New Holland 19742 – New Holland Dosing Control Unit Dcu: Main Relay Opens Too Early or Too Late

The main relay opens at an incorrect time, either too early or too late, which may result in improper power distribution to the system. This issue is related to the main relay shutting off before the EEPROM update is completed. The fault is associated with the ECM/PCM power relay control circuit.

1. 1

   Main relay operation timing

2. 2

   ECM/PCM power relay control circuit

3. 3

   Timing of EEPROM update relative to relay shutdown

1. 1

   Verify the timing of the main relay operation

   Check the timing of the main relay opening and closing to ensure it aligns with the expected sequence during system operation.

2. 2

   Inspect the ECM/PCM power relay control circuit

   Examine the wiring and connections related to the ECM/PCM power relay control circuit for any faults or disruptions.

3. 3

   Confirm the timing of the EEPROM update

   Ensure that the EEPROM update process is completed before the main relay shuts off to prevent premature shutdown.