Fiat 1996 Brava Service Manual page 209

Bravo-Brava ty
TO
Engine
Fuel system
Coolant
temperature
Air temperature
Rpm
Air conditioner
ECU
-
Solenoid
fast
idle
10.
FAST IDLE MANAGEMENT
The control unit activates the fast idle when
at least one of the following conditions oc­
curs:
1. Intake air temperature less than 25° C and
coolant temperature less than 55° C.
2. Air conditioner compressor on.
3. Engine speed less than 750 rpm.
Coolant
temperature
Accelerator lever
position
Rpm
Intake air
quantity
ECU
l A t m o s p h e r - ■
i ic ■
i pressure ■
—
Borg
Warner
Solenoid
EXHAUST GAS RECIRCULATION CON­
TROL
The control unit calculates the weight ratio
between "clean" air taken in and the quantity
of burnt gases which may be returned to the
intake. On the basis of engine load, coolant
temperature and intake air quantity, the con­
trol unit controls the Borg Warner modulator
valve which in turn activates the EGR valve
via a vacuum signal in order to recirculate the
exhaust gas.
Rpm
Coolant
temperature
Air temperature
Accelerator lever
position
Hfc»
Battery voltage _ _ _
ECU
-
Glow plug
preheating
control
unit
GLOW PLUG PRE/POST HEATING MAN­
AGEMENT
The electronic control unit (ECU) controls
the glow plug preheating control unit directly
to manage pre and post heating times, mainly
on the basis of coolant and intake air temper­
ature. When calculating post-heating times,
the control unit also takes into account accel­
erator lever positin and rpm. Heating times
are reduced when there is a high demand for
engine power.
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