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Home >> Scion >> 2012 >> xD Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0420-P1605)) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever following DTCs not present P0010 (Camshaft timing oil control valve)
P0011 (VVT system - advance)
P0012 (VVT system - retard)
P0013 (Exhaust camshaft timing oil control valve)
P0014 (Exhaust VVT system - advance)
P0015 (Exhaust VVT system - retard)
P0016 (VVT system - misalignment)
P0017 (Exhaust VVT system - misalignment)
P0031, P0032, P101D (Air fuel ratio sensor heater)
P0037, P0038, P102D (Heated oxygen sensor heater)
P0102, P0103 (Mass air flow meter)
P0115, P0117, P0118 (Engine coolant temperature sensor)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle position sensor)
P0125 (Insufficient coolant temperature for closed loop fuel control)
P0136, P0137, P0138, P0139, P0607 (Heated oxygen sensor)
P0171, P0172 (Fuel system)
P0301, P0302, P0303, P0304 (Misfire)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343 (Camshaft position sensor)
P0365, P0367, P0368 (Exhaust camshaft position sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0500 (Vehicle speed sensor)
P2195, P2196, P2237, P2238, P2239, P2252, P2253, P2A00 (Air fuel ratio sensor)
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 coefficient 76 kPa(abs) [570 mmHg(abs)] or more
Idling OFF
Engine speed Less than 4000 rpm
Air fuel ratio sensor status Activated
Fuel system status Closed loop
Engine load 10 to 80%
All of the following conditions are met Condition 1, 2 and 3
1. Mass air flow rate 2.5 to 40 gm/sec
2. Front catalyst temperature (estimated) 660 to 840°C (1220 to 1544°F): Automatic Transaxle
630 to 840°C (1166 to 1544°F): Manual Transaxle
3. Rear catalyst temperature (estimated) 400 to 760°C (752 to 1400°F)
Shift position 3rd or more: Automatic Transaxle
4th or more: Manual Transaxle