Component Inspection
■ Monitor the Catalyst Converter
1.

Clear DTC.

2.

Start the engine and warm it up until the radiator fan comes on.( more than at least 10 minutes).

3.

Drive at a steady speed between 45-55 mph(72-88 km/h) for 30 seconds.

4.

Stop and then maintain idle state for 120 seconds in D-position.

5.

Repeat step 3 once again.

6.

Stop and then keep it in idle state( D-positon) for 120 seconds.

7.

Repeat step 3 once again.

8.

Stop and then maintain idle state for 120 seconds in D-position.

9.

IG "OFF".

10.

Repeat steps 3 through 9 three times.

11.

Check if catalyst monitoring readiness is complete. so, if the readiness is incomplete, repeat steps 2 through 10.

12.

Does the scan tool show DTC P0420 ?

▶ 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.

▶ It was intermittent failure.

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