Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Mazda >> 2007 >> 3 i, 2.0 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic (Engine Control System LF, L3) (2 Of 5) >> DTC P0043 >> California Emission Regulation Applicable Model >> Notes

California Emission Regulation Applicable Model: Notes

DTC P0043 (LF, L3) DETECTION CONDITION AND POSSIBLE CAUSES

DTC P0043 Rear HO2S heater circuit low input
DETECTION CONDITION 
  • The PCM monitors the rear HO2S heater control voltage when the PCM turns the rear HO2S heater off. If the control voltage exceeds 25%  of the battery voltage, the PCM determines that the rear 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 
  • Rear HO2S heater malfunction
  • Connector or terminal malfunction
  • Short to power supply in wiring harness between rear HO2S terminal D and PCM terminal 2BE
  • PCM malfunction
G04954274Courtesy of MAZDA MOTORS CORP.
scientia non olet · About Mike's Workshop Manuals