Massey Ferguson 520215.31 – Engine Control Unit (ECU) / EEM: ECU internal fault 0108 / MOCSOP Diagnostic error

The engine module has detected an internal hardware or communication failure during its self-diagnostic checks.

• 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 4700 Series (4707, 4708, 4709, 4710)
• MF 5400 Series
• MF 6400 Series
• MF 7400 Series
• MF 7600 Series
• MF 5700 Series
• MF 6700 Series
• Models equipped with Dyna-4 and Dyna-6 transmissions

1. 1

   Connect the AGCO Electronic Diagnostic Tool (EDT) and test the original EEM unit with the latest software update to ensure a software glitch is not causing the internal fault.

2. 2

   Verify battery voltage, grounds, and the 5V DC supply to the ECU, as voltage spikes or drops can trigger false internal fault codes.

3. 3

   Check the ECU operation by temporarily connecting a known-good replacement EEM controller. If the system is functional and the fault is not active with the replacement ECU, the original ECU is confirmed defective and must be replaced.

1. 1

   Connect the EDT device to the tractor and open the EDT software.

   Ensure the diagnostic tool is properly connected to begin the ECU replacement process.

2. 2

   Select the correct tractor model and configuration options.

   Choose the appropriate settings for the specific machine in the EDT software.

3. 3

   Open the "Diagnostic Test" page, select "Save & Upload Engine Log", and push start.

   This saves the engine log information before removing the old ECU.

4. 4

   Open the "Calibration" tab, check the IQA codes from the "Injector Calibration" function, and save them.

   These codes must be saved for later use when configuring the new ECU.

5. 5

   Open "Configuration", select "Engine ECU Replacement", and push the start button.

   Initiate the ECU replacement procedure in the software.

6. 6

   Deactivate the old EEM unit.

   Click "Continue Step 1", turn the ignition switch to OFF, and wait for exactly 2 minutes until the power is completely cut off from the tractor control units.

7. 7

   Physically remove the defective EEM unit and install the new spare part EEM unit.

   Always use a new or officially remanufactured EEM spare part to avoid incorrectly adding engine hours to the machine.

8. 8

   Turn the ignition switch to ON.

   The EDT will read the serial number of the new EEM unit.

9. 9

   Follow the remaining on-screen EDT instructions.

   Activate the new EEM unit on the tractor and write the saved IQA codes to the new module.