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Home >> Toyota >> 2009 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (Emission Control System (1AR-FE)) >> Emission Control System >> On-Vehicle Inspection

On-Vehicle Inspection

WARNING: This page is about a different variant/trim than selected.
  1. CHECK FUEL CUT-OFF RPM 
    1. Increase the engine speed to at least 3500 rpm.
    2. Use a sound scope to check for injector operating noise.
    3. Check that the operating sounds stop momentarily and then resume when the accelerator pedal is released.

      HINT:

      Measure with the A/C off.

      Fuel return rpm: 

      1400 rpm 

      Fig 1: Checking Fuel Cut-Off RPM
      G05998645Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. VISUALLY INSPECT HOSES, CONNECTIONS AND GASKET 
    1. Visually check that the hoses, connections and gaskets have no cracks, leaks or damage.
    NOTE:
    • Detachment or other problems with the engine oil dipstick, filler cap, PCV hose and other components may cause the engine to run improperly.
    • Disconnection, looseness or cracks in the parts of the air induction system between the throttle body and cylinder head will allow air suction and cause an engine failure or engine malfunctions.

    If the result is not as specified, replace parts as necessary.

    Fig 2: Inspecting Hoses, Connections And Gasket
    G05998646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM 
    1. Start the engine.
    2. Disconnect the vacuum hose.
    3. Connect the Techstream to the DLC3.
    4. Turn the ignition switch to ON.
    5. Turn the Techstream on.
    6. Enter the following menus: Powertrain/Engine/Active Test/Activate the VSV for Evap Control.
    7. Check that vacuum occurs at the VSV port.
    8. Exit Active Test mode and reconnect the vacuum hose.
    9. Enter the following menus: Powertrain/Engine/Data List/EVAP Purge VSV.
    10. Warm up the engine and drive the vehicle.
    11. Confirm that the purge VSV opens.

      If the result is not as specified, replace the VSV, wire harness or ECM.

      Fig 3: Locating Vacuum Hose Clip
      G06115073Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT FUEL TANK AND VENT LINE 
    Fig 4: Inspecting Fuel Tank And Vent Line
    G06115074Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Disconnect the vent line tube from the canister.
    2. Connect a pressure gauge to the vent line tube.
    3. Apply 4 kPa (0.04 kgf/cm2 , 0.58 psi) of pressure to the vent line of the fuel tank.

      HINT:

      Perform this inspection with the fuel tank less than 90% full. When the fuel tank is full, the fuel cutoff valve closes and pressure is released through the 1.5 mm orifice. As a result, when the fuel tank cap is removed, the pressure does not decrease smoothly.

    4. Check that the fuel tank pressure is maintained for some time, and does not decrease immediately.

      HINT:

      If the pressure decreases immediately, one of the following may be the cause:

      • The fuel tank cap is not completely tightened.
      • The fuel tank cap is damaged.
      • Air is leaking from the vent line.
      • The fuel tank is damaged.
    5. When the fuel tank cap is removed, check that pressure is released smoothly.

      HINT:

      If the pressure does not drop, replace the fuel tank assembly.

    6. Reconnect the vent line tube to the canister.
  5. INSPECT AIR INLET LINE 
    1. Disconnect the air inlet line hose from the charcoal canister.
    2. Check that air flows freely into the air inlet line.

      HINT:

      If air does not flow freely into the air inlet line, repair or replace it.

    3. Reconnect the air inlet line hose to the charcoal canister.
    Fig 5: Inspecting Air Inlet Line
    G06115075Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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