Fiat 1996 Brava Service Manual page 397

Engine
Fuel system
Bravo-Brava ^
TD100
10.
HEATER PLUGS PRE/POST HEATING MANAGEMENT
The electronic control unit directly controls the heater plugs control unit managing the pre and post
heating times mainly according to the values for the engine coolant temperature and the intake air tem­
perature.
In order to calculate the post-heating times, the control unit also assesses the accelerator lever position
and rpm values, decreasing these times if there is a high engine power request.
1. Electronic control unit
2. Accelerator lever position sensor
3. Air temperature sensor
4. Rpm sensor
5. Coolant temperature sensor
6. Heater plugs control unit
Instrument injector
The instrument injector informs the electronic control unit of the actual injection advance (start of the
injection stage or of the start of the movement of the needle valve).
According to the signal the control unit cor­
rects the advance set by the injection actua­
tor until the nominal value is reached.
The injector is fitted on the cylinder (1) and is
equipped with a device for recognizing the
exact moment of the start of the injection
stage and with wiring for sending a signal
and informing the electronic control unit.
Inside the injector there is a coil (2), a needle
valve 93) and an adjustment pin (1). The coil
is electrically supplied and produces a mag­
netic flow which affects the needle valve (3).
When the latter initiates the opening of the
nozzle for injecting the fuel, this causes a
variation in the magentic flow in the coil (2)
which the control unit recognizes as the start
of the injection and on which the advance
adjustment strategy is based.
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