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Home >> Scion >> 2005 >> xA Automatic >> Repair and Diagnosis >> Engine Performance >> SFI System >> DTC P0420: Catalyst System Efficiency Below Threshold (Bank 1) >> Typical Enabling Conditions

Typical Enabling Conditions

TYPICAL ENABLING CONDITIONS

Monitor runs whenever these DTCs not present See LIST OF DISABLE A MONITOR 
Accumulated time that following conditions met 20 seconds
Battery voltage 11 V or more
IAT -10°C (14°F) or more
Idle OFF
MAF 8 to 25 gm/sec
Engine RPM Less than 4,000 rpm
ECT 75°C (167°F) or more
Estimated TWC temperature Up stream catalyst: 600 to 750°C (1,112 to 1,382°F) Down stream catalyst: 600 to 750°C (1,112 to 1,382°F)
Fuel system status Closed loop