Case IH 3862 – Engine Control Unit (ECU) / EDC: EVGT electrical failure (motor)

The control module has detected an electrical malfunction specifically within the internal motor circuit of the turbocharger's electronic actuator.

• Magnum 250
• Magnum 280
• Magnum 310
• Magnum 340
• Magnum 370
• Magnum 380
• Magnum Rowtrac variants
• Optum 270
• Optum 300
• Steiger 350
• Steiger 400
• Steiger 425
• Steiger 450
• Steiger 475
• Steiger 500
• Steiger 525
• Steiger 550
• Steiger 600
• Quadtrac 350
• Quadtrac 400
• Quadtrac 425
• Quadtrac 450
• Quadtrac 475
• Quadtrac 500
• Quadtrac 525
• Quadtrac 550
• Quadtrac 600

1. 1

   Check the dedicated EVGT actuator fuse (e.g., 20A Mini fuse F-203) for a blown condition.

2. 2

   Inspect the engine wiring harness connecting the ECU to the EVGT actuator for chafed wires, melted insulation, or short circuits, especially near the hot exhaust manifold.

3. 3

   Disconnect the EVGT actuator plug and inspect for water intrusion, corrosion, or pushed-out pins.

4. 4

   Check for mechanical binding in the turbocharger; severe carbon buildup can jam the variable vanes, causing the actuator motor to over-amp and trigger this electrical code.

1. 1

   Disconnect Power

   Turn off the battery disconnect switch to ensure the ECU is powered down before servicing the electrical system.

2. 2

   Fuse Replacement

   If the EVGT fuse is blown, replace it with a new 20A fuse. If it blows again immediately upon key-on, there is a dead short in the harness or the actuator motor itself.

3. 3

   Harness Repair

   If wiring damage is found during the diagnostic phase, repair the broken wires or replace the specific EVGT engine harness section.

4. 4

   Actuator / Turbocharger Replacement

   If the wiring and power supply are verified as good, the internal motor of the EVGT actuator has failed. Depending on the specific FPT engine and turbo manufacturer, the electronic actuator may not be available separately because it is factory-calibrated to the turbocharger housing. In this case, the entire EVGT turbocharger assembly must be replaced.

5. 5

   Relearn Procedure

   After replacing the actuator or turbocharger, use the Case IH Electronic Service Tool (EST) to clear the fault codes. The ECU may need to perform an initialization/learn procedure to learn the end-stops of the new actuator.