Case IH 2266 (519186.05) - DEC – Engine Controller (ENG): Electric Lift Pump for Engine Fuel Supply Voltage too low

The engine control module (ECM) has detected an out-of-range signal—specifically, an open circuit or abnormally low voltage/current, meaning the ECM is not detecting the proper voltage supplying the electric lift pump for the engine fuel supply.

• MAXXUM T4E
• MX Magnum
• TG Series

1. 1

   Inspect the wiring harness and connectors leading to the electric lift pump (or the suspected solenoid) for any signs of wear, corrosion, or physical damage.

2. 2

   Ensure the connector is fully seated and that no pins are pushed back or corroded.

3. 3

   Use a multimeter to test the wiring between the component and the ECM to verify continuity and rule out a broken wire.

4. 4

   Test the resistance of the component itself (lift pump motor or solenoid coil) to ensure it is not internally shorted or open.

1. 1

   Disconnect battery

   Disconnect the battery to ensure safety while working on the electrical system.

2. 2

   Repair wiring or replace connector

   If the diagnostic checks reveal a broken wire or corroded connector between the ECM and the component, repair the wiring harness or replace the damaged connector pigtail.

3. 3

   Replace faulty component

   If the wiring is intact but the component failed the resistance test, remove the faulty electric lift pump (or solenoid) and install the replacement part.

4. 4

   Reconnect wiring harness

   Reconnect the wiring harness, ensuring the connector clicks securely into place.

5. 5

   Reconnect battery

   Reconnect the battery.

6. 6

   Clear fault code

   Clear the fault code from the ECM using a diagnostic tool and restart the system to confirm the fix.