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Home >> Lexus >> 2007 >> SC 430 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P0171 System Too Lean (Bank 1); DTC P0172 System Too Rich (Bank 1); DTC P0174 System Too Lean (Bank 2); DTC P0175 System Too Rich (Bank 2) >> Typical Malfunction Thresholds

Typical Malfunction Thresholds

TYPICAL MALFUNCTION THRESHOLDS

Purge-cut Executing
Either of following conditions (a) or (b) is met -
(a) Average between short-term fuel trim and long-term fuel trim 35% or more (varies with ECT)
(b) Average between short-term fuel trim and long-term fuel trim -35% or less (varies with ECT)
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