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Home >> Lexus >> 2010 >> GS 350 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 153 (Engine Control (SFI) System (2GR-FE) (DTCS P0365 - 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 350. However, it is still accessible from the selected car via links, so may be relevant.
Monitor runs whenever following DTCs not present None
EVAP key-off monitor runs when all of the following conditions are met: -
Atmospheric pressure 70 to 110 kPa-a (525 to 825 mmHg-a)
Battery voltage 10.5 V or more
Vehicle speed Below 2.5 mph (4 km/h)
Engine switch Off
Time after key off 5 or 7 or 9.5 hours
EVAP pressure sensor malfunction (P0450, P0451, P0452 and P0453) Not detected
EVAP canister purge valve Not operated by scan tool
EVAP canister vent valve Not operated by scan tool
EVAP 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 the 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 -1 kPa (-7.5 mmHg) or less
    2. Reference pressure -4.85 to -1.057 kPa (-36.4 to -7.93 mmHg)
    3. Reference pressure Saturated within 60 seconds
    3. EVAP CANISTER VENT VALVE CLOSE STUCK CHECK

    Next sequence is run if the 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 Saturated within 15 minutes
    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 the following conditions are met: Conditions 1, 2, 3 and 4
    1. EVAP pressure just after reference pressure -1 kPa (-7.5 mmHg) or less
    2. Reference pressure -4.85 to -1.057 kPa (-36.4 to -7.93 mmHg)
    3. Reference pressure Saturated within 60 seconds
    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 the following condition is met: -
    EVAP pressure when vacuum introduction complete Second reference pressure or less
    8. ATMOSPHERIC PRESSURE MEASUREMENT

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