3.2.81. SPN 1639, FMI 19, Fan speed request CAN signal missingΒΆ

Description

The EEM4 system was unable to receive a valid fan speed request via CAN.

Possible causes are:

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