Brake booster 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, ECM release idle stop function(Engine start) in order to make proper negative pressure. If this DTC is set, No more idle stop functioning.
If sensor signal input is lower than 0.2V during 0.2 sec, ECM sets DTC P0557.
Item
Detecting Condition
Possible Cause
DTC Strategy
Signal check, low
Poor connection
Open or short to ground in power circuit
Short to ground in signal circuit
BVS
Enable Conditions
Engine ON
Threshold Value
Sensor voltage < 0.2 V
Diagnostic Time
0.2 sec
MIL ON Condition
DTC only