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Home >> Scion >> 2009 >> tC Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> Remove, Overhaul & Install >> 2AZ-FE Engine Control System >> SFI System >> DTC P0420 Catalyst System Efficiency Below Threshold (Bank 1) >> Typical Enabling Conditions
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Typical Enabling Conditions

TYPICAL ENABLING CONDITIONS CHART

Monitor runs whenever the following DTCs are not present None
Battery voltage 11 V or more
Intake air temperature -10°C (14°F) or more
Engine coolant temperature 75°C (167°F) or more
Atmospheric pressure 76 kPa (570 mmHg) or more
Idling OFF
Engine RPM Less than 4, 000 rpm
A/F sensor status Activated
Fuel system status Closed loop
Engine load 10 to 80%
All of the following conditions (a), (b) and (c) are met: -
(a) Mass air flow rate 2.5 to 40 g/sec.
(b) Estimated front catalyst temperature 500 to 800°C (932 to 1472°F)
(c) Estimated rear catalyst temperature 500 to 800°C (932 to 1472°F)
Rear HO2 sensor heater monitor Completed
Shift position 3rd or more: M/T 4th or more: A/T