Fiat 1996 Brava Service Manual page 264

Bravo-Brava^iev Engine
98 range Fuel system
10.
MANAGEMENT OF THE CLIMATE CONTROL SYSTEM
The injection/ignition control unit is connected to the climate control system, because:
1. it receives the request to switch on the compressor and operate the appropriate interventions (addi­
tional air);
2. it gives the go ahead to switch on the compressor when the conditions required by the strategies have
been verified;
3. it receives information on the state of the four stage pressure switch and operates the appropriate in­
terventions (operation of the radiator fan).
As far as point 1 is concerned, if the engine is idling, the control unit increases the air flow rate, altering
the position of the butterfly in advance of the engagement of the compressor and conversely it returns
the butterfly to its normal position after the compressor is switched off.
The engine idle speed is also increased the entire time the compressor is activated (engine warm: 900
[rpm].
As far as point 2 is concerned, the control unit automatically operates the disengagement of the com­
pressor:
- for several seconds (timed disengagement):
- in conditions where the engine power requirements are high (strong acceleration);
- during vehicle take-off;
- as long as the following critical conditions persist:
- temperature of the engine coolant above a certain level (engine overheating);
- engine speed below 700 rpm.
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