DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430 Catalyst System Efficiency Below Threshold (Bank 2): DTC Detecting Condition

DTC DETECTING CONDITION

Item	Detecting Condition	Possible cause
DTC Strategy	Manipulates Airfuel and stores the times it takes for the pre and post converter oxygen sensors to switch.	Catalyst Converter
Enable Conditions	Engine Runtime ≥ 580 sec. Purge Concentration Learned 3 g/s ≤ Airflow ≤ 10 g/s Throttle closed ≤ 1.5% 70°C (158°F) Coolant Temp. ≤ 120°C (248°F) -7°C (19.4°F) ≤ Ambient Temp. ≤ 105°C (221°F) Barometer ≥ 72 kPa Max number of test attempts ≤ 12 Closed Loop 250°C (482°F) ≤ Catalyst Temp. ≤ 950°C (1742°F) Fuel learning completed Vehicle speed ≤ 3 kph (1.8 mph) Not airfuel ramping Max idle time ( about 60 sec.) not exceeded No disabling faults present No instrumentation slews active
Threshold value	Oxygen Storage Time < 3.25 sec.
Diagnosis Time	15 sec.
MIL On Condition	1 Driving cycle