ENGINE ON-VEHICLE INSPECTION


  1. INSPECT ENGINE COOLANT

    Click here

  2. INSPECT ENGINE OIL

    Click here

  3. INSPECT BATTERY

    Click here

  4. INSPECT SPARK PLUG

    Click here

  5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Remove the air cleaner filter element sub-assembly from the air cleaner case.

    2. Visually check that there is no dirt, clog, and damage to the air cleaner filter element sub-assembly.

      Tech Tips


      • If there is any dirt or clog on the air cleaner filter element sub-assembly, clean it with compressed air.

      • If any dirt or clog remains even after cleaning the air cleaner filter element sub-assembly with compressed air, replace it.

  6. INSPECT VALVE LASH ADJUSTER NOISE


    1. Rev 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 more than 30 minutes. Then perform the inspection above again.

      Tech Tips

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

  7. INSPECT IGNITION TIMING


    1. Warm up 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 speed should be stabilized.

    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 main switch on.

      4. Enter the following menus:

        Powertrain / Engine and ECT / Data List / IGN Advance

        Standard ignition timing
        5 to 15° BTDC at idle

        Note

        When checking the ignition timing, the transmission should be in neutral or park.

        Tech Tips

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

    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.4 cylinder.

        Note


        • Use a timing light that detects primary signals.

        • After checking, be sure to wrap the wire harness with tape.

      2. Start the engine and idle it.

      3. A01BHJ6E05

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

        SST
        09843-18040
        Text in Illustration
        *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 or park.

        Tech Tips


        • A01BCEYE09

        • After connecting terminals (TC and CG), engine speed changes to approximately 1000 to 1500 rpm for 5 seconds, and then returns to idle speed. This is because the ECM checks that the ISC (idle speed control system) operates properly.

        • Perform the inspection of the ignition timing after engine speed is returned to idle speed.

        Text in Illustration
        *a Engine Speed
        *b Approx. 1000 to 1500 rpm
        *c 5 sec.
        *d Idle Speed
        *e Connect Terminals TC and CG

      4. Inspect the ignition timing

        Standard ignition timing
        3 to 7° BTDC at idle

      5. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.

      6. Inspect the ignition timing

        Standard ignition timing
        5 to 15° BTDC at idle

      7. Check that the ignition timing advances immediately when the engine speed is increased.

      8. Turn the ignition switch off.

      9. Remove the timing light.

  8. INSPECT ENGINE IDLE SPEED


    1. Warm up and stop the engine.

    2. When using the intelligent tester:


      1. Connect the intelligent tester to the DLC3.

        Tech Tips

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

      2. Start the engine and idle it.

      3. Turn the intelligent tester main switch on.

      4. Enter the following menus:

        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 position.

        • Switch off all accessories and air conditioning before connecting the intelligent tester.

      5. Turn the ignition switch off.

      6. Disconnect the intelligent tester from the DLC3.

    3. A01BHJ6E06
      Text in Illustration
      *a Front view of DLC3

      When not using the intelligent tester:


      1. Install SST to terminal 9 (TAC) of DLC3, and then connect a tachometer.

        SST
        09843-18030

        Note

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

      2. Start the engine and idle it.

      3. Inspect the engine idling speed.

        Idle speed
        650 to 750 rpm

      4. Turn the ignition switch off.

      5. Disconnect the tachometer.

      6. Remove SST from terminal 9 (TAC).

  9. INSPECT ENGINE IDLE SPEED CONTROL SYSTEM


    1. Warm up and stop the engine.

    2. A01BHJ6E05
      Text in Illustration
      *a Front view of DLC3

      Check the idle speed control system.


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

        SST
        09843-18040

      2. Start the engine and idle it.

        Note


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

        • Turn off all electrical systems before connecting the terminals.

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

      3. A01BCEYE09
        Text in Illustration
        *a Engine Speed
        *b Approx. 1000 to 1500 rpm
        *c 5 sec.
        *d Idle Speed
        *e Connect Terminals TC and CG

        After connecting terminals 13 (TC) and 4 (CG), check that the engine speed changes to approximately 1000 to 1500 rpm for 5 seconds, and then returns to idle speed.

        Tech Tips

        If the result is not as specified, check the throttle body assembly, DTC and wire harness.

  10. INSPECT COMPRESSION


    1. Warm up and stop the engine.

    2. Check for DTCs Click here.

    3. Remove the intake air connector.

    4. Disconnect the 4 fuel injector connectors.

    5. Remove the 4 bolts and 4 ignition coils.

    6. Remove the 4 spark plugs.

    7. Check the cylinder compression pressure.


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

      2. Fully open the throttle.

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

        Compression pressure
        1230 kPa (12.5 kgf/cm2, 178 psi) or higher
        Minimum pressure
        883 kPa (9.0 kgf/cm2, 128 psi)
        Difference between each cylinder
        98 kPa (1.0 kgf/cm2, 14 psi) or less

        If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole and perform inspection again.

        Note


        • Use a fully-charged battery so the engine speed can be increased to 250 rpm or more.

        • Inspect the other cylinders in the same way.

        • Measure the compression in as short a time as possible.

        Tech Tips


        • If adding oil increases the compression, the piston rings and/or cylinder bore may be worn or damaged.

        • If pressure stays low, a valve may be stuck or seated improperly, or there may be leakage in the gasket.

    8. Install the 4 spark plugs.

    9. Install the 4 ignition coils with the 4 bolts.

      Torque:
      9.0 N*m  { 92 kgf*cm, 80 in.*lbf }

    10. Connect the 4 fuel injector connectors.

    11. Install the intake air connector.

    12. Check the DTCs Click here.

  11. INSPECT CO/HC


    1. Start and warm up the engine.

    2. Run the engine 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 while idling.

    4. Immediately check the CO/HC concentration at idle and at 2500 rpm.

      Tech Tips


      • 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.

    5. If the CO/HC concentration is not as specified, perform troubleshooting in the order given below.


      1. Check the air fuel ratio sensor Click here and heated oxygen sensor Click here operation.

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

        CO HC Problems Causes
        Normal High Rough idle

        1. Faulty ignitions:


          • Incorrect timing

          • Fouled, shorted or improperly gapped plugs

        2. Incorrect valve clearance

        3. Leaks in intake and exhaust valves

        4. Leaks in cylinders
        Low High

        Rough idle

        (Fluctuating HC reading)

        1. Vacuum leaks:


          • PCV hoses

          • Intake manifold

          • Throttle body

          • Brake booster line

        2. Lean mixture causing misfire
        High High

        Rough idle

        (Black smoke from exhaust)

        1. Restricted air filter

        2. Plugged PCV valve

        3. Faulty SFI systems:


          • Faulty pressure regulator

          • Defective engine coolant temperature sensor

          • Defective mass air flow meter

          • Faulty ECM

          • Faulty injectors

          • Faulty throttle body