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On-Vehicle Inspection [01/2019 - 11/2022]: Procedure

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  1. INSPECT ENGINE COOLANT 

    Refer to ON-VEHICLE INSPECTION [01/2019 - 11/2022]

  2. INSPECT ENGINE OIL 

    Refer to ON-VEHICLE INSPECTION [01/2019 - 11/2022]

  3. INSPECT BATTERY 

    Refer to ON-VEHICLE INSPECTION [01/2019 - 09/2022] , or refer to ON-VEHICLE INSPECTION [09/2022 - 11/2022]

  4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 

    Refer to REMOVAL [01/2019 - 11/2022]

  5. INSPECT SPARK PLUG 

    Refer to ON-VEHICLE INSPECTION [01/2019 - 11/2022]

  6. INSPECT V-RIBBED BELT 

    See step  1

  7. INSPECT VALVE AND ADJUSTER NOISE 
    1. Rev up the engine several times. Check that the engine does not emit unusual noises.
    2. If unusual noises occur, warm up the engine and idle it for 30 minutes or more, then perform the inspection.

      HINT: 

      If any defects or problems are found during the inspection, perform valve lash adjuster assembly inspection.

      Refer to PROCEDURE - Step 2

  8. INSPECT IGNITION TIMING 
    NOTE:
    • Check the ignition timing with the cooling fan off.
    • Turn off all electrical systems and the A/C.
    • When checking the ignition timing, the transaxle should be in neutral or park.
    1. Warm up and stop the engine.
    2. Connect the Techstream to the DLC3.
    3. Start the engine and run it at idle.
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Data List / IGN Advance.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      IGN Advance

      Standard Ignition Timing

      0 to 14° BTDC at idle

    6. Check that the ignition timing advances immediately when the engine speed is increased.
    7. Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1 / ON.

      Powertrain > Engine and ECT > Active Test 

      Active Test Display
      Connect the TC and TE1
      Data List Display
      IGN Advance
    8. Monitor IGN Advance of the Data List.

      Standard Ignition Timing

      8 to 12° BTDC at idle

      NOTE:

      When checking the ignition timing, the transaxle should be in neutral or park.

  9. INSPECT ENGINE IDLE SPEED 
    NOTE:
    • Turn off all electrical systems and the A/C.
    • Inspect the engine idle speed with the cooling fan off.
    • When checking the engine idle speed, the transaxle should be in neutral or park.
    1. Warm up and stop the engine.
    2. Connect the Techstream to the DLC3.
    3. Start the engine and run it at idle.
    4. Turn the Techstream on.
    5. Enter the following menus: Powertrain / Engine and ECT / Data List / Engine Speed.

      Powertrain > Engine and ECT > Data List 

      Tester Display
      Engine Speed
    6. Read the value displayed on the Techstream.

      Standard Idle Speed

      for CVT 

      700 to 800 rpm

      for Manual Transaxle 

      600 to 700 rpm

  10. INSPECT COMPRESSION 
    NOTE:

    Keep the spark plug holes free of foreign matter when measuring the compression pressure.

    1. Warm up and stop the engine.
    2. Check for DTCs.

      Refer to DTC CHECK / CLEAR [01/2019 - 03/2019] , or refer to DTC CHECK / CLEAR [03/2019 - 09/2022] , or refer to DTC CHECK / CLEAR [09/2022 - 11/2022]

    3. Remove the 4 spark plugs.

      Refer to REMOVAL [01/2019 - 11/2022]

    4. Disconnect the 4 fuel injector connectors.
      NOTE:

      Disable fuel injection in order to prevent catalyst damage due to unburned gasoline.

    5. Remove the air cleaner cap with air cleaner hose.

      Refer to PROCEDURE - Step 2

    6. w/ Stud Bolt:
      GTY862095Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/ Stud Bolt
      *B w/o Stud Bolt
      1. Remove the 2 bolts, 2 nuts and separate the throttle body assembly from the intake manifold.
    7. w/o Stud Bolt:
      1. Remove the 4 bolts and separate the throttle body assembly from the intake manifold.
    8. Check the cylinder compression pressure.
      1. Insert a compression gauge into the spark plug hole.
        GTY849380Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. While cranking the engine, measure the compression pressure.

