Fault code: 5772 SCANIA

Error identification:

The variable geometry turbocharger nozzle ring has an operating range which is greater than expected or the end positions have been changed.

Cause:

There is a fault in the motion of the nozzle ring, due to deposits in the variable geometry turbocharger or damage to the guide vanes for example. Or alternatively that the electric motor of the variable geometry turbocharger has not been fitted correctly.

Notes:

Can affect engine performance and gear change quality.

The engine control unit switches off the EGR circuit. May lead to a reduction in the engine power and the warning lamp lighting.

In certain applications it is not possible to clear the fault code if it is active.

Action:

If the fault code has been set after removal and fitting of the electric motor for the variable geometry turbocharger, repeat the installation using SDP3.

If the fault code has been set without removal and fitting of the electric motor for the variable geometry turbocharger:

Remove the actuator. Check that the gear segment arm can be easily moved by hand between its end positions.

If the gear segment arm cannot move freely: renew the variable geometry turbocharger.

If the gear segment arm can move freely: check that the output shaft of the electric motor has not been separated. If a fault in the electric motor has been detected, renew the electric motor.

Refit the electric motor and reinstall it using SDP3.

If the operating time since the fault code was generated exceeds 10 hours, drain the EGR cooler as there is a risk that condensed water has formed in the air-cooled EGR cooler when the EGR system was switched off. Drain according to the instructions in Workshop Manual, sub-group 01-65.