New Holland 19741 – 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, indicating a potential open circuit in the main relay. This may affect the power relay control circuit of the ECM/PCM.

1. 1

   Main relay

2. 2

   Main relay open circuit

3. 3

   ECM/PCM power relay control circuit

1. 1

   Inspect

   Inspect the main relay for signs of damage or wear.

2. 2

   Test

   Test the main relay for proper operation and continuity.

3. 3

   Check

   Check the ECM/PCM power relay control circuit for any open connections or faults.