Case IH 3218 – Engine Control Unit (ECU A-095) / EDC: Injection bank 2 short circuit failure (all injectors of the same bank can be affected)

The engine control system has detected a short circuit—either a high-side short to the battery or a low-side short to ground—in the wiring harness or within the internal solenoid of one or more fuel injectors grouped into Bank 2.

• Farmall
• skid steer
• Steiger T4B
• Puma series (115-230)
• Magnum series (180-380)
• Steiger / Quadtrac series (350-620)
• Maxxum series
• 240 Series Axial-Flow
• 7130
• 7230
• 8230
• 9230
• 7240
• 8240
• 9240

1. 1

   Verify that the tractor's battery is not connected to an external power supply (such as a jump starter or heavy-duty battery charger), as voltage spikes can trigger this code.

2. 2

   Check for accompanying cylinder codes (e.g., 3083, 3075, or 3067) using the Electronic Service Tool (EST) or in-cab monitor to pinpoint the specific injector.

3. 3

   Inspect the injection cable and connectors for Bank 2 for damaged, bent, or dislocated pins, corroded terminals, or chafed wires shorting against the engine block.

4. 4

   Verify that the ECU A-095 has the most up-to-date software, as pattern detection errors sometimes require an ECU re-flash.

1. 1

   Isolate the Short

   Disconnect the main wiring harness connector for the Bank 2 injectors. Turn the key on and check if the code changes from a 'short circuit' (3218) to an 'open load/circuit' code (e.g., 3224). If it changes to an open circuit, the short is located downstream in the injectors or the under-valve-cover harness.

2. 2

   Test Individual Injectors

   If the short is downstream, disconnect the injectors in Bank 2 one by one. Measure the resistance across the two terminals of each injector solenoid. A reading of near-zero ohms indicates an internally shorted injector.

3. 3

   Repair Wiring or Replace Injector

   If the wiring harness is chafed and shorting to ground/battery, repair or replace the injection cable. If an injector tests bad, replace the faulty fuel injector.

4. 4

   ECU Diagnosis

   If the wiring harness tests perfectly and all injectors have proper resistance, the fault lies within the hardware power stages of the ECU A-095 itself. You will need to replace the Engine Control Unit and follow the appropriate service tool procedure to restore self-learning parameters.