© Scania CV 2009 27
Limp home mode
If there is a fault on the normal accelerator pedal or if CAN communication is
interrupted, the following limp-home option is provided:
CAN outage or accelerator pedal malfunction (both signal and idling switch):
- The accelerator pedal value is 0% and the engine is running at normal
idling speed.
- The accelerator pedal value is 0% and the engine is running at raised
idling speed (750 rpm) if this function is activated.
Accelerator pedal malfunction but the idling switch is working:
- The accelerator pedal value can be increased slowly between 0% and
50% by using the idling switch.
CAN outage:
- The engine is switched off if the shutdown function is activated.
Coolant temperature
Normal coolant temperature when the engine is running should be 70-90°C.
The S6 control system has the following alarm levels:
- If the temperature is high, 98°C-103°C, for a certain period (1 second),
S6 will send a CAN message which switches on the warning lamp and
diagnostics lamp via the coordinator.
- If the temperature exceeds 103°C, the warning lamp and diagnostics
lamps will come on. If torque reduction is activated, the control system
will reduce the fuel quantity to 70%. A fault code is generated in the
control unit.
- At temperatures exceeding 103°C and with engine shutdown activated,
the warning lamp and diagnostics lamp come on and the engine is
switched off. If the override function is activated, only torque reduction
takes place when this function is activated. A fault code is generated in
the control unit.
After an alarm, approved values should be registered for more than 2 seconds
to reset the alarm.
Excessively high coolant temperature can damage the engine.
If run for extended periods under an extremely light load, the engine may
have difficulty in maintaining normal operating temperature. However, the
temperature will rise to a normal level again when the load on the engine is
increased.
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