Hitachi System Wiring Diagram Key; System Relays - Fiat 1998 Marea Service Manual

Marea- Marea Weekend
99 update

Hitachi system wiring diagram key

1. Anti-inversion diode
2. Single coils
3. Engine timing sensor
4. Detonation sensor
5. Injectors
6. Charcoal filter solenoid valve
7. Engine coolant temperature sensor
8. Air flow meter
9. Butterfly position sensor
10. Idle speed adjustment actuator
11. Engine rpm sensor
12. Engine management control unit
13. Line K
14. Memory reprogramming
15. FIAT CODE control unit connection
16. Vehicle speed intake
17. Rev counter operation
18. Interface connector
19. System failure light control
20. Intake from climate control three stage
thermosta (if fitted)
21. Trim level selection (only connected to
earth for versions without climae control)
22. Lambda probe
23. Electric fuel pump
24. Inertia switch

SYSTEM RELAYS

With the ignition key in the ON position ( + 15), the energizing coils for both relays are supplied and the
power contacts are closed.
The relay (A) supplies the fuel pump, receiving voltage directly from the battery.
The relay (B) ensures the multiple supply of the control unit and the various system sensors and actuators
both directly and through the connector blocks.
NOTE The arrangement of the relays (A) and (B) and the fuses (1) and (2) can vary according to pro-
duction requirements. The recognition depends on the electrical connections.
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25. High speed fan relay feed (if fitted)
26. Low speed fan relay feed
27. Fuel pump relay
28. I.E. relay
29. Supply ( + 15) for FIAT CODE
30. Supply (+30) for FIAT CODE
31. Climate control compressor relay feed (if
fitted)
32. Climate control compressor engagement
intake (if fitted)
33. Engine coolant temperature gauge signal
34. Engine earth for FIAT CODE
35. Fuse A (30 A)
36. Fuse B (50 A)
37. Fuse C (15 A)
38. Fuse D (10 A)
39. Fuse E (7.5 A)
40. Fuse F (7.5 A)
41. Ignition switch
42. Engine earth
43. Battery
44. Intake from climate control 4 stage thermo-
stat (if fitted)
A. Fuel pump relay
B. System relay
1. 10A fuse
2. 15A fuse
3. Anti-inversion diode
Engine
Fuel system
10.
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