73
Chapter 3
C - OPERATING MODES
1
- Operating phases
Nominal operation: see layouts and correspondence table.
•
DW10TD, EW7J4 and TU5JPL4 engines:
The engine coolant temperature sensor (variable resistor) is connected to
the engine management ECU. This converts the signal from the sensor
into a variable frequency signal and sends it to the BSI. The engine
management ECU also transmits the warning signal to the BSI.
The BSI encodes this information in a VAN frame to be sent to the control
panel.
The coolant temperature gauge illuminates the corresponding temperature
segments.
•
TU5JPL3 engine
The temperature sensor supplies its current directly to the BSI. In AIR
CONDITIONING mode, the temperature warning is given by an engine
coolant temperature management unit.
2
- Specific operating cases
•
Overheating warning
The BSI encodes a sound and a warning message in the VAN frame in
addition to the temperature.
The 6 zones and the warning LED "g" are illuminated, a "warning beep"
type sound is emitted repeatedly and the following message is displayed
"STOP ENGINE TEMPERATURE".
•
Downgraded mode
If the temperature sensor develops a fault, the BSI places a specific
temperature code value in the VAN frame.
In the event of an invalid value, the control panel only illuminates zone
"a".
MULTIPLEXED BSI - XSARA PICASSO AND XSARA – PART 4
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