ENGINE ON-VEHICLE INSPECTION

PROCEDURE


  1. INSPECT ENGINE COOLANT

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  2. INSPECT ENGINE OIL

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  3. CHECK BATTERY CONDITION

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  4. CHECK SPARK PLUG

    Click here

  5. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY


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

    2. Visually check that the air cleaner filter element sub-assembly is not excessively damaged or oily.

      Tech Tips


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

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

      • If necessary, replace the air cleaner filter element sub-assembly.

    3. Install the air cleaner filter element sub-assembly.

  6. INSPECT V-RIBBED BELT TENSIONER ASSEMBLY


    1. Remove the V-ribbed belt.

      Click here

    2. Check that the V-ribbed belt tensioner assembly turns smoothly by turning it clockwise and counterclockwise.

      Tech Tips

      If the V-ribbed belt tensioner assembly does not turn smoothly, replace the V-ribbed belt tensioner assembly.

    3. Install the V-ribbed belt.

      Click here

  7. INSPECT VALVE LASH ADJUSTER ASSEMBLY NOISE


    1. Rev up the engine several times. Check that the engine does not emit unusual noises.

    2. If unusual noises occur, warm up the engine and idle it for 30 minutes or more, then perform the inspection.

      Tech Tips

      If any defects or problems are found during the inspection, perform valve lash adjuster assembly inspection.

      Click here

  8. INSPECT IGNITION TIMING


    1. Warm up and stop the engine.

    2. When using the GTS:


      1. Connect the GTS to the DLC3.

      2. Start the engine and run it at idle.

      3. Turn the GTS on.

      4. Enter the following menus: Powertrain / Engine and ECT / Data List / Ignition Timing Cylinder #1.


        Powertrain > Engine > Data List
        Tester Display
        Ignition Timing Cylinder #1
        Standard Ignition Timing
        5 to 20° BTDC at idle

        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.

      5. Enter the following menus: Powertrain / Engine and ECT / Active Test /Active the TC Terminal.


        Powertrain > Engine > Active Test
        Tester Display
        Activate the TC Terminal
      6. Monitor IGN Advance of the Data List.

        Standard Ignition Timing
        8 to 12° BTDC at idle
      7. Enter the following menus: Connect the TC and TE1 / OFF.

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

    3. When not using the GTS:


      1. A01R36NC51
        *a 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 may damage electrical components.

        • 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.

      2. Remove the No. 1 engine cover sub-assembly.

        Click here

      3. A01R7FZ

        Connect the clip of the timing light to the wire harness as shown in the illustration.

        Note

        Use a timing light that detects primary signals.

      4. Inspect the ignition timing at idle.

        Standard Ignition Timing
        8 to 12° BTDC at idle

        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.

        If the ignition timing is not as specified, check the valve timing.

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

      6. Inspect the ignition timing at idle.

        Standard Ignition Timing
        5 to 20° BTDC at idle

        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.

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

      8. Disconnect the clip of the timing light.

      9. Install the No. 1 engine cover sub-assembly.

        Click here

  9. INSPECT ENGINE IDLE SPEED


    1. Warm up and stop the engine.

    2. When using the GTS:


      1. Connect the GTS to the DLC3.

      2. Start the engine and run it at idle.

      3. Turn the GTS on.

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


        Powertrain > Engine > Data List
        Tester Display
        Engine Speed
      5. Inspect the engine idle speed.

        Standard Idle Speed
        750 to 850 rpm

        Note


        • Check the engine idle speed with the cooling fans off.

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

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

    3. When not using the GTS:


      1. B0074VQC12
        *a DLC3

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

        SST
        09843-18030

        Note

        Be sure to connect the tachometer probe to the correct terminal. Connecting to the wrong terminal may damage electrical components.

      2. Start the engine and run it at idle.

      3. Inspect the engine idle speed.

        Standard Idle Speed
        750 to 850 rpm

        Note


        • Check the engine idle speed with the cooling fans off.

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

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

      4. Disconnect the tachometer probe from terminal 9 (TAC) of the DLC3.

  10. INSPECT COMPRESSION

    Note

    Keep the spark plug holes free of foreign matter when measuring the compression pressure.


    1. Warm up and stop the engine.

    2. Check for DTCs.


    3. Remove the No. 1 engine cover sub-assembly.

      Click here

    4. Remove the No. 1 engine under cover assembly.

      Click here

    5. Remove the 4 spark plugs.

      Click here

    6. A01R5JB

      Disconnect the fuel injector connector (for Port Injection).

    7. A01R6U4

      Disconnect the fuel injector connector (for Direct Injection).

    8. 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.

        Standard Compression Pressure
        1200 kPa (12.2 kgf/cm2, 174 psi)
        Minimum Compression Pressure
        900 kPa (9.2 kgf/cm2, 131 psi)
        Pressure 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.

        • Inspect all cylinders in the same way.

        • Measure the compression pressure as quickly as possible.

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

        Tech Tips


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

        • If the compression pressure stays low, a valve may be stuck or seated improperly, or there may be leaks in the cylinder head gasket.

    9. Connect the fuel injector connector (for Direct Injection).

    10. Connect the fuel injector connector (for Port Injection).

    11. Install the 4 spark plugs.

      Click here

    12. Install the No. 1 engine under cover assembly.

      Click here

    13. Install the No. 1 engine cover sub-assembly.

      Click here

    14. Clear the DTCs.


      Note

      After the inspection, clear the DTCs, check for DTCs again and make sure the normal system code is output.

  11. INSPECT CO/HC

    Tech Tips

    This check determines whether 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 a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the tailpipe while idling.

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

      Tech Tips


      • When performing the 2 mode test (2500 rpm and idle), the measurement procedures are determined by applicable local regulations.

      • If the CO/HC concentration does not comply with the regulations, perform troubleshooting in the following order.


      1. Check for DTCs.


      2. See the following table for possible causes, 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 spark plugs

        2. Incorrect valve clearance

        3. Leaks in intake or exhaust valves

        4. Leaks in cylinders

        Low High Rough idle (Fluctuating HC reading)
        1. Vacuum leaks:


          • PCV hoses

          • Intake manifold

          • Throttle with motor body assembly

          • Brake booster line

        2. Lean mixture causing misfire

        High High Rough idle (Black smoke from exhaust)
        1. Restricted air cleaner filter element sub-assembly

        2. Plugged PCV valve

        3. Faulty SFI systems:


          • Fuel pressure regulator assembly

          • Engine coolant temperature sensor

          • ECM

          • Fuel injector assemblies

          • Throttle body assembly

          • Mass air flow meter sub-assembly