Emission Control System: Inspection

CHARCOAL CANISTER ASSY
1. Visually check the charcoal canister for cracks or damage.
  
  Fig 1: Checking 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 and 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 and check that air does not flow from the air inlet port.
    
    Fig 3: Checking Air Does Not Flow From Air Inlet Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Apply vacuum (3.43 kPa, 25.7 mmHg, 1.01 in.Hg) to the purge port, check that the vacuum dose not decrease when the air inlet port is closed, and check that the vacuum decreases when the air inlet port is released.
    
    Fig 4: Checking Vacuum Decreases When Air Inlet Port Is 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 operation is not as specified, replace the charcoal canister.
  6. Remove the hose and cap from vent port.
  Fig 5: Checking Air Flow Into Purge Port
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect VSV for Pressure Switching Valve
  1. Using an ohmmeter, check that there is continuity between the terminals.
    Resistance: 37 - 44 Ω at 20°C (68°F)
    
    If there is no continuity, replace the VSV.
    
    Fig 6: Checking Continuity Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
    If there is continuity, replace the VSV.
    
    Fig 7: Checking No Continuity Between Terminal And Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check that air does not flow from ports E to F.
    
    Fig 8: Checking Air Does Not Flow From Ports E To F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Apply battery positive voltage across the terminals.
  5. Check that air flows from ports E to F.
  If operation is not as specified, replace the VSV.
Fig 9: Connecting Battery Positive Voltage Across Terminals And Checking Air Flow From Ports E To F
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
VENTILATION VALVE SUB-ASSY
1. Install clean hose to the PCV valve.
2. Inspect the PCV valve operation.
  1. Blow air into the cylinder head side, and check that air passes through easily.
    CAUTION: Do not suck air through the valve. Petroleum substances inside the valve air harmful.
    
    Fig 10: Inspecting PCV Valve Operation
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Blow air into the intake manifold side, and check that air passes through with difficulty.
    If operation is not as specified, replace the PCV valve.
  3. Remove clean hose from the PCV valve.
  Fig 11: Checking Air Pass
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
FUEL TANK CAP ASSY
1. Visually check if cap and/or gasket are deformed or damaged.
If necessary, repair or replace the cap.

Fig 12: Identifying Fuel Tank Cap Assy Gasket
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VACUUM SWITCHING VALVE NO.1
1. Inspect VSV for evaporative emission (EVAP).
  1. Using an ohmmeter, check that there is continuity between the terminals.
    Resistance: 27 - 33 Ω at 20°C (68°F)
    
    If there is no continuity, replace the VSV.
    
    Fig 13: Checking Continuity Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
    If there is continuity, replace the VSV.
    
    Fig 14: Checking No Continuity Between Each Terminal And Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check that air flows from ports E to F.
    
    Fig 15: Checking Air Flow From Ports E To F
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Apply battery positive voltage across the terminals.
  5. Check that air does not flow from ports E to F.
  If operation is not as specified, replace the VSV.
  
  Fig 16: Applying Battery Positive Voltage Across Terminals And Checking Air Does Not Flow From Ports E To F
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
VACUUM SWITCHING VALVE ASSY NO.1
1. Inspect VSV for Canister Closed valve (CCV).
  1. Using an ohmmeter, check that there is continuity between the terminals.
    Resistance: 25 - 30 Ω at 20°C (68°F)
    
    If there is no continuity, replace the VSV.
    
    Fig 17: Checking Continuity Between Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
    If there is continuity, replace the VSV.
    
    Fig 18: Checking No Continuity Between Each Terminal And Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check that air flows from ports A to B.
    
    Fig 19: Checking Air Flows From Ports A To B
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. Apply battery positive voltage across the terminals.
  5. Check that air does not flow from ports A to B.
  If operation is not as specified, replace the VSV.
Fig 20: Applying Battery Positive Voltage Across Terminals And Checking Air Does Not Flow From Ports A To B
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002