Scania MBS DTC 546 #Not implemented. Electrical error on CAN bus 5

MBS MBS control unit · Scania

Code 546 (decimal). Some diagnostic tools show it in hexadecimal as 0222.

In short

The CAN-controller of CAN bus 5 has entered state bus-off, which indicates a communication error There is a short circuit on CAN bus 5.

Applies to: MBS3 (MBS)

What does Scania MBS fault code 546 mean?

The CAN-controller of CAN bus 5 has entered state bus-off, which indicates a communication error There is a short circuit on CAN bus 5.

What causes Scania DTC 546?

• Defect wiring of CAN-bus 5: - short circuit between CAN-high and CAN low. - short circuit between CAN-high and supply voltage. - short circuit between CAN-high and ground. - short circuit between CAN-low and supply voltage. - short circuit between CAN-low and ground. • Defect ECU unit(s) on CAN-bus 5.

How does the system react?

Functions dependent on information from CAN bus 5 are degraded, such as roof hatches and the HPAC.

What are the symptoms?

If equipped with electrical roof hatches and/or a HPAC, these may not work as intended.

How to fix Scania MBS fault code 546?

  1. The result of the receiving and transmitting messages is evaluated.
  2. Check connector for CAN bus 5 on MBS.
  3. Check wiring for CAN bus 5:
  4. Measure the resistance (with the battery disconnected) between CAN-high and CAN-low.
  5. It should be close to 60 ohm (one 120 ohm termination resistor in each end of the CAN-bus).
  6. Measure the resistance (with the battery disconnected) between CAN-high on MBS and CAN-high on any other unit (e.g.
  7. MBS_x) on CAN bus 5.
  8. It should be close to zero ohm.
  9. Measure the resistance (with the battery disconnected) between CAN-low on MBS and CAN-low on any other unit on CAN bus 5.
  10. It should be close to zero ohm.

This information is for guidance only. Always follow the manufacturer workshop manual and safety procedures; if in doubt, contact an authorised workshop.

Code 546 in other Scania systems

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