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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 179 (Engine Control System (2GR-FSE) - DTC P050B - P2A03, DTC U0101) >> 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 350. However, it is still accessible from the selected car via links, so may be relevant.
TYPICAL ENABLING CONDITIONS

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
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 
      TYPICAL ENABLING CONDITIONS

      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 
      TYPICAL ENABLING CONDITIONS

      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 started -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 stuck close stuck check 
      TYPICAL ENABLING CONDITIONS

      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 
      TYPICAL ENABLING CONDITIONS

      Next sequence is run if following condition is met: -
      EVAP pressure Saturated within 15 minutes
    5. EVAP canister purge valve close stuck check 
      TYPICAL ENABLING CONDITIONS

      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 
      TYPICAL ENABLING CONDITIONS

      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 measurement start -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-g (5.25 mmHg-g)
    7. Leak check 
      TYPICAL ENABLING CONDITIONS

      Next sequence is run if following condition is met: -
      EVAP pressure when vacuum introduction complete Second reference pressure or less
    8. Atmospheric pressure measurement 
    TYPICAL ENABLING CONDITIONS

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