DTC P0420 Catalyst System: Efficiency Below Threshold (Bank 1); DTC P0430 Catalyst System Efficiency Below Threshold: (Bank 2): DTC Detecting Condition
DTC DETECTING CONDITION CHART
| 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.
|
- Leakage in the exhaust system
- Faulty Catalyst Converter
- Faulty HO2S
- Faulty PCM
|
| Enable Conditions |
- Engine runtime ≤ 580
- Purge Concentration Learned
- Airflow in range (3 ~ 10 g/s)
- Closed throttle
- Coolant temp in range
- Barometer above 72 Kpa
- Max number of test attempts not exceeded
- Closed loop fueling
- Catalyst temperature in range
- Fuel learning in range
- Vehicle speed below 3kph(2mph)
- Auto trans in gear
- Long term fuel correction learned at idle
- Airflow timer reached limit
- Max idle time not exceeded
- Max number tests not complete
- Disabling faults not present
|
| Threshold value |
- Oxygen Storage Time < 1.5 sec.
|
| Diagnosis Time |
|
| MIL On Condition |
|