Detection Condition

PCM monitors input voltage from rear HO2S when following monitoring conditions are met. If input voltage from rear HO2S never exceeds 0.55 volt for 30 seconds, PCM determines sensor circuit is not activated.

Monitoring Conditions:

• Engine coolant temperature is more than 176°F (80°C)
• Engine speed is more than 1500 RPM
• Mode 3 - HO2S Heater, HO2S & TWC Repair Verification Drive Mode

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.