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?

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

What causes Scania DTC 3166?

- Fault in cable harness or connector. - Contactor fault. - Fault in control unit E159.

How does the system react?

A yellow warning indication is displayed.

What are the symptoms?

The electric power take-off does not work.

How to fix Scania EMU fault code 3166?

  1. Check the cable harness, connectors, contactor and control unit.
  2. Check if the contactor can be opened and closed.
  3. Replace the contactor.
  4. Replace control unit E159.

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