DTC P0031-00: A/F Sensor Heater Control System: Low Input
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P0031:00 (PCM - VIN Y) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
A/F sensor heater control system: Low input |
| Detection condition |
- When the PCM controls the A/F sensor heater, the voltage input to the PCM is too low.
|
| Fail-safe |
- Stops fuel feedback control.
|
| Possible cause |
- Malfunction in wiring harness (including connector/terminal) between sub relay and A/F sensor (see CIRCUIT INSPECTION
.) (see CONNECTOR INSPECTION
.)
- Malfunction in wiring harness (including connector/terminal) between A/F sensor and PCM (see CIRCUIT INSPECTION
.) (see CONNECTOR INSPECTION
.)
- A/F sensor malfunction (A/F sensor heater malfunction) (Refer to AIR FUEL RATIO (A/F) SENSOR INSPECTION (VIN Y)
in the service information.)
- PCM malfunction (Refer to applicable PCM REMOVAL/INSTALLATION (VIN Y)
in the service information.)
|
| Repeatability verification procedure |
- Clear the DTC recorded in the memory. (see CLEARING DTC
.)
- Perform the KOER self test. (See DTC INSPECTION
.)
|
 Courtesy of MAZDA MOTORS CORP.
|
| 1 |
Battery |
| 2 |
Sub relay |
| 3 |
A/F sensor (A/F sensor heater) |
| 4 |
PCM |