2006 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

SFI System: Inspection

  1. INSPECT MASS AIR FLOW METER 
    1. Check the output voltage.
      1. Apply battery voltage across terminals 1 (+B) and 2 (EVG).
      2. Using a voltmeter, connect the positive (+) tester probe to terminal 3 (VG), and negative (-) tester probe to terminal 2 (EVG).
      3. Blow air into the MAF meter, and check that the voltage fluctuates.
    2. Measure the resistance between terminals 4 (THA) and 5 (ETHA).

      Standard: 

      MASS AIR FLOW METER SPECIFIED CONDITION

      Condition Specified Condition
      -20°C (-4°F) 13.6 to 18.4 k ohms
      20°C (68°F) 2.21 to 2.69 k ohms
      60°C (140°F) 0.493 to 0.667 k ohms

      If the result is not as specified, replace the MAP meter.

      Fig 1: Inspecting Mass Air Flow Meter
      G02957868Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT ACCELERATOR PEDAL ROD ASSY 
    1. Measure the resistance between the terminals.

      Standard: 

      ACCELERATOR PEDAL ROD ASSY SPECIFIED CONDITION

      Tester Connection Specified Condition
      4 (VCP1) - 1 (EP1) 5.0 k ohms or less
      6 (VCP2) - 3 (EP2) 5.0 k ohms or less
      5 (VPA1) - 1 (EP1) 1.5 to 6.0 k ohms
      2 (VPA2) - 3 (EP2) 1.5 to 6.0 k ohms

      If the result is not as specified, replace the pedal assy.

      Fig 2: Inspecting Accelerator Pedal Rod Assy
      G02957869Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT THROTTLE ACTUATOR 
    1. Disconnect the throttle actuator connector.
    2. Measure the throttle actuator resistance between terminals 2 (M+) and 1 (M-).

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

      If the result is not as specified, replace the throttle body.

    3. Connect the throttle actuator connector.
      Fig 3: Inspecting Throttle Actuator
      G02957870Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT THROTTLE POSITION SENSOR 
    1. Disconnect the throttle position sensor connector.
    2. Measure the resistance between terminals 1 (VC) and 4 (E2).

      Resistance: 1.25 to 2.35 kΩ at 20°C (68°F) 

      If the result is not as specified, replace the throttle position sensor.

    3. Connect the throttle position sensor connector.
      Fig 4: Inspecting Throttle Position Sensor
      G02957871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT CAMSHAFT TIMING OIL CONTROL VALVE ASSY 
    1. Measure the resistance between the terminals.

      Resistance: 6.9 to 7.9 Ω at 20°C (68°F) 

    2. Connect the battery's positive (+) lead to terminal 1 and negative (-) lead to terminal 2, and check the movement of the valve.

      OK: 

      Fig 5: Camshaft Timing Oil Control Valve Assy Table
      G02957873Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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When to See a Mechanic

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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