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DTC P0131:00: Notes

DTC P0131:00 (LF, L5) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0131:00 A/F sensor circuit low input
DETECTION CONDITION 
  • The PCM monitors the input voltage from the A/F sensor while the engine is running. If the following PCM terminal voltage is below specified, the PCM determines that the A/F sensor circuit voltage is low.
    • PCM terminal 2Z: 2 V 
    • PCM terminal 2AC: 1.2 V 
    • PCM terminal 2AD: 1.2 V 

    Diagnostic support note 

  • This is a continuous monitor (A/F sensor, 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 (Mode 2)/Snapshot data is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • A/F sensor connector or terminals malfunction
  • Short to ground in wiring harness between the following terminals:
    • A/F sensor terminal B-PCM terminal 2AD
    • A/F sensor terminal D-PCM terminal 2AC
    • A/F sensor terminal F-PCM terminal 2Z
  • PCM connector or terminals malfunction
  • A/F sensor malfunction
  • PCM malfunction
G06733838Courtesy of MAZDA MOTORS CORP.
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