4.2.91. SPN 2791, FMI 31, EGR Valve not present

Description

EEM4 monitoring system can’t discover EGR actuator.

Possible causes are:

• 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.