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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (Engine Control System Diagnosis - 2.0L (1 Of 3) (Except HEV)) >> DTC P0171: System Too Lean (Bank 1) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

WARNING: This page is about a different variant/trim than selected.
Item Detecting Condition Possible Cause
DTC Strategy
  • Monitor the fuel trim value
  1. Air leakage
  2. Improper fuel pressure
  3. PCV valve stuck
  4. Clogging of injector
Case 1 Enable Conditions
  • Engine Coolant Temperature (ECT) higher than 73°C (163.4°F)
  • Engine speed lower than 600 RPM
  • Mass Fuel Flow less than 0.032g/rev
Threshold Value
  • Idle Long term Fuel Trim greater than 0.008g/rev
Case 2 Enable Conditions
  • Engine Coolant Temperature (ECT) higher than 73°C (163.4°F)
  • Engine speed between 1150 RPM and 4000 RPM
  • Mass Fuel Flow between 0.014g/rev and 0.066g/rev
Threshold Value
  • Part Load Long term Fuel Trim greater than 25%
Diagnosis Time
  • 90 sec.
MIL On Condition
  • 2 Driving Cycles
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