Case IH 3405 – Engine Control Unit (ECU) / EDC: ECU Power stages: Open load temperature error on the Turbocharger PWM output power stage.

The engine control module has detected an open circuit (open load) or an over-temperature condition on the Pulse Width Modulation (PWM) output circuit that controls the turbocharger wastegate actuator.

• Farmall
• skid steer
• Magnum
• Steiger
• Puma
• Maxxum
• Axial-Flow
• 7230
• 8230
• 9230
• 2388
• SR series
• SV series
• TR series
• TV series
• SR175

1. 1

   Monitor the fault to see if it clears itself, as it may be a transient temperature spike or temporary open load

2. 2

   Check the Engine Controller Waste Gate Turbocharger Actuator Red Circuit for an open load

3. 3

   Inspect the wiring harness and connectors between the EDC and the turbocharger wastegate actuator for physical damage, corrosion, or loose pins

4. 4

   Verify the EDC condition, as it may need replacement if the fault persists after wiring and actuator checks

1. 1

   Safety First

   Turn off the machine, remove the key, and let the engine and turbocharger cool completely before starting work.

2. 2

   Inspect Wiring

   Trace the wiring harness from the turbocharger wastegate actuator back to the EDC. Look for chafed wires, melted insulation, or disconnected plugs.

3. 3

   Test the Actuator Circuit

   Use a multimeter to check for continuity and verify there is no open circuit in the PWM wiring.

4. 4

   Replace the Actuator (if faulty)

   If the wiring is intact but the actuator fails electrical testing (or is mechanically seized/burnt out), replace the turbocharger wastegate actuator assembly.

5. 5

   Replace the EDC (if necessary)

   If the wiring and actuator are both in good working order but the open load/temperature error persists, the output power stage inside the EDC has failed. You will need to replace and program a new EDC.

6. 6

   Clear Codes

   Reconnect all components, power on the machine, and clear the fault codes to verify the repair.