Scania EMS DTC 4609 Rotational speed sensor or starter motor

EMS Engine Management System · Scania · 6 variants

Code 4609 (decimal). Some diagnostic tools show it in hexadecimal as 1201.

In short

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

Variant 1

Applies to: EMS S6 IoM singlespeed (S6IM)EMS S6

What does Scania EMS fault code 4609 mean?

What causes Scania DTC 4609?

How does the system react?

How to fix Scania EMS fault code 4609?

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Variant 2: Engine speed above normal operating range

Applies to: EMS10

Variant 3

Applies to: EMS S6 (EMS S6 EuroIII)

Variant 4: Engine speed, engine overspeed protection

Applies to: EMS S7

Variant 5: Engine speed, engine overspeed protection

Applies to: EMS S8

Variant 6: Engine speed, engine overspeed protection

Applies to: EMS S8 (S8PDE)

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

Code 4609 in other Scania systems

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