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Home >> Lexus >> 2006 >> LS 430 >> Repair and Diagnosis >> Engine Performance >> System >> SFI System - Diagnostics >> DTC P2419 Evaporative Emission Pressure Switching Valve Stuck On; DTC P2420 Evaporative Emission Pressure Switching Valve Stuck Off >> Typical Enabling Conditions

Typical Enabling Conditions

TYPICAL ENABLING CONDITIONS

Enable conditions of EVAP key-OFF monitor  
P043E (Reference orifice - low flow)
P043F (Reference orifice - high flow)
P0441 (Purge VSV - stuck open)
P0441 (Purge VSV - stuck closed)
P0451 (Canister pressure sensor - noise)
P0455 (EVAP gross leak)
P0456 (EVAP 0.02 inch leak)
P2401 (Leak detection pump - stuck OFF)
P2402 (Leak detection pump - stuck ON)
P2419 (Vent valve - stuck ON)
P2420 (Vent valve - stuck OFF)		  
Atmospheric pressure 70 to 110 kPa (525 to 825 mmHg)
Battery voltage 10.5 V or higher
Vehicle speed 4 km/h (2.5 mph) or less
Ignition switch OFF
Time after key off 5 or 7 or 9.5 hours
Canister pressure sensor malfunction (P0450, P0452, 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 1 and 2 are met before key off -
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 
      KEY-OFF MONITOR SEQUENCE

      Next sequence is run if the following condition is met -
      Atmospheric pressure change Within 0.3 kPa (2.25 mmHg) in 1 second
    2. First reference pressure measurement 
      KEY-OFF MONITOR SEQUENCE

      Next sequence is run if the following conditions are met -
      EVAP pressure just after reference pressure measurement start 1 kPa ( 7.5 mmHg) or lower
      Reference pressure -4.85 to -1.05 kPa (726 to 754 mmHg)
      Reference pressure Saturated within 60 seconds
    3. Vent valve stuck closed check 
      KEY-OFF MONITOR SEQUENCE

      Next sequence is run if the following condition is met -
      EVAP pressure change after vent valve is ON 0.3 kPa (2.25 mmHg) or more
    4. Vacuum introduction 
      KEY-OFF MONITOR SEQUENCE

      Next sequence is run if the following condition is met -
      EVAP pressure Saturated within 900 seconds
    5. Purge VSV stuck closed check 
      KEY-OFF MONITOR SEQUENCE

      Next sequence is run if the 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 
      KEY-OFF MONITOR SEQUENCE

      Next sequence is run if the following conditions are met -
      EVAP pressure just after reference pressure measurement 1 kPa (7.5 mmHg) or lower
      Reference pressure -4.85 to -1.05 kPa (726 to 754 mmHg)
      Reference pressure Saturated within 60 seconds
      Difference between first reference pressure Less than 0.7 kPa (5.25 mmHg)
    7. Leak check 
      KEY-OFF MONITOR SEQUENCE

      Next sequence is run if the following condition is met -
      EVAP pressure when vacuum introduction is complete Lower than second reference pressure
    8. Atmospheric pressure measurement 
      KEY-OFF MONITOR SEQUENCE

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