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California Emission Regulation Applicable Model: Notes

DTC P0037 (LF, L3) DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0037 Middle HO2S heater circuit low input
DETECTION CONDITION 
  • The PCM monitors the middle HO2S heater control voltage when the PCM turns the middle HO2S heater off. If the control voltage exceeds 25%  of the battery voltage, the PCM determines that the middle 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.
POSSIBLE CAUSE 
  • Middle HO2S heater malfunction
  • Connector or terminal malfunction
  • Short to power supply in wiring harness between middle HO2S terminal D and PCM terminal 2BF
  • PCM malfunction
G04954270Courtesy of MAZDA MOTORS CORP.
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