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 HO2S (RF, LF) when the following monitoring conditions are met. If input voltage from suspected sensor remains 0.45 volt or less for 46 seconds, PCM determines there is no HO2S (RF, LF) inversion.

Monitoring Conditions:

Engine speed is 1500 RPM or more
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.