Wiring diagram key

Wiring diagram key

1. Heater plugs warning light
2. Rev counter signal
3. Climate control relay
4. Climate control on button
5. Fiat/Lancia Tester diagnostic socket
6. Instrument injector
7. Rpm and TDC sensor
8. Coolant temperature sensor
9. Fuel introduction lever position sensor
10. Intake air temperature sensor
11. Injection system failure warning light
12. Flow meter
13. Pre-heating control unit
14. System relay feed
15. Fuel vapour solenoid valve
16. Battery
17. Ignition switch
18. Fast idle valve
19. Advance adjustment device solenoid

Engine rpm sensor and flywheel

Features:

Gap
0,8 ÷ 1,5 mm

Winding resistance
860 ohm ± 10% at 20°C

1. Rpm sensor
2. Flywheel

The engine rpm sensor is fitted on the crankcase and is facing a flywheel, located inside the crankcase and fixed to the crankshaft.

The flywheel has 2 reference dowels at 180° from one another, on the outer part of the circumference.

When these dowels or teeth pass under the sensor, as a result of the variation of the gap, this causes a variation in the magnetic flow which produces a current in the coil windings in the sensor.
This signal, sent to the control unit, allows the engine speed to be detected.