DTC P0571:00 [MZR 1.6]

id0102h3705500

DTC P0571:00

Brake switch circuit malfunction
DETECTION CONDITION
•  The PCM monitors switching in conjunction with brake switches No.1 and No.2 when vehicle speed is 10 km/h {6.2 mph} or more. 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 check engine light does not illuminate.
•  FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.
•  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
―  Short to ground in wiring harness between battery positive terminal 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 B and body ground
•  PCM connector or terminals malfunction
•  Short to ground in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 1U
―  Brake switch terminal C—PCM terminal 1AF
•  Short to power supply in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 1U
―  Brake switch terminal C—PCM terminal 1AF
•  Open circuit in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 1U
―  Brake switch terminal C—PCM terminal 1AF
•  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
•  Switch the ignition off, then 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 [MZR 1.6].)
No
Go to the next step.
3
INSPECT BRAKE SWITCH CONNECTOR CONDITION
•  Switch the ignition 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 11.
No
Go to the next step.
4
INSPECT BRAKE SWITCH NO.1 POWER SUPPLY CIRCUIT FOR SHORT TO GROUND OR OPEN CIRCUIT
•  Verify that the brake switch connector is disconnected.
•  Measure the voltage at the brake switch terminal A (wiring harness-side).
•  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 blown:
―  Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and brake switch terminal A.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
•  Replace the fuse.
•  If the fuse is damaged:
―  Replace the fuse.
•  If all fuses are normal:
―  Refer to the wiring diagram and verify whether or not there is a common connector between battery positive terminal and brake switch terminal A.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
5
INSPECT BRAKE SWITCH NO.2 GROUND CIRCUIT FOR OPEN CIRCUIT
•  Verify that the 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
Refer to the wiring diagram and verify whether or not there is a common connector between brake switch terminal B and body ground.
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Inspect for the following:
―  Open circuit between brake switch and body ground
―  Loose or lifting ground point
•  Repair or replace the malfunctioning part.
Go to Step 11.
6
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 11.
No
Go to the next step.
7
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND
•  Verify that the brake switch and PCM connectors are disconnected.
•  Inspect for continuity between the following terminals (wiring harness-side) and body ground:
―  Brake switch terminal D
―  Brake switch terminal C
•  Is there continuity?
Yes
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Brake switch terminal D—PCM terminal 1U
•  Brake switch terminal C—PCM terminal 1AF
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to ground.
Go to Step 11.
No
Go to the next step.
8
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the brake switch and PCM connectors are disconnected.
•  Switch the ignition ON (engine off).
Note
•  Another DTC may be stored by the PCM detecting an open circuit.
•  Measure the voltage at the following terminals (wiring harness-side):
―  Brake switch terminal D
―  Brake switch terminal C
•  Is the voltage 0 V?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Brake switch terminal D—PCM terminal 1U
•  Brake switch terminal C—PCM terminal 1AF
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has a short to power supply.
Go to Step 11.
9
INSPECT BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Verify that the brake switch and PCM connectors are disconnected.
•  Switch the ignition off.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Brake switch terminal D—PCM terminal 1U
―  Brake switch terminal C—PCM terminal 1AF
•  Is there continuity?
Yes
Go to the next step.
No
Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals:
•  Brake switch terminal D—PCM terminal 1U
•  Brake switch terminal C—PCM terminal 1AF
If there is a common connector:
•  Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit.
•  Repair or replace the malfunctioning part.
If there is no common connector:
•  Repair or replace the wiring harness which has an open circuit.
Go to Step 11.
10
INSPECT BRAKE SWITCH
•  Inspect the brake switch.
•  Is there any malfunction?
Yes
Replace the brake switch, then go to the next step.
(See BRAKE PEDAL REMOVAL/INSTALLATION [L.H.D.].)
(See BRAKE PEDAL REMOVAL/INSTALLATION [R.H.D.].)
No
Go to the next step.
11
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Always reconnect all disconnected connectors.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Drive the vehicle at a vehicle speed of 10 km/h {6.2 mph} or more.
•  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.
12
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.6].)
No
DTC troubleshooting completed.