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Home >> Lexus >> 2008 >> IS 250 RWD, Automatic >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical (4GR-FSE) >> Engine >> On-Vehicle Inspection

On-Vehicle Inspection

  1. INSPECT ENGINE COOLANT 
    1. Inspect the engine coolant (See ON-VEHICLE INSPECTION ).
  2. INSPECT ENGINE OIL 
    1. Inspect the engine oil (See ON-VEHICLE INSPECTION ).
  3. INSPECT BATTERY 
    1. Inspect the battery (See ON-VEHICLE INSPECTION ).
  4. INSPECT SPARK PLUG 
    1. Inspect the spark plug (See ON-VEHICLE INSPECTION ).
  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.

      HINT:

      • If there is any dirt or a blockage in the air cleaner filter element, clean it with compressed air.
      • If any dirt or a blockage remains even after cleaning the air cleaner filter element with compressed air, replace it.
  6. 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.

  7. INSPECT IGNITION TIMING 
    1. 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), have an engine oil temperature of 60°C (140°F), and the engine rpm should be stabilized.
    2. When using the Techstream:
      1. Connect the Techstream to the DLC3.
      2. Start the engine and idle it.
      3. Push the Techstream main switch ON.
      4. Enter the following items: Powertrain / Engine and ECT / Data List / IGN Advance.

        Ignition timing: 

        5 to 15 BTDC at idle 

        HINT:

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

    3. 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 current.
        Fig 1: Identifying Tester Probe Of Timing Light
        G05825748Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Using SST, connect terminals TC and CG of the DLC3.

        SST 09843-18040 

        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.
          Fig 2: Identifying DLC3 Connector Terminal
          G05825749Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Using a timing light, check the ignition timing.

        Ignition timing: 

        8 to 12 BTDC at idle 

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

        Ignition timing: 

        5 to 15° 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.
        Fig 3: Checking Ignition Timing
        G05825750Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT ENGINE IDLE SPEED 
    1. 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 rpm should be stabilized.
    2. When using the Techstream:
      1. Connect the Techstream to the DLC3.
        NOTE: Switch off all accessories and A/C before connecting the Techstream.
      2. Race the engine speed at 2,500 rpm for approx. 90 seconds.
      3. Push the Techstream main switch ON.
      4. Enter the following items: powertrain / Engine and ECT / Data list / Engine SPD.

        Idle speed: 

        650 to 750 rpm 

        NOTE: When checking the idle speed, the transmission should be in the neutral.

        HINT:

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

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

      5. Disconnect the Techstream from the DLC3.
    3. When not using the Techstream:
      1. Using SST, connect the tachometer probe to terminal TAC of the DLC3.

        SST 09843-18040 

        NOTE: Confirm the terminal numbers before connecting them. Connecting the wrong terminals can damage the engine.
        Fig 4: Identifying DLC3 Connector Terminal
        G05825751Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Race the engine speed at 2,500 rpm for approx. 90 seconds.
      3. Check the idle speed.

        Idle speed (Transmission neutral position): 

        650 to 750 rpm 

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

      4. Disconnect the tachometer from the DLC3.
  9. INSPECT COMPRESSION 
    1. 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 rpm should be stabilized.
    2. Remove the cool air intake duct seal.
    3. Remove engine room side cover LH.
    4. Remove engine room side cover RH.
    5. Remove the V-bank cover.
    6. Remove the air cleaner inlet No. 1.
    7. Remove the air cleaner cap with the air cleaner hose.
    8. Remove the intake air surge tank. (See REMOVAL )
    9. Disconnect the 6 injector connectors.
    10. Remove the 6 ignition coils.
    11. Remove the 6 spark plugs.
    12. Disconnect the 2 injector driver connectors as shown in the illustration.
      Fig 5: Locating Injector Driver Connectors
      G05825752Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    13. Insert a compression gauge into the spark plug hole.
    14. While cranking the engine, measure the compression pressure.

      HINT:

      Always use a fully charged battery to obtain engine speed of 250 rpm or more.

      NOTE: The measurement must be done as quickly as possible.
      Fig 6: Measuring Compression Pressure
      G05825753Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard compression pressure: 

      1.4 MPa (14 kgf*cm 2  , 199 psi) or more Minimum pressure: 

      0.98 MPa (10.0 kgf*cm 2  , 142 psi) 

    15. Perform the inspection above for each cylinder.

      Difference between each cylinder: 

      0.1 MPa (1.0 kgf*cm 2  , 15 psi) or less 

    16. 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:

      • If adding oil helps boost the compression, it is likely that the piston rings and/or cylinder bore are worn or damaged.
      • If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.
    17. Connect the 2 injector driver connectors as shown in the illustration.
      Fig 7: Locating Injector Driver Connectors
      G05825754Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    18. Install the 6 spark plugs.

      Torque: 25 N*m (254 kgf*cm, 18 ft.*lbf) 

    19. Install the 6 ignition coils.

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

    20. Connect the 6 injector connectors.
    21. Install the intake air surge tank. (See INSTALLATION )
    22. Install the air cleaner cap with the air cleaner hose.
    23. Install the air cleaner inlet No. 1.

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

    24. Install the V-bank cover.
    25. Remove the engine room side cover LH.
    26. Remove the engine room side cover RH.
    27. Install the cool air intake duct seal.
  10. INSPECT CO/HC 

    HINT:

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

    1. Start the engine.
    2. Keep the engine speed at 2,500 rpm for approx. 180 seconds.
    3. Insert the CO / HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
    4. Immediately check CO / HC concentration at idle and / or 2,500 rpm.

      HINT:

      • When performing the 2 mode (2,500 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.
        Fig 8: Inspecting CO/HC
        G05825755Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Check the A/F sensor and heated oxygen sensor operation.
      2. See the table below for possible causes, then inspect and correct the applicable causes if necessary.
        SYMPTOM CHART

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