WARNING: This page is about a different car, the 2000 Lexus SC 400, 2000 Lexus SC 300, 2000 Lexus LS 400, 2000 Lexus GS 400, and 2000 Lexus GS 300. However, it is still accessible from the selected car via links, so may be relevant.

Throttle control motor consists of a magnetic clutch, throttle position sensor, and a DC motor. ECM calculates optimal throttle valve opening appropriate for respective driving condition and uses throttle control motor to control the opening. Magnetic clutch engages the clutch to enable throttle control motor to open and close throttle valve. If any of following conditions occur, clutch is disengaged to prevent throttle control motor from opening and closing throttle valve.

Cruise main switch is turned off.
CANCEL switch is turned on.
Brake pedal or clutch pedal is pressed.
Parking brake is applied.
Vehicle speed decreases to less than 25 MPH.
Difference between actual and set speeds is 10 MPH.
Vehicle Skid Control (VSC) is activated.
Stoplight switch circuit malfunction.
Electronically controlled throttle system malfunction.
Vehicle speed sensor malfunctions.
Circuit problem occurs.

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.

Safety Warning

Throttle Control Motor

Use the Manual With the Right Hardware

When to See a Mechanic