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Home >> Subaru >> 2009 >> Outback Limited >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Diagnostic Trouble Code (DTC) Detecting Criteria (H4SO) >> Diagnostic Trouble Code (DTC) Detecting Criteria >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> Enable Condition

Enable Condition

ENABLE CONDITION REFERENCE

Secondary Parameters Enable Conditions
Battery voltage ≥ 10.9 V
Atmospheric pressure ≥ 75 kPa (563 mmHg, 22.2 inHg)
Engine coolant temperature ≥ 70°C(158°F)
Estimated catalyst temperature ≥ 600 °C (1112 °F) (AT model)
≥ 585 °C (1085 °F) (MT model)
Misfire detection every 200 rotations < 5 time(s)
Learning value of evaporation gas density < 0.2
Sub feedback In operation
Evaporative system diagnosis Not in operation
Time of difference (< 0.10) between actual lambda and target lambda ≥ 1000 ms
Vehicle speed > 70 km/h (43.5 MPH)
Amount of intake air ≥ 10 g/s (0.35 oz./s)
and
< 40g/s (1.41 oz./s)
Engine load change every 0.5 engine speed. < 0.02 g/rev (0 oz./rev)
Rear oxygen output change from 660 mV or less to 660 mV or more Experienced after fuel cut
Elapsed time after starting the engine ≥ 205s
Purge execution calculated time ≥ 0s