Except ES300
Disconnect accelerator position sensor connector. Accelerator position sensor is located on right side of throttle body. Measure resistance between circuits E2 and VC at accelerator pedal position sensor. See Fig 1. On GS300 and SC300, resistance should be 1200-3200 ohms at 68°F (20°C). On GS400, LS400 and SC400, resistance should be 1640-3280 ohms at 68°F (20°C). If resistance is not as specified, replace accelerator pedal position sensor.