4.2.287. SPN 626, FMI 5, Grid heater relay current below normal or open circuitΒΆ

Description

The grid heater relay current is below the normal operating range.

Possible causes are:

  • The grid heater relay wiring is defective. (Open circuit.)
  • The grid heater relay 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 grid heater relay wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the operation with another grid heater relay to see if the grid heater relay is defective.