DTC P0571:00 [L3 Turbo]

id0102b7705500

DTC P0571:00

Brake switch circuit malfunction
DETECTION CONDITION
•  The PCM monitors switching in conjunction with brake switches No.1 and No.2. If either No.1 or No.2 do not switch for a continuous five times even though either No.1 or No.2 is switched from off to on or from on to off, P0571:00 is detected.
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
•  Brake switch No.2 malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service 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 off, then to ON (engine off).
•  Perform the DTC Reading Procedure.
•  Is the DTC U0155:00 also present?
Yes
Go to the applicable DTC inspection.
(See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM (L.H.D. (EXCEPT MZR-CD 2.2, MZR 2.0 DISI i-stop))].)
No
Go to the next step.
3
VERIFY RELATED PENDING CODE AND/OR DTC
•  Switch the ignition to off, then to ON (engine off).
•  Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure.
•  Is the PENDING CODE/DTC P0703:00 also present?
Yes
Go to the applicable PENDING CODE or DTC inspection.
(See DTC P0703:00 [L3 Turbo].)
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, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 11.
No
Go to the next step.
5
INSPECT INSTRUMENT CLUSTER CONNECTOR CONDITION
•  Disconnect the instrument cluster connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, and corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 11.
No
Go to the next step.
6
INSPECT BRAKE SWITCH NO.2 GROUND CIRCUIT FOR OPEN CIRCUIT
•  Brake switch and instrument cluster connectors are 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.
7
INSPECT BRAKE SWITCH NO.2 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 NO.2 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 at the brake switch terminal C (wiring harness-side).
•  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 NO.2 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
•  Inspect the instrument cluster.
•  Is there any malfunction?
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 MASTER CYLINDER REMOVAL/INSTALLATION [L3 Turbo].)
11
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Switch the ignition to ON (engine off).
•  Depress the brake pedal above 15 s more than 5 times.
•  Perform the DTC Reading Procedure.
•  Is the same DTC present?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
12
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L3 Turbo].)
No
DTC troubleshooting completed.