Massey Ferguson 4.03.92 – Transmission Control Module (TRANS1): Issue With Speed Sensor Values (TRANS1)

The transmission control system is receiving erratic, out-of-range, or missing signals from the transmission input/intermediate speed sensor. Without this data, the transmission may shift roughly, fail to find the correct gear, or cause the speedometer to act up.

• 5710SL
• 5711SL
• 5712SL
• 5713SL
• T4
• 5608
• 5609
• 5610
• 5611
• 5612
• 5613
• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 6400 Series
• 6600 Series
• 6700 Series
• 7600 Series

1. 1

   Connect the tractor to the Wintest diagnostic software to check the active and requested values for the transmission speed sensor.

2. 2

   If Wintest shows incorrect values, no values, or if the problem is intermittent, test the sensor manually using a multimeter by measuring the resistance of the sensor coil when stationary.

3. 3

   Inspect the wiring harness and connectors between the speed sensor and the Transmission Control Module (TCM) for corrosion, moisture, or physical damage.

4. 4

   Ensure the sensor is receiving the correct reference voltage from the harness by checking for voltage at the connector with the ignition on.

1. 1

   Prep the Tractor

   Park the tractor on a level surface, turn off the ignition, and disconnect the battery to prevent electrical damage.

2. 2

   Locate the Sensor

   The transmission speed sensor is typically accessible from underneath the tractor on the transmission housing. (Note: On certain models/configurations, accessing transmission or engine speed sensors may require removing a rear tire for clearance).

3. 3

   Clean the Area

   Thoroughly clean the sensor mounting area and the electrical connector to prevent dirt or contaminants from entering the transmission housing.

4. 4

   Remove the Sensor

   Unplug the electrical connector and unbolt the sensor. Be prepared to partially drain the transmission fluid or catch minor fluid loss if the sensor port is below the fluid line.

5. 5

   Install the New Sensor

   Insert the replacement sensor (direct fit, no modifications needed) and secure it.

6. 6

   Reconnect

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

7. 7

   Clear Codes

   Use a diagnostic tool to clear the 04.03.92 fault code from the TRANS1 module. Test drive the tractor to ensure smooth shifting and verify the code does not return.