Emission Control System: Inspection

INSPECT CHARCOAL CANISTER ASSY
1. Visually check the charcoal canister for cracks or damage.
  
  Fig 1: Checking Points Of Charcoal Canister For Cracks Or Damage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the charcoal canister operation.
  1. Plug the vent port with the cap.
  2. While holding the purge port closed, blow air (1.76 kPa, 18 gf/cm² , 0.26 psi) into the EVAP port to check that air flows from the air drain port.
    
    Fig 2: Inspecting Charcoal Canister Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. While holding the purge port and the air drain port closed, blow air (1.76 kPa, 18 gf/cm² , 0.26 psi) into the EVAP port to check that air does not flow from the air inlet port.
    
    Fig 3: Checking That Air Does Not Flow From Air Inlet Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Apply a vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the purge port, check that the vacuum does not decrease when the air inlet port in closed, and check that the vacuum decreases when the air inlet port is released.
    If the result is not as specified, replace the charcoal canister assy.
    
    Fig 4: Checking Vacuum Decreases When Air Inlet Port Released
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. While holding the air inlet port closed, apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the EVAP port and check that air flows into the purge port.
    If result is not as specified, replace the charcoal canister.
  6. Remove the cap from vent port.
  Fig 5: Checking Air Flows Into Purge Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VACUUM SWITCHING VALVE ASSY FOR ACIS
1. Measure the VSV resistance.
  
  Fig 6: VSV Resistance Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the VSV assy.
  
  Fig 7: Measuring VSV Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check VSV operation.
  1. Check that air does not flow from port E to port F.
    If the result is not as specified, replace the VSV assy.
    
    Fig 8: Checking Air Does Not Flow From Port E To Port F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Apply battery positive voltage across the terminals.
  3. Check that air flows from port E to port F.
    If the result is not as specified, replace the VSV assy.
    
    Fig 9: Checking Air Flows From Port E To Port F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VACUUM SWITCHING VALVE ASSY FOR PSV
1. Measure the VSV for resistance.
  
  Fig 10: VSV Resistance Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the VSV assy.
  
  Fig 11: Measuring Vacuum Switching Valve (VSV) Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check VSV operation.
  1. Check the air does not flow from port E to port F.
    
    Fig 12: Checking Air Does Not Flow From Port E To Port F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Apply battery positive voltage across the terminals.
  3. Check that air flows from port E to port F.
  If the result is not as specified, replace the VSV assy.
  
  Fig 13: Checking Air Flows From Port E To Port F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VENTILATION VALVE SUB-ASSY
1. Install a clean hose to the PCV valve.
2. Inspect PCV valve operation.
  1. Blow air from the cylinder head side of the engine, and check that air passes through easily.
    CAUTION: Do not suck air through the valve. Petroleum substances stuck to the valve is harmful.
    
    Fig 14: Inspecting Ventilation Valve Sub-Assy
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Blow air from the intake manifold side of the engine, and check that air passes through with difficulty.
    If the result is not as specified, replace the PCV valve.
3. Remove the clean hose from the PCV valve.
  
  Fig 15: Checking Air Passes Through With Difficulty
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL TANK CAP ASSY
1. Visually check if cap and/or gasket are deformed or damaged.
  If necessary, repair or replace the cap.
Fig 16: Identifying Gasket
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VACUUM SWITCHING VALVE ASSY FOR EVAP
1. Measure the VSV resistance.
  
  Fig 17: VSV Resistance Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the VSV assy.
  
  Fig 18: Measuring VSV Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check VSV operation.
  1. Check that air does not flow from port E to port F.
    If the result is not as specified, replace the VSV assy.
    
    Fig 19: Checking Air Does Not Flow From Port E To Port F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Apply battery positive voltage across the terminals.
  3. Check that air flow from port E to port F.
    If the result is not as specified, replace the VSV assy.
    
    Fig 20: Checking Air Flow From Port E To Port F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT VACUUM SWITCHING VALVE ASSY FOR CCV
1. Measure the VSV for resistance.
  
  Fig 21: VSV Resistance Chart
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If the result is not as specified, replace the VSV assy.
  
  Fig 22: Measuring VSV Resistance
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the VSV operation.
  1. Check that air does not flow from port A to port B.
    
    Fig 23: Checking Air Does Not Flow From Port A To Port B
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Apply battery positive voltage across the terminals.
  3. Check that air does not flow from port A to port B.
    If the result is not as specified, replace the VSV assy.
    
    Fig 24: Checking Air Does Not Flow From Port A To Port B
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002