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Home >> Toyota >> 2014 >> Sienna Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (Diagnostic Codes (P0101-P0390)) >> 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) [08/2013 - ] >> Typical Malfunction Thresholds
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Typical Malfunction Thresholds

FUEL-TRIM

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)