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Emission Control System (2ZZ-GE): Inspection

  1. INSPECT VENTILATION VALVE SUB-ASSY 
    1. Check the operation.
      1. Install a clean hose as shown in the illustration.
      2. Blow air into the cylinder head side, and check that the air passes through freely.
        CAUTION: Do not suck air through the ventilation valve. Petroleum substances inside the ventilation valve are harmful.
        Fig 1: Checking Air Passes Through Ventilation Valve Freely
        G02678415Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Blow air into the intake manifold side, and check that the air does not pass through freely.

        If the operation is not as specified, replace the ventilation valve.

        Fig 2: Checking Air Does Not Passes Through Ventilation Valve Freely
        G02678416Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT FUEL TANK CAP ASSY 
    1. Check the appearance.
      1. Visually check whether the fuel tank cap and gasket are deformed or damaged.

        If necessary, repair or replace the cap and/or gasket.

        Fig 3: Checking Fuel Tank Cap And Gasket
        G02678417Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. 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
      G02678418Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check charcoal canister operation.
      1. While holding the purge port closed, blow air at 1.67 kPa (17.0 gf/cm2 , 0.24 psi) into the vent port, and check that the air flows from the air inlet port.

        If the result is not as specified, replace the charcoal canister assy.

        Fig 5: Checking Air Flows From Air Inlet Port
        G02678419Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. While holding the vent port closed, apply vacuum of 1.10 kPa (8.3 mmHg, 0.32 in.Hg) into the purge port, and check that the air flows from the air inlet port.

        If the result is not as specified, replace the charcoal canister assy.

        Fig 6: Checking Air Flows From Air Inlet Port
        G02678420Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the 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, the purge port and the air inlet port closed and port A open, apply pressurized air at 19.6 kPa (0.2 kgf/cm2 , 2.81 psi) into the vent port, then confirm that the pressure is retained.

        If the result is not as specified, replace the charcoal canister assy.

        Fig 7: Checking Air Leakage
        G02678421Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Check leak detection pump.
      1. Check that air flows from port A to ports B and C. If the result is not as specified, replace the pump module.
        Fig 8: Checking Leak Detection Pump
        G02678422Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Apply battery positive voltage across the terminals.
      3. Check that the valve is closed.

        If the result is not as specified, replace the pump module.

        Fig 9: Checking Valve Is Closed
        G02678423Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT VACUUM SWITCHING VALVE ASSY NO.1 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        TESTER CONNECTION AND SPECIFIED CONDITION (1 OF 4)

        Tester Connection Specified Condition
        1-2 26 to 30° at 20°C (68°F)

        If the resistance is not as specified, replace the vacuum switching valve No. 1.

        Fig 10: Measuring Resistance Between Terminals
        G02678424Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the vacuum switching valve No. 1 for ground.
      1. Using an ohmmeter, check the resistance between each terminal and the body.

        Standard: 

        TESTER CONNECTION AND SPECIFIED CONDITION (2 OF 4)

        Tester Connection Specified Condition
        1 - Body 10M Ω or higher
        2 - Body 10M Ω or higher

        If the resistance is not as specified, replace the vacuum switching valve No. 1.

        Fig 11: Checking Resistance Between Each Terminal And Body
        G02678425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the operation.
      1. Check that air does not flow from port E to port F. If the operation is not as specified, replace the vacuum switching valve No. 1.
        Fig 12: Checking Air Does Not Flow From Port E To Port F
        G02678426Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Apply battery voltage across the terminals.
      3. Check that air flows from port E to port F.

        If the operation is not as specified, replace the vacuum switching valve No. 1.

        Fig 13: Checking Air Flows From Port E To Port F
        G02678427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT HEATED OXYGEN SENSOR 
    1. Check the resistance. (Bank 1 Sensor 1)
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        TESTER CONNECTION AND SPECIFIED CONDITION (3 OF 4)

        Tester Connection Specified Condition
        1(+B)-2(HT) 5 to 10 Ω at 20°C (68°F)
        2(HT)-3(E) 10 kΩ or higher

        If the result is not as specified, replace the heated oxygen sensor,

        Fig 14: Measuring Resistance Between Terminals
        G02678428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the resistance. (Bank 1 Sensor 2)
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        TESTER CONNECTION AND SPECIFIED CONDITION (4 OF 4)

        Tester Connection Specified Condition
        1(+B)-2(HT) 11 to 16 Ω at 20°C (68°F)
        2(HT)-3(E) 10 kΩ or higher

        If the result is not as specified, replace the heated oxygen sensor.

        Fig 15: Measuring Resistance Between Terminals
        G02678429Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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