| DTC Strategy |
- Manipulates Air-fuel and stores the times it takes for the pre and post converter oxygen sensors to switch.
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- Catalyst Converter
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| Enable Conditions |
- No disabling faults present
- No instrumentation slews active
- Engine Runtime longer than 580 sec.
- Purge Concentration Learned
- Airflow between 3 g/s and 10 g/s
- Throttle closed less than 1.5%
- Coolant Temp. between 70°C (158 °F) and 120°C (248 °F)
- Ambient Temp. between -7°C (19.4 °F) and 105°C (221 °F)
- Barometer greater than 72 kPa
- Max number of test attempts less than 12
- Closed Loop
- Catalyst Temp. between 250°C (482 °F) and 950°C (1742 °F)
- Fuel learning completed
- Vehicle speed less than 3 kph (1.8 mph)
- Not air fuel ramping
- Max idle time (about 60 sec.) not exceeded
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| Threshold value |
- Oxygen Storage Time less than 1.2 sec.
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| Diagnosis Time |
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| MIL On Condition |
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