Case IH 2265 – Engine Controller (ENG / ECU): Electric Lift Pump for Engine Fuel Supply Voltage too high

The engine controller is detecting an abnormally high voltage on the circuit responsible for controlling the electric fuel lift pump (priming pump), usually pointing to a short circuit to a high voltage source.

• Steiger T4B
• Magnum MX215
• Magnum MX245
• Magnum MX275
• Magnum MX305
• Magnum 215
• Magnum 245
• Magnum 275
• Magnum 305
• Magnum 335
• Steiger 280
• Steiger 330
• Steiger 335
• Steiger STX280
• Steiger STX330
• TG Series Tractors
• Patriot SPX4420

1. 1

   Inspect the fuel priming pump control signal circuit for a short to a high voltage source.

2. 2

   Check the wiring harness and connectors between the Engine ECU and the electric lift pump for rubbed-through wires, corrosion, or melted insulation.

3. 3

   Test the electric lift pump itself for an internal short circuit.

4. 4

   Verify that the machine's overall battery/charging voltage is not spiking excessively, which can trigger high-voltage codes across engine sensors and pumps.

1. 1

   Disconnect Power

   Disconnect the machine's battery to prevent further electrical damage.

2. 2

   Repair Wiring

   If a short is found in the harness between the ECU and the lift pump, repair or replace the damaged wiring section.

3. 3

   Replace the Pump

   If the electric lift pump is internally shorted or has failed due to the voltage spike, remove the fuel lines and mounting hardware, and install the new electric lift pump.

4. 4

   Filter Replacement

   If replacing the fuel filters alongside the pump, do not pre-fill the pressure (secondary) filter. You may pre-fill the suction-side (primary/10-micron) filter from the outer inlet holes using a clean fuel source.

5. 5

   Bleed the Fuel System

   Turn the key switch to the ON position (do not crank the engine). Let the electric lift pump run for its pre-set time (approximately 30 seconds). Turn the key switch to the OFF position. Repeat this cycle a minimum of six times to thoroughly purge air from the high-pressure common-rail (HPCR) fuel system.