Massey Ferguson 1043.04 – Engine Control Unit (ECU) / EEM4: Low Voltage Detected In The Engine Module (ECU)
Issue description
The engine management monitoring system has detected an internal failure regarding its 12-volt power supply (Internal 12V supply voltage below normal).
Applies to these machines
52 machines- 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
- 5709S through 5713SL
- 6612-6616
- 6712S-6718S
- 7614 through 7626
- 7714 through 7726S
- 5S Series
- 6S Series
- 7S Series
- 8000 Series
Check the cause
Measure the tractor's battery voltage and the alternator's charging output to ensure the 12V supply voltage reaching the ECU is within normal operating limits (diagnosing alternator or battery failure).
Connect the AGCO Electronic Diagnostic Tool (EDT), save the current error log, and then erase the fault codes.
Turn the ignition off for a minimum of 60 seconds to allow the ECU to power down completely, then restart the tractor.
Operate the tractor to see if the fault returns during the next driving cycle.
If the fault returns and external voltage is confirmed good, check the ECU operation by temporarily swapping it with another known-good EEM4 controller (diagnosing internal ECU hardware defect).
Repair steps
Order a New ECU
Obtain a new EEM4 spare part unit from AGCO parts. Caution: Using an old/used unit from another tractor can permanently add incorrect engine hours to the current tractor.
Deactivate the Old ECU
Using the AGCO EDT software, follow the prompts to deactivate the old EEM4 unit and save the machine's configuration data.
Remove the Old ECU
Disconnect the battery. Unplug the wiring harnesses from the defective EEM4 controller and unbolt it from its mounting bracket.
Install the New ECU
Bolt the new EEM4 unit into place and reconnect the wiring harnesses. Reconnect the battery.
Activate the New ECU
Connect the EDT, download the activation file, and follow the on-screen instructions to activate the new EEM4 unit.
Final Verification
Check the Injector Quantity Adjustment (IQA) codes and ensure no active service codes remain.
Parts you might need
(8)Engine Control Unit (ECU) / EEM4 Controller
0281020301Hardware types EEM4-H411 or EEM4-E401. Must be programmed and activated by a dealer using the AGCO EDT. Do not use a salvaged ECU.
Engine Control Unit (ECU) / EEM4 Controller
0281020170Hardware types EEM4-H411 or EEM4-E401. Must be programmed and activated by a dealer using the AGCO EDT. Do not use a salvaged ECU.
Engine Control Unit (ECU) / EEM4 Controller
837073357Hardware types EEM4-H411 or EEM4-E401. Must be programmed and activated by a dealer using the AGCO EDT. Do not use a salvaged ECU.
Alternator
4357844M412V, 120 Amp or 180 Amp depending on the specific tractor model and cab options. Only if diagnosed as the root cause.
Alternator
4357844M312V, 120 Amp or 180 Amp depending on the specific tractor model and cab options. Only if diagnosed as the root cause.
Alternator
4357844M212V, 120 Amp or 180 Amp depending on the specific tractor model and cab options. Only if diagnosed as the root cause.
Alternator
4357550M312V, 120 Amp or 180 Amp depending on the specific tractor model and cab options. Only if diagnosed as the root cause.
12V heavy-duty agricultural battery
Only if diagnosed as faulty.
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