Fiat 1996 Brava Service Manual page 396

Bravo-Brava ^
TD100
Engine
Fuel system
10.
EXHAUST GAS RECIRCULATION MANAGEMENT
The electronic control unit calculates the weight ratio between the "clean" intake air and the quantity of
burnt gases which can be returned to the intake. Depending on the engine load, the temperature of the
coolant, the atmospheric pressure and the quantity of intake air, the electronic control unit operates the
Borg Warner solenoid valve which, in turn, activates the EG R valve, by means of a vacuum signal, there­
by allowing the partial recirculation of the exhaust gases.
AIR CONDITIONING SYSTEM MANAGEMENT
When the air conditioning is switched on, the compressor absorbs power from the engine which, when
idling, tends to cut out. In order to prevent this problem, the control unit activates the fast idle function
described previously.
Another function carried out by the control unit is that of interrupting the compressor supply if one of
the following conditions occurs:
1. Coolant temperature more than 110 °C;
2. Exceeding of a certain rpm level (around 4500);
3. High engine power request (strong acceleration).
In conditions 1 and 2 the supply is restored when the coolant temperature or engine rpm values go be­
low the intervention level.
In condition 3 the interruption is only momentary and the supply is automatically restored after several
seconds even in the high power request still exists.
P4A17EJ02
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1X-96 - Cancels and replaces
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