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Home >> Hyundai >> 2015 >> Sonata Eco >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 57 (Engine Control System Diagnosis (2 Of 2) (HEV)) >> DTC P1456: Evaporative Emission System-Leak Detected (Very Small Leak) >> General Information >> DTC Detecting Condition

General Information: DTC Detecting Condition

WARNING: This page is about a different variant/trim than selected.
Item Detecting Condition Possible Cause
DTC Strategy
  • Monitoring Fuel Tank Pressure Trend after generating underpressure in Tank
  1. Fuel filler cap damage or missing
  2. Faulty or damaged fuel filler pipe
  3. Leaking, disconnected or plugged fuel vapor lines
  4. Faulty CCV
  5. Faulty PCSV
  6. Faulty Canister
  7. Faulty Fuel Tank Pressure Sensor (FTPS)
Enable Conditions
  • Coolant temperature is higher than 37.5°C(99.5°F)
  • Ambient air temperature model is higher than -8.25°C(17.15°F)
  • Vehicle speed is slower than 12km/h(7.5mph)
  • Fuel level is lower than 85%
  • Ambient pressure model is higher than 75kPa
  • Battery voltage is higher than 10V
  • Accel. pedal is not pushed
  • Canister load is less than 1.5
  • Lambda control active and Lambda set-point = 1
Threshold Value
  • Leak diameter is larger than 0.42mm(0.016in)
Diagnostic Time
  • 30 sec. In idle when all enable conditions fulfilled
MIL On Condition
  • No MIL