DTC P0685:00 [MZI-3.7]: Notes
WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION & POSSIBLE CAUSE
| DTC P0685:00 |
ECM/PCM power relay control circuit/open |
| DETECTION CONDITION |
- This DTC sets when the ignition switch position run circuit indicates the key is in the off, ACC, or LOCK position, and the amount of time the PCM remains powered through the PCM power relay exceeds a predetermined amount of time
|
| POSSIBLE CAUSE |
- Short to ground circuit between main relay terminal B and PCM terminal 1AZ
- Main relay malfunction
- PCM malfunction
|
 Courtesy of MAZDA MOTORS CORP.
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