Massey Ferguson 04.0.90 – TRANS: Issue With Speed Sensor Values (TRANS)

The transmission control module is receiving erratic, missing, or out-of-range signals from the transmission input shaft speed sensor. The electronic transmission relies on accurate speed data from this sensor to manage smooth shifting and precision controls; when it fails, you may experience rough shifting, an inability to find the right gear, or an erratic speedometer.

• 4707
• 4708
• 4709
• 4710
• T4 (2015-2021)
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5710SL
• 5711SL
• 5712SL
• 5713SL
• 7614
• 7615
• 7616
• 7618
• 7619
• 7620
• 7622
• 7624
• 7626
• 7714
• 7715
• 7715S
• 7716
• 7718
• 7719
• 7720
• 7722
• 7724
• 7726
• 6465
• 6475
• 6480

1. 1

   Verify Symptoms: Check if the tractor is exhibiting rough shifting, failing to engage the correct gear, or showing erratic speedometer readings.

2. 2

   Inspect Wiring and Connectors: Inspect the wiring harness leading to the transmission speed sensor for chafing, breaks, or corrosion.

3. 3

   Check for Debris: Ensure the sensor mounting area is not heavily caked in mud or debris that could be interfering with the connection or the sensor's magnetic field.

1. 1

   Disconnect Power

   Always disconnect the battery before starting work to prevent electrical damage to the transmission module.

2. 2

   Locate the Sensor

   The transmission input shaft speed sensor is typically accessible from underneath the tractor, mounted directly into the transmission housing.

3. 3

   Clean the Area

   Thoroughly clean the sensor mounting area and the electrical connector before removal to prevent dirt and contaminants from falling into the transmission.

4. 4

   Remove the Sensor

   Unplug the electrical connector and unscrew the faulty sensor from the housing.

5. 5

   Install the New Sensor

   Thread the new direct-replacement sensor into the transmission housing (many use an M20x1.5 thread).

6. 6

   Reconnect

   Plug the electrical connector back in and reconnect the tractor's battery.

7. 7

   Clear Codes

   After installation, use a diagnostic tool to clear the 04.0.90 transmission fault code from the system.