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Home >> Hyundai >> 2018 >> Kona Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 149 (Engine Control System Diagnosis - 2.0L (1 Of 3)) >> DTC P0171-00: System Too Lean (Bank 1) >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

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Item Detecting Condition Possible Cause
Main Action
  • Monitoring the deviation of fuel trim (long term)
  1. Air leakage
  2. Improper fuel pressure
  3. PCV valve stuck
  4. Clogging of injector
  5. Fuel system
Prerequisite Condition
  • Engine Coolant Temperature (ECT) is higher than 60° (140°F).
  • Long term idle fuel trim activation with
    • Engine speed is lower than 900 RPM
    • Mass Fuel Flow (MFF) is smaller than 0.032 g/rev.
  • Long term partial load fuel trim activation with
    • Engine speed is between 1150 RPM and 4000 RPM.
    • Mass Fuel Flow (MFF) is bigger than 0.020 g/rev.
Threshold Value
  • Long term idle fuel trim is higher than or equal to 0.008 g/rev or
  • Long term fuel trim partial load is bigger than or equal to 25%.
Diagnostic Time
  • 90 Seconds
MIL-On Condition
  • 3rd Driving Cycle
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