Scania fault code 784
Code 784 is used by 7 different Scania systems. Choose the control unit shown in your diagnostic tool:
BMU Battery Management Unit
Coolant pump (M83) for cooling system, incorrect behaviour
The coolant pump does not respond correctly to the request. The speed of the coolant pump does not correspond to the requested speed.
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COO Coordinator
Switch, vehicle front level adjustment
All communication on the CAN bus for camera and radar has been interrupted.
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MBS
Sensor for rear engine compartment door, open circuit
The voltage supply to the control unit input for the rear engine compartment hatch sensor is 12 V. This indicates an open circuit.
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PCS
CAN message missing
The number of received messages does not match the control number.
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ICL Instrument Cluster
Communication with the tachograph (TCO)
No CAN messages from the tachograph.
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CMS
Propulsion status
Fault in propulsion status.
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DCU
Micro switch front door leaf, open circuit in closed position
The measured voltage on the 3-phase input indicates an open circuit. This occurs when the voltage is approximately 8 – 16 V with a voltage supply of 24 V to the door control unit.
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