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Home >> Scion >> 2010 >> tC Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0010-P043E) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever the following DTCs are not present P0010 (Camshaft timing oil control valve assembly bank 1)
P0011 (VVT system bank 1 - advance)
P0012 (VVT system bank 1 - retard)
P0016 (VVT system bank 1 - misalignment)
P0031, P0032 (Air fuel ratio sensor heater)
P0037, P0038 (Heated oxygen sensor heater)
P0100, P0102, P0103 (Mass air flow meter sub-assembly)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient engine coolant temperature for closed loop)
P0136, P0137, P0138, P0139 (Heated oxygen sensor bank 1)
P0171, P0172 (Fuel system)
P0301, P0302, P0303, P0304 (Misfire)
P0335 (Crankshaft position sensor)
P0340 (VVT sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0500 (Vehicle speed sensor)
P0606 (Heated oxygen sensor - sensor 2)
P2195, P2196 (Air fuel ratio sensor - rationality)
P2237 (Air fuel ratio sensor - open)
P2238, P2252 (Air fuel ratio sensor - low impedance)
P2239, P2253 (Air fuel ratio sensor - high impedance)
P2A00 (Air fuel ratio sensor - slow response)
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 speed Less than 4000 RPM
A/F sensor 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 50 g/sec.
(b) Estimated front catalyst temperature 600 to 800°C (1112 to 1472°F)
(c) Estimated rear catalyst temperature 400 to 730°C (752 to 1346°F)
Shift position 3rd or higher: Manual transaxle
4th: Automatic transaxle