P0685

P0685 - ECM/PCM Power Relay Control Circuit/open.

DTC Description
P0685 P0685 - ECM/PCM power relay control circuit/open.: Short circuit to V Batt.

Possible Causes:
1. Connectors C0604, C0578.
2. Open circuit C0578/9 (NG) - C0604/23 (NG).
3. Short circuit C0604/23 (NG) - Ground.
4. Engine compartment fusebox Fuse 2.
5. Main relay.
6. MS43 ECM.

Step 1-6: