Emission Control System - 1ZZ-FE: Inspection

CHARCOAL CANISTER ASSY

Fig 1: Checking Charcoal Canister (2WD)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. Visually check the charcoal canister for cracks or damage.
  
  Fig 2: Checking Charcoal Canister (4WD)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Inspect the charcoal canister operation.
  
  Fig 3: Inspecting Charcoal Canister Operation (2WD)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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 4: Inspecting Charcoal Canister Operation (4WD)
    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 5: Checking Air Flow From Air Inlet Port (2WD)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 6: Checking Air Flow From Air Inlet Port (4WD)
    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 7: Checking Vacuum Decreasing Position (2WD)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    Fig 8: Checking Vacuum Decreasing Position (4WD)
    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.
    
    Fig 9: Removing Hose & Cap From Vent Port (2WD)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    If operation is not as specified, replace the charcoal canister.
  6. Remove the hose and cap from vent port.
    
    Fig 10: Removing Hose & Cap From Vent Port (4WD)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Inspect VSV for Pressure Switching Valve
  
  Fig 11: Inspecting VSV Pressure Switching Valve
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  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.
  2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
    If there is continuity, replace the VSV.
    
    Fig 12: Inspecting VSV Pressure Switching Valve
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check that air does not flow from ports E to F.
    
    Fig 13: 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 flows from ports E to F.
  If operation is not as specified, replace the VSV.
VENTILATION VALVE SUB-ASSY

Fig 15: Inspecting PCV Valve Operation From Cylinder Head Side
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
  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

Fig 17: Checking Fuel Tank Cap
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1. Visually check if cap and/or gasket are deformed or damaged.
  If necessary, repair or replace the cap.
VACUUM SWITCHING VALVE NO.1

Fig 18: Checking Vacuum Switching Valve No.1
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
  2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
    If there is continuity, replace the VSV.
    
    Fig 19: Checking Continuity Between Each Terminal & Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check that air flows from ports E to F.
    
    Fig 20: 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.
VACUUM SWITCHING VALVE ASSY NO.1

Fig 22: Checking Continuity Between Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
  2. Using an ohmmeter, check that there is no continuity between each terminal and the body.
    If there is continuity, replace the VSV.
    
    Fig 23: Checking Continuity Between Each Terminal & Body
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Check that air flows from ports A to B.
    
    Fig 24: 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.