LEMON Manuals
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2017
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LX 570
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Repair and Diagnosis
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Engine Performance
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Testing & Diagnosis
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Engine Control System - Diagnostic Codes (2 Of 7)
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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) [08/2018 - 08/2019]
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Typical Malfunction Thresholds
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Typical Malfunction Thresholds
Purge-cut
Executing
Either of following 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)