John Deere 97.04 – ECU: Water-in-Fuel Filter Signal Voltage Low

The input voltage from the water-in-fuel sensor is below the lower limit specified for low sensor voltage. This condition typically indicates a short to ground within the sensor's circuitry. A low voltage signal prevents the sensor from accurately detecting water presence in the fuel, which can risk engine health if water passes through the system undetected.

• 5085E
• 5090E
• 5090EL
• 5100E
• 5085M
• 5100M
• 5100MH
• 5100ML
• 5115ML
• 5095M
• 5095MH
• 5105M
• 5015ML
• 5090M
• 5115M
• 6110M
• 6120M
• 6130M
• 6145M
• 6155M
• 6175M
• 6195M
• 6110R
• 6120R
• 6130R
• 6145R
• 6155R
• 6175R
• 6195R
• 6215R
• 5M Series
• 5E Series
• 6000 Series
• 6230
• 6330
• 6430
• 7000 Series
• 7610
• 7710
• 7810
• 8000 Series
• 9000 Series
• 750J
• 850J
• 200D
• 330CLC
• 370C
• 644H
• 644J
• Articulated Dump Trucks
• Feller Bunchers
• Harvesters
• 9560STS
• 9670STS

1. 1

   Visual Inspection: Inspect the water-in-fuel sensor (mounted on the primary fuel filter/water separator) and its wiring harness thoroughly. Look for signs of wear, damaged insulation, or corroded connectors that might contribute to a grounding problem.

2. 2

   Electrical Circuit Test: Use a multimeter to evaluate the electrical circuit for faults. Check for a short to ground in the signal wire between the sensor connector and the ECU.

3. 3

   Grounding Check: Ensure that the sensor and its circuitry are properly grounded and isolated from potential sources of electrical interference.

4. 4

   Filter Check: Drain the fuel filter/water separator to check for actual water or debris that may be fouling the sensor probes.

1. 1

   Drain the Filter

   Turn off the engine. Place a catch pan under the primary fuel filter/water separator and open the drain valve to empty the fluid.

2. 2

   Repair Wiring

   If the diagnostic tests revealed chafed wires or a short to ground in the harness, repair or replace the damaged wiring section and replace any corroded connector pins.

3. 3

   Replace the Sensor

   If the wiring tests good, the internal circuitry of the sensor has likely failed (shorted to ground). Disconnect the electrical connector from the water-in-fuel sensor. Unscrew the old sensor from the fuel filter housing. Install the new OEM sensor and tighten to the manufacturer's specification.

4. 4

   Prime the Fuel System

   Turn the key to the ON position to allow the lift pump to prime the fuel system and fill the filter.

5. 5

   Clear Codes and Test

   Reset the engine control system using a diagnostic tool to clear the 000097.04 fault code. Start the engine and verify that the code does not return and that there are no fuel leaks around the new sensor.