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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Engine Control System - SFI System Diagnostics (4 Of 4)) >> DTC P2420 Evaporative Emission System Switching Valve Control Circuit High >> Typical Enabling Conditions

Typical Enabling Conditions

WARNING: This page is about a different car, the 2008 Lexus IS F. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL ENABLING CONDITIONS CHART

Monitor runs whenever following DTCs not present None
EVAP key-off monitor runs when all of following conditions 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
Canister pressure sensor malfunction (P0451, 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 following conditions met before key off Conditions 1 and 2
1 Duration that vehicle driven 5 minutes or more
2 EVAP purge operation Performed
Engine coolant temperature 4 4 to 35°C (40 to 95°F)
Intake air temperature 4 4 to 35°C (40 to 95°F)
  1. Key-off monitor sequence 1 to 8 
    1. Atmospheric Pressure Measurement 
      TYPICAL ENABLING CONDITIONS CHART

      Next sequence run if following condition set -
      Atmospheric pressure change Less than 0 3 kPa-g (2 25 mmHg-g) in 1 second
    2. First reference Pressure Measurement 
      TYPICAL ENABLING CONDITIONS CHART

      Next sequence run if all of the following conditions set Condition 1, 2 and 3
      1 EVAP pressure just after reference pressure measurement started -1 kPa-g (-7 5 mmHg-g) or less
      2 Reference pressure -4 85 to -1 057 kPa-g (-36 4 to -7 93 mmHg-g)
      3 Reference pressure Saturated within 60 seconds
    3. Vent Valve Stuck Closed Check 
      TYPICAL ENABLING CONDITIONS CHART

      Next sequence run if following condition set -
      EVAP pressure change after vent valve ON (closed) 0 3 kPa-g (2 25 mmHg-g) or more
    4. Vacuum Introduction 
      TYPICAL ENABLING CONDITIONS CHART

      Next sequence run if following condition set -
      EVAP pressure Saturated within 15 minutes
    5. Purge VSV Stuck Closed Check 
      TYPICAL ENABLING CONDITIONS CHART

      Next sequence run if following condition set -
      EVAP pressure change after purge VSV ON (open) 0 3 kPa-g (2 25 mmHg-g) or more
    6. Second Reference Pressure Measurement 
      TYPICAL ENABLING CONDITIONS CHART

      Next sequence run if all of following conditions set Condition 1, 2, 3 and 4
      1 EVAP pressure just after reference pressure -1 kPa-g (-7 5 mmHg-g) or less
      2 Reference pressure -4 85 to -1 057 kPa-g (-36 4 to -7 93 mmHg-g)
      3 Reference pressure Saturated within 60 seconds
      4 Reference pressure difference between first and second Less than 0 7 kPa-g (5 25 mmHg-g)
    7. Leak Check 
      TYPICAL ENABLING CONDITIONS CHART

      Next sequence run if following condition set -
      EVAP pressure when vacuum introduction complete Second reference pressure or less
    8. Atmospheric Pressure Measurement 
      TYPICAL ENABLING CONDITIONS CHART

      EVAP monitor complete if following condition set -
      Atmospheric pressure difference between sequence 1 and 8 Within 0 3 kPa-g (2 25 mmHg-g)
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