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Home >> Hyundai >> 2021 >> Elantra N Line, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 35 (Engine Control System Diagnosis - 2.0L (Except HEV) (4 Of 6)) >> DTC P0456-00: Evaporative Emission System-Leak Detected (Very Small Leak) >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

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Item Detecting Condition Possible Cause
DTC Strategy
  • Monitoring Fuel Tank Pressure Trend after Evacuation
  1. Poor Connector Connection
  2. Air leak in PCSV hose
  3. Damaged or missing Fuel Filler Cap
  4. Faulty or damaged Fuel Filler Pipe
  5. Leaking, Disconnected or Plugged Fuel Vapor Line
  6. Faulty PCSV
  7. Faulty CCV
  8. Faulty canister
  9. Faulty fuel tank pressure sensor
Enable Condition
  • Minimum canister purge time is greater than 3s in case of canister load is less than 0.1 and relative purge flow higher than 3%
  • Minimum canister purge time is greater than 25s in case of canister load is greater or equal to 0.1 and relative purge flow higher than 3%
  • Engine speed is lower than 1500 RPM
  • Gas pedal value is lower than 0.01%(Pedal is not pushed at all)
  • Differential fuel tank pressure is between -1100 Pa and 420 Pa
  • Minimum drive time check done one time since engine start (Vehicle speed higher than 24 km/h (14 mph) during 60s)
  • Time since last EVAP monitoring test abortion is longer than 60s
  • Barometric pressure gradient is less than 7.5 kPa during uphill driving within 15 minutes
  • Battery voltage is greater than 10V
Threshold Value
  • Estimated leakage diameter more than to 0.03 in (0.81 mm)
Diagnostic Time
  • Idle period for 30 seconds (after all diagnostic operating conditions are met)
MIL ON Condition
  • 2 driving cycles