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On-Vehicle Inspection [09/2020 - ]: Procedure

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  1. INSPECT ENGINE COOLANT 

    Refer to ON-VEHICLE INSPECTION [08/2015 - ]

  2. INSPECT ENGINE OIL 

    Refer to ON-VEHICLE INSPECTION [08/2015 - 10/2023] , or refer to ON-VEHICLE INSPECTION [10/2023 - ]

  3. CHECK BATTERY CONDITION 

    Refer to ON-VEHICLE INSPECTION [08/2015 - ]

  4. INSPECT SPARK PLUG 

    Refer to ON-VEHICLE INSPECTION [08/2015 - ]

  5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Remove the air cleaner filter element sub-assembly.
    2. Visually check that the air cleaner filter element sub-assembly is not excessively damaged or oily.

      HINT: 

      • If there is any dirt or clogs in the air cleaner filter element sub-assembly, clean it with compressed air.
      • If any dirt or clogs remain even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it.
      • If necessary, replace the air cleaner filter element sub-assembly.
    3. Install the air cleaner filter element sub-assembly.
  6. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY 
    1. Remove the V-ribbed belt.

      Refer to REMOVAL [08/2015 - ] 

    2. Check that the V-ribbed belt tensioner assembly turns smoothly by turning it clockwise and counterclockwise.

      HINT: 

      If the V-ribbed belt tensioner assembly does not turn smoothly, replace the V-ribbed belt tensioner assembly.

    3. Install the V-ribbed belt.

      Refer to INSTALLATION [08/2015 - ] 

  7. INSPECT VALVE LASH ADJUSTER ASSEMBLY 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 
    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 > Data List 

      Tester Display
      Ignition Timing Cylinder #1

      Standard Ignition Timing

      5 to 20° BTDC at idle

      NOTE:
      • Check the ignition timing with the cooling fans off.
      • Turn off all electrical systems and the A/C.
      • When checking the ignition timing, the transaxle should be in neutral or park.
    6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1 / ON.

      Powertrain > Engine > Active Test 

      Tester Display
      Activate the TC Terminal
    7. Monitor IGN Advance of the Data List.

      Standard Ignition Timing

      8 to 12° BTDC at idle

    8. Enter the following menus: Connect the TC and TE1 / OFF.
    9. Check that the ignition timing advances immediately when the engine speed is increased.
  9. INSPECT ENGINE IDLE SPEED 
    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 > Data List 

      Tester Display
      Engine Speed
    6. Inspect the engine idle speed.

      Standard Idle Speed

      750 to 850 rpm

      NOTE:
      • Check the engine idle speed with the cooling fans off.
      • Turn off all electrical systems and the A/C.
      • When checking the engine idle speed, the transaxle should be in neutral or park.
  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 [08/2015 - ]

    3. Remove the engine under cover.

      See step  11

    4. Remove the 4 spark plugs.

      Refer to REMOVAL [08/2015 - ]

    5. Disconnect the fuel injector connector (for Port Injection).
      GTY619622Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Disconnect the fuel injector connector (for Direct Injection).
      GTY619629Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    7. Check the cylinder compression pressure.
      1. Insert a compression gauge into the spark plug hole.
      2. Fully open the throttle.
      3. While cranking the engine, measure the compression pressure.

        Standard Compression Pressure

        1200 kPa (12.2 kgf/cm2 , 174 psi)

        Minimum Compression Pressure

        900 kPa (9.2 kgf/cm2 , 131 psi)

        Pressure Difference between each Cylinder

        100 kPa (1.0 kgf/cm2 , 15 psi) or less

        NOTE:
        • Always use a fully charged battery to obtain an engine speed of 250 rpm or more.
        • Inspect all cylinders in the same way.
        • Measure the compression pressure as quickly as possible.
      4. If the cylinder compression pressure is low, pour a small amount of engine oil into the cylinder through the spark plug hole, then inspect it again.

        HINT: 

        • If adding 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.
    8. Connect the fuel injector connector (for Direct Injection).
    9. Connect the fuel injector connector (for Port Injection).
    10. Install the 4 spark plugs.

      Refer to INSTALLATION [08/2015 - ]

    11. Install the engine under cover.

      Refer to PROCEDURE - Step 78

    12. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [08/2015 - ]

      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 the idle CO/HC complies with regulations.

    1. Start the engine.
    2. Keep the engine speed at 2500 rpm for approximately 180 seconds.
    3. Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe while idling.
    4. Immediately check the CO/HC concentration while idling and when the engine is running at 2500 rpm.

      HINT: 

      • When performing the 2 mode test (2500 rpm and idle), the measurement procedures are determined by applicable local regulations.
      • If the CO/HC concentration does not comply with the regulations, perform troubleshooting in the following order.
      1. Check for DTCs.

        Refer to DTC CHECK / CLEAR [08/2015 - ]

      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 spark 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:
          • PCV hoses
          • Intake manifold
          • Throttle with motor 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 SFI systems:
          • Fuel pressure regulator assembly
          • Engine coolant temperature sensor
          • ECM
          • Fuel injector assemblies
          • Throttle body assembly
          • Mass air flow meter sub-assembly
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