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Home >> Mazda >> 2010 >> RX-8 R3, 1.3 2 >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P0571 [13B-MSP]
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DTC P0571 [13B-MSP]

DTC REFERENCE CHART

DTC P0571 Brake switch input circuit problem
DETECTION CONDITION 
  • The PCM monitors the input signal from brake switch No. 1 and brake switch No. 2 when the engine is running. If both input signals remain on or off, the PCM determines that there is a brake switch input circuit problem.

    Diagnostic support note 

    • This is a continuous monitor (other.)
    • The MIL does not illuminate.
    • FREEZE FRAME DATA is not available.
    • The DTC is stored in the PCM memory.
POSSIBLE CAUSE  With ABS HU/CM 
  • Connector or terminal malfunction
  • Open circuit in wiring harness between battery positive terminal and brake switch terminal B
  • Short to ground in wiring harness between battery positive terminal and brake switch terminal B
  • Short to ground in wiring harness between brake switch terminal D and ABS HU/CM terminal Y
  • Short to power supply in wiring harness between brake switch terminal D and ABS HU/CM terminal Y
  • Brake switch malfunction
  • Open circuit in wiring harness between brake switch terminal D and ABS HU/CM terminal Y
  • ABS HU/CM malfunction
  • PCM malfunction

With DSC HU/CM 
  • Connector or terminal malfunction
  • Open circuit in wiring harness between battery positive terminal and brake switch terminal B
  • Short to ground in wiring harness between battery positive terminal and brake switch terminal B
  • Short to ground in wiring harness between brake switch terminal D and DSC HU/CM terminal N
  • Short to power supply in wiring harness between brake switch terminal D and DSC HU/CM terminal N
  • Brake switch malfunction
  • Open circuit in wiring harness between brake switch terminal D and DSC HU/CM terminal N
  • DSC HU/CM malfunction
  • PCM malfunction
G05982341Courtesy of MAZDA MOTORS CORP.
G05982342Courtesy of MAZDA MOTORS CORP.
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 RELATED PENDING CODE OR STORED DTC 
  • Turn the ignition switch off, then to the ON position (engine off.)
  • Verify the related PENDING CODE or stored DTCs.
  • Are other DTCs present?
 Yes Go to the appropriate DTC inspection. (See DTC TABLE [13B-MSP] .)
No Go to the next step.
3 INSPECT BRAKE SWITCH CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch 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, then go to Step 11.
No Go to the next step.
4 INSPECT BRAKE SWITCH NO. 1 POWER CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND 
  • Turn the ignition switch to the ON position (engine off.)
  • Measure the voltage between brake switch terminal B (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 Yes Go to the next step.
No Repair or replace the wiring harness for a possible open circuit or short to ground, then go to Step 11.
5 INSPECT BRAKE SWITCH NO. 1 SIGNAL CIRCUIT FOR SHORT TO GROUND 
  • Turn the ignition switch off.
  • Inspect for continuity between brake switch terminal D (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.
6 INSPECT BRAKE SWITCH NO. 1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY 
  • Turn the ignition switch to the ON position (engine off.)
  • Measure the voltage between brake switch terminal D (wiring harness-side) and body ground.
  • Is the voltage B+  ?
 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.
7 INSPECT BRAKE SWITCH NO. 1  Yes Replace the brake switch, then go to Step 11. (See BRAKE PEDAL REMOVAL/INSTALLATION .)
No Go to the next step.
8 INSPECT ABS HU/CM OR DSC HU/CM CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the ABS HU/CM or DSC HU/CM connector.
  • Inspect for poor connection (such as damaged/pulled-out pins, corrosion.)
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 11.
No Go to the next step.
9 INSPECT BRAKE SWITCH NO. 1 SIGNAL CIRCUIT FOR OPEN CIRCUIT 
  • Turn the ignition switch off.
  • Inspect for continuity between the following circuit:
    • Brake switch terminal D (wiring harness-side) and ABS HU/CM terminal Y (wiring harness-side) (with ABS HU/CM)
    • Brake switch terminal D (wiring harness-side) and DSC HU/CM terminal N (wiring harness-side) (with DSC HU/CM)
  • 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 ABS HU/CM OR DSC HU/CM  Yes Replace the ABS HU/CM or DSC HU/CM, then go to the next step. (See ABS HU/CM REMOVAL/INSTALLATION .) (See DSC HU/CM REMOVAL/INSTALLATION .)
No Go to the next step.
11 VERIFY TROUBLESHOOTING OF DTC P0571 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the M-MDS.
  • Start the engine.
  • Operate the brake pedal.
  • Is the same DTC present?
 Yes Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [13B-MSP] .)
No Go to the next step.
12 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection. (See DTC TABLE [13B-MSP] .)
No DTC troubleshooting completed.
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