Massey Ferguson 2791.31 – Engine Control Unit (ECU): EGR Valve Communication Issue

The control module has lost communication with the Exhaust Gas Recirculation (EGR) valve's electronic actuator, or the valve's internal calibration has drifted over a long period of time, preventing it from responding to module commands.

• 4710
• 7724S
• 5712SL
• Interim Tier 4 (2012-2015)
• 7722
• 7722S
• 7615
• 5613
• 5713SL
• 7720S
• 7716
• 7718
• T4
• 7715
• 5710SL
• 7726
• 7616
• 7618
• 5608
• 4708
• 7619
• 7626
• 7726S
• 7624
• 4707
• 4709
• 5711SL
• 7614
• 7718S
• 5610
• 7620
• 7719
• 7714
• 7716S
• T4 (2015-2021)
• 5612
• 7622
• 7720
• Tier 4 (2015-2021)
• 5611
• 7715S
• 5609
• 7724
• 5710 SL
• 5711 SL
• 5712 SL
• 5713 SL
• 7300
• 8700S
• 9500

1. 1

   Check the wiring harness leading to the EGR valve for chafing, breaks, or heat damage.

2. 2

   Inspect the EGR valve connector for bent pins, corrosion, or moisture.

3. 3

   Verify that the EGR valve is receiving proper operating voltage and a solid ground from the Engine ECU.

4. 4

   Check for mechanical binding or heavy soot/carbon buildup that could jam the valve, causing the internal actuator motor to fail or draw excessive current.

1. 1

   Preparation

   Turn off the tractor, remove the key, and disconnect the negative battery cable. Allow the engine and exhaust components to cool completely.

2. 2

   Access the Valve

   Remove any engine cowlings or heat shields necessary to access the EGR valve, which is typically mounted near the exhaust manifold and EGR cooler.

3. 3

   Disconnect Electronics

   Unplug the electrical connector from the EGR valve actuator.

4. 4

   Removal

   Remove the mounting bolts securing the EGR valve to the engine block or cooler. Carefully extract the valve and discard the old metal gasket.

5. 5

   Cleaning

   Inspect the EGR port and cooler for severe carbon blockages. Clean the mating surface thoroughly to ensure a proper seal.

6. 6

   Installation

   Install the new EGR valve using a new OEM gasket. Torque the mounting bolts to the manufacturer's specifications.

7. 7

   Reassembly

   Reconnect the electrical harness and reinstall any removed heat shields or panels. Reconnect the battery.

8. 8

   Calibration

   Connect a compatible diagnostic scan tool to clear the 002791.31 fault code. You will likely need to perform an EGR valve calibration/relearn procedure so the Engine ECU can learn the new valve's end-stops.