Typical engine management system (Mercedes-Benz C-Class W201)

Typical engine management system

Designations on the diagram: 1. Battery; 2. Ignition switch; 6. Fuse box; 17. Overvoltage protection relay; 18. Fuel pump relay; 19. Fuel pump; 20. Ignition control unit; 21. Coolant temperature sensor; 22. Distributor; 23. Spark plugs; 24. Ignition coil; 25. Diagnostic socket; 26. Air flow meter; 27. Fuel injection control unit; 28. Throttle switch; 29. Cold engine start valve; 30. Overspeed switch; 31. Thermovalve with delay; 32. Electrohydraulic actuator; 33. Overspeed protection relay; 34. TDC sensor; 35. Bypass air duct heater

Symbol designations on diagrams, grounding points and fuses are located here →

(Original source of information: www.MercedesMan.ru)

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C-Class 190 (W201) / Electrical circuits

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Radiator motor, magnetic clutch and downshift switch
Engine start and battery charging circuit
Symbol Designations on Schematics, Grounding Points and Fuses

Indicator lights and instruments (typical diagram)
Exterior lighting devices — side lights, rear lights, fog lights and headlights
Exterior lighting (continued) — turn signals, hazard lights, brake lights and tail lights
Standard interior lighting and windshield wiper
Headlight/windscreen washer and cleaner, rear window defroster, heater fan

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