Fiat 1996 Brava Service Manual page 576

Bravo-Brava
98 range
Auxiliary units
Climate control
50.
Case A : the engine management control unit (1) receives the signal to engage the compressor (a) di­
rectly from the control switch (2): the same signal also arrives as a go ahead (b) after having passed
through the climate control control unit (3) and the four stage pressure switch (4): if the pressure is in
the refrigeration circuit is not correct, this signal is, in effect, interrupted. Lastly, if other particular exclu­
sion conditions exist (e.g. maximum power request, idling, etc.), then the control unit (1) sends the
command (c) to engage the compressor (6) via the relay (5).
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1242 -1581 -1998 -1910 J T D Engines
1. Injection control unit
2. Climate control controls
3. Climate control control unit
4. Four stage pressure switch
5. Compressor relay
6. Compressor
Case B: the signal (a) to engage the compressor is sent, from the control switch (2), via the climate con­
trol control unit (3), the four stage pressure switch (4) and the thermal swrtch (7), to the compressor
engagement relay (5). If the conditions for disengaging the compressor (6) exist, (for example maxi­
mum power request, idle speed, etc.), then a signal (b) is sent by the EGR control unit (1) to a remote
control switch (8) and the compressor is switched off.
P4A05CH02
191OTD 75 engine (Soft)
1. EGR control unit
2. Climate control controls
3. Climate control control unit
4. Four stage pressure switch
5. Compressor relay
6. Compressor
7. Thermostatic switch on water pump
8. Remote control switch for disengaging
compressor
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