New Holland ENG 3739 – EDC (Electronic Diesel Control): EDC - Power stages, Injector: Loss of synchronization sending bytes to the MM from CPU.

This is an internal hardware/processing error within the engine's computer. It indicates that during the ECU startup sequence, the Central Processing Unit (CPU) lost synchronization while attempting to communicate with the Memory Module (MM) regarding the injector power stages.

• L223
• L316
• L318
• L320
• W50C
• W60C
• W70C
• W80C
• CR9090
• CX8080 Elevation
• CX8090 Elevation

1. 1

   Verify battery voltage during startup, as severe undervoltage can cause processor initialization errors

2. 2

   Check for accompanying injector circuit codes (e.g., 3740, 3741) or ROM-memory codes. If 3739 is isolated, it confirms an internal ECU processing fault

3. 3

   Verify if the ECU software is corrupted before condemning the hardware

1. 1

   Connect the CNH Electronic Service Tool (EST) to the machine's diagnostic port.

   Connect the CNH Electronic Service Tool (EST) to the machine's diagnostic port.

2. 2

   Try to re-flash the EDC (Engine Controller) correctly with the proper, most up-to-date software data set.

   Attempt to Reprogram: Try to re-flash the EDC (Engine Controller) correctly with the proper, most up-to-date software data set.

3. 3

   Cycle the key and re-check for the active fault code.

   Cycle the key and re-check for the active fault code.

4. 4

   If the error persists after flashing, the EDC has suffered a permanent internal hardware failure and must be replaced.

   Replace Module: If the error persists after flashing, the EDC has suffered a permanent internal hardware failure and must be replaced.

5. 5

   Install the new Engine Controller.

   Install the new Engine Controller.

6. 6

   Using the CNH EST, follow the appropriate service tool procedure to restore the engine's self-learning parameters.

   Restore Parameters: Using the CNH EST, follow the appropriate service tool procedure to restore the engine's self-learning parameters.

7. 7

   Ensure the specific injector trim codes (IQA codes) are written into the new controller's memory so the power stages operate the injectors correctly.

   Write Injector Codes: Ensure the specific injector trim codes (IQA codes) are written into the new controller's memory so the power stages operate the injectors correctly.