DTC P0571:00 [MZR 1.3, MZR 1.5]

id0102f8705500

DTC P0571:00

Brake switch circuit problem
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
•  Short to ground or open circuit in brake switch No.1 power supply circuit
―  ATX, CVT:
•  Short to ground in wiring harness between MAIN 200 A fuse and brake switch terminal B
•  MAIN 200 A fuse and/or STOP 10 A fuse malfunction
•  Open circuit in wiring harness between battery positive terminal and brake switch terminal B
―  MTX:
•  Short to ground in wiring harness between MAIN 200 A fuse and brake switch terminal A
•  MAIN 200 A fuse and/or STOP 10 A fuse malfunction
•  Open circuit in wiring harness between battery positive terminal and brake switch terminal A
•  Open circuit in wiring harness between brake switch terminal C and body ground (ATX, CVT)
•  Open circuit in wiring harness between brake switch terminal B and body ground (MTX)
•  Short to ground in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 1G
―  Brake switch terminal A—PCM terminal 1I (ATX, CVT)
―  Brake switch terminal C—PCM terminal 1I (MTX)
•  PCM connector or terminals malfunction
•  Short to power supply in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 1G
―  Brake switch terminal A—PCM terminal 1I (ATX, CVT)
―  Brake switch terminal C—PCM terminal 1I (MTX)
•  Open circuit in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 1G
―  Brake switch terminal A—PCM terminal 1I (ATX, CVT)
―  Brake switch terminal C—PCM terminal 1I (MTX)
•  Brake switch 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 RELATED PENDING CODE AND/OR DTC
•  Turn the ignition switch off, then to the ON position (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 [MZR 1.3, MZR 1.5].)
No
Go to the next step.
3
INSPECT BRAKE SWITCH CONNECTOR CONDITION
•  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 connector and/or terminals, then go to Step 10.
No
Go to the next step.
4
INSPECT BRAKE SWITCH NO.1 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT
•  Brake switch connector is disconnected.
•  Measure the voltage at the brake switch terminal B (wiring harness-side). (ATX, CVT)
•  Measure the voltage at the brake switch terminal A (wiring harness-side). (MTX)
•  Is the voltage B+?
Yes
Go to the next step.
No
Inspect the MAIN 200 A fuse and STOP 10 A fuse.
•  If the fuse is melted:
―  Repair or replace the wiring harness for a possible short to ground.
―  Replace the malfunctioning fuse.
•  If the fuse is deteriorated:
―  Replace the malfunctioning fuse.
•  If all fuses are normal:
―  Repair or replace the wiring harness for a possible open circuit.
Go to Step 10.
5
INSPECT BRAKE SWITCH NO.2 GROUND CIRCUIT FOR OPEN CIRCUIT
•  Brake switch connector is disconnected.
•  Inspect for continuity between brake switch terminal C (wiring harness-side) and body ground. (ATX, CVT)
•  Inspect for continuity between brake switch terminal B (wiring harness-side) and body ground. (MTX)
•  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 10.
6
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND
•  Brake switch connector is disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Brake switch terminal D
―  Brake switch terminal A (ATX, CVT)
―  Brake switch terminal C (MTX)
•  Is there continuity?
Yes
If the short to ground circuit could be detected:
•  Repair or replace the wiring harness for a possible short to ground.
If the short to ground circuit could not be detected:
•  Replace the PCM (short to ground in the PCM internal circuit).
Go to Step 10.
No
Go to the next step.
7
INSPECT PCM CONNECTOR CONDITION
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 10.
No
Go to the next step.
8
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
•  Brake switch and PCM connectors are disconnected.
•  Turn the ignition switch to the ON position (engine off).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Brake switch terminal D
―  Brake switch terminal A (ATX, CVT)
―  Brake switch terminal C (MTX)
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 10.
No
Go to the next step.
9
INSPECT BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Brake switch and PCM connectors are disconnected.
•  Turn the ignition switch off.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Brake switch terminal D—PCM terminal 1G
―  Brake switch terminal A—PCM terminal 1I (ATX, CVT)
―  Brake switch terminal C—PCM terminal 1I (MTX)
•  Is there continuity?
Yes
Replace the brake switch, then go to the next step.
(See BRAKE PEDAL REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
10
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Turn the ignition switch to the ON position (engine off).
•  Depress and release the brake pedal more than 5 times.
•  Perform the DTC Reading Procedure.
•  Is the same DTC present?
Yes
Repeat the inspection from Step 1.
•  If the malfunction recurs, replace the PCM.
Go to the next step.
No
Go to the next step.
11
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.3, MZR 1.5].)
No
DTC troubleshooting completed.