Case IH 3102 (F-157-04) - ECU – Engine Control Unit (ECU): Fuel rail pressure sensor voltage is lower than expected.

The signal voltage returning from the fuel rail pressure sensor has dropped below the minimum acceptable threshold, indicating a short circuit to ground, a disconnected line, or an internally failed sensor.

• VESTRUM CVX
• 240 Series Axial-Flow Combines
• Magnum MX210
• Magnum MX230
• Magnum MX255
• Magnum MX285
• Magnum MX305
• Magnum 245
• Magnum 275
• Magnum 305
• Magnum 335
• Steiger STX280
• Steiger STX330
• Steiger 280
• Steiger 330
• Steiger 335
• Farmall 40
• Farmall 45
• Farmall 50
• Farmall 90C
• Farmall 95A
• Farmall 100C
• Farmall 110U
• Farmall 120C
• Maxxum 110
• Maxxum 115
• Case IH 9900 Sugarcane Harvesters

1. 1

   Check for other active codes and diagnose them in priority order.

2. 2

   Verify the tractor's battery power supply has not been connected to an external power supply (e.g., a jump box or external charger). Disconnect if present and test.

3. 3

   Visually inspect the relevant harnesses and connectors leading to the fuel rail pressure sensor for damage, bent or dislocated pins, corroded terminals, or broken wires.

4. 4

   Perform a wiggle test to verify connectors are fully seated and flex the involved harnesses to reveal any intermittent breaks or shorts to ground.

5. 5

   Check the ECU (e.g., ECU A-095) for the appropriate software version and re-flash the module if necessary.

1. 1

   Resolve wiring issues

   If the visual inspection or wiggle test reveals a short to ground or a broken wire, repair or replace the affected engine wiring harness section.

2. 2

   Replace the fuel rail pressure sensor

   If wiring, connectors, and ECU software are verified to be in good working order but the voltage remains below normal, replace the internally failed fuel rail pressure sensor.

3. 3

   Clear codes and test

   After replacing the sensor or repairing the harness, clear the fault codes and run the engine to verify the repair. Note: If the machine experiences a full power loss, an 'Emergency Re-start' feature may allow 30 seconds of operation to safely move the machine.