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Home >> Scion >> 2006 >> xA Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (1NZ-FE) >> SFI System >> DTC P0171 System Too Lean (Bank 1); DTC P0172 System Too Rich (Bank 1) >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

All: 

TYPICAL MALFUNCTION THRESHOLDS

EVAP purge-cut Executing

Fuel trim Lean: 

FUEL TRIM LEAN SPECIFICATION

Average fuel trim learning value 35% or more (varies with engine coolant temperature [ECT])

Fuel trim Rich: 

FUEL TRIM RICH SPECIFICATION

Average fuel trim learning value -35% or less (varies with ECT)