Massey Ferguson 04.02.28 – TRANS: Issue With Signal Voltage From Transmission Actuator (TRANS)

This indicates that the transmission control system is receiving an abnormal or out-of-range electrical voltage signal from the transmission actuator. This condition is typically caused by a failing actuator, an internal position sensor fault, or a wiring issue (such as a short circuit, open circuit, or corroded connector) disrupting the signal.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)

1. 1

   Inspect the wiring harness and connectors running between the TRANS module and the transmission actuator for rubbed wires, corrosion, bent pins, or moisture ingress.

2. 2

   Using a multimeter, verify the supply voltage and ground at the transmission actuator connector.

3. 3

   Test the signal wire for continuity back to the TRANS module. Check for a short to ground or a short to power on the signal circuit.

4. 4

   If the wiring is intact and supplying the correct voltage/ground, the internal sensor of the transmission actuator is likely faulty and failing to return the correct signal voltage.

1. 1

   Safely park the tractor on level ground, engage the parking brake, turn off the engine, and disconnect the battery to prevent electrical shorts.

   Safely park the tractor on level ground, engage the parking brake, turn off the engine, and disconnect the battery to prevent electrical shorts.

2. 2

   Locate the transmission actuator on the transmission housing.

   Locate the transmission actuator on the transmission housing.

3. 3

   Disconnect the electrical connector from the actuator and move the harness aside.

   Disconnect the electrical connector from the actuator and move the harness aside.

4. 4

   If the diagnostic checks pointed to a wiring fault, repair or replace the damaged section of the harness.

   If the diagnostic checks pointed to a wiring fault, repair or replace the damaged section of the harness.

5. 5

   If the actuator itself is faulty, remove the mounting hardware securing the actuator to the transmission block and carefully remove the unit.

   If the actuator itself is faulty, remove the mounting hardware securing the actuator to the transmission block and carefully remove the unit.

6. 6

   Clean the mounting surface. Install the new transmission actuator and torque the mounting bolts to OEM specifications.

   Clean the mounting surface. Install the new transmission actuator and torque the mounting bolts to OEM specifications.

7. 7

   Reconnect the electrical connector, ensuring it clicks securely into place.

   Reconnect the electrical connector, ensuring it clicks securely into place.

8. 8

   Reconnect the battery.

   Reconnect the battery.

9. 9

   Calibration: Because a transmission control component was replaced, you must perform a transmission calibration using the tractor terminal or the EDT diagnostic tool to ensure the TRANS module learns the new actuator's parameters.

   Calibration: Because a transmission control component was replaced, you must perform a transmission calibration using the tractor terminal or the EDT diagnostic tool to ensure the TRANS module learns the new actuator's parameters.

10. 10

    Clear the stored 04.02.28 fault code from the system and test drive the tractor to verify smooth shifting and that the code does not return.

    Clear the stored 04.02.28 fault code from the system and test drive the tractor to verify smooth shifting and that the code does not return.