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Home >> Lexus >> 2010 >> GS 350 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 168 (Engine Control System (DTCS P0420 - U0101 & Circuit Tests)) >> SFI System >> DTC P0455: Evaporative Emission Control System Leak Detected (Gross Leak); DTC P0456: Evaporative Emission Control System Leak Detected (Very Small Leak) >> Typical Enabling Conditions

Typical Enabling Conditions

WARNING: This page is about a different car, the 2009 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.
Monitor runs whenever following DTCs are not present None
EVAP key-off monitor runs when all of following conditions are met: -
Atmospheric pressure 70 to 110 kPa (525 to 825 mmHg)
Battery voltage 10.5 V or more
Vehicle speed Less than 2.5 mph (4 km/h)
Engine switch OFF
Time after key off 5, 7 or 9.5 hours
Canister pressure sensor malfunction (P0450, P0452 and P0453) Not detected
Purge VSV Not operated by scan tool
Vent valve Not operated by scan tool
Leak detection pump Not operated by scan tool
Both of the following conditions are met before key off: Conditions 1 and 2
1. Duration that vehicle has been driven 5 minutes or more
2. EVAP purge operation Performed
ECT 4.4 to 35°C (40 to 95°F)
IAT 4.4 to 35°C (40 to 95°F)
  1. Key-off monitor sequence 1 to 8 
    1. ATMOSPHERIC PRESSURE MEASUREMENT

    Next sequence is run if following condition is met: -
    Atmospheric pressure change Less than 0.3 kPa (2.25 mmHg) for 1 second
    2. FIRST REFERENCE PRESSURE MEASUREMENT

    Next sequence is run if all of the following conditions are met: Conditions 1, 2 and 3
    1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less
    2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg)
    3. Reference pressure Saturated within 1 minute
    3. EVAP CANISTER VENT VALVE CLOSE STUCK CHECK

    Next sequence is run if following condition is met: -
    EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more
    4. VACUUM INTRODUCTION

    Next sequence is run if the following condition is met: -
    EVAP pressure 15 minutes or less
    5. EVAP CANISTER PURGE VALVE CLOSE STUCK CHECK

    Next sequence is run if following condition is met: -
    EVAP pressure change after purge valve is open 0.3 kPa (2.25 mmHg) or more
    6. SECOND REFERENCE PRESSURE MEASUREMENT

    Next sequence is run if all of following conditions are met: Conditions 1, 2, 3 and 4
    1. EVAP pressure just after reference pressure measurement start -1 kPa (-7.5 mmHg) or less
    2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg)
    3. Reference pressure Saturated within 1 minute
    4. Difference between first reference pressure and second reference pressure Less than 0.7 kPa (5.25 mmHg)
    7. LEAK CHECK

    Next sequence is run if following condition is met: -
    EVAP pressure when vacuum introduction is complete Less than second reference pressure
    8. ATMOSPHERIC PRESSURE MEASUREMENT

    EVAP monitor is complete if the following condition is met: -
    Atmospheric pressure difference between sequence 1 and 8 0.3 kPa (2.25 mmHg) or less
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