3.2.167. SPN 3512, FMI 4, 12V sensor supply 1 voltage below normalΒΆ

Description

The EEM4 monitoring system has detected an internal failure. A possible reason for this is:

  • The water in the fuel sensor is defective.
  • The ECU 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 water in the fuel sensor wiring, the connectors and the contact surfaces of the connector pins (possible oxidation).
  • Check the operation with another water in fuel sensor to see if the sensor is defective.
  • Check the ECU operation with another EEM4 controller. If the system is functional and the fault is not active with the replacement ECU, then the original ECU is defective.

See Water in fuel sensor for reference.