Emission Control System: Inspection

INSPECT VENTILATION VALVE SUB-ASSY
1. Install a clean hose to the ventilation valve.
2. Check ventilation 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 are dangerous to your health.
    
    Fig 1: Blowing Air Into Cylinder Head Side To Check That Air Passes Through Easily
    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 ventilation valve.
3. Remove the clean hose from the ventilation valve.
  
  Fig 2: Blowing Air Into Intake Manifold Side, To Check That Air Passes Through With Difficulty
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FUEL TANK CAP ASSY
1. Visually check if the cap and gasket are deformed or damaged.
  
  Fig 3: Checking Cap & Gasket For Deformations Or Damage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT CHARCOAL CANISTER ASSY
1. Visually check the charcoal canister for cracks or damage.
  If cracks or damage are found, replace the charcoal canister assy.
  
  Fig 4: Checking Charcoal Canister For Cracks Or Damage
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check charcoal canister operation.
  1. With the purge port closed, blow 1.67 kPa (17.0 gf/cm² , 0.24 psi) of air into the vent port, and check that air flows from the air inlet port.
    If the result is not as specified, replace the charcoal canister assy.
    
    Fig 5: Checking Charcoal Canister Operation (With Purge Port Closed)
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. With the vent port closed, blow 1.10 kPa (11.2 gf/cm² , 0.16 psi) air to the air inlet port, and check that air flows from the purge port.
    If the result is not as specified, replace the charcoal canister assy.
    
    Fig 6: Blowing Air Into Air Inlet Port To Check That Air Flows From The Purge Port
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Check for air leakage.
  1. Remove the air hose between ports A and B.
  2. Connect the pressure gauge to the vent port of the charcoal canister.
    SST 09992-00242
  3. While holding port B, with the purge port and the air inlet port closed and port A open, apply pressurized air 19.6 kPa (0.2 kgf/cm² , 2.81 psi) into the vent port, then confirm that the pressure is retained for 1 minute.
    If the result is not as specified, replace the charcoal canister assy.
    
    Fig 7: Applying Pressurized Air Into Vent Port With Purge Port & Air Inlet Port Closed & Port A Open
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
4. Check the leak detection pump.
  1. Remove the detection pump from the charcoal canister.
  2. Check that air flows from port A to B and then C.
    If the result is not as specified, replace the charcoal canister assy.
    
    Fig 8: Checking Leak Detection Pump
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Connect the positive (+) lead to terminal 7 and the negative (-) lead to terminal 6.
  4. Check that the valve is closed.
    If the result is not as specified, replace the charcoal canister assy.
  5. Install the detection pump.
    
    Fig 9: Connecting Positive (+) Lead To Terminal 7 & Negative (-) Lead To Terminal 6
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT VACUUM SWITCHING VALVE NO.1

Check the VSV for open circuit.

Measure the resistance.

Standard:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
1-2	26 to 30 Ω at 20°C (68°F)
1 - Body ground 2 - Body ground	10 kΩ or higher

If the resistance is not as specified, replace the VSV assy.

Fig 10: Measuring Resistance

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Check VSV operation.
1. Check that air does not flow from the port as shown in the illustration.
  
  Fig 11: Checking VSV Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Apply battery positive voltage across the terminals.
3. Check that air flows from the ports.
  If the result is not as specified, replace the VSV assy.
  
  Fig 12: Checking Air Flows From Ports
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002