ENGINE ON-VEHICLE INSPECTION

PROCEDURE


  1. INSPECT ENGINE COOLANT

    Click here

  2. INSPECT ENGINE OIL

    Click here

  3. INSPECT BATTERY

    Click here

  4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


    1. Remove the air cleaner and hose Click here.

    2. Remove the air cleaner filter element sub-assembly.

    3. Visually check that the air cleaner filter is not excessively damaged or oily. If necessary, replace the air cleaner filter.

      Tech Tips


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

      • If any dirt or a blockage remains 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 and hose Click here.

  5. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY


    1. Remove the V-ribbed belt Click here.

    2. Check that nothing is caught in the tensioner by turning it clockwise and counterclockwise. If a malfunction exists, replace the tensioner.

    3. Install the V-ribbed belt Click here.

  6. INSPECT SPARK PLUG

    Click here

  7. 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 preceding inspection.

      Tech Tips

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

  8. INSPECT IGNITION TIMING

    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 transaxle should be in neutral or park.


    1. Warm up and stop the engine.

    2. When using the intelligent tester: Check the ignition timing.


      1. Connect the intelligent tester to the DLC3.

      2. Start the engine and run it at idle.

      3. Turn the tester on.

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

        Standard ignition timing
        Transaxle Ignition Timing
        Manual Transaxle -5 to 5 degrees BTDC
        CVT

        Tech Tips

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

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

      6. Enter the following menus: Powertrain / Engine and ECT / Active Test / Connect the TC and TE1 / ON.

      7. Monitor IGN Advance of the Data List.

        Standard ignition timing
        Transaxle Ignition Timing
        Manual Transaxle 8 to 12 degrees BTDC
        CVT

        Note

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

        Tech Tips


        • The idling speed may fluctuate while connecting TC and TEI terminals, because the fixed ignition timing is not for idle control but for inspection.

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

      8. Enter the following menus: Connect the TC and TE1 / OFF.

      9. Turn the ignition switch off.

      10. Disconnect the intelligent tester from the DLC3.

    3. When not using the intelligent tester:


      1. A005H72E14
        Text in Illustration
        *a Front view of DLC3

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

        SST
        09843-18040

        Note


        • Be sure to connect the terminals correctly. Failure to do this can damage the engine.

      2. A005GK9

        Connect the clip of the timing light to the wire harness.

        Note

        Use a timing light that detects the primary signal.

      3. A005GGLE02
        Text in Illustration
        *a TDC
        *b 8 to 12 degrees BTDC

        Inspect the ignition timing at idle.

        Standard ignition timing
        Transaxle Ignition Timing
        Manual Transaxle 8 to 12 degrees BTDC
        CVT

        Note

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

        Tech Tips


        • If the cutout of the crankshaft pulley is positioned within the range*b of the timing chain cover sub-assembly, the ignition timing is within the specified range.

        • The idling speed may fluctuate while connecting TC and TEI terminals, because the fixed ignition timing is not for idle control but for inspection.

        • After running the engine at 1000 to 1300 rpm for 5 seconds, check that it returns to idle speed.

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

      5. Inspect the ignition timing at idle.

        Standard ignition timing
        Transaxle Ignition Timing
        Manual Transaxle -5 to 5 degrees BTDC
        CVT

      6. Confirm that the ignition timing advances when the engine rpm is increased.

      7. Remove the timing light.

  9. INSPECT ENGINE IDLE SPEED

    Note


    • Turn all electrical systems and the A/C off.

    • Inspect the idle speed with the cooling fans off.

    • When checking the idle speed, the transaxle should be in neutral or park.


    1. Warm up and stop the engine.

    2. Connect the intelligent tester to the DLC3.

    3. Start the engine and run it at idle.

    4. Turn the tester on.

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

      Tech Tips

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

    6. Inspect the engine idle speed.

      Standard Idle Speed
      Transaxle Idling Speed
      Manual Transaxle 550 to 650 rpm
      CVT 600 to 700 rpm

    7. Turn the ignition switch off.

    8. Disconnect the intelligent tester from the DLC3.

  10. INSPECT COMPRESSION


    1. Check for DTCs Click here.

      Tech Tips

      If any DTC is present, perform troubleshooting in accordance with the procedure for that DTC.

    2. Warm up and stop the engine.

    3. Remove the 4 spark plugs Click here.

      Note

      Take care to ensure that foreign objects do not enter the intake manifold.

    4. Disconnect the 4 fuel injector connectors.

    5. A005GIF

      Inspect the cylinder compression pressure.


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

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

        Standard compression pressure
        1200 kPa (12.2 kgf/cm2, 174 psi)
        Minimum pressure
        900 kPa (9.1 kgf/cm2, 131 psi)
        Difference between each cylinder
        98 kPa (1.0 kgf/cm2, 14.2 psi) or less

        Note


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

        • Inspect the other cylinders in the same way.

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

      3. If the cylinder compression is low, pour a small amount of engine oil into the cylinder through the spark plug hole, and then inspect it again.

        Tech Tips


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

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

    6. Connect the 4 fuel injector connectors.

    7. Install the 4 spark plugs Click here.

    8. Clear the DTC Click here.

    9. Check for DTCs Click here.

      Tech Tips

      Reinstall the sensors, connectors, etc. and restore the previous vehicle conditions before rechecking for DTCs.

  11. INSPECT CO/HC

    Tech Tips

    This check determines whether or not the idle CO/HC complies with local regulations.


    1. Start 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 (1.3 ft.) into the tailpipe while idling.

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

      Tech Tips

      When doing 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 local 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 causes, and then inspect the applicable parts and repair them if necessary.

        CO HC Problem Possible Cause
        Normal High Rough idle

        1. Faulty ignition:


          • Incorrect timing

          • Fouled, shorted or improperly gapped plugs

        2. Incorrect valve clearance

        3. Leakage from intake and exhaust valves

        4. Leakage from 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 cleaner filter element

        2. Plugged PCV valve

        3. Faulty EFI system:


          • Faulty pressure regulator

          • Faulty engine coolant temperature sensor

          • Faulty mass air flow meter

          • Faulty ECM

          • Faulty injectors

          • Throttle body