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Home >> Toyota >> 2007 >> Highlander Hybrid Limited, AWD >> Repair and Diagnosis >> Engine Mechanical >> Mechanical >> Engine Mechanical (Hybrid) >> Engine >> On-Vehicle Inspection

On-Vehicle Inspection

  1. INSPECT COOLANT  (See COOLING SYSTEM )
  2. INSPECT ENGINE OIL  (See LUBRICATION SYSTEM )
  3. INSPECT BATTERY 

    Standard specific gravity: 

    1.25 to 1.29 at 20°C (68°F) 

  4. INSPECT AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY 
    1. Remove the air cleaner filter element from the air cleaner case.
    2. Visually check that there is no dirt, clog, and damage to the air cleaner filter element.

      HINT:

      • If there is any dirt or a clog on the air cleaner filter element, clean it with compressed air.
      • If any dirt or a clog remains even after cleaning the air cleaner filter element with compressed air, replace it.
  5. INSPECT SPARK PLUG  (See INSPECTION )
  6. INSPECT IGNITION TIMING 
    1. Set the vehicle to inspection mode (See REPAIR INSTRUCTION ).
    2. Warm up the engine.
    3. When using the intelligent tester:
      1. Connect the intelligent tester (with CAN VIM) to the DLC3.
      2. Enter DATA LIST MODE on the intelligent tester.

        Ignition timing: 

        8 to 12° BTDC 

        NOTE:
        • Turn all the electrical systems off.
        • Inspect the engine idle speed with the cooling fan off.

        HINT:

        Refer to the intelligent tester operator's manual if you need help to select DATA LIST.

      3. Check that the ignition timing advances immediately when the engine speed is increased.
    4. When not using the intelligent tester:
      1. Using SST, connect terminals 13 (TC) and 4 (CG) of the DLC3.

        SST 09843-18040 

        NOTE:
        • Make sure of the terminal numbers before connecting them. Connection with a wrong terminal can damage the engine.
        • Turn off all electrical systems before connecting the terminals.
        • Perform this inspection after the cooling fan motor is turned off.
          Fig 1: Connecting Terminals (TC) And (CG) Of DLC3
          G05200282Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Pull out the red-colored wire harness as shown in the illustration.
      3. Connect the tester terminal of the timing light to the engine.
        NOTE: Use a timing light which detects the first signal.
      4. Inspect ignition timing at idle.

        Ignition timing: 

        8 to 12° BTDC 

        NOTE: When checking the ignition timing, the transmission is in neutral.
        Fig 2: Locating Tester Terminal Of Timing Light To Engine
        G05200283Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        HINT:

        Run the engine at 1,000 to 1,300 rpm for 5 seconds, check that the engine rpm returns to idle speed.

      5. Disconnect terminals 13 (TC) and 4 (CG) of the DLC3.
      6. Inspect ignition timing at idle.

        Ignition timing: 

        7 to 24° BTDC 

      7. Confirm that the ignition timing advances when the engine rpm is increased.
      8. Remove the timing light.
  7. INSPECT ENGINE IDLE SPEED 
    1. Set the vehicle to inspection mode (See REPAIR INSTRUCTION ).
    2. Warm up the engine.
    3. Connect the intelligent tester (with CAN VIM) to the DLC3.
    4. Enter DATA LIST MODE on the intelligent tester.

      Idle speed: 

      850 to 950 rpm. 

      NOTE:
      • When checking the idle speed, the transmission is in neutral.
      • Check the idle speed with the cooling fan off.
      • Switch off all accessories and air conditioning before connecting the intelligent tester.

      HINT:

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

  8. INSPECT COMPRESSION 
    1. Set the vehicle to inspection mode (See REPAIR INSTRUCTION ).
    2. Warm up and stop the engine.
    3. Remove the intake air surge tank (See REMOVAL ).
      NOTE: If the throttle body connector is disconnected because the DTC is detected in inspection, always reconnect it.
    4. Disconnect the injector connectors.
    5. Remove the ignition coils.
      NOTE: If the ignition coil assembly connector is disconnected because the DTC is detected in inspection, always reconnect it.
    6. Remove the spark plugs.
    7. Inspect cylinder compression pressure.
      1. Insert a compression gauge into the spark plug hole.
      2. Connect the intelligent tester (with CAN VIM) to the DLC3.
        NOTE: Check the fully charged battery to indicate HV battery voltage in ECU data monitor.
        Fig 3: Checking Compression Pressure
        G05200284Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      3. Enter ACTIVE TEST MODE on the intelligent tester.
      4. While cranking the engine, measure the compression pressure.

        Compression pressure: 

        0.98 MPa (10 kgf/cm 2  , 142 psi) 

        Minimum pressure: 

        0.74 MPa (7.5 kgf/cm 2  , 107 psi) 

        Difference between each cylinder: 

        100 kPa (1.0 kgf/cm 2  , 15 psi) 

        NOTE:
        • Check other cylinder's compression pressure in the same way.
        • This measurement must be done as quickly as possible.
        • After performing all the procedures, be sure to clear DTCs stored in the memory. Then, check that the normal system code is output.
      5. 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 past the gasket.
  9. INSPECT CO/HC 
    1. Set the vehicle to inspection mode (See REPAIR INSTRUCTION ).
    2. Start the engine.
    3. Run the engine at 2,500 rpm for approximately 180 seconds.
    4. Insert the CO/HC meter testing probe at least 40 cm (1.3 ft) into the tailpipe during idling.
    5. Check CO/HC concentration at idle and/or 2,500 rpm.

      HINT:

      When doing the 2 mode (with the engine is in the idle and 2,500 rpm) test, the measuring procedures are prescribed by the applicable local regulations. If the CO/HC concentration does not comply with regulations, troubleshoot in the order given below.

      Fig 4: Checking Co/Hc Concentration At Idle
      G05200285Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Check heated oxygen sensor operation (See INSPECTION ).
      2. Check heated air fuel ratio sensor operation (See INSPECTION ).
      3. See the table below for possible causes, and then inspect and repair the applicable causes if necessary.
        PROBLEM CAUSES CHART

        CO HC Problems Causes
        Normal High Rough idle
        1. Faulty ignitions:
          • 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 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 filter
        2. Plugged PCV valve
        3. Faulty EFI systems:
          • Faulty pressure regulator
          • Defective water temperature sensor
          • Defective mass air-flow meter
          • Faulty ECM
          • Faulty injectors
          • Faulty throttle position sensor
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