Scania EMU DTC 4166 Refrigerant compressor E157, high temperature

EMU EMU control unit · Scania

Code 4166 (decimal). Some diagnostic tools show it in hexadecimal as 001046.

In short

The refrigerant compressor reports too high a temperature.

Applies to: EMU1 (ECS)

What does Scania EMU fault code 4166 mean?

The refrigerant compressor reports too high a temperature.

What causes Scania DTC 4166?

- Fault in refrigerant compressor E157. - Wrong amount of refrigerant. - Blockage or contamination in the cooling circuit. - Fault in sensor T6 - Fault in coolant pump M86.

How does the system react?

Refrigerant compressor E157 turns off immediately.

What are the symptoms?

Impaired cab cooling.

How to fix Scania EMU fault code 4166?

  1. Check the refrigerant level and, if necessary, fill with refrigerant.
  2. Search for blockage or contamination in the cooling circuit.
  3. Check cables and hoses.
  4. Check refrigerant compressor E158.
  5. Check sensor T6.
  6. Check coolant pump M86.

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

Code 4166 in other Scania systems

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