        Standard Compression Pressure

        1373 kPa (14.0 kgf/cm2 , 199 psi)

        Minimum Compression Pressure

        980 kPa (10.0 kgf/cm2 , 142 psi)

        Pressure Difference between Each Cylinder

        100 kPa (1.0 kgf/cm2 , 15 psi)

        NOTE:
        • Use a fully-charged battery so that the engine speed can be increased to 250 rpm or more.
        • Inspect the other cylinders in the same way.
        • Measure the compression pressure as quickly as possible.
      3. If the cylinder compression pressure is low, pour a small amount of engine oil into the cylinder through the spark plug hole and inspect it again.

        HINT: 

        • If adding engine oil increases the compression pressure, the piston rings and/or cylinder bore may be worn or damaged.
        • If the compression pressure stays low, a valve may be stuck or seated improperly, or there may be leaks in the cylinder head gasket.
    9. w/ Stud Bolt:
      1. Install a new throttle body gasket and the throttle body assembly to the intake manifold with the 2 bolts and 2 nuts.

        Torque: 10 N.m (102 kgf/cm, 7 ft.lbf) 

        NOTE:

        If the throttle body assembly has been struck or dropped, replace it.

    10. w/o Stud Bolt:
      1. Install a new throttle body gasket and the throttle body assembly to the intake manifold with the 4 bolts.

        Torque: 10 N.m (102 kgf/cm, 7 ft.lbf) 

        NOTE:

        If the throttle body assembly has been struck or dropped, replace it.

    11. Install the air cleaner cap with air cleaner hose.

      Refer to PROCEDURE - Step 3

    12. Connect the 4 fuel injector connectors.
    13. Install the 4 spark plugs.

      Refer to INSTALLATION [01/2019 - 11/2022]

    14. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [01/2019 - 03/2019] , or refer to DTC CHECK / CLEAR [03/2019 - 09/2022] , or refer to DTC CHECK / CLEAR [09/2022 - 11/2022]

      NOTE:

      After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.

  11. INSPECT CO/HC 

    HINT: 

    This check determines whether or not the idle CO/HC complies with regulations.

    1. Start the engine.
    2. Keep the engine at 2500 rpm for approximately 180 seconds.
    3. Insert a CO/HC meter testing probe at least 40 cm (1.3 ft.) into the tailpipe during idle.
    4. Immediately check the CO/HC concentration during idle and when the engine is running at 2500 rpm.

      HINT: 

      When doing a 2 mode (with the engine idling/running at 2500 rpm) test, the measurement procedures are determined by applicable local regulations.

      If the CO/HC concentration does not comply with the regulations, perform troubleshooting in the order given below.

      1. Check for DTCs.

        Refer to DTC CHECK / CLEAR [01/2019 - 03/2019] , or refer to DTC CHECK / CLEAR [03/2019 - 09/2022] , or refer to DTC CHECK / CLEAR [09/2022 - 11/2022]

      2. See the following table for possible causes, then inspect the applicable parts and repair them if necessary.
        CO HC Problem Possible Cause
        Normal High Rough idle
        1. Faulty ignition:
          • Incorrect timing
          • Fouled, shorted or improperly gapped plugs
        2. Incorrect valve clearance
        3. Leaks in intake or exhaust valves
        4. Leaks in cylinders
        Low High Rough idle (Fluctuating HC reading)
        1. Vacuum leaks:
          • Ventilation hose
          • Intake manifold
          • Throttle body assembly
          • Brake booster line
        2. Lean mixture causing misfire
        High High Rough idle (Black smoke from exhaust)
        1. Restricted air cleaner filter element sub-assembly
        2. Plugged PCV valve
        3. Faulty EFI systems:
          • Pressure regulator
          • Engine coolant temperature sensor
          • Mass air flow meter sub-assembly
          • ECM
          • Injector assemblies
          • Throttle body assembly
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