Massey Ferguson 04.03.90 – TRANS1: Issue With Speed Sensor Values (TRANS1)

The transmission controller is receiving erratic, implausible, or missing data from the transmission speed sensor (often the input shaft or intermediate speed sensor).

• 7724S
• 5712SL
• 7722
• 7722S
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7726S
• 5711SL
• 7718S
• 7719
• 7714
• 7716S
• 7720
• Tier 4 (2015-2021)
• 7715S
• 7724
• 5400 Series
• 5600 Series
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 5700 Series
• 6400 Series
• 6600 Series
• 6700S Series
• 7600 Series
• 7700 Series
• 7700S Series
• 8400 Series
• 8600 Series

1. 1

   Connect the tractor to the Wintest diagnostic software to monitor the active and requested values of the transmission speed sensors

2. 2

   Inspect the sensor's electrical connector and the wiring harness for moisture intrusion, corrosion, water ingress, or physical damage

3. 3

   Test the sensor with a multimeter to verify resistance (specifications often call for approximately 540 Ohms)

4. 4

   Check for physical damage to the sensor tip or heavy debris buildup on the transmission housing

1. 1

   Disconnect Power

   Always disconnect the tractor's battery before starting work to prevent electrical damage to the sensitive transmission modules.

2. 2

   Locate the Sensor

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

3. 3

   Removal

   Disconnect the electrical connector from the sensor. Remove the mounting bolt or unscrew the sensor from the housing.

4. 4

   Cleaning

   Thoroughly clean the sensor mounting area and the electrical connector to ensure no dirt or moisture enters the new connection.

5. 5

   Installation

   Install the new direct-replacement sensor.

6. 6

   Reconnection

   Plug in the electrical harness, ensuring the weather-resistant seal is fully seated to prevent future moisture intrusion.

7. 7

   Final Steps

   Reconnect the battery. Use the Wintest diagnostic tool to clear the 04.03.90 fault code from the TRANS1 module. Note that some electronic transmission systems may require a reset or calibration procedure after a speed sensor replacement.