DTC P0571:00: Notes

DTC P0571:00	Brake switch circuit problem
DETECTION CONDITION	The PCM monitors changes in input voltage for brake switch No. 1 and No. 2 (signal from instrument cluster). The brake switch circuit malfunction is determined when the following 2 conditions are repeated 5 times or more . Brake switch No. 1 and No. 2 are on or off simultaneously for a continuous 3 s or more . The brake is operated. Diagnostic support note This is a continuous monitor (other). The check engine light does not illuminate. FREEZE FRAME DATA (Mode 2)/Snapshot data is not available. The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	-
POSSIBLE CAUSE	CAUTION: Inspect the brake switch with it installed to the brake pedal, otherwise the brake switch may not operate normally. If the brake switch is removed from the brake pedal, replace the brake switch with a new one. Communication error between instrument cluster and PCM Brake switch connector or terminals malfunction Short to ground or open circuit in brake switch No. 1 power supply circuit Short to ground in wiring harness between STOP 10 A fuse and brake switch terminal A STOP 10 A fuse malfunction Open circuit in wiring harness between battery positive terminal and brake switch terminal A Open circuit in wiring harness between brake switch terminal B and body ground Instrument cluster connector or terminals malfunction Short to ground in wiring harness between the following terminals: Brake switch terminal D-PCM terminal 1AB Brake switch terminal C-Instrument cluster terminal N PCM connector or terminals malfunction Short to power supply in wiring harness between the following terminals: Brake switch terminal D-PCM terminal 1AB Brake switch terminal C-Instrument cluster terminal N Open circuit in wiring harness between the following terminals: Brake switch terminal D-PCM terminal 1AB Brake switch terminal C-Instrument cluster terminal N Brake switch malfunction Instrument cluster malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.