Brake Booster Vacuum Pressure Sensor
Brake booster vacuum pressure sensor, installing on the brake booster, detects negative brake booster pressure in order to prevent abnormal braking from lack of negative pressure in brake booster. In case that negative pressure lacks at idle start status, Engine Control Module (ECM) release idle stop function (Engine start) in order to make proper negative pressure. If this DTC is set, No more idle stop functioning.