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Home >> Toyota >> 2020 >> Corolla L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 24 (Engine Mechanical System (M20A-FKS) - Service Information (1 Of 6)) >> Engine >> On-Vehicle Inspection [01/2019 - 09/2022] >> Procedure

On-Vehicle Inspection [01/2019 - 09/2022]: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. INSPECT ENGINE COOLANT 

    Refer to ON-VEHICLE INSPECTION [06/2018 - 09/2019] , or refer to ON-VEHICLE INSPECTION [09/2019 - ]

  2. INSPECT ENGINE OIL 

    Refer to ON-VEHICLE INSPECTION [06/2018 - 08/2023]

  3. INSPECT BATTERY CONDITION 

    Refer to ON-VEHICLE INSPECTION [06/2018 - 09/2022]

  4. INSPECT SPARK PLUG 

    Refer to ON-VEHICLE INSPECTION [06/2018 - ]

  5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 

    Refer to PROCEDURE - Step 3

  6. INSPECT V-RIBBED BELT 

    See step  1

  7. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY 
    1. Remove the V-ribbed belt.

      Refer to REMOVAL [01/2019 - ]

    2. Turn the V-ribbed belt tensioner assembly clockwise and counterclockwise and check that it turns smoothly and does not catch.

      HINT: 

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

    3. Install the V-ribbed belt.

      Refer to INSTALLATION [01/2019 - ]

  8. INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE 
    1. Rev up the engine several times. Check that the engine does not emit unusual noises.
    2. If tappet noise is heard, perform the following procedure.
      1. Idle the engine for at least 10 minutes and then stop the engine.
      2. Remove the fuel pump assembly (for High Pressure).

        Refer to REMOVAL [01/2019 - 03/2019] , or refer to REMOVAL [03/2019 - 09/2022]

      3. Remove the ignition coil assembly.

        Refer to REMOVAL [06/2018 - ]

      4. Remove the camshaft position sensor (for Intake Side).

        Refer to PROCEDURE - Step 1

      5. Remove the camshaft position sensor (for Exhaust Side).

        Refer to PROCEDURE - Step 2

      6. Disconnect the air fuel ratio sensor connector.
        GTY1142326Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      7. Disengage the 3 clamps.
      8. Remove the cylinder head cover sub-assembly.

        Refer to PROCEDURE - Step 18

      9. Push the pivot of the No. 1 valve rocker arm sub-assembly.
        GTY1158179Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *1 No. 1 Valve Rocker Arm Sub-assembly
        *2 Valve Lash Adjuster Assembly
        *3 Valve Stem Cap
        *a Pivot
        Push

        OK

        The plunger is very difficult to move.

        HINT: 

        If the plunger is easy to move, replace the valve lash adjuster assembly.

      10. Install the cylinder head cover sub-assembly.

        Refer to PROCEDURE - Step 45

      11. Engage the 3 clamps.
      12. Connect the air fuel ratio sensor connector.
      13. Connect the camshaft position sensor (for Exhaust Side) connector.
      14. Connect the camshaft position sensor (for Intake Side) connector.
      15. Install the ignition coil assembly.

        Refer to INSTALLATION [06/2018 - ]

      16. Install the fuel pump assembly (for High Pressure).

        Refer to INSTALLATION [06/2018 - 09/2022]

  9. 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 / Data List / Ignition Timing Cylinder #1.

      Powertrain > Engine > Data List 

      Tester Display
      Ignition Timing Cylinder #1

      Standard Ignition Timing

      for CVT: -3 to 3° BTDC at idle

      for Manual Transaxle: 3 to 9° BTDC at idle

    6. Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / ON.

      Powertrain > Engine > Active Test 

      Active Test Display
      Activate the TC Terminal
      Data List Display
      Ignition Timing Cylinder #1
    7. Monitor Ignition Timing Cylinder #1 of the Data List.

      Standard Ignition Timing

      8 to 12° BTDC at idle

    8. Enter the following menus: Powertrain / Engine / Active Test / Activate the TC Terminal / OFF.
    9. Check that the ignition timing advances immediately when the engine speed is increased.
  10. INSPECT ENGINE IDLE SPEED 
    NOTE:
    • Check the engine idle speed with the cooling fan off.
    • Turn off all electrical systems and the A/C.
    • 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 / Data List / Engine Speed.

