DTC P0571 [13B-MSP]
id0102g1809000
DTC P0571 |
Brake switch No.2 input circuit problem |
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DETECTION CONDITION
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• 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 is detected.
Diagnostic support note
• This is a continuous monitor (other).
• The MIL does not illuminate.
• FREEZE FRAME DATA is not available.
• The DTC is stored in the PCM memory.
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POSSIBLE CAUSE
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• Connector or terminal malfunction
• Open circuit in wiring harness between battery positive terminal and brake switch terminal B
• Short to ground in wiring harness between battery positive terminal and brake switch terminal B
• Short to ground in wiring harness between brake switch terminal D and DSC HU/CM terminal N
• Short to power supply in wiring harness between brake switch terminal D and DSC HU/CM terminal N
• Brake switch malfunction
• Open circuit in wiring harness between brake switch terminal D and DSC HU/CM terminal N
• DSC HU/CM malfunction
• PCM malfunction
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Diagnostic procedure
STEP |
INSPECTION |
ACTION |
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1
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VERIFY RELATED SERVICE INFORMATION AVAILBAILITY
• Verify related Service information availability.
• Is any related Service information available?
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Yes
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Perform repair or diagnosis according to th available Service information.
• If the vehicle is not repaired, go to the next step.
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No
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Go to the next step.
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2
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VERIFY RELATED PENDING CODE OR STORED DTC
• