Massey Ferguson T117 – Transmission Controller (TRANS2): There Is A Speed Reading from The PTO Speed Sensor That Does Not Match The Speed Selected Switch Dyna 6 (TRANS2)

This indicates a mismatch condition where the physical RPM reading detected by the PTO output speed sensor does not align with the expected RPM range dictated by the PTO speed selector switch (e.g., 540, 540E, or 1000 RPM). This can be caused by a faulty sensor, a wiring issue, a failing selector switch, or mechanical slippage in the PTO clutch.

• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• Interim Tier 4 (2012-2015)
• Tier 4 (2015-2021)
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• 6613
• 6614
• 6615
• 6616
• 6713
• 6714
• 6715
• 6716
• 6717
• 6718
• 7617

1. 1

   Perform a resistance test on the PTO speed sensor by disconnecting it at room temperature (0 kph) and measuring across the pins. A healthy inductive speed sensor should measure 450 Ohms +/- 20 Ohms.

2. 2

   Verify the sensor adjustment and clearance to the tone ring/gear, as vibration can cause it to back out.

3. 3

   Inspect the physical aspect of the harness pins for corrosion, short circuits to ground, or short circuits to +12V.

4. 4

   Ensure the PTO speed selector switch is not mechanically or electrically faulty (e.g., locked in a deactivated position or sending an erratic signal).

1. 1

   Locate the Sensor

   The PTO speed sensor is mounted near the rear PTO output shaft housing. Access can be tight.

2. 2

   Clean the Area

   Thoroughly clean the mounting area and electrical connections before removal to prevent debris from entering the transmission housing.

3. 3

   Remove and Replace

   Disconnect the wiring harness, unthread the old sensor, and install the new sensor. Ensure automotive-grade sealing is maintained.

4. 4

   Clear Codes

   After installation, use a diagnostic tool or the tractor's dashboard display to clear the T117 fault code.

5. 5

   Validate Operation

   Start the tractor, engage the PTO, and verify through the display that you have steady RPM readings that match the selected implement speed (e.g., 540 or 1000 RPM).