New Holland P0685: ECM/PCM Power Relay Control Circuit Open

The fault code indicates an open circuit in the control circuit for the ECM/PCM power relay. This prevents the relay from receiving the necessary signal to function properly, which can affect the operation of the engine control system.

1. 1

   The wiring and connections associated with the ECM/PCM power relay control circuit

2. 2

   The ECM/PCM power relay itself for proper operation

3. 3

   The integrity of the control circuit for any breaks or disconnections

1. 1

   Inspect

   Inspect the wiring and connections related to the ECM/PCM power relay control circuit for damage, corrosion, or loose connections.

2. 2

   Test

   Test the ECM/PCM power relay to ensure it is functioning as intended.

3. 3

   Repair

   Repair or replace any damaged wiring, connectors, or the ECM/PCM power relay as needed.