Hitachi system wiring diagram key

Hitachi system wiring diagram key

1. Engine control unit
2. F/L Tester (line K)
3. Engine timing sensor
4. Lambda sensor
5. Air flow meter
6. Ignition coils
7. Ignition power module
8. Butterfly position sensor
9. Coolant temperature sensor
10. Detonation sensor
11. Engine rpm sensor
12. Control unit casing earth on vehicle bodyshell
13. Vehicle speed inlet
14. Intake from three stage pressure switch (climate control if fitted)
15. Calibration selection
16. Trim level selection (to earth for versions without climate control)
17. Connection with Fiat CODE control unit
18. Operation of electric fan low speed relay

19. Operation of electric fan high speed relay (short circuited at pin 9 for versions without climate control)
20. Intake for request to engage climate control compressor (if fitted)
21. Operation of rev counter
22. Climate control compressor relay feed (if fitted)
23. Operation of system failure light
24. Engine idle speed adjustment sol. valve
25. Injectors
26. Charcoal filter solenoid valve
27. Inertia switch
28. Electric fuel pump
29. Electric fuel pump relay
30. System relay feed
31. AVV signal from ignition key (+50)
32. Supply from battery (+30)
33. Supply from ignition key (+15)
34. Pump fuse (30 A)
35. System fuse (15 A)
36. Earth (on engine block)
37. Earth (under cylinder head cover)

SYSTEM RELAYS

With the ignition key in the ON position (+15) the energizing coils for both relays are supplied, which close the respective power contacts.

Relay (A) supplies the electric fuel pump, receiving voltage directly from the battery.

Relay (B) ensures the multiple supply of the control unit and the various system sensors and actuators, both directly and via the connectors.

NOTE The layout of relays (A) and (B) and fuses (7) and (8) can vary through production requirements. They should be recognized on the basis of the electrical connections.

1. Electric fuel pump
2. Injectors
3. Charcoal filter solenoid valve
4. Ignition power module
5. Air flow meter
6. Butterfly position sensor
7. Fuse
8. Fuse
9. A. Electric fuel pump relay
10. B. System relay feed