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Home >> Lexus >> 2007 >> IS 350 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (2GR-FSE) - DTC P0606 - P2A03, DTC U0101 >> DTC P2401 Evaporative Emission System Leak Detection Pump Control Circuit Low; DTC P2402 Evaporative Emission System Leak Detection Pump Control Circuit High >> Typical Enabling Conditions
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Typical Enabling Conditions

TYPICAL ENABLING CONDITIONS

Monitor runs whenever following DTCs not present None
EVAP key-off monitor runs when all of 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
Time after key off 5, 7 or 9.5 hours
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 following conditions are met before key OFF: Conditions 1 and 2
1. Duration that vehicle 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 
      KEY-OFF MONITOR REFERENCE

      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 
      KEY-OFF MONITOR REFERENCE

      Next sequence is run if all of 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 -1.05 kPa (-36.38 to -7.87 mmHg)
      3. Reference pressure Saturated within 1 minute
    3. Vent valve stuck closed check 
      KEY-OFF MONITOR REFERENCE

      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 and leak 
      KEY-OFF MONITOR REFERENCE

      Next sequence is run if following condition is met: -
      Vacuum introduction time 15 minutes or less
    5. EVAP VSV stuck closed check 
      KEY-OFF MONITOR REFERENCE

      Next sequence is run if following condition is met: -
      FTP change after purge VSV ON 0.3 kPa (2.25 mmHg) or more
    6. Second reference pressure measurement 
      KEY-OFF MONITOR REFERENCE

      Next sequence is run if all of following condition are met: Conditions 1, 2, 3 and 4
      1. FTP just after reference pressure measurement started -1 kPa (-7.5 mmHg) or less
      2. Reference pressure -4.85 to -1.05 kPa (-36.38 to -7.87 mmHg)
      3. Reference pressure Saturated within 1 minute
      4. Reference pressure difference between first and second Less than 0.7 kPa (5.25 mmHg)
    7. Leak check 
      KEY-OFF MONITOR REFERENCE

      Next sequence is run if following condition is met: -
      FTP when vacuum introduction was complete Second reference pressure or less
    8. Atmospheric pressure 
      KEY-OFF MONITOR REFERENCE

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