Fiat 1996 Brava Service Manual page 364

Bravo-Brava ty™
98 range
P4A15KJ01
P4A16KJ02
Engine
Fuel system
10.
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)
8. Battery positive (+30)
G. Heater plugs (only 4 outlets are used)
ACCELERATOR PEDAL POTENTIOMETER
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 with the information relating to
the speed to obtain the injection times and pres­
sure.
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 safe­
ty 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.
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