Honda Accord 2008 Manual page 468

07/11/02 09:05:54 61TA0000_110_0149
DTC P0685: ECM/PCM Power Control Circuit/
Internal Circuit Malfunction
NOTE:
• Before you troubleshoot, record all freeze data and
any on-board snapshot, and review the general
troubleshooting information (see page 11-3).
• If the problem doesn't return after you clear the DTC,
or it this DTC is stored intermittently, check for loose
terminals at the IGP line connectors before replacing
the ECM/PCM.
1. Turn the ignition switch to ON (II).
2. Clear the DTC with the HDS.
3. Start the engine, then let it idle for 30 seconds.
4. Turn the ignition switch to LOCK (0).
5. Start the engine, then let it idle for 30 seconds.
6. Turn the ignition switch to LOCK (0).
7. Turn the ignition switch to ON (II).
8. Check for Temporary DTCs or DTCs with the HDS.
Is DT C P0685 indicated?
YES − Go to step 9.
−
NO Intermittent failure, the system is OK at this
time.
9. Update the ECM/PCM if it does not have the latest
software (see page 11-231), or substitute a known-
good ECM/PCM (see page 11-7).
10. Start the engine, then let it idle for 30 seconds.
11. Turn the ignition switch to LOCK (0).
12. Start the engine, then let it idle for 30 seconds.
13. Turn the ignition switch to LOCK (0).
14. Turn the ignition switch to ON (II).
15. Check for Temporary DTCs or DTCs with the HDS.
Is DT C P0685 indicated?
−
YES If the ECM/PCM was updated, substitute a
known-good ECM/PCM (see page 11-7), then go to
step 10. If the ECM/PCM was substituted, go to step
1.
NO − If the ECM/PCM was updated, troubleshooting
is complete. If the ECM/PCM was substituted,
replace the original ECM/PCM (see page 11-232). If
any other Temporary DTCs or DTCs are indicated,
go to the indicated DTC's troubleshooting.
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11-149