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Home >> Scion >> 2012 >> iQ >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0365-P1603)) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Typical Enabling Conditions

Typical Enabling Conditions

Monitor runs whenever following DTCs not stored P0010 (Camshaft Timing Oil Control Valve)
P0011 (VVT System - Advance)
P0012 (VVT System - Retard)
P0016 (VVT System - Misalignment)
P0013 (Exhaust Camshaft Timing Oil Control Valve)
P0014 (Exhaust VVT System - Advance)
P0015 (Exhaust VVT System - Retard)
P0017 (Exhaust VVT System - Misalignment)
P0031, P0032, P101D (Air Fuel Ratio Sensor Heater)
P0037, P0038, P102D (Heated Oxygen Sensor Heater)
P2195, P2196, P2237, P2238, P2239, P2252, P2253, P2A00 (Air Fuel Ratio Sensor)
P0136, P0137, P0138, P0139, P0607 (Rear Oxygen Sensor)
P0102, P0103 (Mass Air Flow Meter)
P0115, P0117, P0118 (Engine Coolant Temperature Sensor)
P0125 (Insufficient Coolant Temperature for Closed Loop Fuel Control)
P0120, P0121, P0122, P0123, P0220, P0222, P0223, P2135 (Throttle Position Sensor)
P0171, P0172 (Fuel System)
P0301 - P0304 (Misfire)
P0335 (Crankshaft Position Sensor)
P0340, P0342, P0343 (Camshaft Position Sensor)
P0365, P0367, P0368 (Exhaust Camshaft Position Sensor)
P0351 - P0354 (Igniter)
P0500 (Vehicle Speed Sensor)
Battery voltage 11 V or higher
Intake air temperature -10°C (14°F) or higher
Engine coolant temperature 75°C (167°F) or higher
Atmospheric pressure 76 kPa (570 mmHg) or higher
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) 700 to 880°C (1292 to 1616°F)
3. Rear catalyst temperature (estimated) 400°C (752°F) or more
Shift position 3rd or higher