Component Inspection
- Monitor the Catalyst Converter
- Clear DTC.
- Start the engine and warm it up until the radiator fan comes on (more than at least 10 minutes).
- Drive at a steady speed between 45-55 mph (72-88 km/h) for 30 seconds.
- Stop and then maintain idle state for 120 seconds in D-position.
- Repeat Step 3 once again.
- Stop and then keep it in idle state (D-positon) for 120 seconds.
- Repeat Step 3 once again.
- Stop and then maintain idle state for 120 seconds in D-position.
- IG "OFF"
- Repeat Steps 3 through 9 three times.
- Check if catalyst monitoring readiness is complete. so, if the readiness is incomplete, repeat Steps 2 through 10.
- Does the scan tool show DTC P0420?
YES
- Substitute with a known - good Catalyst Converter and check the signal waveform of HO2S for proper operation. If the problem is corrected, go to "VERIFICATION OF VEHICLE REPAIR " procedure.
NO