DTC P0571 Brake Switch "A" Circuit: DTC Detecting Condition

DTC DETECTION CONDITION CHART

Item	Detecting Condition	Possible cause
DTC Strategy	PCM detects brake lamp input signal when vehicle stops.	Poor connection Open or short to ground in signal circuit Faulty PCM
Enable conditions	Engine works Vehicle speed signal is normal. Vehicle speed > 20kph (during 1sec or more)
Threshold value	Vehicle speed < 3kph Vehicle acceleration < -6kph/s Brake lamp "OFF" and not changing of brake lamp signal for more 3 sec.
Diagnosis Time	Continuous
MIL On Condition	2 driving cycles