DTC P0685: Notes
DTC P0685 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
| DTC P0685 |
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.
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| POSSIBLE CAUSE |
- Short to ground circuit between main relay No.1 terminal A and PCM terminal 1 BM
- Main relay No.1 malfunction
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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