Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2006 Lexus SC 430FACTORY OEM SERVICE PROCEDURE

On-Vehicle Inspection

CHECK THROTTLE BODY
1. Check the throttle control motor for operating sound.
  1. Turn the ignition switch ON.
  2. Depress and release the accelerator pedal repeatedly. Check the running sound of the motor. Also, check that there is no friction sound.
    If the operation is not as specified, check the throttle control motor, wiring and ECM (see DTC P2118: THROTTLE ACTUATOR CONTROL MOTOR CURRENT RANGE/PERFORMANCE ).
    
    Fig 1: Checking Running Sound Of Throttle Control Motor
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Check the throttle position sensor.
  1. Connect the hand-held tester to the DLC3.
    
    Fig 2: Connecting Hand-Held Tester To DLC3
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. Turn the ignition switch ON.
  3. Check that the MIL does not illuminates.
  4. Check that the throttle valve opening percentage (THROTTLE POS) of the CURRENT DATA shows the standard value.
    Standard throttle valve opening percentage: 60% or more
    
    If the operation is not as specified, check the throttle control motor wiring and ECM.
CHECK ACCELERATOR PEDAL POSITION SENSOR
1. Connect the hand-held tester to the DLC3.
2. After turning the ignition switch ON, check that the accelerator pedal position sensor voltage in the CURRENT DATA shows the standard value.
  Standard voltage: 0.6 to 1.0 V
  
  If the result is not as specified, replace the accelerator pedal position sensor.

CHECK CAMSHAFT TIMING OIL CONTROL VALVE ASSY

Connect the hand-held tester to the DLC3.

Fig 3: Connecting Hand-Held Tester To DLC3
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch ON.
Start the engine and warm it up.
Select VVT from the ACTIVE TEST menu.

Check the engine speed when the OCV is operated by the hand-held tester.

OK:

CAMSHAFT TIMING OIL CONTROL VALVE ASSY SPECIFIED CONDITION

Condition	Specified Condition
VVT system is OFF (OCV is OFF)	Normal engine speed
VVT system is ON (OCV is ON)	Rough idle or engine stalled

Factory Service Tools

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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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