Detection Condition

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

PCM monitors input voltage from right and left front HO2Ss when monitoring conditions are met. If input voltage from HO2S never exceeds 0.55 volt for 94 seconds, PCM determines HO2S circuit is not activated.

Monitoring Conditions:

Drive mode 3
Following conditions are to be met:
1. Engine speed is 1500 RPM or more
2. Engine coolant temperature is 158°F (70°C) or more

This is a Continuous Monitor (CM). MIL illuminates if PCM detects malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for same malfunction has been stored in PCM. PENDING CODE is available if PCM detects malfunction condition during first drive cycle. FREEZE FRAME DATA is available. DTC is stored in PCM memory.