Emission Control System: Inspection

WARNING: This page is about a different variant/trim than selected.

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: Checking Air Flows From Air Drain Port While Holding Purge Port Closed
    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 While Holding Purge Port & Air Drain Port Closed
    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 Flows Into Purge Port While Holding Air Inlet Port Closed
  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.
    
    Fig 6: Checking Continuity Between Terminals Using An Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Resistance: 37 - 44 Ω at 20°C (68°F)
    If there is no continuity, replace the VSV.
  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 Each Terminal & Body Using An Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check that air does not flow from ports E to F shown in Fig 8.
    
    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 shown in Fig 9.
    
    Fig 9: Checking Air Flows From Ports E To F While Applying Battery Positive Voltage Across Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If operation is not as specified, replace the VSV.
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: Checking Air Passes Through Easily From Cylinder Head Side
    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.
FUEL TANK CAP ASSY
1. Visually check if cap and/or gasket are deformed or damaged.
  
  Fig 12: Checking Fuel Tank Cap Gasket
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If necessary, repair or replace the cap.
VACUUM SWITCHING VALVE No. 1
1. Inspect VSV for evaporative emission (EVAP).
  1. Using an ohmmeter, check that there is continuity between the terminals.
    
    Fig 13: Checking Continuity Between Terminals Using An Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Resistance: 27 - 33 Ω at 20°C (68°F)
    If there is no continuity, replace the VSV.
  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 & Body Using An Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check that air flows from ports E to F shown in Fig 15.
    
    Fig 15: Checking Air Flows 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 shown in Fig 16.
    
    Fig 16: Checking Air Does Not Flow From Ports E To F While Applying Battery Positive Voltage Across Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  If operation is not as specified, replace the VSV.
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.
    
    Fig 17: Checking Continuity Between Terminals Using An Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Resistance: 25 - 30 Ω at 20°C (68°F)
    If there is no continuity, replace the VSV.
  2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
    
    Fig 18: Checking No Continuity Between Each Terminal & Body Using An Ohmmeter
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If there is continuity, replace the VSV.
  3. Check that air flows from ports A to B shown in Fig 19.
    
    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 shown in Fig 20.
    
    Fig 20: Checking Air Does Not Flow From Ports A To B While Applying Battery Positive Voltage Across Terminals
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  If operation is not as specified, replace the VSV.