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Home >> Scion >> 2006 >> tC Automatic >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System (2AZ-FE) >> SFI System >> DTC P0171 System Too Lean (Bank 1) : DTC P0172 System Too Rich (Bank 1) >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

TYPICAL MALFUNCTION THRESHOLDS

EVAP purge-cut Executing
When either condition below is met: -
Average between short-term fuel trim and long-term fuel trim 38 % or more (varies with ECT)
Average between short-term fuel trim and long-term fuel trim -32 % or less (varies with ECT)