Scania EMU DTC 3166 Contactor unit R126, negative contactor, invalid current frequency

EMU EMU control unit · Scania

Code 3166 (decimal). Some diagnostic tools show it in hexadecimal as 000C5E.

In short

The control unit indicates that the current frequency of the negative contactor is outside the approved range.

Applies to: EMU1 (ECS)

What does Scania EMU fault code 3166 mean?

What causes Scania DTC 3166?

How does the system react?

What are the symptoms?

How to fix Scania EMU fault code 3166?

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