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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 DC-DC converter is charging, the PCM controls current to the throttle actuator to maintain the correct idle speed.

Brake Pedal Position Switch

The brake pedal position switch signals the PCM when the brake pedal is pressed.

Electrical Power Steering (EPS) Signal

The EPS signals the PCM when the power steering load is high.

Idle Stop Switch

The idle stop switch signals the PCM when the brake pedal is pressed.