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Table of Contents > DTC P0685: PCM Power Control Circuit/Internal Circuit Malfunction

Honda CR-V Programmed Fuel Injection (PGM-FI) system ➜ DTC P0685: PCM Power Control Circuit/Internal Circuit Malfunction

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1. Check for Pending or Confirmed DTCs with the HDS.  
DTC Description  
Confirmed DTC Pending DTC Freeze Frame  
P065A ACG NO CHARGING MALFUNCTION  
Is DTC P065A indicated?  
YES : Go to step 3.  
NO : Intermittent failure, the system is OK at this time. Check the alternator and the drive belt.  
3. Drive belt check:  
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1. INSPECT THE DRIVE BELT .  
Is the drive belt OK?  
YES : Repair or replace the alternator See ALTERNATOR OVERHAUL or ALTERNATOR  
REMOVAL AND INSTALLATION .  
NO : REPLACE THE DRIVE BELT .  
DTC P0685: PCM POWER CONTROL CIRCUIT/INTERNAL CIRCUIT  
MALFUNCTION  
Fig. 277: DTC Troubleshooting Flow Chart (P0685)  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
NOTE:  
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Before you troubleshoot, record all freeze data and any on-board  
snapshot, and review the general troubleshooting information See HOW  
TO TROUBLESHOOT THE A/T SYSTEM or HOW TO TROUBLESHOOT THE  
FUEL AND EMISSIONS SYSTEMS .  
If the problem doesn't return after you clear the DTC, or if this DTC is  
stored intermittently, check for loose terminals at the IGP line connectors  
before replacing the PCM.  
Confirmed  
DTC  
Pending  
DTC  
Freeze  
Frame  
DTC Description  
P0685 PCM POWER CONTROL CIRCUIT/INTERNAL  
CIRCUIT MALFUNCTION  
1. Problem verification:  
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1. Turn the ignition switch to ON (II).  
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2. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or  
HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS SYSTEMS .  
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3. Start the engine, and let it idle for 30 seconds.  
4. Turn the ignition switch to LOCK (0).  
5. Turn the ignition switch to ON (II).  
6. Check for Pending or Confirmed DTCs with the HDS.  
Confirmed  
DTC  
Pending  
DTC  
Freeze  
Frame  
DTC Description  
P0685 PCM POWER CONTROL CIRCUIT/INTERNAL  
CIRCUIT MALFUNCTION  
Is DTC P0685 indicated?  
YES : The failure is duplicated. Update the PCM See PCM UPDATE or PCM REMOVAL AND  
INSTALLATION if it does not have the latest software, or substitute a known-good PCM See PCM  
REMOVAL AND INSTALLATION or PCM UPDATE , then do the repair verification .  
NO : Intermittent failure. Check the following items:  
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PGM-FI main relay 1  
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 battery cables and connections  
Check the battery  
REPAIR VERIFICATION  
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1. Start the engine, and let it idle for 30 seconds.  
2. Turn the ignition switch to LOCK (0).  
3. Turn the ignition switch to ON (II).  
4. Check for Pending or Confirmed DTCs with the HDS.  
Confirmed  
DTC  
Pending  
DTC  
Freeze  
Frame  
DTC Description  
P0685 PCM POWER CONTROL CIRCUIT/INTERNAL  
CIRCUIT MALFUNCTION  
Is DTC P0685 indicated?  
YES : If the PCM was updated, substitute a known-good PCM See PCM REMOVAL AND  
INSTALLATION or PCM UPDATE , then recheck. If the PCM was substituted, go to step 1.  
NO : Troubleshooting is complete. If the PCM was substituted, replace the original PCM See PCM  
REMOVAL AND INSTALLATION or PCM UPDATE . If any other Pending or Confirmed DTCs are  
indicated, go to the indicated DTC's troubleshooting.  
DTC P06A8: INTERNAL VCC POWER MALFUNCTION  
Fig. 278: DTC Troubleshooting Flow Chart (P06A8)  
Courtesy of AMERICAN HONDA MOTOR CO., INC.  
NOTE:  
Before you troubleshoot, record all freeze data and any on-board snapshot, and  
review the general troubleshooting information See HOW TO TROUBLESHOOT  
THE A/T SYSTEM or HOW TO TROUBLESHOOT THE FUEL AND EMISSIONS  
SYSTEMS .  
DTC Description  
Confirmed DTC Pending DTC Freeze Frame  
P06A8 INTERNAL VCC POWER MALFUNCTION  
1. Problem verification:  
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1. Turn the ignition switch to ON (II).  
2. Clear the DTC with the HDS See HOW TO TROUBLESHOOT THE A/T SYSTEM or