3.2.108. SPN 2791, FMI 9, EGR Valve communication errorΒΆ

Description

The EEM4 monitoring system could not receive the EGR control message from the CAN bus.

Possible causes are:

  • The EGR actuator wiring is defective.
  • The EGR actuator is defective.
  • The CAN bus is defective.

Reaction in EEM

The FC is stored and the warning lamp is activated. The CAN message indicates active fault.

Solution

First save the error log and then erase it. Restart the ECU after erasing the error log. If the fault occurs again during the next driving cycle, check the following paths:

  • Check the EGR actuator wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the operation with another EGR actuator to see if the actuator is defective.
  • Check the CAN bus operation.