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Home >> Mazda >> 2007 >> 6 Mazdaspeed >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System L3 With TC] >> DTC P0571 >> Diagnostic procedure
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Diagnostic procedure

DTC P0571 DIAGNOSTIC PROCEDURE

STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has the FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on the repair, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Check for related Service Bulletins and/or online repair information availability.
  • Is any related repair information available?
 Yes Perform the 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.
3 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.
  • Is the DTC P0703 also present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No Go to the next step.
4 INSPECT BRAKE SWITCH CONNECTOR FOR POOR CONNECTION 
  • Turn the ignition switch off.
  • Disconnect the brake switch connector.
  • Inspect for poor connection (such as damaged, pull-out pins, corrosion).
  • Is there any malfunction?
 Yes Repair or replace the terminal, then go to Step 10.
No Go to the next step.
5 INSPECT BRAKE SWITCH 
  • Inspect the brake switch.
  • Is the brake switch normal?
 Yes Go to the next step.
No Replace the brake switch, then go to Step 10.
6 INSPECT GROUND CIRCUIT OF BRAKE SWITCH NO. 2 FOR OPEN CIRCUIT 
  • Inspect for continuity between brake switch terminal C (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit, then go to Step 10.
7 INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH NO. 2 FOR SHORT TO GROUND 
  • Inspect for continuity between brake switch terminal A (wiring harness-side) and body ground.
  • Is there continuity?
 Yes Repair or replace the wiring harness for a short to ground circuit, then go to Step 10.
No Go to the next step.
8 INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH NO. 2 FOR OPEN CIRCUIT 
  • Inspect for continuity between brake switch terminal A (wiring harness-side) and instrument cluster terminal 3T (wiring harness-side).
  • Is there continuity?
 Yes Go to the next step.
No Repair or replace the wiring harness for an open circuit, then go to Step 10.
9 INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH NO. 2 FOR SHORT TO POWER 
  • 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 short to power supply, then go to the next step.
No Go to the next step.
10 VERIFY TROUBLESHOOTING OF P0571 COMPLETED 
  • Make sure to reconnect all disconnected connectors.
  • Clear the DTC from the PCM memory using the WDS or equivalent.
  • Turn the ignition switch to the ON position (Engine off).
  • Depress and release the brake pedal more than 5 times. 
  • Is the same DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION ).
No Go to the next step.
11 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE ).
No Troubleshooting completed.
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