DTC P0571 [LF]: Notes
DTC P0571 (LF) DETECTION CONDITION AND POSSIBLE CAUSE
| DTC P0571 |
Brake switch circuit problem |
| DETECTION CONDITION |
- The PCM monitors changes in input voltage for brake switch No. 1 and No. 2. If the PCM detects that both brake switches No. 1 and No. 2 remain on or off for 15 s
, it determines that the brake switch circuit has a malfunction.
Diagnostic support note
- This is a continuous monitor (other).
- The MIL does not illuminate.
- FREEZE FRAME DATA (Mode 2/Mode 12) is available.
- The DTC is stored in the PCM memory.
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| POSSIBLE CAUSE |
- Brake switch connector or terminals malfunction
- Open circuit in wiring harness between brake switch terminal C and body ground
- Open circuit or short to ground in brake switch power supply circuit
- Short to ground in wiring harness between battery positive terminal and brake switch terminal B
- Brake switch power supply circuit related fuse malfunction
- Open circuit in wiring harness between battery positive terminal and brake switch terminal B
- Short to ground in wiring harness between brake switch terminal D and PCM terminal 1AB
- Short to ground in wiring harness between brake switch terminal A and PCM terminal 1AF
- PCM connector or terminals malfunction
- Brake switch No. 1 signal circuit and No. 2 signal circuit are shorted to each other
- Short to power supply in wiring harness between brake switch terminal D and PCM terminal 1AB
- Open circuit in wiring harness between brake switch terminal D and PCM terminal 1AB
- Open circuit in wiring harness between brake switch terminal A and PCM terminal 1AF
- Brake switch malfunction
- PCM malfunction
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 Courtesy of MAZDA MOTORS CORP.
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