New Holland 3818 – ECU: Throttle Valve Actuator Circuit Open Load

This fault code triggers an amber warning light indicating a Throttle Valve Actuator (TVA) Circuit Open Load Error for the power stage. It signifies an electrical open circuit in the power supply to the throttle valve actuator. While it is a non-critical issue that allows the machine to continue operating, it will likely force the engine into a reduced power or limp mode.

• L230
• L213
• L215
• L216
• L218
• L220
• L221
• L223
• L225
• L228
• L234
• C227
• C232
• C234
• C237
• C238
• C245

1. 1

   Verify battery and charging system voltage, as low voltage can trigger various electrical faults

2. 2

   Listen for a rapid clicking sound from the relays at startup, which indicates a problem with the main power or EH control module relay

3. 3

   Inspect electrical connections, focusing on poor grounding, corroded connections, or loose wires at the main power relay and EH control module relay

4. 4

   Examine wiring harnesses and the fuse box for visible damage, chafing, or corrosion

1. 1

   Disconnect power

   Turn off the machine and disconnect the battery to ensure safety before beginning electrical repairs.

2. 2

   Clean and secure grounds

   Locate the main power and EH control module relay grounds. Disconnect them, clean all contact surfaces of any corrosion or dirt, and securely re-fasten.

3. 3

   Inspect and test relays

   Identify the main power and EH control module relays. Test them by swapping with a known good relay of the same type. Replace if the original relay is faulty.

4. 4

   Inspect actuator wiring

   Trace the wiring from the ECU to the Throttle Valve Actuator. Look for breaks, chafing, or damaged insulation and repair any damaged sections.

5. 5

   Check connectors

   Disconnect and inspect the electrical connectors at the ECU and the Throttle Valve Actuator. Ensure pins are clean, not bent or corroded, and make a secure connection.

6. 6

   Replace Throttle Valve Actuator

   If the wiring, relays, and connections are confirmed to be in good condition, the Throttle Valve Actuator itself may be faulty and should be replaced.

7. 7

   Clear fault code

   Reconnect the battery, start the machine, and use a diagnostic tool to clear the fault code from the ECU. Verify the code does not reappear.