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 throttle actuator to maintain the correct idle speed. Refer to the system diagram to see the functional layout of the system.
Brake Pedal Position Switch
The brake pedal position switch signals the ECM/PCM when the brake pedal is pressed.
Electrical Power Steering (EPS) Signal (with EPS control)
The EPS signals the ECM/PCM when the power steering load is high.
Power Steering Pressure (PSP) Switch (without EPS control)
The PSP switch signals the ECM/PCM when the power steering load is high.