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Home >> Nissan-Datsun >> 2004 >> Sentra SE-R >> Repair and Diagnosis >> External Pages >> Different car >> Section 1911 (Engine Mechanical (2AZ-FE)) >> Engine >> On-Vehicle Inspection

On-Vehicle Inspection

WARNING: This page is about a different car, the 2006 Scion tC. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT ENGINE COOLANT 
  2. INSPECT ENGINE OIL 
  3. INSPECT BATTERY 
  4. INSPECT AIR CLEANER FILTER ELEMENT SUBASSEMBLY 
    1. Remove the air cleaner cap sub-assembly.
    2. Remove the air filter element.
    3. Visually check that the air filter is not excessively damaged or oily.

      If necessary, replace the air filter.

  5. INSPECT SPARK PLUG 
  6. INSPECT FAN AND GENERATOR V BELT 

    HINT:

    You do not need to check the belt deflection because the auto tensioner has been adopted.

  7. INSPECT IGNITION TIMING 
    NOTE:
    • Turn all the electrical systems and the A/C OFF.
    • Inspect the ignition timing with the cooling fan OFF.
    • When checking the ignition timing, shift the transmission to the neutral position.
    1. Warm up and stop the engine.
    2. When using the intelligent tester:
      1. Connect the intelligent tester to the DLC3.
      2. Allow the engine to idle.
      3. Select the following menu items:

        DIAGNOSIS / ENHANCED OBD II / DATA LIST.

      4. Read IGN ADVANCE to check the ignition timing.

        Standard ignition timing: 

        5 to 15° BTDC @ idle 

      5. Check that the ignition timing advances immediately when the engine speed is increased.
      6. Turn the ignition switch OFF.
      7. Disconnect the intelligent tester from the DLC3.
      Fig 1: Connecting Hand-Held Tester To DLC3
      G04221425Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. When not using the intelligent tester:
      1. Remove the No. 1 engine cover (see REMOVAL ).
      2. Open the IG cover located in the right of the No. 4 ignition coil.
      3. Pull out the wire harness as shown in the illustration.
      4. Connect the timing light to the wire harness.
        NOTE: Use a timing light that detects the first signal.
        Fig 2: Pulling Out Wire Harness
        G04221426Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

        SST 09843-18040 

      6. Allow the engine to idle and check the ignition timing.

        Standard ignition timing: 

        8 to 12° BTDC @ idle 

        HINT:

        Run the engine speed at 1,000 to 1,300 RPM for 5 seconds, then check that the engine speed returns to the idling speed.

      7. Remove the SST from the DLC3.
      8. Allow the engine to idle and check the ignition timing.

        Standard ignition timing: 

        5 to 15° BTBC 

      9. Check that the ignition timing advances immediately when the engine speed is increased.
      10. Turn the ignition switch OFF.
      11. Remove the timing light.
      12. Close the IG cover.
      13. Install the No. 1 engine cover (see INSTALLATION  ).
      Fig 3: Identifying Terminals 13 (TC) And 4 (CG) Of DLC3
      G04221427Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT ENGINE IDLE SPEED 
    1. With intelligent tester:
      1. Turn OFF all the accessories and air conditioning.
      2. Move the shift lever to P or neutral.
      3. Connect the intelligent tester to the DLC3.
      4. Warm up the engine.
      5. Select the tester menus: DIAGNOSIS, ENHANCED OBD II and DATA LIST.
      6. Read ENGINE SPEED to check the idle speed while the radiator-cooling fan is not rotating.

        Standard idle speed 

        Item Specified Condition
        A/T vehicle 610 to 710 RPM
        M/T vehicle 650 to 750 RPM
      7. 7) Turn the ignition switch OFF.
      8. Disconnect the tester from the DLC3.
      Fig 4: Connecting Hand-Held Tester To DLC3
      G04221428Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Without intelligent tester:
      1. Turn OFF all the accessories and air conditioning.
      2. Move the shift lever to P or neutral.
      3. Connect the SST to 9 (TAC) of the DLC3 terminal, and then connect a tachometer to the SST.

        SST 09843-18030 

      4. Warm up the engine.
      5. Check the idle speed while the radiator-cooling fan is not rotating.
        Fig 5: Identifying Terminal 9 (TAC) Of DLC3
        G04221429Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Standard idle speed 

        Item Specified Condition
        A/T vehicle 610 to 710 RPM
        M/T vehicle 650 to 750 RPM
      6. Turn the ignition switch OFF.
      7. Remove the tachometer and disconnect the SST from the DLC3.
  9. INSPECT COMPRESSION 
    1. Warm up and stop the engine.
    2. Remove the No. 1 engine cover (see REMOVAL ).
    3. Remove the 4 ignition coils (see REMOVAL ).
    4. Remove the 4 spark plugs.
    5. Disconnect the 4 fuel injector connectors.
    6. Set SST and a compression gauge.

      SST 09992-00500 

    7. Insert the compression gauge into the spark plug hole.
    8. While cranking the engine, measure the compression pressure.

      Standard compression pressure: 

      1,300 kPa (13.3 kgf/cm 2  , 189 psi) 

      Minimum pressure: 

      1,000 kPa (10.2 kgf/cm 2  , 145 psi) 

      Standard difference between each cylinder: 

      100 kPa (1.0 kgf/cm 2  , 14 psi) 

      NOTE:
      • Always use a fully charged battery to obtain an engine speed of 250 RPM or more.
      • Check the other cylinders' compression pressures in the same way.
      • This measurement must be done as quickly as possible.
      Fig 6: Inserting Compression Gauge Into Spark Plug Hole
      G04221430Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

      HINT:

      • 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.
  10. INSPECT CO/HC 

    HINT:

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

    1. Start and warm up the engine.
    2. Run the engine at 2,500 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. Inspect the CO/HC concentration while idling and/or at 2,500 RPM.

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

      1. See the table below for possible causes, and then inspect and repair the applicable causes if necessary.
      PROBLEM AND CAUSES CHART

      CO HC Problems Causes
      Normal High Rough idle
      1. Faulty ignition:
        • 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 leakage:
        • Ventilation 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

        Faulty SFI system:

        • Faulty pressure regulator
        • Faulty engine coolant temperature sensor
        • Faulty mass air flow meter
        • Faulty ECM
        • Faulty injectors
        • Faulty throttle body
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