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Home >> Hyundai >> 2011 >> Accent GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Diagnosis (1 Of 2) >> DTC P0171: System Too Lean >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

DTC DETECTING CONDITION CHART

Item Detecting Condition Possible Cause
DTC Strategy
  • Long-term fuel trim limit
  • Poor connection
  • Related sensor
  • Intake air system
  • Fuel pressure
  • PCM
General Enable Conditions
  • Coolant temperature > 70 °C
  • Intake air temperature < 80 °C
  • Throttle angle < 60%
  • Closed loop control enabled
  • No transient control phase
  • No canister purge phase
Case 1 Enable Conditions
  • Engine load : 30 ~ 75 %
  • Air mass : 40 ~ 200 kg/h
Threshold Value
  • Correction value during driving > 1.23
Diagnostic Time
  • 30 sec
Case 2 Enable Conditions
  • Engine speed ≤ 920 RPM
  • Air mass ≤ 24 kg/h
Threshold Value
  • Correction value during idling > 8.5 %
Diagnostic Time
  • 20 sec
MIL ON Condition
  • 2 driving cycle
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