TL V6-3.2L (2004)
Idle Speed: Description and Operation
Idle Control System
When the engine is cold, the A/C compressor is on, the transmission is in gear, the brake pedal is pressed, the power steering load is high, or the
alternator is charging, the ECM/PCM controls current to the throttle actuator to maintain the correct idle speed.
Brake Pedal Position Switch
The brake pedal position switch signals the ECM/PCM when the brake pedal is pressed.
Power Steering Pressure (PSP) Switch
The PSP switch signals the ECM/PCM when the power steering load is high
