Scania EMS DTC 4866 Rotational speed signals, rotational speed sensor T74

EMS Engine Management System · Scania · 3 variants

Code 4866 (decimal). Some diagnostic tools show it in hexadecimal as 1302.

In short

The rotational speed signal from rotational speed sensor T74 is lower than it should be for the current rotational speed.

Variant 1

Applies to: EMS S7EMS S8 (S8PDE)

What does Scania EMS fault code 4866 mean?

What causes Scania DTC 4866?

How does the system react?

How to fix Scania EMS fault code 4866?

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Variant 2: Rotational speed sensor or starter motor

Applies to: EMS S6

Variant 3

Applies to: EMS S8

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

Code 4866 in other Scania systems

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