New Holland 3824 – ECU: Throttle Valve Actuator Short to Ground

The Engine Control Unit (ECU) has detected a short circuit to ground on the electrical circuit for the Throttle Valve Actuator (TVA). Specifically, the fault is located on the wire connected to pin A34 of the engine's 60-pin connector, which corresponds to the second output (Out2) for the H-bridge controlling the throttle valve. This condition diverts the electrical signal to the vehicle's ground, preventing the throttle valve from operating as commanded and leading to engine performance issues.

• T4.55
• T4.65
• T4.75
• T4.85
• T4.95
• T4.105
• T4.115
• T4S.55
• T4S.65
• T4S.75
• T5.75
• T5.85
• T5.95
• T5.105
• T5.115
• PowerStar 75
• PowerStar 90
• PowerStar 100
• PowerStar 110
• PowerStar 120
• B90B
• B95B
• B100C
• B110C
• L221
• L228
• L230
• C232
• C238
• Farmall 55C
• Farmall 115C
• Farmall 55A
• Farmall 115A
• 580N
• 580Super N
• TR310
• TV370

1. 1

   Check battery voltage (ensure 12.6V) and verify main ground straps to the chassis are clean and tight, as low voltage can trigger erroneous codes.

2. 2

   Visually inspect the wiring harness between the ECU and the Throttle Valve Actuator for chafing, cuts, melting, or corrosion.

3. 3

   Disconnect and inspect connectors at the ECU (60-pin connector) and the Throttle Valve Actuator for corrosion, moisture, or damaged pins (ensure pin A34 is secure and not pushed back).

4. 4

   Perform a continuity to ground test on the harness side of pin A34 to a known good chassis ground (should read as an open circuit/infinite resistance).

5. 5

   Perform an internal short test on the actuator by measuring resistance between the actuator's A34 corresponding pin and its ground pin or casing.

1. 1

   Isolate the fault

   Based on diagnostic checks, determine whether the short circuit to ground is located within the wiring harness or is internal to the Throttle Valve Actuator.

2. 2

   Repair wiring harness

   If the fault is in the wiring harness, repair the damaged section of the wire connected to pin A34 or replace the affected harness section. Ensure all repairs are properly insulated and protected from future damage.

3. 3

   Replace Throttle Valve Actuator

   If diagnostic tests confirm the Throttle Valve Actuator is internally shorted, replace the actuator assembly, as it is not a serviceable component.

4. 4

   Perform idle relearn procedure

   Turn the ignition to the 'ON' position (without starting) for a few seconds, turn it off, and repeat. Then start the engine and allow it to idle for 5-10 minutes to let the ECU recalibrate to the new component.

5. 5

   Clear fault codes

   Use a diagnostic tool to clear fault code 3824 from the ECU and verify that the code does not return.