ENGINE ON-VEHICLE INSPECTION


  1. INSPECT IGNITION TIMING


    1. Warm up and stop the engine.


      1. Allow the engine to warm up to a normal operating temperature.

    2. When using the intelligent tester:


      1. Connect the intelligent tester to the DLC3.

      2. Start the engine and idle it.

      3. Turn the intelligent tester on.

      4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / IGN Advance.

        Tech Tips

        Refer to the intelligent tester operator's manual for further details.

        Standard ignition timing
        8 to 12° BTDC @ idling (transmission in neutral and A/C switch off)

      5. Disconnect the intelligent tester from the DLC3.

    3. When not using the intelligent tester:


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

        Note

        Use a timing light that detects primary signals.

      2. A0159JBE05
        Text in Illustration
        *a Front view of DLC3

        Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

        SST
        09843-18040

        Note


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

        • Switch off all accessories and the A/C before connecting the terminals.

      3. A015B3B

        Using the timing light, check the ignition timing.

        Standard ignition timing
        8 to 12° BTDC @ idling (transmission in neutral and A/C switch off)

      4. Remove SST from the DLC3.

      5. Check the ignition timing.

        Standard ignition timing
        7 to 24° BTDC @ idling (transmission in neutral and A/C switch off)

      6. Disconnect the timing light from the engine.

  2. INSPECT ENGINE IDLE SPEED


    1. Warm up and stop the engine.


      1. Allow the engine to warm up to a normal operating temperature.

    2. When using the intelligent tester:


      1. Connect the intelligent tester to the DLC3.

        Note

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

      2. Race the engine at 2500 rpm for approximately 90 seconds.

      3. Turn the intelligent tester on.

      4. Enter the following menus: Powertrain / Engine and ECT / Data List / Primary / Engine Speed.

        Standard idle speed
        650 to 750 rpm (transmission in neutral and A/C switch off)

        Tech Tips

        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.

    3. A0159JBE06
      Text in Illustration
      *a Front view of DLC3

      When not using the intelligent tester:


      1. Using SST, connect the tachometer probe to terminal 9 (TAC) of the DLC3.

        SST
        09843-18030

        Note


        • Confirm the terminal number before connecting the probe. Connecting the probe to the wrong terminal can damage the engine.

        • Switch off all accessories and the A/C before connecting the probe.

      2. Race the engine at 2500 rpm for approximately 90 seconds.

      3. Check the idle speed.

        Standard idle speed
        650 to 750 rpm (transmission in neutral and A/C switch off)

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

      4. Disconnect the tachometer probe from the DLC3.

  3. INSPECT COMPRESSION


    1. Warm up and stop the engine.


      1. Allow the engine to warm up to a normal operating temperature.

    2. Remove the V-bank cover.

    3. Remove the air cleaner hose assembly Click here.

    4. Remove the air cleaner assembly Click here.

    5. Disconnect the water by-pass pipe assembly Click here.

    6. A0155GCE01
      Text in Illustration
      *A for Bank 1
      *B for Bank 2

      Disconnect the 2 injector connectors and 8 ignition coil connectors.

    7. Remove the 8 bolts and 8 ignition coils Click here.

    8. Remove the 8 spark plugs Click here.

    9. Check the cylinder compression pressure.

      Note

      Check the compression pressure of each cylinder in the same way.


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

      2. Fully open the throttle.

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

        Standard compression pressure
        1300 kPa (13.3 kgf/cm2, 189 psi) or higher
        Minimum pressure
        1000 kPa (10.2 kgf/cm2, 145 psi)
        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.

        • This measurement must be done as quickly as possible.

      4. If the cylinder compression is low in one or more cylinders, pour a small amount of engine oil into the cylinder with low compression through its spark plug hole. Then inspect the cylinder compression pressure again.

        Tech Tips


        • 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.

    10. Install the 8 spark plugs Click here.

    11. Install the 8 ignition coils with the 8 bolts Click here.

    12. Connect the 2 injector connectors and 8 ignition coil connectors.

    13. Connect the water by-pass pipe assembly Click here.

    14. Install the air cleaner assembly Click here.

    15. Install the air cleaner hose assembly Click here.

    16. Install the V-bank cover.

  4. INSPECT CO/HC

    Tech Tips

    This check is used only to determine whether or not 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 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.

      Tech Tips

      When performing the 2 mode (2500 rpm and idle) test, follow the measurement order prescribed by the applicable local regulations.

    5. If the CO/HC concentration does not comply with the regulations, troubleshoot in the order given below.


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

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

        CO HC Symptom Cause
        Normal High Rough idle

        1. Faulty ignitions:


          • Incorrect timing

          • Plugs (contaminated, shorted or gaps are defective)

        2. Incorrect valve clearance

        3. Leaky intake and exhaust valves

        4. 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 SFI system:


          • Faulty pressure regulator

          • Defective engine coolant temperature sensor

          • Faulty ECM

          • Faulty injectors

          • Faulty throttle position sensor

          • Faulty mass air flow meter