DTC P0131: Notes
DETECTION CONDITION AND POSSIBLE CAUSE (DTC P0131)
| DTC P0131 |
Front HO2S circuit low input |
| DETECTION CONDITION |
- The PCM monitors the input voltage from the front HO2S and the front HO2S output current when the engine is running. If the input voltage is less than 1.8 V
or the output current is less than -5 mA
, the PCM determines that the front HO2S circuit voltage is low.
Diagnostic support note
- This is a continuous monitor (HO2S).
- 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 malfunction
- Connector or terminal malfunction
- Open circuit in wiring harness between front HO2S terminal A and PCM terminal 2AD
- Short to ground in wiring harness between front HO2S terminal A and PCM terminal 2AD
- Open circuit in wiring harness between front HO2S terminal B and PCM terminal 2Z
- Short to ground in wiring harness between front HO2S terminal B and PCM terminal 2Z
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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