LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2020 >> LS 500h AWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical System - Service Information (1 Of 5) >> Engine >> On-Vehicle Inspection [10/2017 - 10/2020] >> Procedure

On-Vehicle Inspection [10/2017 - 10/2020]: Procedure

  1. INSPECT ENGINE COOLANT (for Engine) 

    Refer to ON-VEHICLE INSPECTION [10/2017 - ]

  2. INSPECT ENGINE OIL 

    Refer to ON-VEHICLE INSPECTION [10/2017 - 10/2023]

  3. INSPECT AUXILIARY BATTERY 

    Refer to ON-VEHICLE INSPECTION [10/2017 - 10/2020]

  4. INSPECT SPARK PLUG 

    Refer to ON-VEHICLE INSPECTION [10/2017 - ]

  5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Remove the air cleaner filter element sub-assembly.
    2. Visually check that there is no dirt, blockage, and/or damage to the air cleaner filter element sub-assembly.

      HINT: 

      • If there is any dirt or a blockage in the air cleaner filter element sub-assembly, clean it with compressed air.
      • If any dirt or a blockage remains even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it.
    3. Install the air cleaner filter element sub-assembly.
  6. INSPECT V-RIBBED BELT 

    See step  1

  7. INSPECT VALVE LASH ADJUSTER NOISE 
    1. Put the engine in inspection mode.

      Refer to INSPECTION MODE PROCEDURE [10/2017 - ]

    2. Rev up the engine several times. Check that the engine does not emit unusual noises.

      If unusual noises occur, warm up the engine and idle it for over 30 minutes. Then perform the inspection above again.

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

  8. INSPECT IGNITION TIMING 
    NOTE:
    • Check the ignition timing with the cooling fans off.
    • Turn off all the electrical systems and the A/C.
    • When checking the ignition timing, the transmission should be in park.
    1. Put the engine in inspection mode.

      Refer to INSPECTION MODE PROCEDURE [10/2017 - ]

    2. Warm up the engine and stop the engine.
      NOTE:

      A warmed up engine should have an engine coolant temperature of over 80°C (176°F), and an engine oil temperature of 60°C (140°F), and the engine speed should be stabilized.

    3. When using the Techstream:
      1. Connect the Techstream to the DLC3.
      2. Put the engine in inspection mode.

        Refer to INSPECTION MODE PROCEDURE [10/2017 - ]

      3. 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

        7 to 24° BTDC at idle

      4. Check that the ignition timing advances immediately when the engine speed is increased.
      5. 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
      6. Monitor Ignition Timing Cylinder #1 of the Data List.

        Standard ignition timing

        8 to 12° BTDC at idle

    4. When not using the Techstream:
      1. Remove the V-bank cover sub-assembly.
      2. Connect the tester probe of a timing light to the wire of the ignition connector for No. 1 cylinder.
        NOTE:

        Use a timing light which can detect the primary signal.

      3. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.
        • SST: 09843-18040 
        GTY613539Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Front view of DLC3
        NOTE:
        • Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.
        • When checking the ignition timing, the transmission should be in neutral.
      4. Using a timing light, check the ignition timing.

        Standard ignition timing

        8 to 12° BTDC at idle

      5. Remove SST from the DLC3.
      6. Check the ignition timing.

        Standard ignition timing

        7 to 24° BTDC at idle

      7. Check that the ignition timing advances immediately when the engine speed is increased.
      8. Disconnect the timing light from the engine.
      9. Install the V-bank cover sub-assembly.
  9. INSPECT ENGINE IDLE SPEED 
    NOTE:
    • Check the idle speed with the cooling fans off.
    • Turn off all the electrical systems and the A/C.
    • When checking the idle speed, the transmission should be in park.
    1. Put the engine in inspection mode.

      Refer to INSPECTION MODE PROCEDURE [10/2017 - ]

    2. Warm up and stop the engine.
      NOTE:

      A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine speed should be stabilized.

    3. When using the Techstream:
      1. Connect the Techstream to the DLC3.
      2. Put the engine in inspection mode.

        Refer to INSPECTION MODE PROCEDURE [10/2017 - ]

      3. Enter the following menus: powertrain / Engine / Data list / Engine Speed.

        Powertrain > Engine > Data List 

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

        Standard idle speed

        950 to 1050 rpm

      5. Disconnect the Techstream from the DLC3.
    4. When not using the Techstream:
      1. Using SST, connect the tachometer probe to terminal 9 (TAC) of the DLC3.
        GTY672719Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
        *a Front view of DLC3
        • SST: 09843-18030 
        NOTE:

        Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.

