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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 39 (Engine Control System Diagnosis - 1.6L (2 Of 3) (Except HEV)) >> DTC P0456: Evaporative Emission System-Leak Detected (Very Small Leak) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

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Item Detecting Condition Possible Cause
DTC Strategy
  • Monitor the vacuum decay slope
  1. Leakage in each hose/fuel filler pipe
  2. Leakage in CCV/Canister/Fuel tank/Fuel Filler Cap
Enable Conditions
  • Canister Close Valve close
  • Canister Purge Valve close
  • Time after engine starts has passed 130 second.
  • ECT at start is between 0°C (32°F) and 35°C (95°F).
  • The difference between ECT at start and IAT is less than 9.8°C (49.6°F).
  • IAT temp is between 0°C (32°F) and 40°C (104°F).
  • BARO is higher than 74.5 kPa
  • Fuel level is between 15% and 85%
  • Duration of tank ventilation is higher than 10 sec
  • Fuel System Status Closed loop
  • Accel. Pedal = 0%
  • Vehicle speed = 0mph
  • Disable conditions: P0300 ~ P0304
Threshold Value
  • FTP gradient is higher than 20~25 Pa/sec
Diagnostic Time
  • 25 sec
MIL ON Condition
  • 2 driving cycle