New Holland 3823 – ECU: Short Circuit to Ground on Out1 Error for H-bridge

The Engine Control Unit (ECU) has detected a short circuit to ground on the first output (Out1) of an H-bridge circuit. Electrical current from the Out1 terminal is unintentionally flowing directly to the vehicle's chassis or another ground point instead of through the intended component. This condition may affect the proper operation of the connected component (often a straw hood actuator or motor) and typically occurs due to a damaged wire, a faulty connector, or an internal failure within the component.

• CR10.90
• CR6.80
• CR6.90
• CR7.90
• CR8.80
• CR8.90
• CR9.90
• CX8.80
• CX8.90
• Pro-Belt 450
• Pro-Belt 460
• Roll-Belt 450
• Roll-Belt 460
• Roll-Belt 550
• Roll-Belt 560

1. 1

   Visually inspect the wiring harness going to the straw hood assembly for signs of physical damage, such as chafing, cuts, or heat damage.

2. 2

   Disconnect and inspect the electrical connectors at the H-bridge module and at the component on the straw hood for corrosion, bent or pushed-out pins, and moisture intrusion.

3. 3

   Identify the specific wire corresponding to the Out1 circuit from the H-bridge module using a wiring diagram.

4. 4

   With connectors disconnected, use a multimeter to perform a continuity to ground test on the Out1 wire. There should be no continuity (an open circuit).

5. 5

   If the wiring harness tests good, test the connected component (e.g., actuator or motor) for an internal short to ground according to manufacturer specifications.

1. 1

   Isolate the fault

   Based on the diagnostic checks, determine if the fault is in the wiring harness or the connected component.

2. 2

   Repair wiring harness

   If a short is found in the harness, repair the damaged section of wire, ensuring it is properly insulated and protected. If the damage is severe, replace the entire harness section.

3. 3

   Replace connected component

   If diagnostic checks point to an internal short in the controlled component (e.g., straw hood actuator), replace the component.

4. 4

   Replace H-Bridge module

   If both the wiring and the component test good, the H-bridge module itself may be faulty and should be replaced.

5. 5

   Clear fault codes

   After completing the repair, clear the fault codes using a diagnostic tool and run the machine to ensure the fault does not return.