      Powertrain > Engine > Data List 

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

      Standard Idle Speed

      for CVT 

      750 to 850 rpm

      for Manual Transaxle 

      600 to 700 rpm

  11. 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 [06/2018 - 09/2022]

    3. Remove the 4 spark plugs.

      Refer to REMOVAL [06/2018 - ]

    4. Disconnect the fuel injector connector (for Port Injection).
      GTY801472Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    5. Remove the radiator support opening cover.
    6. Remove the inlet No. 1 air cleaner.

      Refer to PROCEDURE - Step 5 [06/2018 - 09/2019] , or refer to PROCEDURE - Step 6 [09/2019 - 09/2022]

    7. Remove the 2 bolts and disengage the clamp to separate the engine wire.
      GTY801635Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Remove the No. 1 engine under cover assembly.

      Refer to PROCEDURE - Step 9 [01/2019 - 03/2019] , or refer to PROCEDURE - Step 9 [03/2019 - 09/2019] , or refer to PROCEDURE - Step 9 [09/2019 - 06/2021] , or refer to PROCEDURE - Step 9 [06/2021 - 09/2022]

    9. Disconnect the fuel injector connector (for Direct Injection).
      GTY801474Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    10. Remove the air cleaner cap with air cleaner hose.

      Refer to PROCEDURE - Step 2 [06/2018 - 09/2019] , or refer to PROCEDURE - Step 3 [09/2019 - ]

    11. Using an 8 mm socket wrench, remove the 3 bolts to separate the throttle body with motor assembly from the intake manifold.
      GTY872551Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    12. Check the cylinder compression pressure.
      GTY801473Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Insert a compression gauge into the spark plug hole.
      2. While cranking the engine, measure the compression pressure.

        Standard Compression Pressure

        1400 kPa (14.3 kgf/cm 2 , 203 psi)

        Minimum Compression Pressure

        1200 kPa (12.2 kgf/cm 2 , 174 psi)

        Pressure Difference between Each Cylinder

        200 kPa (2.0 kgf/cm 2 , 29 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.
      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 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.
    13. Using an 8 mm socket wrench, install the throttle body with motor assembly to the intake manifold with the 3 bolts.

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

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

      Refer to PROCEDURE - Step 3 [06/2018 - 09/2019] , or refer to PROCEDURE - Step 3 [09/2019 - 11/2022]

    15. Connect the fuel injector connector (for Direct Injection).
      GTY801480Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    16. Install the No. 1 engine under cover assembly.

      Refer to PROCEDURE - Step 82 [01/2019 - 03/2019] , or refer to PROCEDURE - Step 82 [03/2019 - 09/2019] , or refer to PROCEDURE - Step 85 [09/2019 - 06/2021] , or refer to PROCEDURE - Step 85 [06/2021 - 09/2022]

    17. Engage the clamp and install the engine wire with the 2 bolts.

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

    18. Install the inlet No. 1 air cleaner.

      Refer to PROCEDURE - Step 11 [06/2018 - 09/2019] , or refer to PROCEDURE - Step 11 [09/2019 - 11/2022]

    19. Install the radiator support opening cover.
    20. Connect the fuel injector connector (for Port Injection).
    21. Install the 4 spark plugs.

      Refer to INSTALLATION [06/2018 - ]

    22. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [06/2018 - 09/2022]

      NOTE:

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

  12. INSPECT CO/HC 

    HINT: 

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

    1. Start the engine.
    2. Run the engine 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 during idle.
    4. Immediately check the CO/HC concentration during idle and when the engine is running at 2500 rpm.

      HINT: 

      When performing 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 [06/2018 - 09/2022]

      2. See the following table for possible causes, then inspect the applicable parts and repair them if necessary.
        CO HC Problem Cause
        Normal High Rough idle
        1. Faulty ignition:
          • Incorrect valve timing
          • Fouled, shorted or improperly gapped spark plugs
        2. Incorrect valve clearance (valve lash adjuster assembly)
        3. Leaks in intake or exhaust valves
        4. Leaks in cylinders
        5. Faulty EGR
        Low High Rough idle (Fluctuating HC reading)
        1. Vacuum leaks:
          • PCV hoses
          • Intake manifold
          • Throttle body with motor assembly
        2. Lean mixture causing misfire
        3. Faulty EGR
        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
          • Mass air flow meter
          • ECM
          • Fuel injector assemblies
          • Throttle position sensor (built into throttle body with motor assembly)
        4. Faulty EGR
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