Key To Wiring Diagram; Rpm And Phonic Wheel Sensor - Fiat Bravo Service Manual

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Table of Contents

Key to wiring diagram

1. Heater plugs warning light

2. Rev counter signal

3. Air conditioner relay

4. Air conditioner activation button

5. Fiat/Lancia Tester fault diagnosis point

6. Injector with controls

7. Rpm and TDC sensor

8. Coolant temperature sensor

9. Accelerator lever position sensor

10. Intake air temperature sensor

The rpm sensor is fitted on the crankcase and faces a phonic wheel located inside the crankcase and fas-

tened to the crankshaft.

The steel phonic wheel is fitted w i t h t w o reference dowels on the outer part of the circumferenc, each

one located 10° after top dead centre.

When these dowels or teeth pass beneath the sensor, the gap brings about a change in the magnetic flux

which in turn induces a current in the sensor coil windings.

This signal provides the control unit w i t h information on engine rpm.

1 1 . Injection system failure warning light

12. Debimeter

13. Preheating control unit

14. System relay

15. Borg Warner solenoid (E.G.R)

17. Ignition switch

18. Fast idle valve

19. Solenoid for advance adjustment device