LEMON Manuals: Even more car manuals for everyone
Home >> Lexus >> 2014 >> IS 350 Base, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 64 (Engine Mechanical System (2UR-GSE) - Service Information) >> Engine >> On-Vehicle Inspection [11/2021 - ] >> Procedure

On-Vehicle Inspection [11/2021 - ]: Procedure

WARNING: This page is about a different car, the 2024 Lexus IS 500, 2023 Lexus IS 500, and 2022 Lexus IS 500. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT ENGINE COOLANT 

    Refer to ON-VEHICLE INSPECTION [11/2021 - ]

  2. INSPECT ENGINE OIL 

    Refer to ON-VEHICLE INSPECTION [11/2021 - 10/2023] , or refer to ON-VEHICLE INSPECTION [10/2023 - ]

  3. INSPECT BATTERY 

    Refer to ON-VEHICLE INSPECTION [11/2021 - ]

  4. INSPECT SPARK PLUG 

    Refer to ON-VEHICLE INSPECTION [11/2021 - ]

  5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Remove the air cleaner cap with air cleaner hose.

      Refer to PROCEDURE - Step 6

    2. Remove the air cleaner filter element sub-assembly.
    3. Visually check that the air cleaner filter element sub-assembly is not excessively damaged or oily.

      HINT: 

      • If necessary, replace the air cleaner filter element sub-assembly.
      • 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.
    4. Install the air cleaner filter element sub-assembly.
    5. Install the air cleaner cap with air cleaner hose.

      Refer to PROCEDURE - Step 2

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

      Refer to REMOVAL [11/2021 - ] 

    2. Check that nothing is caught in the V-ribbed belt tensioner assembly by turning it clockwise and counterclockwise.

      HINT: 

      If a malfunction exists, replace the V-ribbed belt tensioner assembly.

    3. Install the V-ribbed belt.

      Refer to INSTALLATION [11/2021 - ] 

  7. INSPECT VALVE CLEARANCE 

    Refer to ON-VEHICLE INSPECTION [11/2021 - ] 

  8. INSPECT IGNITION TIMING 
    1. Warm up and stop the engine.

      HINT: 

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

    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 / IGN Advance.

      Powertrain > Engine > Data List 

      Tester Display
      IGN Advance

      Standard Ignition Timing

      5 to 22° 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 transmission should be in neutral or park.
    6. Check that the ignition timing advances immediately when the engine speed is increased.
    7. Enter the following menus: Powertrain / Engine / Active Test / Connect the TC and TE1 / ON.

      Powertrain > Engine > Active Test 

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

      Standard Ignition Timing

      8 to 12° 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 transmission should be in neutral or park.
  9. INSPECT ENGINE IDLE SPEED 
    1. Warm up and stop the engine.

      HINT: 

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

    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. Inspect the engine idle speed.

      Standard Idle Speed

      700 to 800 rpm

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

      HINT: 

      Refer to the Techstream operator's manual for further details.

      If the idle speed is not as specified, check the air intake system.

  10. INSPECT COMPRESSION 
    1. Warm up and stop the engine.

      HINT: 

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

    2. Disconnect the cable from the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Refer to PRECAUTION [09/2020 - ]

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

      Refer to PROCEDURE - Step 6

    4. Remove the battery.
    5. Remove the 8 spark plugs.

      Refer to REMOVAL [11/2021 - ]

    6. Disconnect the throttle body with motor assembly connector.
    7. Remove the 2 bolts and 2 nuts from the throttle body with motor assembly.
      GTY1084499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    8. Using an E6 "TORX" socket wrench, remove the 2 stud bolts and separate the throttle body with motor assembly and throttle body gasket from the intake air surge tank assembly.
      GTY1084411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    9. Disconnect the 6 injector driver connectors from the 2 injector drivers.
      GTY519235Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Lock Lever
      *b Lock
      *c Connector (with Lock)
    10. Disconnect the 2 injector driver connectors.
    11. Insert a compression gauge into the spark plug hole.
    12. Install the battery.
    13. Connect the cable to the negative (-) battery terminal.
    14. Depress and hold the brake pedal, and turn the engine switch on (IG). Then check the compression pressure.

      Standard Compression Pressure

      1400 kPa (14.3 kgf/cm2 , 203 psi)

      Minimum Compression Pressure

      1000 kPa (10.2 kgf/cm2 , 145 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.
      1. 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 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.
    15. Disconnect the cable from the negative (-) battery terminal.
      NOTE:

      When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

      Refer to PRECAUTION [09/2020 - ]

    16. Remove the battery.
    17. Connect the 2 injector driver connectors.
    18. Connect the 6 injector driver connectors to the 2 injector drivers.
      GTY1084039Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Lock Lever
      *b Connector (with Lock)
    19. Temporarily install a new throttle body gasket and the throttle body with motor assembly to the intake air surge tank assembly with the 2 stud bolts.
    20. Using an E6 "TORX" socket wrench, tighten the 2 stud bolts.

      Torque: 5.0 N.m (51 kgf/cm, 44 in.lbf) 

    21. Install the throttle body gasket and throttle body with motor assembly with the 2 bolts and 2 nuts.

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

    22. Connect the throttle body with motor assembly connector.
    23. Install the 8 spark plugs.

      Refer to INSTALLATION [11/2021 - ]

    24. Install the battery.
    25. Install the air cleaner cap with air cleaner hose.

      Refer to PROCEDURE - Step 2

    26. Connect the cable to the negative (-) battery terminal.
    27. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [11/2021 - ]

      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 during idle.
    4. Check the CO/HC concentration during idle and when the engine is running at 2500 rpm.

      HINT: 

      When performing the 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 following order.

      1. Check the A/F sensor and heated oxygen sensor operation.
      2. Check for DTCs.

        Refer to DATA LIST / ACTIVE TEST [11/2021 - 09/2022] , or refer to DATA LIST / ACTIVE TEST [09/2022 - ]

      3. 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. Leaks in intake or exhaust valves
        3. Leaks in cylinders
        Low High Rough idle
        (Fluctuating HC reading)
        1. Vacuum leaks:
          • PCV hoses
          • Intake manifold
          • Throttle body with motor assembly
        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 system:
          • Incorrect pressure
          • ECT sensor
          • ECM
          • Fuel injector assemblies
          • Throttle position sensor (built into throttle body with motor assembly)
          • MAF sensor
scientia non olet · About LEMON Manuals