Heater Plugs Control Unit; Accelerator Pedal Potentiometer - Fiat Bravo Service Manual

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Table of Contents

H E A T E R P L U G S C O N T R O L U N I T

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 w h i c h 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

2. Connected to earth

3. Injection control unit (pin 3 - 3 8 )

4. Injection control unit (pin 3 - 5 1 )

5. Injection control unit (pin 2 - 1 )

8. Battery positive ( + 3 0 )

G. Heater plugs (only 4 outlets are used)

A C C E L E R A T O R P E D A L P O T E N T I O M E T E R

The position of the accelerator pedal is trans-

formed into an electrical voltage signal and is

sent to the injection control unit by the poten-

tiometer connected to the pedal.

The accelerator pedal position signal is pro-

cessed together w i t h the information relating to

the speed to obtain the injection times and pres-

The sensor is made up of a casing (1) fixed to

the pedals by a flange, w h i c h contains a shaft

( 2 ) , in an axial position, connected to the t w o

potentiometers ( 3 ) : one main one and one safe-

There is a coil spring on the shaft w h i c h ensures

the correct resistance to the pressure, whilst a

second spring ensures the return on release.