Massey Ferguson 3573.03 – Engine Control Unit (ECU): Air Throttle Valve Position Sensor Voltage High

The measured voltage from the throttle valve's internal position sensor is above the normal operating range, meaning the controller is receiving a signal that is too high (often caused by a short to power, an open circuit, or a failed internal sensor).

• 4710
• 7724S
• 5712SL
• 7722S
• 7722
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 4708
• 7726S
• 4707
• 4709
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626

1. 1

   Clear and Reset: Save the error log, clear the codes using a diagnostic tool (like the WinEEM4 Service Tool), and restart the ECU. If the fault returns during the next drive cycle, proceed to physical checks.

2. 2

   Inspect Wiring: Check the wiring harness leading to the Air Throttle Valve. Look for chafed wires that could cause a short to power or an open circuit.

3. 3

   Inspect Connectors: Disconnect the throttle valve harness connector. Inspect the contact surfaces of the pins for oxidation, moisture, or pushed-out pins.

4. 4

   Check Power Supply: Verify that the power supply to the throttle valve sensor is correct.

5. 5

   Component Testing: If the wiring and power supply are intact, the sensor itself (which is integrated into the throttle valve actuator) is likely defective.

1. 1

   Turn off the tractor, remove the key, and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the Air Throttle Valve in the engine's air intake system.

   It is typically mounted in the air piping between the intercooler (charge air cooler) and the intake manifold.

3. 3

   Disconnect the electrical harness connector from the throttle valve actuator.

4. 4

   Loosen the clamps or remove the retaining bolts securing the throttle valve to the intake piping.

5. 5

   Remove the faulty throttle valve assembly and clean the mating surfaces on the intake piping to ensure a good seal.

6. 6

   Install the new throttle valve assembly, ensuring any O-rings or gaskets are properly seated.

7. 7

   Tighten the mounting bolts or clamps to the manufacturer's specified torque.

8. 8

   Reconnect the electrical harness connector until it clicks into place.

9. 9

   Reconnect the battery.

10. 10

    Use a diagnostic tool to clear the fault codes.

    Start the engine and verify that the code does not return and that the engine operates normally without derating.