Engine On-Vehicle Inspection

Engine. Lexus Gs430, Gs300. Uzs190 Grs190
3Gr-Fse Engine Mechanical. Lexus Gs430, Gs300. Uzs190 Grs190

  1. INSPECT VALVE LASH ADJUSTER NOISE

  2. INSPECT IGNITION TIMING

  3. INSPECT ENGINE IDLE SPEED

  4. INSPECT COMPRESSION

  5. INSPECT CO/HC

Engine -- On-Vehicle Inspection



1. INSPECT VALVE LASH ADJUSTER NOISE

  1. 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 lash adjuster inspection.



2. INSPECT IGNITION TIMING

  1. Warm up the engine and stop the engine.

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


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Mechanical.Engine.Engine On-Vehicle Inspection

  1. When using the intelligent tester:

    1. Connect the intelligent tester to the DLC3.

    2. Start the engine and idle it.

    3. Push the intelligent tester main switch ON.

    4. Enter the following items: Powertrain / Engine and ECT / Data list / IGN Advance.

      Ignition timing:
      5 to 15° BTDC @ idle
      HINT:
      Please refer to the intelligent tester operator's manual for further detail.


  1. When not using the intelligent tester:

    1. Remove the V-bank cover.



      2. Lexus Gs430, Gs300. Uzs190 Grs190

    2. Connect the tester probe of a timing light to the wire of the ignition connector for the No. 1 cylinder.

      HINT:
      Use a timing light that detects the first signal.


      3. Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Mechanical.Engine.Engine On-Vehicle Inspection

    3. Using SST, connect the terminals TC and CG of the DLC3.

      SST
      09843-18040
      NOTICE:
      1. Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.
      2. When checking the ignition timing, the transmission should be in the neutral.


      4. Lexus Gs430, Gs300. Uzs190 Grs190

    4. Using a timing light, check the ignition timing.

      Ignition timing:
      8 to 12° BTDC @ idle

    5. Remove the SST from the DLC3.

    6. Check the ignition timing.

      Ignition timing:
      5 to 15° BTDC @ 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.



3. INSPECT ENGINE IDLE SPEED

  1. Warm up and stop the engine.

    NOTICE:
    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 rpm should be stabilized.


    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Mechanical.Engine.Engine On-Vehicle Inspection

  1. When using the intelligent tester:

    1. Connect the intelligent tester to the DLC3.

      NOTICE:
      Switch off all accessories and A/C before connecting the intelligent tester.

    2. Race the engine speed at 2,500 rpm for approximately 90 seconds.

    3. Push the intelligent tester main switch ON.

    4. Enter the following items: Powertrain / Engine and ECT / Data list / Engine SPD.

      Idle speed:
      600 to 700 rpm
      NOTICE:
      When checking the idle speed, the transmission should be in the neutral.
      HINT:
      Please refer to the intelligent tester operator's manual for further details.
      If the idle speed is not as specified, check the air intake system.

    5. Disconnect the intelligent tester from the DLC3.



    Lexus Gs430, Gs300. Uzs190 Grs190.3Gr-Fse Engine Mechanical.Engine.Engine On-Vehicle Inspection

  1. When not using the intelligent tester:

    1. Using SST, connect the tachometer probe to terminal TAC of the DLC3.

      SST
      09843-18040
      NOTICE:
      Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.

    2. Race the engine speed at 2,500 rpm for approximately 90 seconds.

    3. Check the idle speed.

      Idle speed:
      600 to 700 rpm (Transmission neutral position)
      If the speed is not as specified, check the air intake system.

    4. Disconnect the tachometer from the DLC3.



4. INSPECT COMPRESSION

  1. Warm up and stop the engine.

    NOTICE:
    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 rpm should be stabilized.

  1. Remove the cool air intake duct seal.

  1. Remove the No. 1 air cleaner inlet.

  1. Remove the V-bank cover.

  1. Remove the No. 1 air cleaner hose.

  1. Remove the intake air surge tank.

  1. Disconnect the 6 injector connectors.

  1. Remove the 6 ignition coils.

  1. Remove the 6 spark plugs.



    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Inspect the cylinder compression pressure.

    1. Insert a compression gauge into the spark plug hole.

    2. While cranking the engine, measure the compression pressure.

      HINT:
      Always use a fully charged battery to obtain engine speed of 250 rpm or more.
      NOTICE:
      The measurement must be done as quickly as possible.
      Compression pressure:
      1,400 kPa (14 kgf*cm2, 199 psi) or more
      Minimum pressure:
      980 kPa (10.0 kgf*cm2, 142 psi)
      Difference between each cylinder:
      100 kPa (1.0 kgf*cm2, 15 psi) or less

    3. Perform the inspection above for each cylinder.

    4. If the cylinder compression in one or more cylinders is low, pour a small amount of engine oil into the cylinder through the spark plug hole. Then perform the first 3 steps under "inspect the cylinder compression pressure" for the cylinders with low compression.

      HINT:
      1. If adding oil helps the compression, it is likely that the piston rings and / or cylinder bore are worn or damaged.
      2. If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.

  1. Install the 6 spark plugs.

  1. Install the 6 ignition coils.

  1. Connect the 6 injector connectors.

  1. Install the intake air surge tank.

  1. Install the No. 1 air cleaner hose.

  1. Install the V-bank cover.

  1. Install the No. 1 air cleaner inlet.

  1. Install the cool air intake duct seal.



5. INSPECT CO/HC
HINT:
This check for determining whether or not the idle CO / HC complies with regulations.

  1. Start the engine.

  1. Keep the engine speed at 2,500 rpm for approximately 180 seconds.



    Lexus Gs430, Gs300. Uzs190 Grs190

  1. Insert CO / HC meter testing probe at least 40 cm (1.3 ft.) into tailpipe during idling.

  1. Immediately check CO / HC concentration at idle and / or 2,500 rpm.

    HINT:
    1. When performing the 2 mode (2,500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.
    2. If the CO / HC concentration does not comply with regulations, troubleshoot in the order given below.

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

    2. See the table below for possible cause, then inspect and correct the applicable causes if necessary.

      CO
      		HC
      		Symptom
      		Causes
      Normal
      		High
      		Rough idle
      1. 1. Faulty ignitions
      1. Incorrect timing
      1. Fouled, shorted or improperly gapped plugs
      1. 2. Leaky intake and exhaust valves
      1. 3. Leaky cylinder
      Low
      		High
      		Rough idle
      (Fluctuating HC reading)
      1. 1. Vacuum leaks
      1. PCV hose
      1. Intake manifold
      1. Throttle body
      1. 2. Lean mixture causing misfire
      High
      		High
      		Rough idle
      (Black smoke from exhaust)
      1. 1. Restricted air filter
      1. 2. Faulty fuel SFI system
      1. Faulty pressure
      1. Defective ECT sensor
      1. Faulty ECM
      1. Faulty injector
      1. Faulty throttle position sensor
      1. Faulty MAF sensor