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Home >> Lexus >> 2006 >> GS 300 AWD >> Repair and Diagnosis >> Engine Performance >> Tune-Up >> Ignition (3GR-FSE) >> Ignition System >> On-Vehicle Inspection

On-Vehicle Inspection

NOTE: In this section, the terms "cold" and "hot" refer to the temperature of the coils. "Cold" means approximately - 10 to 50°C (14 to 122°F). "Hot" means approximately 50 to 100°C (122 to 212°F).
  1. PERFORM SPARK TEST 
    1. Check for DTCs.
      NOTE: If a DTC is present, perform troubleshooting procedures for that DTC.
    2. Check if sparks occur.
      1. Remove the ignition coil.
      2. Remove the spark plug.
      3. Install the spark plug to the ignition coil and connect the ignition coil connector.
      4. Disconnect the 6 injector connectors.
      5. Ground the spark plug.
      6. Visually check that sparks occur while the engine is being cranked.
        NOTE:
        • Be sure to ground the spark plug when checking.
        • If the ignition coil has been struck or dropped, replace it.
        • Do not crank the engine for more than 2 seconds.
    3. Perform the spark test according to the flowchart below.
      1. Check that the wire harness side connector of ignition coil with igniter is securely connected.

        Result 

        RESULT CONDITION DESCRIPTION CHART

        Result Proceed to
        NG  Connect securely 
        OK  Go to next step 
      2. Perform a spark test on each ignition coil with igniter.
        1. Replace ignition coil with igniter with a normal one.
        2. Perform spark test again.

          Result 

          RESULT CONDITION DESCRIPTION CHART

          Result Proceed to
          OK  Replace ignition coil with igniter 
          NG  Go to next step 
      3. Check the power supply to ignition coil with igniter.
        1. Turn the engine switch on (IG).
        2. Check that there is battery voltage at ignition coil positive (+) terminal.

          Result 

          RESULT CONDITION DESCRIPTION CHART

          Result Proceed to
          NG  Check wiring between engine switch and ignition coil with igniter 
          OK  Go to next step 
      4. Check the VVT sensor output voltage.

        Result 

        RESULT CONDITION DESCRIPTION CHART

        Result Proceed to
        NG  Check that there is resistance between ECM and VVT sensor. If there is no resistance, replace VVT sensor. If there is resistance, repair wiring between VVT sensor and ECM 
        OK  Go to next step 
      5. Check the resistance of the crankshaft position sensor.

        Standard resistance 

        STANDARD RESISTANCE TEMPERATURE CHART

        Temperature Specified Condition
        Cold  1,630 to 2,740 Ω 
        Hot  2,065 to 3,225 Ω 

        Result 

        STANDARD RESISTANCE TEMPERATURE CHART

        Result Proceed to
        NG  Replace crankshaft position sensor 
        OK  Go to next step 
      6. Check the IGT signal from the ECM.

        Result 

        STANDARD RESISTANCE TEMPERATURE CHART

        Result Proceed to
        NG  Check ECM 
        OK  Repair wiring between ignition coil and ECM 
    4. Using a 16 mm plug wrench, install the spark plug.

      Torque: 18 N*m (183 kgf*cm, 13 ft.*lbf) 

    5. Install the ignition coils.
  2. CHECK VVT SENSOR OUTPUT VOLTAGE 
    Fig 1: Identifying VVT Sensor Output Voltage
    G04018996Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Turn the engine switch on (IG).
    2. Check the voltage between the terminal.

      Standard voltage 

      STANDARD VOLTAGE CONDITION CHART

      Tester Connection Condition Specified Condition
      E8-29 (VC) - Body ground  Engine switch on (IG)  5 V 
    3. While turning the crankshaft pulley by hand, measure the voltage between each terminal. Check that the voltage changes between the Hi range and Lo range shown in the table below.

      Standard voltage 

      STANDARD VOLTAGE TERMINAL CHART

      Sensor Position Terminal No. Voltage (Hi) Voltage (Lo)
      Bank 1  VVT1+ (E8-21) - VVT1- (E8-20)  3.375 to 4.950 V  0.450 to 1.375 V 
      Bank 2  VVT2+ (E8-19) - VVT2- (E8-18)  3.375 to 4.950 V  0.450 to 1.375 V 
  3. CHECK SPARK PLUG 
    NOTE:
    • Do not use a wire brush for cleaning.
    • Do not attempt to adjust the electrode gap of a used spark plug.
    1. Check the electrode.
      1. Using a mega ohmmeter, measure the insulation resistance.

        Insulation resistance: 

        10 MΩ or more 

        HINT:

        If a mega ohmmeter is not available, perform the following simple inspection instead.

        Fig 2: Measuring Insulation Resistance By Using Mega Ohmmeter
        G04018997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Alternative inspection method:
      1. Quickly accelerate the engine to 4,000 RPM 5 times.
      2. Remove the spark plug.
      3. Visually check the spark plug.

        If the electrode is dry, the spark plug is functioning properly. If the electrode is damp, proceed to the next step.

    3. Check the spark plug for any damage on its threads and insulator.

      HINT:

      If there is damage, replace the spark plug. If not, reinstall the spark plug.

      Fig 3: Identifying Spark Plug
      G04018998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Recommended spark plug 

      SPARK PLUG PRODUCT MANUFACTURER CHART

      Manufacturer Product
      DENSO made  FK20HBR11 
      NGK made  ILFR6D11T 
    4. Check the spark plug electrode gap.

      Maximum electrode gap for used spark plug: 1.3 mm (0.051 in.) 

      If the gap is greater than the maximum, replace the spark plug. 

      Electrode gap for new spark plug: 1.0 to 1.1 mm (0.039 to 0.043 in.) 

      NOTE: If adjusting the gap of a new spark plug, bend only the base of the ground electrode. Do not touch the tip. Never attempt to adjust the gap of a used plug.
      Fig 4: Identifying Spark Plug Electrode Gap
      G04018999Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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