Case IH P0685: ECM/PCM Power Relay Control Circuit Open

The ECM/PCM Power Relay Control Circuit is open, indicating a break in the electrical connection that controls the power relay for the engine control module.

1. 1

   ECM/PCM Power Relay Control Circuit wiring

2. 2

   ECM/PCM Power Relay connections

3. 3

   ECM/PCM Power Relay itself

1. 1

   Inspect

   Inspect the wiring of the ECM/PCM Power Relay Control Circuit for any damage, breaks, or loose connections.

2. 2

   Test

   Test the continuity of the ECM/PCM Power Relay Control Circuit using a multimeter to identify any open circuits.

3. 3

   Check

   Check the connections at the ECM/PCM Power Relay for corrosion, looseness, or damage.

4. 4

   Replace

   If a fault is found in the wiring or connections, repair or replace the affected section of the ECM/PCM Power Relay Control Circuit.