Case IH 3830 – ENGINE: Throttle Valve Actuator - DFC for valve position sensor physical SRC high

The Engine Control Unit (ECU) is receiving a signal voltage from the Throttle Valve Actuator (TVA) position sensor that exceeds the maximum expected physical range, indicating a Short Circuit to a High voltage source.

• Farmall
• skid steer
• SR175
• SV280B
• SV300
• TR270B
• TV370B
• Farmall 95U Pro EP
• Farmall 105U Pro EP
• Farmall 115U Pro EP
• Puma
• Steiger

1. 1

   Inspect the wiring harness and connectors running between the Engine ECU and the Throttle Valve Actuator (TVA) for chafed wires, melted insulation, or corrosion inside the connector pins.

2. 2

   Disconnect the TVA harness, turn the key ON (engine off), and use a multimeter to check the signal wire for voltage. If battery voltage (12V) or an abnormally high reference voltage is present, the wiring harness has a short to power and must be repaired.

3. 3

   If the wiring harness tests normal (no short to power in the harness), the short is likely internal to the Throttle Valve Actuator's position sensor.

1. 1

   Disconnect Power

   Disconnect the battery ground cable. Note: OEM manuals stress that the electronic monitoring system can be damaged if the battery is not disconnected before major electrical work.

2. 2

   Locate the TVA

   Locate the Throttle Valve Actuator on the engine's intake air circuit.

3. 3

   Disconnect Harness

   Unplug the electrical connector from the TVA.

4. 4

   Remove the Actuator

   Remove the mounting hardware securing the TVA to the intake manifold/piping. Remove the faulty valve.

5. 5

   Prep the Surface

   Clean the mating surface on the intake manifold to ensure a proper seal.

6. 6

   Install the New Part

   Install the new Throttle Valve Actuator along with a new gasket/seal. Torque the mounting hardware to OEM specifications.

7. 7

   Reconnect

   Plug the electrical connector back into the new TVA and reconnect the battery ground cable.

8. 8

   Clear Codes

   Connect a diagnostic tool to the machine, clear the inactive 3830 fault code, and run the engine to verify the repair.