4.2.339. SPN 97, FMI 31, Water in fuel

Description

The water level in the water separator has risen to the warning level. Example: condensation water.

Reaction in EEM

The FC is stored and the warning lamp is activated. Engine power will be reduced (Degradation Level 2).The CAN message indicates active fault.

Solution

Check the water separator at the bottom of the pre-filter. Drain the water from the fueling system.

If there is no water in the fueling system:

• Remove the sensor from the fuel filter and clean the sensor element
• Check the sensor operation with water cup by sinking the sensor element to the water for 1 minute. If fault code appears sensor is functional.
• Check the wiring from the ECU to the sensor connector.
• Check the supply voltage at the water detector sensor connector pins A (+12V) to pin C (GND).
• If the power supply to the sensor is correct, and there are no breaks or short circuits in the wirings -> replace the sensor.