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Emission Control System (3MZ-FE): Inspection

  1. 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 harmful.
        Fig 1: Checking Ventilation Valve Operation
        G02597018Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Blow air into the intake manifold side, and check that air passes through with difficulty.

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

    3. Remove the hose from the ventilation valve.
      Fig 2: Blowing Air Into Intake Manifold Side
      G02597019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT FUEL TANK CAP ASSY 
    1. Visually check if the cap and/or gasket are deformed or damaged.

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

    Fig 3: Locating Gasket
    G02597020Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT CHARCOAL CANISTER ASSY 
    1. Visually check the charcoal canister for cracks or damage.

      If cracks or damage is found, replace the charcoal canister assy.

      Fig 4: Locating Charcoal Canister Bolts
      G02597021Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the charcoal canister operation.
      1. While holding the purge port closed, blow air (0.39 kPa, 4.0 gf/cm2 , 0.06 psi) 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
        G02597022Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. While holding the air inlet port closed, blow air (0.39 kPa, 4.0 gf/cm2 , 0.06 psi) into the vent port, and check that air flows from the purge port.

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

        Fig 6: Identifying Air Inlet Port
        G02597023Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. While holding the air inlet port closed, apply vacuum (3.43 kPa, 25.7 gf/cm2 , 1.01 psi) to the vent port, and check that air is sucked in from the purge port.

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

      Fig 7: Holding Air Inlet Port
      G02597024Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check air tightness.
      1. While holding the vent and air inlet ports closed, apply vacuum (3.43 kPa, 25.7 gf/cm2 , 1.01 psi) to the purge port, and check that the vacuum is maintained for 1 minute.

      HINT:

      In order to maintain air tightness, the check should be performed while holding the CCV terminal port closed.

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

      Fig 8: Locating Air Inlet Port
      G02597025Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Check the diaphragm.
      1. Remove the air hose between ports A and B.
      2. While holding the vent, purge and air inlet ports closed, apply vacuum (1.42 kPa, 11 mmHg, 0.42 in.Hg) into port A, and check that air is sucked in from port B.
        Fig 9: Removing Air Hose Between Ports A And B
        G02597026Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. While holding the vent, purge and air inlet ports closed, apply vacuum (1.42 kPa, 11 mmHg, 0.42 in.Hg) into port A, and measure how long it takes for vacuum to drop.

        Vacuum drop time: 10 seconds or more 

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

      4. Reinstall the air hose between ports A and B.
      Fig 10: Locating Vent Port
      G02597027Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Measure the VSV resistance for CCV between the terminals.

      Standard: 

      CONDITION SPECIFIED CONDITION

      Condition Specified Condition
      20° C (68° F) 25 to 30 Ω
      100° C(212° F) 32 to 40 Ω

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

      Fig 11: Measuring VSV Resistance For CCV Between Terminals
      G02597028Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Check VSV operation for CCV.
      1. Check that air flows from port A to ports B and C.

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

        Fig 12: Checking VSV Operation For CCV
        G02597029Courtesy 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 charcoal canister assy.

        Fig 13: Applying Battery Positive Voltage Across Terminals
        G02597030Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check that air does not flow from port A to port B.
      5. Check that air flows from port A to port C.

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

    Fig 14: Checking Air Flows From Port A To Port C
    G02597031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT VACUUM SWITCHING VALVE ASSY FOR EVAP 
    1. Measure the VSV resistance.

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

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

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

      Fig 15: Measuring VSV Resistance
      G02597032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check VSV operation.
      1. Check that air does not flow from the port as shown in the illustration.

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

        Fig 16: Checking VSV Operation
        G02597033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Apply battery positive voltage across the terminals.
      3. Check that air flows from the port as shown in the illustration.

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

        Fig 17: Applying Battery Positive Voltage Across Terminals
        G02597034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT A/F SENSOR (BANK 1, 2 SENSOR 1) 
    1. Measure the resistance between terminals 1 (HT) and 2 (+B) and 1 (HT) and 4 (AF-).

      Standard: 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      1 (HT) - 2 (+B) 20°C (68°F) 1.8 to 3.4 Ω
      1 (HT) -4 (AF-) - 10 kΩ or higher

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

      Fig 18: Measuring Resistance
      G02597035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT HEATED OXYGEN SENSOR (BANK 1 SENSOR 2) 
    1. Measure the resistance between terminals 1 (HT) and 2 (+B).

      Standard: 

      CONDITION SPECIFIED CONDITION

      Condition Specified Condition
      20° C (68°F) 11 to 16 Ω
      800° C(1,472° F) 23 to 32 Ω

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

      Fig 19: Measuring Resistance
      G02597037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT HEATED OXYGEN SENSOR (BANK 1 SENSOR 2) 
    1. Measure the resistance between terminals 2 (HT) and 2 (+B).

      Standard: 

      CONDITION SPECIFIED CONDITION

      Condition Specified Condition
      20° C (68°F) 11 to 16 Ω
      800° C(1,472° F) 23 to 32 Ω

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

    Fig 20: Measuring Resistance
    G02597038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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