DTC P0031: Notes
DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0031)
| DTC P0031 |
Front HO2S heater circuit low input |
| DETECTION CONDITION |
- The PCM monitors the front HO2S heater control voltage when the PCM turns the front HO2S heater off. If the control voltage exceeds 50% of the battery voltage, the PCM determines that the front HO2S heater control circuit voltage is low.
Diagnostic support note
- This is a continuous monitor (HO2S heater).
- The MIL illuminates if the PCM detects the above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.
- PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.
- FREEZE FRAME DATA is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Front HO2S heater malfunction
- Connector or terminal malfunction
- Short to power supply in wiring harness between front HO2S terminal D and PCM terminal 2BG
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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