DTC P0571:00 [SKYACTIV-G 2.0]

id0102h1705500

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 illuminates if the PCM detects the above malfunction condition during the first drive cycle.
•  FREEZE FRAME DATA (Mode 2)/Snapshot data is not available.
•  The DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION
—
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.
•  Communication error between instrument cluster and PCM
•  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 STOP 15 A fuse and brake switch terminal A
―  STOP 15 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
•  Instrument cluster connector or terminals malfunction
•  Short to ground in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 2G
―  Brake switch terminal C—PCM terminal 2R
―  Brake switch terminal C—Instrument cluster terminal 2N
•  PCM connector or terminals malfunction
•  Short to power supply in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 2G
―  Brake switch terminal C—PCM terminal 2R
―  Brake switch terminal C—Instrument cluster terminal 2N
•  Open circuit in wiring harness between the following terminals:
―  Brake switch terminal D—PCM terminal 2G
―  Brake switch terminal C—PCM terminal 2R
―  Brake switch terminal C—Instrument cluster terminal 2N
•  Brake switch malfunction
•  Instrument cluster 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 DTC U0073:00, U0101:00, U0121:00, U0131:00, U0140:00, U0151:00, U0155:00, U0214:00 [SKYACTIV-G 2.0].)
No
Go to the next step.
3
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, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector and/or terminals, then go to Step 12.
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 STOP 15 A fuse.
•  If the fuse is blown:
―  Repair or replace the wiring harness for a possible short to ground.
―  Replace the fuse.
•  If the fuse is deteriorated:
―  Replace the fuse.
•  If the fuse is normal:
―  Repair or replace the wiring harness for a possible open circuit.
Go to Step 12.
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
Repair or replace the wiring harness for a possible open circuit, then go to Step 12.
6
INSPECT INSTRUMENT CLUSTER CONNECTOR CONDITION
•  Disconnect the instrument cluster 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 12.
No
Go to the next step.
7
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO GROUND
•  Verify that the brake switch and instrument cluster 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
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 12.
No
Go to the next step.
8
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 12.
No
Go to the next step.
9
INSPECT BRAKE SWITCH CIRCUIT FOR SHORT TO POWER SUPPLY
•  Verify that the brake switch, instrument cluster and PCM connectors are disconnected.
•  Switch the ignition to ON (engine off).
•  Measure the voltage at the following terminals (wiring harness-side):
―  Brake switch terminal D
―  Brake switch terminal C
•  Is there any voltage?
Yes
Repair or replace the wiring harness for a possible short to power supply, then go to Step 12.
No
Go to the next step.
10
INSPECT BRAKE SWITCH CIRCUIT FOR OPEN CIRCUIT
•  Verify that the brake switch, instrument cluster and PCM connectors are disconnected.
•  Switch the ignition to off.
•  Inspect for continuity between the following terminals (wiring harness-side):
―  Brake switch terminal D—PCM terminal 2G
―  Brake switch terminal C—PCM terminal 2R
―  Brake switch terminal C—Instrument cluster terminal 2N
•  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 12.
11
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 [R.H.D.].)
No
Replace the instrument cluster, then go to the next step.
(See INSTRUMENT CLUSTER REMOVAL/INSTALLATION.)
12
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 for 15 s and release 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.
13
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [SKYACTIV-G 2.0].)
No
DTC troubleshooting completed.