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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 42 (Engine Control System Diagnosis - 2.0L (2 Of 3) (Except HEV)) >> DTC P0451: Evaporative Emission System-Pressure Sensor Range/Performance >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

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Item Detecting Condition Possible cause
Case 1 DTC Strategy
  • Signal Stuck in range
  1. Poor connection or damaged harness
  2. Faulty FTPS
  3. Faulty PCSV
  4. Fuel Cap missing
Enable Conditions
  • Vehicle Speed is greater than 50 km/h (31 mph) at least one time during driving cycle
  • Canister Purge Flow is greater than 0.42 g/sec (Uninterrupted 30 sec.)
  • Ambient Temperature is greater than -10°C (14°F)
  • Fuel level is less than 85%
  • Canister Load is less than 0.5
Threshold value
  • Fuel Tank Pressure Signal Variation is less than 30 mV
Diagnosis Time
  • 30 sec
Case 2 DTC Strategy
  • Signal High
Enable Conditions
  • Canister Purge Flow is greater than 0.42 g/sec (Uninterrupted 30 sec.)
  • Fuel level is less than 85%
  • Canister Load is less than 0.5
  • Ambient Temperature is greater than -10°C (14°F)
  • Coolant Temp. is greater than 50°C (122°F)
Threshold value
  • Fuel Tank Pressure is greater than 400 Pa
Diagnosis Time
  • 30 sec
Case 3 DTC Strategy
  • Signal Low
Enable Conditions
  • Ambient Temperature is greater than -10°C (14°F)
  • Coolant Temp. is greater than 50°C (122°F)
  • Fuel level is less than 85%
  • Canister Purge Valve closed
Threshold Value
  • Fuel Tank Pressure between -3500 Pa and -1100 Pa
Diagnosis Time
  • 40 sec
MIL On Condition
  • 2 Driving Cycles
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