New Holland 19741: Main Relay Opens Too Early or Too Late

The main relay opens at an incorrect time, either too early or too late, indicating an open circuit in the main relay or a high value in the relay power supply circuit. This issue is related to the ECM/PCM P0687 fault code.

1. 1

   Main relay

2. 2

   Relay power supply circuit

3. 3

   ECM/PCM

1. 1

   Inspect

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

2. 2

   Test

   Test the relay power supply circuit for high resistance or open connections.

3. 3

   Check

   Check the ECM/PCM for proper operation and communication with the main relay.