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Home >> Lexus >> 2007 >> RX 400h AWD >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> SFI System >> DTC P1420 Evaporative Emission Canister Small Leak; DTC P1421 Evaporative Emission Canister Gross Leak >> Typical Enabling Conditions

Typical Enabling Conditions

TYPICAL ENABLING CONDITIONS

The monitor will run whenever these DTCs are not present -
EVAP key-off monitor runs 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)
Ignition switch OFF
Engine condition Not running
Pressure sensor (built in pump module) malfunction (P0450, P0451, P0452 and/or 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 ignition switch OFF Conditions 1 and 2
1. Duration that vehicle is being driven 5 minutes or more
2. Purge flow Executed
ECT 4.4 to 35°C (40 to 95°F)
IAT 4.4 to 35°C (40 to 95°F)
Time after engine stopped 5 hours

Example of restart time 

TYPICAL ENABLING CONDITIONS

First time 7 hours
Second time 9 hours and 30 minutes

Key-off monitor sequence 1 to 15 

  1. Atmospheric pressure measurement 
    KEY-OFF MONITOR REFERENCE

    Next sequence is run if the following condition is met: -
    Atmospheric pressure change for 10 sec. Less than 0.3 kPa (2.25 mmHg) for 1 second
  2. First reference pressure measurement 
    KEY-OFF MONITOR REFERENCE

    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 within 1 minute
  3. Vent valve stuck closed check 
    KEY-OFF MONITOR REFERENCE

    Next sequence is run if the following condition is met: -
    EVAP change for 10 seconds after vent valve ON (Closed) 0.3 kPa (2.25 mmHg) or more
  4. Vacuum introduction for canister 
    KEY-OFF MONITOR REFERENCE

    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. EVAP pressure Saturated
  5. EVAP VSV stuck closed check 
    KEY-OFF MONITOR REFERENCE

    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 
    KEY-OFF MONITOR REFERENCE

    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 began -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 1 minute
    4. Reference pressure difference between the first and second 0.7 kPa (5.25 mmHg) or less
  7. Canister leak check 
    KEY-OFF MONITOR REFERENCE

    Next sequence is run if the following condition is met: -
    EVAP pressure when vacuum introduction was complete Less than second reference pressure
  8. Fuel vapor-containment valve (FVCV stuck closed check) 
    KEY-OFF MONITOR REFERENCE

    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 
    KEY-OFF MONITOR REFERENCE

    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 
    KEY-OFF MONITOR REFERENCE

    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 
    KEY-OFF MONITOR REFERENCE

    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 
    KEY-OFF MONITOR REFERENCE

    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 second and third Less than 0.7 kPa (5.25 mmHg)
  13. Fuel tank leak check 
    KEY-OFF MONITOR REFERENCE

    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 
    KEY-OFF MONITOR REFERENCE

    Next sequence is run if the following condition is met: -
    FTP change while FVCV and vent valve are open Less than 0.3 kPa (2.25 mmHg)
  15. Atmospheric pressure measurement 
    KEY-OFF MONITOR REFERENCE

    Monitor is complete if the following condition is met: -
    Atmospheric pressure difference between sequence 1 and 8 0.35 kPa (2.6 mmHg) or less
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