Typical engine management system
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Designations on the diagram: 1. Battery; 2. Ignition switch; 6. Fuse block; 17. Surge 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 start valve; 30. Overspeed switch; 31. Thermal valve with delay; 32. Electro-hydraulic actuator; 33. The relay is protected from overspeed; 34. TDC sensor; 35. Air bypass heater
Symbol designations on the diagrams, grounding points and fuses are located here →