Massey Ferguson 2791 – Engine ECU: EGR Valve Has An Internal Issue / EGR Valve Drive Circuit Voltage Extremely High

The Engine Control Unit has detected that the voltage supplied to the Exhaust Gas Recirculation (EGR) valve is remaining higher than expected (e.g., exceeding 18V for more than 5 seconds), or the internal circuitry of the EGR valve actuator has failed.

• 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
• 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
• MF 7615
• MF 7616
• MF 7618
• MF 7619
• MF 7620
• MF 7622
• MF 7624
• MF 7626
• MF 7714
• MF 7715
• MF 7716
• MF 7718
• MF 7719
• MF 7720
• MF 7722
• MF 7724
• MF 7726

1. 1

   Check battery voltage to ensure the battery is not overcharging. A faulty alternator regulator can cause system voltage to spike above 18V, triggering this code.

2. 2

   Cycle the ignition by turning the starter switch to the OFF position, waiting a few moments, and turning it back to the ON position to see if the error code returns.

3. 3

   Inspect the wiring harness and connectors between the Engine ECU and the EGR valve for a short to power or damaged pins.

4. 4

   Isolate the issue: If the fault code can be erased but returns immediately upon operation, the issue is highly likely an internal circuit failure within the EGR valve itself. If the fault code does not change or clear at all, the issue is more likely in the wiring harness.

1. 1

   Disconnect Power

   Disconnect the negative battery cable to prevent electrical shorts during repair.

2. 2

   Locate the EGR Valve

   Locate the EGR valve assembly on the engine's exhaust/intake manifold routing.

3. 3

   Disconnect Wiring

   Carefully unplug the electrical connector from the EGR valve actuator.

4. 4

   Remove the Valve

   Remove the mounting bolts securing the EGR valve to the manifold. You may also need to disconnect the EGR cooler lines depending on the specific engine layout.

5. 5

   Clean Mating Surfaces

   Thoroughly clean the mounting surfaces on the manifold to ensure a proper seal and prevent exhaust leaks.

6. 6

   Install New Valve

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

7. 7

   Reconnect

   Reconnect the EGR electrical connector and the battery.

8. 8

   Clear Codes and Calibrate

   Turn the ignition ON. Use a compatible diagnostic scan tool to clear the 002791.00 fault code. Some engine ECUs may require an EGR initialization or calibration routine to learn the new valve's position limits.