Heater Plugs Control Unit - Fiat 1998 Marea Service Manual

Marea-Marea
99 range
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4F015NJ02
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HEATER PLUGS CONTROL UNIT

The operation of the heater plugs takes place
via the heater plugs control unit under the di-
rect control of the injection control unit.
There is an intelligent relay inside the heater
plugs control unit which sends a feeback sig-
nal to the injection control unit which is
therefore informed of any failure in the heater
plugs control unit or a short circuit to earth for
the heater plugs.
The diagram shows 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 (pins 3-38)
4. Injection control unit (pins 3-51)
5. Injection control unit (pins 2-1)
6. 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
sent to the injection control unit by the poten-
tiomter connected to the pedal.
The accelerator pedal position signal is proc-
essed together with information concerning the
engine speed to obtain the injection time and
pressure.
The sensor consists of a casing (1), fixed to
the pedals assembly by a flange, which con-
tains a shaft (2), in an axial position, con-
nected to the two potentiometers (3): one
main one and one safety one.
A coil spring on the shaft ensures the correct
resistance to pressure, whilst a second spring
ensures the return on release.
Engine
Fuel system
10.
15