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 cap sub-assembly Click here.

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

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

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

      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 cap sub-assembly Click here.

  5. INSPECT SPARK PLUG

    Click here

  6. INSPECT FAN AND GENERATOR V BELT

    Click here

  7. INSPECT IGNITION TIMING


    1. Warm up and stop the engine.

    2. When using the intelligent tester:


      1. Connect the intelligent tester to the DLC3.

      2. Turn the ignition switch to ON.

      3. Turn the tester on.

      4. Start the engine and run it at idle.

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

      6. Inspect the ignition timing at idle.

        Standard ignition timing
        -5 to 15° BTDC

        Note


        • Check the ignition timing with the cooling fan off.

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

        • When checking the ignition timing, the shift lever should be in N.

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

      8. Monitor IGN Advance of the Data List.

        Standard ignition timing
        8 to 12° BTDC

        Note


        • Check the ignition timing with the cooling fan off.

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

        • When checking the ignition timing, the shift lever should be in N.

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

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

      11. Turn the ignition switch off.

      12. Disconnect the intelligent tester from the DLC3.

    3. When not using the intelligent tester:


      1. Remove the air cleaner cap sub-assembly Click here.

      2. Start the engine and run it at idle.

      3. A01VGIYE14
        Text in Illustration
        *1 DLC3

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

        SST
        09843-18040

        Note


        • Confirm the terminals before connecting them. Connecting the wrong terminals may result in damage to electrical components.

        • Check the ignition timing with the cooling fan off.

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

        • When checking the ignition timing, the shift lever should be in N.

      4. A01VFO8

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

        Note

        Use a timing light that detects the primary signal.

      5. A01VINAE02
        Text in Illustration
        *a Timing Mark
        *b TDC
        *c 8 to 12° BTDC

        Inspect the ignition timing at idle.

        Standard ignition timing
        8 to 12° BTDC

        Note


        • Check the ignition timing with the cooling fan off.

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

        • When checking the ignition timing, the shift lever should be in N.

        Tech Tips

        If the crankshaft pulley timing marks are within the range shown in the illustration relative to the timing mark on the timing chain cover sub-assembly, the ignition timing is correct.

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

      7. Inspect the ignition timing at idle.

        Standard ignition timing
        -5 to 15° BTDC

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

      9. Remove the timing light.

      10. Install the air cleaner cap sub-assembly Click here.

  8. INSPECT ENGINE IDLING SPEED


    1. Warm up and stop the engine.

    2. When using the intelligent tester:


      1. Connect the intelligent tester to the DLC3.

      2. Turn the ignition switch to ON.

      3. Turn the tester on.

      4. Start the engine and run it at idle.

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

      6. Inspect the engine idle speed.

        Standard engine idle speed
        730 to 830 rpm

        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 shift lever should be in N.

      7. Turn the ignition switch off.

      8. Disconnect the intelligent tester from the DLC3.

    3. When not using the intelligent tester:


      1. A01VGIYE18
        Text in Illustration
        *1 DLC3

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

        SST
        09843-18040

        Note

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

      2. Turn the ignition switch to ON.

      3. Start the engine and run it at idle.

      4. Inspect the engine idle speed.

        Standard engine idle speed
        730 to 830 rpm

        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 shift lever should be in N.

      5. Turn the ignition switch off.

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

  9. INSPECT COMPRESSION

    Note

    Keep the spark plug holes 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 3 spark plugs Click here.

    4. Disconnect the 3 fuel injector connectors.

    5. A01VJAO

      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 pressure
        1550 kPa (15.8 kgf/cm2, 225 psi)
        Minimum pressure
        1160 kPa (11.9 kgf/cm2, 168 psi)
        Difference between each cylinder
        147 kPa (1.5 kgf/cm2, 21 psi) or less

        Note


        • Use a fully-charged battery so the engine speed can be increased to 400 rpm or more.

        • Inspect the other cylinders in the same way.

        • Measure the compression as quickly as possible.

      4. If the cylinder compression 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, the piston rings and/or cylinder bore may be worn or damaged.

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

    6. Connect the 3 fuel injector connectors.

    7. Install the 3 spark plugs Click here.

    8. Clear the DTC Click here.

      Note

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

  10. INSPECT CO/HC

    Tech Tips

    The ECM controls the concentration of CO/HC in the emission gas.


    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 during idling.

    4. Check the CO/HC concentration during idling and when running at 2500 rpm.

      Tech Tips

      When doing 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 table below for possible causes, then inspect the applicable parts and repair them if necessary.

        CO HC Problems Causes
        Normal High Rough idling

        1. Faulty ignition:


          • Incorrect timing

          • Fouled, shorted or improperly gapped plugs

        2. Incorrect valve clearance

        3. Leakage from intake valves and exhaust valves

        4. Leakage from cylinders
        Low High

        Rough idling

        (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 idling

        (Black smoke from exhaust)

        1. Restricted air cleaner filter element sub-assembly

        2. PCV valve (ventilation valve sub-assembly)

        3. Faulty SFI systems:


          • Faulty pressure regulator

          • Faulty engine coolant temperature sensor

          • Faulty manifold absolute pressure sensor

          • Faulty ECM

          • Faulty fuel injector assembly

          • Faulty throttle body with motor assembly