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DTC P0038 [LF]: Notes

DTC P0038 (LF) DETECTION CONDITION AND POSSIBLE CAUSE

DTC P0038 HO2S heater circuit high input
DETECTION CONDITION 
  • The PCM monitors the HO2S heater control voltage when the PCM turns the HO2S heater off. If the control voltage exceeds 25% of the battery voltage, the PCM determines that the HO2S heater control circuit voltage is high.

Diagnostic support note 
  • This is a continuous monitor (A/F sensor heater, 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 (Mode 2/Mode 12) is available.
  • The DTC is stored in the PCM memory.
POSSIBLE CAUSE 
  • HO2S connector or terminals malfunction
  • HO2S heater malfunction
  • PCM connector or terminals malfunction
  • Short to power supply in wiring harness between HO2S terminal D and PCM terminal 2BE
  • PCM malfunction
G06149958Courtesy of MAZDA MOTORS CORP.
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