Case IH 19472 – Engine Control Unit (ECU) / Engine Control Module (ECM): Short circuit to ground error at the High Side of Exhaust flap powerstage

The control module has detected a short circuit to ground on the high-voltage side of the electrical circuit that supplies power to the exhaust flap actuator.

• Tier 4b
• Case IH Vestrum
• Case IH Maxxum
• Case IH Puma
• Case IH Optum
• Case IH Magnum
• Case IH Steiger / Quadtrac

1. 1

   Inspect the wiring harness between the Engine ECU and the exhaust flap actuator for chafed wires, melted insulation, or pinched lines that could cause the high-side power wire to short against the chassis ground.

2. 2

   Disconnect the exhaust flap actuator and measure resistance across pins 4 and 5. It should measure approximately 60 Ω. If resistance is incorrect or shows continuity to ground, the internal actuator motor is shorted.

3. 3

   Use the CNH Electronic Service Tool (EST) or PT-Box to check for accompanying engine CAN faults (e.g., ECU2FLP), as a shorted actuator can pull down network voltages.

4. 4

   Check the exhaust flap actuator for signs of severe overheating or physical binding, which can cause internal circuitry to fail.

1. 1

   Preparation

   Turn off the machine, disconnect the battery, and allow the engine and exhaust system to cool completely.

2. 2

   Drain Coolant

   Drain the engine coolant to prevent spills, as the actuator has coolant lines routed to it.

3. 3

   Disconnect Components

   Disconnect the electrical connector and the coolant lines from the exhaust flap actuator.

4. 4

   Remove the Valve

   Remove the V-band clamps or fastening nuts securing the exhaust flap to the turbocharger outlet and the exhaust front pipe/DOC frame.

5. 5

   Install New Valve

   Position the new exhaust flap valve assembly and secure it with the exhaust clamps/hardware.

6. 6

   Reconnect

   Reconnect the engine coolant lines and the electrical connector.

7. 7

   Refill Fluids

   Refill the engine cooling system with the specified coolant and bleed any air from the system.

8. 8

   Clear Codes

   Reconnect the battery, use the CNH EST to clear the 19472 fault code, and perform a stationary warm-up test to verify the flap operates correctly without throwing a code.