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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Engine Mechanical >> Auxiliary Emission Control Systems >> Emission Control System (2GR-FKS) - Inspection >> Emission Control System >> On-Vehicle Inspection [12/2019 - 10/2022] >> Procedure

On-Vehicle Inspection [12/2019 - 10/2022]: Procedure

  1. INSPECT FUEL CUT OPERATION 
    WARNING:

    To prevent injury due to contact with an operating V-ribbed belt or cooling fan, keep your hands and clothing away from the V-ribbed belt and cooling fans when working in the engine compartment with the engine running or the ignition switch ON.

    1. Start the engine.
    2. Warm up the engine.
    3. Increase the engine speed to approximately 3500 rpm.
    4. Use a sound scope to check for fuel injector assembly operating sounds.
    5. When the accelerator pedal is fully released, check that fuel injector assembly operating sounds stop momentarily and then resume.

      Standard

      Item Specified Condition
      Fuel cut permission engine speed 2500 rpm or higher
      Fuel injection restart engine speed 1400 rpm

      If the result is not as specified, check the fuel injector assemblies, wire harness and ECM.

  2. VISUALLY CHECK HOSES, CONNECTIONS AND GASKETS 
    1. Visually check that the hoses, connections and gaskets have no cracks, leaks or damage.
      NOTE:
      • Detachment or other problems with the engine oil level dipstick, oil filler cap sub-assembly, ventilation hose or other components may cause the engine to run improperly.
      • Air suction caused by disconnections, looseness or cracks in any part of the air induction system between the throttle body with motor assembly and cylinder head sub-assembly will cause engine failure or engine malfunctions.

      If any defects are found, replace parts as necessary.

  3. INSPECT EVAPORATIVE EMISSION CONTROL SYSTEM 
    WARNING:

    To prevent injury due to contact with an operating V-ribbed belt or cooling fan, keep your hands and clothing away from the V-ribbed belt and cooling fans when working in the engine compartment with the engine running or the ignition switch ON.

    1. Start the engine.
    2. Slide the clip and disconnect the fuel vapor feed hose from the purge valve (purge VSV).
      GTY885912Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check that vacuum occurs at the purge valve (purge VSV) port.

      Powertrain > Engine > Active Test 

      Tester Display
      Activate the EVAP Purge VSV
    4. If vacuum does not occur, check the following items.
      • Purge valve (purge VSV)
      • Clogging in the No. 1 fuel vapor feed hose that connects the intake air surge tank assembly and purge valve (purge VSV)
      • Voltage from the ECM PRG terminal

        Refer to TERMINALS OF ECM [12/2019 - 10/2022]

    5. Exit Active Test mode and connect the fuel vapor feed hose to the purge valve (purge VSV) and slide the clip to secure it.

      If the result is not as specified, replace the purge valve (purge VSV), wire harness or ECM.

      Refer to PROCEDURE - Step 1

    6. Warm up the engine and drive the vehicle.
    7. Confirm that the purge valve (purge VSV) opens.

      Powertrain > Engine > Data List 

      Tester Display
      EVAP (Purge) VSV

      If the result is not as specified, replace the purge valve (purge VSV), wire harness or ECM.

  4. CHECK FUEL TANK AND VENT LINE 
    1. Remove the front floor cover LH.

      Refer to PROCEDURE - Step 3

    2. Disconnect the fuel tank evaporation vent tube sub-assembly from the canister (charcoal canister assembly).
      GTY870969Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Fuel Tank Cap Assembly *2 Fuel Tank Evaporation Vent Tube Sub-assembly
      *a Pressure Gauge - -
    3. Connect a pressure gauge to the fuel tank evaporation vent tube sub-assembly.
    4. Apply 4 kPa (0.04 kgf/cm2 , 0.6 psi) of pressure to the vent line of the fuel tank assembly.

      HINT: 

      Perform this inspection with the fuel tank assembly less than 90% full. When the fuel tank assembly is full, the fuel fill check valve closes and the pressure is released through the 2 mm (0.0787 in.) orifice. As a result, when the fuel tank cap assembly is removed, the pressure does not decrease smoothly.

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

      HINT: 

      If the pressure decreases immediately, one of the following may apply:

      • The fuel tank cap assembly is not completely tightened.
      • The fuel tank cap assembly is damaged.
      • Air is leaking from the vent line.
      • The fuel tank assembly is damaged.
    6. Remove the fuel tank cap assembly and check that the pressure is released smoothly.

      If the pressure is not released smoothly, replace the fuel tank assembly.

    7. Connect the fuel tank evaporation vent tube sub-assembly to the canister (charcoal canister assembly).
    8. Install the front floor cover LH.

      Refer to PROCEDURE - Step 13

  5. INSPECT AIR LINE 
    1. Disconnect the No. 7 fuel tank breather tube from the leak detection pump sub-assembly.
      GTY887902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 No. 7 Fuel Tank Breather Tube
      *a Air
    2. Check that air flows freely into the air line.

      If air does not flow freely into the air line, repair or replace the No. 7 fuel tank breather tube.

    3. Connect the No. 7 fuel tank breather tube to the leak detection pump sub-assembly.
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