New Holland ENG 3822 – ENGINE: Throttle Valve Actuator (TVA) Circuit - Short Circuit To Battery on Out2 TVA Pin A34 error for H-bridge

This code indicates that the Engine Control Unit (ECU) has detected a short circuit to an external power source (positive battery voltage) on the Throttle Valve Actuator drive circuit. Specifically, the short is detected on "Out2" which corresponds to Pin A34 on the 60-pin engine controller connector.

• Skid Steer Loaders (SSL)
• Compact Track Loaders (CTL)
• T4 series
• Workmaster series
• Equipment utilizing the FPT F5C Engine

1. 1

   Verify the fault code is currently active.

2. 2

   Inspect the throttle valve actuator connector and the 60-pin engine ECU connector. Ensure all connections are secure, tight, and free of corrosion, abrasion, or bent pins.

3. 3

   Using a multimeter, test the wiring harness between the TVA and the ECU (specifically checking Pin A34 on the 60-pin connector) for a short to battery voltage.

4. 4

   Physically inspect the Throttle Valve Actuator to ensure the valve is not jammed or sticking, which can sometimes cause circuit overloads.

1. 1

   Turn off the machine and disconnect the battery to prevent further electrical shorts.

2. 2

   Locate the Throttle Valve Actuator (TVA) on the engine intake.

3. 3

   Disconnect the electrical connector from the TVA.

4. 4

   Disconnect the hose that runs from the TVA to the boost pressure modulator valve.

5. 5

   Remove the mounting hardware (typically two M6 bolts and two M6 nuts) securing the TVA and the intake tube.

6. 6

   Remove the old Throttle Valve Actuator and discard the old gasket.

7. 7

   Clean the mating surface.

8. 8

   Install the new TVA along with a new gasket.

9. 9

   Reinstall the intake tube and hand-thread the M6 bolts and nuts.

10. 10

    Torque the bolts and nuts to 20 - 30 N·m (15 - 22 lb ft).

11. 11

    Reconnect the boost pressure hose and the electrical connector.

12. 12

    Reconnect the battery, clear the fault codes, and run the engine to verify the repair.

13. 13

    If the harness and TVA are both perfectly functional, replace/reprogram the Engine ECU.

    The service manual dictates that the Engine ECU is faulty and must be replaced/reprogrammed if the harness and TVA are functional.