Mazda 3 Workshop Manual page 265

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
POSSIBLE CAUSE
Diagnostic procedure
STEP
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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 first drive cycle.
• FREEZE FRAME DATA is available.
• The DTC is stored in the PCM memory.
• Rear HO2S malfunction
• Open circuit in wiring harness between the main relay and rear HO2S
terminal C
• Open circuit in wiring harness between rear HO2S terminal D and PCM
terminal 2C
• Short to ground in wiring harness between rear HO2S terminal D and PCM
terminal 2C
• Poor connection at the rear HO2S or the PCM connector
• PCM malfunction
INSPECTION
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ACTION
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