Citroën Picasso Xsara Technical Training Multiplexed BSI Manual

165
Chapter 2
IV -   DOWNGRADED MODES
Faults in  the components below  lead to a  system operation which,  depending on
the case:
•
•
bypasses the faulty component,
prevents certain functions.
An ECU  considers there  to  be a  fault when  the value  transmitted by  one of  the
components is outside fixed  limits. These values are set  for normal vehicle usage,
plus a certain margin.
FAULT ORIGIN
BEHAVIOUR ADOPTED
Evaporator temperature sensor.
External temperature sensor.
Compressor prevented from engaging.
The compressor  cut-off  only depends  on
the    evaporator    temperature,    with    a
suitable limit.
Air conditioning pressure sensor.
Coolant temperature information.
Compressor prevented from engaging.
Compressor prevented from engaging.
MULTIPLEXED BSI - XSARA PICASSO AND XSARA – PART 8
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