DTC P0685-00: Main Relay Control Circuit Open
P0685: 00 (PCM (H3T)) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Main relay control circuit open |
| Detection condition |
- The period of time in which the PCM power supply remains on after the ignition is switched off is not within the specified time.
|
| Fail-safe |
|
| Possible cause |
- Main relay malfunction (Refer to [RELAY INSPECTION
] in service information).
- Malfunction in wiring harness (including connector/terminal) between main relay and PCM (See CIRCUIT INSPECTION
.) (See CONNECTOR INSPECTION
.)
- Malfunction in wiring harness (including connector/terminal) between PCM and body ground (See CIRCUIT INSPECTION
.) (See CONNECTOR INSPECTION
.)
- PCM malfunction (Refer to [PCM REMOVAL/INSTALLATION
] in service information).
|
| Repeatability verification procedure |
- Clear the DTC recorded in the memory. (See CLEARING DTC
.)
- Start the engine and warm it up completely.
|
 Courtesy of MAZDA MOTORS CORP.
|
| 1 |
Battery |
| 2 |
Main relay |
| 3 |
PCM |