2006 Lexus GX 470FACTORY OEM SERVICE PROCEDURE

SFI System (2UZ-FE): Inspection

  1. INSPECT MASS AIR FLOW METER 
    1. Check the output voltage.
      1. Apply battery voltage across terminals 3 (+B) and 4 (E2G).
      2. Connect the positive (+) tester prove to terminal 5 (VG), and the negative (-) tester prove to terminal 4 (E2G).
      3. Blow air into the MAF meter, and check if the voltage fluctuates.
    2. Check the resistance.
      1. Using an ohmmeter, measure the resistance between terminals 2 (THA) and 1 (E2).

        Resistance: 

        • 12.5 to 16.9 kΩ at -20°C (-4°F) 
        • 2.19 to 2.67 kΩ at 20°C (68°F) 
        • 0.50 to 0.68 kΩ at 60°C (140°F) 
        Fig 1: Inspecting Mass Air Flow Meter
        G02967481Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        CAMSHAFT TIMING OIL CONTROL VALVE ASSY

        Tester Connection Specified Condition
        1 (+B) - 2 (GND) 6.9 to 7.9 k ohms at 20°C (68°F)

        If the result is not as specified, replace the camshaft timing oil control valve.

    2. Check the operation.
      1. Apply battery voltage across the terminals, and check that the spool valve operates.
        NOTE: Check that the spool valve is not stuck.

        HINT:

        The spool valve may not return if foreign objects are caught in it. This may cause subtle pressure leaks to the advance side, and a DTC may be set.

        Fig 2: Checking Spool Valve Operates
        G02967482Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT THROTTLE W/MOTOR BODY ASSY 
    1. Disconnect the throttle control motor connector.
    2. Using an ohmmeter, measure the motor resistance between terminals M+ and M-.

      Motor resistance: 0.3 to 100 Ω at 20°C (68°F) 

      Fig 3: Inspecting Throttle W/Motor Body Assy
      G02967483Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT KNOCK SENSOR 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Standard: 

        KNOCK SENSOR

        Tester Connection Specified Condition
        1 (Ground) - 2 (Output) 120 to 280 k ohms at 20°C (68°F)

        If the result is not as specified, replace the knock sensor.

        Fig 4: Inspecting Knock Sensor
        G02967484Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT ENGINE COOLANT TEMPERATURE SENSOR 
    1. Check the resistance.
      1. Using an ohmmeter, measure the resistance between the terminals.

        Resistance: 

        • 2.32 to 2.59 k Ω at 20°C (68°F) 
        • 0.310 to 0.326 k Ω at 80°C (176°F) 
        NOTE: If inspecting the water temperature sensor in water, prevent water from flowing into the terminals. After inspection, wipe the water off the sensor.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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