New Holland 19742 – DCU: Main Relay Opens Too Early or Too Late

The main relay is not operating at the correct time, either opening too early or too late. This issue may occur before the EEPROM update and is related to the ECM/PCM power relay control circuit.

1. 1

   Main Relay

2. 2

   ECM/PCM Power Relay Control Circuit

1. 1

   Inspect

   Check the main relay for physical damage or signs of wear.

2. 2

   Test

   Test the ECM/PCM power relay control circuit for proper operation.

3. 3

   Verify

   Ensure the relay is functioning according to the service manual specifications.