DTC P0571:00 [ZJ, ZY]

id0102c0705500

DTC P0571:00

Brake switch circuit malfunction
DETECTION CONDITION
•  The PCM monitors changes in input voltage for brake switch No.1 and No.2 (signal from instrument cluster). If the PCM detects that both brake switches No.1 and No.2 remain on or off for 15 s, it determines that the brake switch circuit has a malfunction.
Diagnostic support note
•  This is a continuous monitor (other).
•  The MIL does not illuminate.
•  FREEZE FRAME DATA is 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
•  Short to ground in wiring harness between brake switch terminal C and PCM terminal 1I
•  PCM connector or terminals malfunction
•  Short to power supply in wiring harness between brake switch terminal C and PCM terminal 1I
•  Open circuit in wiring harness between brake switch terminal C and PCM terminal 1I
•  Brake switch malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
•  Have the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (other related) been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2
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.
3
VERIFY DTC FOR MODULE COMMUNICATION
•  Connect the M-MDS to the DLC-2.
•  Turn the ignition switch to the ON position (engine off).
•  Verify the stored DTC using the M-MDS.
•  Is the DTC U0155:00 also present?
Yes
Go to the applicable DTC inspection.
(See FOREWORD [MULTIPLEX COMMUNICATION SYSTEM].)
No
Go to the next step.
4
VERIFY RELATED PENDING CODE AND STORED DTC
•  Turn the ignition switch off then to the ON position (engine off).
•  Verify the related PENDING CODE and stored DTCs using the M-MDS.
•  Is the DTC P0703:00 also present?
Yes
Go to the applicable DTC inspection.
(See DTC P0703:00 [ZJ, ZY].)
No
Go to the next step.
5
INSPECT BRAKE SWITCH CONNECTOR AND TERMINALS
•  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 connector 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 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
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 connector is disconnected.
•  Inspect for continuity between brake switch terminal C (wiring harness-side) and body ground.
•  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 PCM internal circuit).
Go to Step 11.
No
Go to the next step.
8
INSPECT PCM CONNECTOR AND TERMINALS
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged, pull-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 11.
No
Go to the next step.
9
INSPECT BRAKE SWITCH NO.2 SIGNAL 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 between brake switch terminal C (wiring harness-side) and body ground.
•  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.
10
INSPECT BRAKE SWITCH NO.2 SIGNAL CIRCUIT FOR OPEN CIRCUIT
•  Brake switch and PCM connectors are disconnected.
•  Turn the ignition switch off.
•  Inspect for continuity between brake switch terminal C (wiring harness-side) and PCM terminal 1I (wiring harness-side).
•  Is there continuity?
Yes
Replace the brake switch, then go to the next step.
(See BRAKE PEDAL REMOVAL/INSTALLATION [ZJ, ZY].)
No
Repair or replace the wiring harness for a possible open circuit, then go to the next step.
11
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
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [ZJ, ZY].)
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 [ZJ, ZY].)
No
DTC troubleshooting completed.