FixVault
Home › Mazda › 2011 › 3 i SV, 2.0 F › Repair and Diagnosis › Engine Performance › System › On-Board Diagnostic [Engine Control System LF, L5] › DTC P0571:00

DTC P0571:00

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). 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)/Snapshot data is not available.
  • The DTC is stored in the PCM memory.
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.
  • Brake switch connector or terminals malfunction
  • 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 brake switch terminal C and instrument cluster terminal 2N
  • Short to power supply in wiring harness between brake switch terminal C and instrument cluster terminal 2N
  • Open circuit in wiring harness between brake switch terminal C and instrument cluster terminal 2N
  • Instrument cluster malfunction
  • Brake switch malfunction
  • PCM malfunction
G07864529
DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related repair information available?
 Yes Perform repair or diagnosis according to the available repair information.
  • If the vehicle is not repaired, go to the next step.
No Go to the next step.
2 VERIFY DTC FOR MODULE COMMUNICATION 
  • Switch the ignition to ON (engine off).
  • Perform the DTC Reading Procedure.

    (See ON-BOARD DIAGNOSTIC TEST ).

  • Is the DTC U0155:00 present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [MULTIPLEX COMMUNICATION SYSTEM] ).
No Go to the next step.
3 VERIFY RELATED PENDING CODE AND STORED DTC 
  • Switch the ignition to off, then to ON (engine off).
  • Perform the DTC Reading Procedure and Pending Trouble Code Access Procedure.

    (See ON-BOARD DIAGNOSTIC TEST ).

  • Is the DTC P0703:00 also present?
 Yes Go to the applicable DTC inspection.
(See DTC P0703:00 ).
No Go to the next step.
4 INSPECT BRAKE SWITCH CONNECTOR CONDITION 
  • Switch the ignition to off.
  • Disconnect the brake switch connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal and/or connector, then go to Step 11.
No Go to the next step.
5 INSPECT BRAKE SWITCH GROUND CIRCUIT FOR OPEN CIRCUIT 
  • Brake switch connector is disconnected.
  • Inspect for continuity between brake switch terminal B (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to Step 11.
6 INSPECT INSTRUMENT CLUSTER CONNECTOR CONDITION 
  • Disconnect the instrument cluster connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal and/or connector, then go to Step 11.
No Go to the next step.
7 INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Brake switch and instrument cluster connectors are disconnected.
  • Inspect for continuity between brake switch terminal C (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace the wiring harness for a possible short to ground, then go to Step 11.
No Go to the next step.
8 INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Brake switch and instrument cluster connectors are disconnected.
  • Switch the ignition to ON (engine off).
  • Measure the voltage between brake switch terminal C (wiring harness-side) and body ground.
  • Is there any voltage?
 Yes Repair or replace the wiring harness for a possible short to power supply, then go to Step 11.
No Go to the next step.
9 INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Brake switch and instrument cluster connectors are disconnected.
  • Switch the ignition to off.
  • Inspect for continuity between brake switch terminal C (wiring harness-side) and instrument cluster terminal 2N (wiring harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit, then go to Step 11.
10 INSPECT INSTRUMENT CLUSTER 
 Yes Replace the instrument cluster, then go to the next step.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION ).
No Replace the brake switch, then go to the next step.
(See BRAKE PEDAL REMOVAL/INSTALLATION ).
11 VERIFY DTC TROUBLESHOOTING COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.

    (See AFTER REPAIR PROCEDURE ).

  • Switch the ignition to ON (engine off).
  • Depress and release the brake pedal more than 5 times  .
  • Perform the DTC Reading Procedure.

    (See ON-BOARD DIAGNOSTIC TEST ).

  • Is the same DTC present?
 Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
12 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No DTC troubleshooting completed.
About FixVault