Massey Ferguson 04.00.44 – Transmission Control Module (TRANS): Issue With Signal From Transmission Mounted Engine Speed Sensor

The control module is receiving an erratic, missing, or out-of-range RPM signal from the speed sensor mounted on the transmission/flywheel housing.

• 7714
• 7715
• 7715S
• 7716
• 7716S
• 7718
• 7718S
• 7719
• 7720
• 7720S
• 7722
• 7722S
• 7724
• 7724S
• 7726
• 7726S
• Tier 4 (2015-2021)
• 6400 Series
• 6600 Series
• 6700 Series
• 7600 Series
• 8700 Series

1. 1

   Inspect the sensor wiring harness and connector for frayed wires, melted insulation, or loose pins

2. 2

   Disconnect the sensor and check for moisture or debris inside the connector. Clean with electrical contact cleaner

3. 3

   Verify the sensor is seated properly to ensure the correct sensor gap between the sensor tip and the reading wheel

4. 4

   Hook up a diagnostic scan tool to monitor the live RPM signal output from the sensor to the control module while cranking or running the engine

1. 1

   Locate the Sensor

   Locate the transmission mounted engine speed sensor, which typically mounts on the flywheel housing or the transmission input shaft cover.

2. 2

   Clean the Area

   Thoroughly clean the mounting area and connector before removal to prevent dirt or debris from falling into the transmission/flywheel housing.

3. 3

   Disconnect

   Unplug the electrical connector from the sensor.

4. 4

   Remove

   Remove the retaining bolt holding the sensor in place and carefully pull the sensor out of the housing.

5. 5

   Install

   Insert the new direct-replacement sensor. Ensure it is seated flush so that the sensor gap is correct for proper operation. Secure the retaining bolt.

6. 6

   Reconnect

   Plug the electrical connector back in, ensuring it clicks and locks into place.

7. 7

   Clear Codes

   Use a diagnostic scan tool to clear the 04.00.44 fault code and verify the proper RPM signal is restored during a test run.