LEMON Manuals
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Toyota
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2012
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4Runner Trail
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Repair and Diagnosis
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Engine Performance
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System
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Engine Control System (Diagnostic Codes (P0010-P0327))
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SFI System
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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)
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Typical Malfunction Thresholds
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Typical Malfunction Thresholds
EVAP purge-cut
Executing
Either of conditions 1 or 2 met
-
1. Average of short-term fuel trim and long-term fuel trim
35% or more (varies with ECT)
2. Average of short-term fuel trim and long-term fuel trim
-35% or less (varies with ECT)