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Home >> Lexus >> 2005 >> SC 430 >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> SFI System - Diagnostics >> DTC P0171, P0172, P0174, P0175: System Too Lean/Rich (Fuel Trim) (Bank 1), System Too Lean/Rich (Bank 2) >> Typical Enabling Conditions

Typical Enabling Conditions

TYPICAL ENABLING CONDITIONS

Monitor will run whenever these DTCs are not present See LIST OF DISABLE A MONITOR 
Battery voltage 11 V or more
Fuel system status Closed loop (for 13 seconds or more)
Throttle position learning Completed
Warm-up condition to enable air fuel ratio learning control Conditions are met
Either of following conditions (a) or (b) is met -
(a) Engine RPM Less than 1,000 rpm
(b) Intake air amount per revolution 0.28 g/rev or more