Massey Ferguson E520229.13 – Engine Control Unit (ECU) / EEM4: Engine Module Internal Issue

Internal hardware or calibration memory of the engine controller has failed or corrupted (ECU internal fault 0122 or Fast A/D Converter calibration error).

• 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
• 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

   Verify and measure that the 12V supply voltage to the ECU is within limits to rule out alternator overcharging or severely low battery voltage.

2. 2

   Connect the AGCO Electronic Diagnostic Tool (EDT) / WinEEM4 software, save the error log, and erase the fault codes.

3. 3

   Power cycle the ECU/tractor after erasing the log.

4. 4

   If the fault returns, perform a swap test with a known-good EEM4 controller to confirm hardware failure.

1. 1

   Disconnect battery

   Disconnect the tractor's battery.

2. 2

   Remove ECU

   Locate the EEM4 ECU on the side of the engine block, disconnect the wiring harnesses, and unbolt the module.

3. 3

   Install new ECU

   Install the new EEM4 ECU and reconnect the wiring harnesses.

4. 4

   Reconnect battery

   Reconnect the battery.

5. 5

   Connect diagnostic tool

   Connect the AGCO EDT (Electronic Diagnostic Tool) with WinEEM4 software to the tractor's diagnostic port.

6. 6

   Initiate ECU replacement

   Open the 'Configuration' menu in the software, select 'Engine ECU Replacement', and push the start button.

7. 7

   Flash and activate ECU

   Follow the on-screen prompts to flash the correct engine file and activate the EEM4 unit on the tractor. Note: OEM manuals explicitly warn against using a used EEM4 unit from another tractor, as it can permanently transfer incorrect engine hours to the machine.