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Home >> Toyota >> 2021 >> C-HR LE >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System (W/ Canister Pump) - Diagnostic Codes (P0335-P0604) >> SFI SYSTEM (w/ Canister Pump Module) >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) [02/2017 - 08/2020] >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor runs whenever the following DTCs are not stored 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)
P014C, P014D, P015A
P015B
P2195, P2196
P0102, P0103 (Mass air flow meter)
P0107, P0108 (Manifold absolute pressure)
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, P013A, P0607 (Heated oxygen sensor)
P2237, P2238, P2239, P2252, P2253, P2A00 (Air fuel ratio sensor)
P0171, P0172 (Fuel system)
P0300, P0301, P0302, P0303, P0304 (Misfire)
P0335 (Crankshaft position sensor)
P0340, P0342, P0343 (Camshaft position sensor)
P0351, P0352, P0353, P0354 (Igniter)
P0365, P0367, P0368 (Exhaust camshaft position sensor)
P0500 (Vehicle speed sensor)
P219A, P219C, P219D, P219E, P219F (Air-fuel ratio imbalance)
P264A, P2646, P2647, P1055, P10A0, P2648, P2649, P1049, P104A, U011B (Rocker arm control module)
Response rate during fuel cut from rich condition Completed
Battery voltage 11 V or higher
Intake air temperature -10°C (14°F) or higher
Engine coolant temperature 73°C (163.4°F) or higher
Atmospheric pressure 76 kPa (abs) [570 mmHg (abs)] or higher
Idling OFF
Engine speed less than 4000 RPM
Air fuel ratio sensor status Activated
Fuel system status Closed loop
Engine load 10% or higher, and less than 80%
All of the following conditions are met 1, 2 and 3
1. Mass air flow 2.5 gm/sec or more, and less than 40 gm/sec
2. Front catalyst temperature (estimated) 620°C (1148°F) or higher, and less than 840°C (1544°F)
3. Rear catalyst temperature (estimated) 480°C (896°F) or higher, and less than 760°C (1400°F)
Shift position 3rd or higher