Scania EMD DTC 1840 Incorrect gear ratio

EMD EMD control unit · Scania · 2 variants

Code 1840 (decimal). Some diagnostic tools show it in hexadecimal as 0730.

In short

The gear ratio for the gearbox which is reported from the TMS control system does not match the gear ratio stored in the EMS control system.

Variant 1

Applies to: EMD0

What does Scania EMD fault code 1840 mean?

The gear ratio for the gearbox which is reported from the TMS control system does not match the gear ratio stored in the EMS control system.

What causes Scania DTC 1840?

There are differences in the configuration between the EMS control unit and the TMS control unit.

What are the symptoms?

The fault results in impaired gear changing performance.

How to fix Scania EMD fault code 1840?

  1. Clear the fault code and shift through all the gears.
  2. Check whether the fault code is reactivated.
  3. Spare part program the EMS control unit.
  4. Shift through all gears.
  5. Spare part program the TMS control unit.
  6. Shift through all gears.
  7. If the problem persists, contact Technical Support as there may be a problem with the SOPS configuration.

Variant 2

Applies to: EMD1

Detection

The gear ratio for the gearbox which is reported from the TMS control unit does not match the gear ratio stored in the EMS control unit.

Possible cause

There are differences in the configuration between the EMS control unit and the TMS control unit.

Symptoms

The fault results in impaired gear change performance.

How to fix

  1. Clear the fault code and shift through all the gears.
  2. Check whether the fault code is reactivated.
  3. Spare part program the EMS control unit.
  4. Shift through all gears.
  5. Spare part program the TMS control unit.
  6. Shift through all gears.
  7. If the problem persists, contact Technical Support as there may be a problem with the SOPS configuration.

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

Code 1840 in other Scania systems

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