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Home >> Toyota >> 2005 >> Matrix Base, FWD, Automatic >> Repair and Diagnosis (Single Page) >> External Pages >> Different variant/trim >> Section 2 (Engine Control System (SFI) (1ZZ-FE(4WD)) - Diagnostics) >> SFI System (1ZZ-FE (4WD)) >> DTC P0171, P0172: System Too Lean/Rich (Bank 1) >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

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Fuel-trim: 

TYPICAL MALFUNCTION THRESHOLDS CHART

Duration of purge-cut (purge VSV: OFF) 9 seconds
Average fuel-trim (long-term +short-term) learning value (varies with engine coolant temperature [ECT]) 35 % or more at 80°C (176°F) of ECT, or -35 % or less at 80°C (176°F) of ECT