Scania fault code 778
Code 778 is used by 9 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Steering wheel switch for cruise control, CAN messages missing
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COO Coordinator
Distance sensor
CAN communication with the distance sensor (DIS) is interrupted.
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MBS
Sensor for rear left-hand luggage hatch, open circuit
The voltage supply to the control unit input for the left-hand luggage hatch sensor is 12 V. This indicates an open circuit.
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DDU
TCO control unit, no CAN communication
The DDU control unit is not receiving CAN messages from the TCO control unit.
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ICL Instrument Cluster
Communication with the tachograph (TCO)
No CAN messages from the tachograph.
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CMS
Fuel theft alarm
The logic in the control units (CMS and ALM) is interpreting the fuel theft alarm as having been tampered with.
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DAS
Distance sensor
CAN communication with the distance sensor (DIS) is interrupted.
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COMMUNICATOR Communicator (C200 / C300 / C400)
Communication with the visibility system (VIS)
The RTC control unit has not received any CAN messages from the VIS control unit within the time expected.
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DCU
Long activation of sensing strip, rear door leaf, active
The door control unit detects a permanent activation (CN3-9) of the sensing strip which lasts more than 20 seconds.
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