      2. Put the engine in inspection mode.

        Refer to INSPECTION MODE PROCEDURE [10/2017 - ]

      3. Check the idle speed.

        Standard idle speed

        950 to 1050 rpm

      4. Turn the power switch off.
      5. Disconnect the tachometer from the DLC3.
  10. INSPECT COMPRESSION 
    NOTE:

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

    1. Put the engine in inspection mode.

      Refer to INSPECTION MODE PROCEDURE [10/2017 - ]

    2. Warm up and stop the engine.
      NOTE:

      A warmed up engine should have an engine coolant temperature of over 80°C (176°F) and an engine oil temperature of 60°C (140°F), and the engine speed should be stabilized.

    3. Connect the Techstream to the DLC3.
    4. Check for DTCs.

      Refer to DTC CHECK / CLEAR [10/2017 - 10/2020]

    5. Remove intake air surge tank assembly.

      Refer to PROCEDURE - Step 3

    6. Remove the 6 ignition coils.

      Refer to PROCEDURE - Step 8

    7. Remove the 6 spark plugs.

      Refer to PROCEDURE - Step 9

    8. Insert a compression gauge into the spark plug hole.
    9. Turn the power switch on (IG).
    10. Turn the Techstream on.
      NOTE:

      Check the HV battery voltage in the Data List to ensure that the battery is fully charged.

    11. Enter the following menus: Powertrain / Hybrid Control / Active Test / Compression Test / ON.

      Powertrain > Hybrid Control > Active Test 

      Tester Display
      Compression Test
    12. Depress and hold the brake pedal, and turn the power switch on (READY). Then check the compression pressure.

      Standard Compression Pressure

      750 kPa (7.6 kgf/cm2 , 109 psi)

      Minimum Compression Pressure

      550 kPa (5.6 kgf/cm2 , 80 psi)

      Pressure Difference between Each Cylinder

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

      NOTE:
      • Inspect all cylinders in the same way.
      • Measure the compression pressure as quickly as possible.
      • Noise may be emitted from the hybrid vehicle transaxle assembly. However, this is not a malfunction.
    13. 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.
    14. Install the 6 spark plugs.

      Refer to PROCEDURE - Step 1

    15. Install the 6 ignition coils.

      Refer to PROCEDURE - Step 2

    16. Install the intake air surge tank assembly.

      Refer to PROCEDURE - Step 11

    17. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [10/2017 - 10/2020]

      NOTE:

      After performing the inspection, clear the DTCs and confirm that DTCs are not stored again or that the normal system code is output if using a check wire.

  11. INSPECT CO/HC 

    HINT: 

    This is a check for determining whether or not the idle CO / HC complies with regulations.

    1. Put the engine in inspection mode.

      Refer to INSPECTION MODE PROCEDURE [10/2017 - ]

    2. Keep the engine speed at 2500 rpm for approx. 180 seconds.
    3. Insert the CO / HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe during idling.
    4. Immediately check CO / HC concentration at idle and/or 2500 rpm.

      HINT: 

      • When performing the 2 mode (2500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
      • If the CO / HC concentration does not comply with regulations, troubleshoot in the order given below.
      1. Check the DTCs.

        Refer to DTC CHECK / CLEAR [10/2017 - 10/2020]

      2. See the table below for possible causes, then inspect and correct the applicable causes if necessary.
        CO HC Symptom Causes
        Normal High Rough idle
        1. Faulty ignitions
          • Incorrect timing
          • Fouled, shorted or improperly gapped plugs
        2. Incorrect valve clearance (valve lash adjuster assembly)
        3. Leaky intake and exhaust valves
        4. Leaky cylinder
        5. Faulty EGR
        Low High Rough idle
        (Fluctuating HC reading)
        1. Vacuum leaks
          • PCV hose
          • 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 filter
        2. Faulty fuel SFI system
          • Faulty fuel pressure
          • Defective engine coolant temperature sensor
          • Faulty ECM
          • Faulty fuel injector assembly
          • Faulty throttle position sensor (built into throttle with motor body assembly)
          • Faulty mass air flow meter
        3. Faulty EGR
scientia non olet · About LEMON Manuals