JCB StageV SPN 97, FMI 31, Water in Fuel Detector Detected Warning Level


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

JCB Tier 4 K0122 Boost Pressure Sensor Voltage Above Normal or Open Circuit

Reaction in EEM

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


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Examine 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.

Examine the sensor operation with water cup by sinking the sensor element to the water for 1 minute. If fault code appears sensor is functional.

Make sure the wiring from the ECU to the sensor connector is correct.

Make sure the supply voltage is right at the water detector sensor connector from pin 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.


More repair case for JCB,please refer to:JCB Trouble Repair

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