DTC P0685: PCM Power Control Circuit/Internal Circuit Malfunction (V6)

NOTE: 

• Before you troubleshoot, review the general troubleshooting information - Refer to: How to Troubleshoot the Fuel and Emissions Systems (V6, Without Auto Idle Stop System) or How to Troubleshoot the Fuel and Emissions Systems (V6, With Auto Idle Stop System) .
• If the problem does not return after you clear the DTC, or if this DTC is stored intermittently, check for loose terminals at the IGP/FI MAIN RLY OUT line connectors before replacing the PCM.

DTC (PGM-FI)

1. Problem verification

   -1. Turn the vehicle to the ON mode.

   - 2. Clear the DTC with the HDS.

   - 3. Start the engine, and let it idle for 30 seconds.

   - 4. Turn the vehicle to the OFF (LOCK) mode.

   - 5. Turn the vehicle to the ON mode.

   - 6. Check for Pending or Confirmed DTCs with the HDS.

   DTC Description	Confirmed DTC	Pending DTC	Freeze Frame
   P0685 PCM Power Control Circuit/Internal Circuit Malfunction

   Is DTC P0685 indicated?

   YES 

   The failure is duplicated. Update the PCM if it does not have the latest software, or substitute a known-good PCM - Refer to: PCM Removal and Installation (With SH-AWD) or PCM Removal and Installation (Without SH-AWD) , then recheck. If DTC P0685 goes away and the PCM was updated, troubleshooting is complete. If DTC P0685 goes away and the PCM was substituted, replace the original PCM - Refer to: PCM Removal and Installation (With SH-AWD) or PCM Removal and Installation (Without SH-AWD) .

   NO 

   Intermittent failure. Check the following items. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.

   • Relay circuit board (PGM-FI main relay 1 circuit)
   • PGM-FI main fuse
   • Poor connections or loose terminals between the PCM and the under-hood fuse/relay box
   • Poor or loose PCM ground terminals and connections
   • Poor or loose 12 volt battery cables and connections
   • Check the 12 volt battery