Massey Ferguson 2791.1 – Engine Control Unit (ECU): Issue With EGR Valve (ECU)

This code indicates that the engine's control system has detected a malfunction with the Exhaust Gas Recirculation (EGR) valve. The underlying condition is typically a mechanical failure (such as the valve sticking due to heavy carbon/soot buildup), an internal electrical failure of the valve's actuator, or a communication/wiring issue preventing the valve from operating at its requested position.

• 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
• 6600 series
• 8700 series
• IDEAL combines

1. 1

   Inspect the wiring harness and electrical connector at the EGR valve for corrosion, bent pins, or chafed wires that could cause a communication loss to the ECU.

2. 2

   Remove the EGR valve and inspect the internal valve pintle and intake manifold ports for heavy carbon and soot buildup.

3. 3

   Using an AGCO diagnostic tool, command the EGR valve to open and close. Monitor the 'Requested Position' versus the 'Actual Position' to see if the valve is mechanically binding.

4. 4

   Verify that the EGR valve is receiving proper voltage and ground from the ECU harness.

1. 1

   Preparation

   Turn off the tractor, remove the key, and disconnect the negative battery cable to prevent electrical shorts.

2. 2

   Locate the Valve

   Locate the EGR valve module, which is typically mounted near the exhaust manifold and EGR cooler assembly.

3. 3

   Disconnect

   Unplug the electrical connector from the EGR valve.

4. 4

   Removal

   Remove the mounting bolts securing the EGR valve to the engine block or cooler. Carefully remove the valve, ensuring no debris falls into the intake or exhaust ports.

5. 5

   Cleaning

   If the valve is mechanically sound but clogged, use a dedicated EGR/carbon cleaner to remove soot from the valve and the mating ports on the engine.

6. 6

   Replacement

   If the valve has failed internally, install the new EGR valve. Always use a new OEM gasket to prevent exhaust leaks.

7. 7

   Reassembly

   Torque the mounting bolts to the engine manufacturer's specifications. Reconnect the electrical harness.

8. 8

   Clear Codes

   Reconnect the battery, turn on the ignition, and use a diagnostic scanner to clear the 002791.10 fault code. Start the engine and verify the code does not return.