3.2.507. SPN 977, FMI 5, Fan control output open circuitΒΆ

Description

The EEM4 monitoring system has detected an open circuit on the fan control output.

Possible causes are:

  • The fan wiring is defective.
  • The fan 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 fan control wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the fan operation.