B - air intake circuit

B - AIR INTAKE CIRCUIT

This consists of the following components:

• A throttle case containing the engine idle speed regulation step motor, throttle valve position potentiometer and inlet air temperature sensor.
• An absolute pressure sensor with vacuum socket connected to the inlet manifold.

1. Engine idle speed regulation actuator (step motor)
2. Throttle valve position potentiometer
3. Intake air temperature sensor
4. Absolute pressure sensor
5. Attachment for throttle case heating fluid inlet pipe
6. Attachment for throttle case heating fluid outlet pipe
7. Attachment for petrol vapour cut-off solenoid pipe (blue bush)
8. Attachment for blow-by oil vapour pipe (brown bush)

C - ELECTRIC/ELECTRONIC CIRCUIT

Connects and provides power to all injection/ignition system components. Consists mainly of an electronic control unit (ECU) and the following parts.

• Dual system supply relay
• Throttle valve position sensor
• Coolant temperature sensor
• Fuel pump submerged in tank
• Four injectors
• Absolute pressure sensor
• Intake air temperature sensor
• Engine idle speed regulation actuator (step motor)
• Rpm and TDC sensor
• Two ignition coils
• Lambda probe
• Fuel vapour control solenoid
• Four spark plugs
• Inertia safety switch
• Diagnostic socket for Fiat/Lancia Tester