Case IH P0685: ECM/PCM Power Relay Fault

The fault code indicates an issue with the ECM/PCM Power Relay. This component is responsible for providing power to the engine control module. A failure in this relay can lead to improper operation or communication with the control system.

1. 1

   ECM/PCM Power Relay

2. 2

   Power supply to the relay

3. 3

   Connections to the relay

1. 1

   Inspect

   Check the ECM/PCM Power Relay for physical damage or signs of overheating.

2. 2

   Test

   Verify the power supply to the ECM/PCM Power Relay using a multimeter.

3. 3

   Check

   Inspect the electrical connections to the ECM/PCM Power Relay for looseness or corrosion.