When Monitored
This diagnostic runs continuously when the following conditions are met:
- With the engine running.
- ECT greater than 60°C (140°F).
- Vehicle speed above 96 km/h (60 mph).
- Catalytic converter temperature greater than 600° C (1112° F).
- Downstream oxygen sensor in a rich state.
- During a decel fuel shutoff event, the downstream oxygen sensor should switch from rich to lean within a specific time.