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Home >> Lexus >> 2009 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0351-U0001) - Circuit Tests) >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1); DTC P0430: Catalyst System Efficiency Below Threshold (Bank 2) >> Typical Enabling Conditions
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Typical Enabling Conditions

Monitor will run whenever these DTCs are not present P0010, P0020 (VVT Oil Control Valve)
P0011, P0021 (VVT System - Advance)
P0012, P0022 (VVT System - Retard)
P0016, P0018 (VVT System - Misalignment)
P0031, P0032, P0051, P0052 (Front Oxygen Sensor Heater)
P0037, P0038, P0057, P0058 (Rear Oxygen Sensor Heater)
P0133, P0134, P0153, P0154, P2195, P2196, P2197, P2198 (Front Oxygen Sensor)
P0136, P0137, P0138, P0139, P0156, P0157, P0158, P0159, P0606 (Rear Oxygen Sensor)
P0100, P0102, P0103 (Mass Air Flow Sensor)
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, P0174, P0175 (Fuel System)
P0301 - P0308 (Misfire)
P0335 (Crankshaft Position Sensor)
P1340 (Camshaft Position Sensor)
P0340, P0345 (VVT Sensor)
P0351 - P0358 (Igniter)
P0500 (Vehicle Speed Sensor)
Accumulated time that all of following conditions are met 20 seconds
Battery voltage 11 V or more
IAT -10°C (14°F) or more
Idle status OFF
MAF 13 to 40 g/sec.
Engine RPM Less than 4000 RPM
ECT 75°C (167°F) or more
Fuel system status Closed loop
Estimated catalyst temperature Both of the following conditions 1 and 2 are met
1. Up stream catalyst temperature 500 to 800°C (932 to 1472°F)
2. Down stream catalyst temperature 500 to 800°C (932 to 1472°F)