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Home >> Toyota >> 2009 >> Matrix S, FWD, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 4 (Engine Control System (2ZR-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

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Fuel-trim 

TYPICAL MALFUNCTION THRESHOLDS CHART

Purge-cut Executing
Either of following conditions 1 or 2 met -
1. Average between short-term fuel trim and long-term fuel trim 35% or more (varies with engine coolant temperature)
2. Average between short-term fuel trim and long-term fuel trim -35% or less (varies with engine coolant temperature)