Case IH 3419 – Engine Control Unit (Engine ECU / EDC): Turbocharger - ECU Power stages: SCG error on the Turbocharger PWM output power stage

The system has detected an "SCG" (Short Circuit to Ground) on the Pulse Width Modulation (PWM) output power stage that controls the turbocharger actuator. This means the electrical circuit responsible for sending the PWM signal to the turbocharger's wastegate or variable geometry actuator has shorted out to a ground source.

• Farmall
• skid steer
• Puma 150
• Puma 165
• Puma 210
• Magnum 235-340
• Steiger Series
• Farmall 115U

1. 1

   Stop the engine and allow it to cool completely before starting work around the turbocharger for safety

2. 2

   Inspect the wiring harness running from the Engine ECU to the turbocharger PWM actuator for rubbed, melted, or pinched wires causing a short to ground

3. 3

   Inspect the actuator solenoid connector (e.g., X515 pins) and the corresponding ECU pins for corrosion, moisture, or bent pins that could bridge the circuit to ground

4. 4

   Test the turbocharger PWM actuator solenoid for an internal short to ground

1. 1

   Disconnect the battery

   Disconnect the battery to prevent electrical spikes during repair.

2. 2

   Locate the actuator

   Locate the turbocharger PWM actuator / wastegate actuator on the turbocharger assembly.

3. 3

   Disconnect the wiring harness

   Disconnect the wiring harness from the actuator.

4. 4

   Repair or replace wiring harness

   If the diagnostic checks revealed a short in the wiring harness, repair the damaged wire or replace the affected harness section.

5. 5

   Remove actuator mounting hardware

   If the wiring is intact and the actuator solenoid is internally shorted, remove the mounting hardware and linkage connecting the actuator to the turbocharger.

6. 6

   Install new actuator

   Install the new turbocharger PWM actuator and calibrate it if required by the specific engine service manual. (Note: On some specific engine models, the actuator is not serviced separately, and the entire turbocharger assembly must be replaced).

7. 7

   Reconnect components

   Reconnect the wiring harness and battery.

8. 8

   Clear fault code

   Use a diagnostic tool or DTC eraser to clear the 3419 fault code from the Engine ECU memory.