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Typical Enabling Conditions

WARNING: This page is about a different car, the 2006 Lexus RX 400h. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL ENABLING CONDITIONS CHART

EVAP key-off monitor is run when all of the following conditions are met: -
Atmospheric pressure 70 to 110 kPa (525 to 825 mmHg)
Battery voltage 10.5 V or more
Vehicle speed Below 2.5 mph (4 km/h)
Engine switch OFF
FTP sensor malfunction (P0450, P0451, P0452 and P0453) Not detected
EVAP 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 is being 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)
Time after engine stop 5 hours

Example of restart time 

TYPICAL ENABLING CONDITIONS CHART

First time 7 hours
Second time 9 hours and 30 minutes

Key-off monitor sequence 1to 15 

  1. Atmospheric pressure measurement 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if the following condition is met: -
    Atmospheric pressure change for 10 seconds Less than 0.3 kPa (2.25 mmHg) for 1 second
  2. First reference pressure measurement 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if all of the following conditions are met: Conditions 1, 2 and 3
    1. EVAP pressure when 1.9 seconds after reference pressure measurement -1 kPa (-7.5 mmHg) or less
    2. Reference pressure -4.85 to -1.057 kPa (-36.38 to -7.93 mmHg)
    3. Reference pressure Saturated
  3. Vent valve stuck closed check 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if the following condition is met: -
    EVAP pressure change for 10 seconds after vent valve ON (Closed) 0.3 kPa (2.25 mmHg) or more
  4. Vacuum introduction for canister 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if both of the following conditions are met: Conditions 1 and 2
    1. Vacuum introduction time 15 minutes or less
    2. FTP Saturated
  5. EVAP VSV stuck closed check 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if the following condition is met: -
    EVAP pressure change for 10 seconds after EVAP VSV ON (Open). 0.3 kPa (2.25 mmHg) or more
  6. Second reference pressure measurement 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if all of the following conditions are met: Conditions 1, 2, 3 and 4
    1. EVAP pressure when 1.9 sec. after reference pressure measurement -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
    4. Reference pressure difference between the first and second 0.7 kPa (5.25 mmHg) or less
  7. Canister leak 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if the following condition is met: -
    Canister leak when vacuum introduction was complete Second reference pressure or less
  8. Fuel vapor-containment valve (FVCV stuck closed check) 
    TYPICAL ENABLING CONDITIONS CHART

    Sequence 14 is run if all of the following conditions are met: Conditions 1 and 2
    1. FTP when EVAP monitor started -2 kPa (-15 mmHg) or less, or 3 kPa (22.5 mmHg) or more
    2. FTP change while FVCV and vent valve are open 0.5 kPa (3.75 mmHg) or more
  9. Vacuum introduction for fuel tank 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if both of the following conditions are met: Conditions 1 and 2
    1. FTP when EVAP monitor started -2 to 3 kPa (-15 to 22.5 mmHg)
    2. Vacuum introduction time 15 minutes or less
  10. FVCV stuck closed check 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if the following condition is met:  
    FTP change when vacuum introduction for fuel tank 0.5 kPa (3.75 mmHg)
  11. FTP sensor stuck check 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if the following condition is met:  
    FTP change when FVCV closed 0.35 kPa (2.6 mmHg) or less
  12. Third reference pressure measurement 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if all of the following conditions are met: Conditions 1, 2, 3, and 4
    1. FTP when 1.9 seconds after reference pressure measurement began -1 kPa (-7.5 mmHg) or more
    2. Reference pressure -4.85 to -1.057 kPa (-36.4 to -7.93 mmHg)
    3. Reference pressure Saturated
    4. Reference pressure difference between the second and third Less than 0.7 kPa (5.25 mmHg)
  13. Fuel tank leak check 
    TYPICAL ENABLING CONDITIONS CHART

    Sequence is run if the following condition is met:  
    FTP when vacuum introduction for fuel tank was complete Less than third reference pressure
  14. FTP sensor stuck check 
    TYPICAL ENABLING CONDITIONS CHART

    Next sequence is run if the following condition is met: -
    FTP change while FVCV and vent valve are open Less than 0.35 kPa (2.6 mmHg)
  15. Atmospheric pressure measurement 
    TYPICAL ENABLING CONDITIONS CHART

    Monitor is complete -
    Atmospheric pressure difference between sequence 1 and 8 0.3 kPa (2.25 mmHg) or less
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