine main relay closes its power contact and the voltage from "circuit 30" is transmitted according to the corresponding fuses, such as "circuit. 87 M1.1/M1.2/M2.2" to the ME control unit. When this happens, the engine management system is switched on by "circuit 87 M1.2" and a power output stage driver performs the further actuation of the engine main relay.

Cutting out the engine control
If the ME control unit receives the signal "circuit 15 fused off" from the EIS control unit, the processor run-on of approx. 5 seconds is started. Once the processor run-on is complete, the engine main relay is switched off and engine control is thus isolated from the electrical system.

System tests are conducted by the ME-SFI [ME] control unit during the computer run-on and the fault memory is updated.

Ground connection
Several ground connections for the ME-SFI [ME] control unit, the ignition output stage and the motor electronics are mounted close to the ME-SFI [ME] control unit on the body.

In certain cases voltage is supplied through several pins connected in parallel by means of bridges to relief the electrical connectors.