Case IH F-2797-03 - ECU – Engine Control Unit (ECU): Injection bank 1 short circuit failure (all injectors of the same bank can be affected)

Indicates a hardware error or short circuit detected in the fuel injectors assigned to Bank 1, or a failure in their respective power stages within the control module. Because the control scheme groups individual injector control circuits into banks, a dead short in one injector or its wiring can shut down the entire bank, potentially causing a severe misfire or a complete loss of engine power.

• MAGNUM AFS Connect
• Magnum 400
• Axial-Flow Combines 240 Series
• 7230
• 8230
• 9230
• Puma Series Tractors
• Steiger Series Tractors
• Sugar Cane Harvesters A8000
• A8800
• A8810

1. 1

   Check for accompanying individual cylinder short circuit codes (e.g., DTC 6226, 6426, or 6626) to isolate the specific cylinder.

2. 2

   Visually inspect the fuel injector wiring harness for Bank 1 for chafed insulation, melted wires, or moisture intrusion in the connectors.

3. 3

   Disconnect the harness and test the resistance (Ohms) of the individual injectors on Bank 1 to rule out an internally shorted injector solenoid.

4. 4

   Check the ECU for the appropriate software version, as a re-flash may be required if no physical short is found.

1. 1

   Power Down

   Turn off the machine and disconnect the battery to prevent electrical spikes during service.

2. 2

   Isolate the Short

   Disconnect the main injector harness from the ECU and from the individual injectors on Bank 1. Use a multimeter to check for continuity to ground or continuity between the power and ground wires within the harness.

3. 3

   Repair/Replace Harness

   If a short circuit is indicated in the wiring, repair the damaged section or replace the entire injector wire harness to restore factory weather-sealed connections.

4. 4

   Replace Faulty Injectors

   If the harness tests good but an individual injector fails the resistance test (internal dead short), remove and replace the affected fuel injector.

5. 5

   ECU Service

   If neither the harness nor the injectors are shorted, the ECU's internal power stage for Bank 1 may be damaged. Re-flash the ECU with the latest software. If the code persists, the ECU must be replaced.

6. 6

   Reassembly and Clearing

   Reconnect all components, reconnect the battery, clear the inactive fault codes using a diagnostic tool, and run the engine to verify the repair.