Exhaust Gas Recirculation Management; Air Coditioning System Management - Fiat Bravo Service Manual

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E X H A U S T G A S R E C I R C U L A T I O N M A N A G E M E N T

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 S Y S T E M M A N A G E M E N T

When the air conditioning is switched o n , the compressor absorbs power from the engine w h i c h , w h e n

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.

I X - ' l f i - C a n c e l s a n i l r- p U c .

Electronic control unit

Accelerator pedal position sensor

Coolant temperature sensor

Borg Warner solenoid valve

Atmospheric pressure sensor

1. Electronic control unit

2. Coolant temperature sensor

3. Air conditioning control switch

4. Rpm sensor

5. Compressor relay feed

6. Air conditioning compressor