Mazda 3 Workshop Manual page 106

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
POSSIBLE CAUSE
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0.55 V for 120 s or more, the PCM determines that sensor circuit is not
activated.
MONITORING CONDITIONS
- HO2S, HO2S heater and TWC repair verification drive mode
- Following conditions are met:
• Engine speed is 1,500 rpm or more.
• Engine coolant temperature is 70 °C {158 °F} or more.
• Within feed-back range
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.
• Front HO2S deterioration
• Front HO2S heater malfunction
• Leakage in exhaust system
• Open circuit in wiring harness between front HO2S terminal A and PCM
terminal 2AI
• Short to GND in wiring harness between front HO2S terminal A and PCM
terminal 2AI
• Insufficient compression
• Engine malfunction
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