ENGINE   275.950 /980 in MODEL 215

MODEL 215, 220 K40/7kL Starter relay (right fuse and relay module) K40/7kN Air pump relay (right fuse and relay module) K40/8kV Motronics relay, circuit 87 (engine fuse and relay box) K40/8SW Charge air relay (engine fuse and relay box) N3/10 ME-SFI control unit
		P07.61-2776-01

Model 215, 220 with engine 275.980 K40/8 Engine fuse and relay box K40/8kV Motronic relay (ME control unit) K40/8SW Charge air relay (charge air cooling circulation pump) K40/8kX Intank fuel pump relay
		P47.20-2192-01

Model 230 F33 Rear prefuse (Fuses 200 A and 60 A screwed on to reverse side) N3/10 ME-SFI [ME] control unit K40/4 Passenger-side fuse and relay module K40/4f43 Fuse 43 (circuit 87 engine 1, connector sleeve Z7/35) K40/4f44 Fuse 44 (circuit 87 engine 2, connector sleeve Z7/36) K40/4kK Motor electronics relay and chassis (plug position K) K40/4kL Starter relay (plug position L) K40/4kM Relay terminal 30z (plug position M) K40/4kO Air pump relay (plug position O)
		P07.61-2880-06

Model 240 B37 Accelerator pedal sensor Fuse 21 (terminal 87 for relay N10/1terminal, terminal 30z for motor electronics control unit) F34 Interior fuse box K6 Starter relay N3/10 ME-SFI [ME] control unit N10/1 Driver-side SAM control unit with fuse and relay module N10/1f43 Fuse 43 (circuit 87 engine 1, ECI ignition system, connector sleeve Z7/35) N10/1f44 Fuse 44 (circuit 87 engine 2, connector sleeve Z7/36) N10/1kl Circuit 87 relay, engine
		P07.61-2766-06

Voltage supply The ME-SFI control unit is supplied with voltage at circuits 87 and 30 as follows (fused/unfused): Model 215, 220 from right front fuse and relay module (K40/7) Model 230 from passenger-side fuse and relay module (K40/4) Model 240 from driver-side SAM control unit with fuse and relay module (N10/1)

Ground connections of output stages Several ground connections and the ground of the electronics are attached near the ME control unit (major assemblies compartment partition, wheelhouse or body). The ME control unit features short-circuit protection as well as reversed polarity protection in the operating voltage section. In certain cases voltage is supplied through several pins connected in parallel by means of bridges to relief the electrical connectors.

If the signal "Circuit 15 fused On" transmitted by the EIS control unit (N73) If "Circuit 15 secured On" is read in by the motor electronics control unit (N3/10), the ground for the main engine relay is shifted through actuation of a transistor. Once the engine main relay has closed the power contact, voltage flows through it from circuit 30 via two fuses as circuit 87 M to the ME control unit and the engine control. For the purpose of assigning consumers/components to the two 20 A fuses, a distinction is made as to which consumers/components of the motor electronics are required or not required for engine operation.

If the ME-SFI control unit receives the signal "circuit 15 fused OFF" from the EIS control unit, the computer run-on time is started. Once this run-on time has elapsed, the engine main relay is switched off and the ME-SFI control unit is thus isolated from the electrical system. Voltage supply: refer to Wiring Diagrams, Group 54.

ME-SFI control unit, location/task/design/function

GF07.61-P-5000M