New Holland ENG 3743 – Engine Control Unit (ECU): EDC - Power stages, Injector: Diagnostic fault check to report the error in under voltage monitoring.

The Engine Control Unit (ECU) detects an internal under-voltage condition specifically affecting the injector power stages during engine startup. It essentially means the controller is not receiving or maintaining the minimum voltage required to properly fire the fuel injectors.

• F5C engines
• F5H engines
• L220 Skid Steer Loader
• Compact Track Loaders (CTL)
• T4 Tractor
• T5 Tractor
• T6 Tractor
• T7 Tractor

1. 1

   Inspect the battery for proper resting voltage and perform a load test

2. 2

   Clean and tighten all battery terminals and ground connections

3. 3

   Test the alternator and charging circuit to ensure the system is not experiencing high voltage fluctuations or failing to supply adequate voltage to the EDC

4. 4

   Connect the CNH Electronic Service Tool (EST) to verify if the fault code is currently active or stored as a historic event

1. 1

   Reflash the ECU

   Attempt to flash the Engine Control Unit (ECU) with the proper, most up-to-date data set/software using the CNH Electronic Service Tool (EST).

2. 2

   Evaluate

   Cycle the key and attempt a startup. If the fault code clears, the issue was a software corruption anomaly.

3. 3

   Replace the ECU

   If the fault code persists after a successful reflash, the internal injector power stage of the EDC has failed, and the ECU must be replaced.

4. 4

   Restore Parameters

   If the EDC is replaced, you must use the CNH Electronic Service Tool to perform the 'Restore Self Learning Parameters' procedure so the new module can sync with the engine and injectors.