Scania fault code 520
Code 520 is used by 17 different Scania systems. Choose the control unit shown in your diagnostic tool:
EMS Engine Management System
Injector cyl. 8 cable/injector open load
The engine control unit has detected an abnormal voltage, indicating a break in the circuit.
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TMS Transmission Management System
Switch for manual or automatic gear shifting, CAN message fault
The control unit indicates a signalling fault in the gear lever switch for selecting between manual or automatic gearshift.
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BMU Battery Management Unit
CAN communication for TMS SUB CAN missing
Communication error. TMS SUB CAN has an open circuit. The fault is detected if the control unit tries to send CAN messages on TMS SUB CAN and does not receive any acknowledgement f…
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EMD
Cylinder 8
Open circuit detected in the injector solenoid valve or in the electrical cables to the injector.
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EME
Cylinder 8
Open circuit detected in the injector solenoid valve or in the electrical cables to the injector.
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EMO
Injector cyl. 8 cable/injector open load
Permanent open circuit detected on the injector coil(s) or the cabling to the injector(s). Faults detected only when engine is running.
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VDT
Output signal
Short circuit to ground on output for control unit E754.
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COO Coordinator
Fuel level
The voltage in the fuel level sensor circuit has been above the permitted level.
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MBS
CAN bus (external), no communication
The MBS control unit fails to detect communication on the CAN bus within the set time period.
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CUV Visibility system
CAN communication
Communication error. The yellow CAN bus has an open circuit.
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BCI
Communication fault, CAN bus for expansion units
Open circuit in cable harness to the CAN bus for expansion units.
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LAS Locking and Alarm System
Motion sensor in bodywork
The bodywork motion sensor has no communication with control unit pin C4.
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CMS
CAN communication
Communication error or overload on the orange CAN bus.
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ALM
Micro switch rear door driver's side (truck)/micro switch A3 (bus), open circuit
Open circuit in the micro switch.
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ACS Articulation Control System
Orange CAN bus
Communication fault in the orange CAN bus.
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TCC
TCC control unit, external CAN bus missing
The TCC control unit has not received CAN notification on an external CAN bus for a certain amount of time.
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ACSX
Orange CAN bus
Communication fault in the orange CAN bus.
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