Massey Ferguson E2791.E – Engine Control Unit (ECU): EGR Valve Has An Internal Issue

A malfunction with the Exhaust Gas Recirculation (EGR) Valve indicating an internal circuit failure, an initialization error, or a mechanical failure (such as the valve being stuck due to carbon buildup) preventing the valve from communicating properly or moving to its commanded position.

• 7616
• 5612
• 7622
• Interim Tier 4 (2012-2015)
• 7614
• 5611
• 7615
• 5610
• 5613
• 7620
• 5609
• 7618
• 5608
• 7619
• 7626
• 7624
• MF 4707
• MF 4708
• MF 4709
• MF 4710
• MF 5608
• MF 5609
• MF 5610
• MF 5611
• MF 5612
• MF 5613
• MF 5710 SL
• MF 5711 SL
• MF 5712 SL
• MF 5713 SL
• MF 7614 through MF 7626
• MF 7714 through MF 7726S

1. 1

   Code Clearing Test: Attempt to erase the fault code using a diagnostic tool. If it clears but returns upon engine operation, the issue is likely an internal circuit failure or mechanical binding. If it cannot be cleared, the issue is likely an open circuit, short, or communication error in the wiring harness.

2. 2

   Harness Inspection: Inspect the wiring harness and the electrical connector at the EGR valve for corrosion, pushed-out pins, or chafed wires.

3. 3

   Visual/Mechanical Inspection: Remove the EGR piping to inspect for severe soot/carbon buildup that could be physically jamming the valve mechanism.

1. 1

   Preparation

   Ensure the engine is completely cool. Disconnect the negative battery terminal.

2. 2

   Access the Valve

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

3. 3

   Disconnect Electricals

   Unplug the electrical harness connector from the EGR valve actuator.

4. 4

   Hardware Removal

   Carefully remove the mounting nuts/bolts attaching the EGR valve to the EGR cooler and the bellows hot pipe. Crucial Warning: Do not dent, severely bend, or otherwise damage the bellows hot pipe during removal. If the bellows pipe is damaged, it must be replaced.

5. 5

   Remove the Valve

   Pull the EGR valve away from the cooler. Discard the old metal gaskets.

6. 6

   Clean Mating Surfaces

   Thoroughly clean the carbon and old gasket material from the mating surfaces on the EGR cooler and manifold to ensure a perfect seal.

7. 7

   Installation

   Install the new EGR valve using new gaskets. Thread the mounting hardware by hand to prevent cross-threading, then torque the nuts/bolts to the manufacturer's specification (typically around 22–26 N·m / 16–19 lb·ft depending on the specific AGCO engine).

8. 8

   Reassembly

   Reconnect the electrical harness and the battery.

9. 9

   Calibration

   Connect a diagnostic tool to clear the E2791 fault code. Run the engine and perform any required EGR initialization procedures via the diagnostic software so the ECU can learn the new valve's end-stops.