ENGINE ON-VEHICLE INSPECTION

PROCEDURE


  1. INSPECT ENGINE COOLANT

    Click here

  2. INSPECT ENGINE OIL

    Click here

  3. INSPECT BATTERY


  4. 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 damaged or excessively oily. If necessary, replace the air cleaner filter element sub-assembly.

      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.

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

  5. INSPECT SPARK PLUG

    Click here

  6. INSPECT FAN AND GENERATOR V BELT

    Click here

  7. INSPECT VALVE LASH ADJUSTER 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 preceding 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. Turn the ignition switch to ON.

      3. Turn the GTS on.

      4. Start the engine.

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

      6. Monitor IGN Advance of the Data List.

        Standard Ignition Timing
        -5 to 5° BTDC at idle

        Note


        • Turn off all electrical systems and the A/C (w/ Air conditioning system).

        • Check the ignition timing with the cooling fans off.

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

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

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

      9. Monitor IGN Advance of the Data List.

        Standard Ignition Timing
        8 to 12° BTDC at idle

        Tech Tips

        The idling speed may fluctuate while connecting TC and TE1 terminals, because the fixed ignition timing is not for idle control but for inspection.

    3. When not using the GTS:


      1. Remove the No. 1 engine cover.

        Click here

      2. Start the engine.

      3. A00479AC95
        *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.

        • Turn off all electrical systems and the A/C (w/ Air conditioning system).

        • Check the ignition timing with the cooling fans off.

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

        Tech Tips

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

      4. A004AUI

        Connect the clip of a timing light to the ignition coil wire shown in the illustration.

        Note

        Use a timing light that detects primary signals.

      5. A0049GOC06
        *a TDC
        *b 8 to 12° BTDC at idle

        Check the ignition timing at idle.

        Standard Ignition Timing
        8 to 12° BTDC at idle

        Tech Tips


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

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

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

      7. Check the ignition timing at idle.

        Standard Ignition Timing
        -5 to 5° BTDC at idle

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

      9. Stop the engine.

      10. Disconnect the clip of the timing light from the ignition coil wire.

      11. Install the No. 1 engine cover.

        Click here

  9. INSPECT ENGINE IDLE SPEED


    1. Warm up and stop the engine.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

    5. Start the engine.

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

    7. Read the value displayed on the tester.

      Standard Idle Speed
      for Manual Transaxle
      550 to 650 rpm
      for CVT
      680 to 780 rpm

      Note


      • Turn off all electrical systems and the A/C (w/ Air conditioning system).

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

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

  10. INSPECT COMPRESSION

    Note

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


    1. Check for DTCs.

      Click here

    2. Warm up and stop the engine.

    3. Remove the 4 spark plugs.

      Click here

    4. A004BJT

      Disconnect the fuel injector connector shown in the illustration.

      Note

      Disable fuel injection in order to prevent catalyst damage due to unburned gasoline.

    5. A0047GJ

      Inspect 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
        1350 kPa (13.8 kgf/cm2, 196 psi)
        Minimum Compression Pressure
        900 kPa (9.2 kgf/cm2, 131 psi)
        Pressure Difference between each Cylinder
        98 kPa (1.0 kgf/cm2, 14.2 psi) or less

        Note


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

        • Measure the compression pressure in as short a time 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 and inspect it again.

        Tech Tips


        • If adding engine 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.

    6. Connect the fuel injector connector.

    7. Install the 4 spark plugs.

      Click here

    8. Clear the DTCs.

      Click here

      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 or not the idle CO/HC complies with regulations.


    1. Start the engine.

    2. Run the engine at 2500 rpm for approximately 180 seconds.

    3. Insert a CO/HC meter testing probe at least 40 cm (1.31 ft.) into the exhaust tail pipe assembly during idling.

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

      Tech Tips

      When performing a 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 the regulations, perform troubleshooting in the order given below.


      1. Check for DTCs.

        Click here

      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 plugs

        2. Incorrect valve clearance (valve lash adjuster assembly)

        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 body with motor 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 system:


          • Fuel pressure regulator assembly

          • Engine coolant temperature sensor

          • Mass air flow meter

          • ECM

          • Fuel injector assemblies

          • Throttle body with motor assembly