Heater plugs control unit

HEATER PLUGS CONTROL UNIT

The operation of the heater plugs takes place through the heater plugs control unit under the direct control of the injection control unit. There is an "intelligent" relay inside the heater plugs control unit which sends feed-back to the injection control unit which is thereby informed of any failure in the heater plugs control unit or a short circuit to earth of the heater plugs. The diagram illustrates the connectors at the base of the heater plugs control unit and the pin-out:

1. Earth
2. Connected to earth
3. Injection control unit (pin 3-38)
4. Injection control unit (pin 3-51)
5. Injection control unit (pin 2-1)
6. Battery positive (+30)
7. G. Heater plugs (only 4 outlets are used)

ACCELERATOR PEDAL POTENTIOMETER

The position of the accelerator pedal is transformed into an electrical voltage signal and is sent to the injection control unit by the potentiometer connected to the pedal. The accelerator pedal position signal is processed together with the information relating to the speed to obtain the injection times and pressure. The sensor is made up of a casing (1) fixed to the pedals by a flange, which contains a shaft (2), in an axial position, connected to the two potentiometers (3): one main one and one safety one. There is a coil spring on the shaft which ensures the correct resistance to the pressure, whilst a second spring ensures the return on release.