CITROEN XSARA Technical Training Manual page 94

C - OPERATING MODES
1 - Operating phases
• When the ignition is switched on.
The control panel compares the last fuel level displayed with the level
indicated by the fuel sender (variable resistor fitted with a float).
In the event of a significant difference, the gross level information is
displayed otherwise the last fuel level displayed is given.
• When driving.
The fuel sender is no longer used.
The engine management ECU supplies the fuel flow information to the
BSI.
The BSI calculates the vehicle's fuel consumption and encodes this
information in a VAN frame.
The control panel takes this consumption information into account in order
to calculate the fuel level. Finally, it transmits this level to the BSI via the
VAN.
2 - Specific operating cases
• Low fuel warning
From a certain sender value, the control panel transmits the low fuel
information to the BSI via the VAN in addition to the fuel level with the aim
of warning the engine management ECU.
In addition, it displays the warning message "WARNING LOW FUEL". LED
V17 is illuminated.
Note:
MULTIPLEXED BSI - XSARA PICASSO AND XSARA – PART 4
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The fuel capacity can be programmed depending on the vehicle
engine (petrol or diesel).
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Chapter 3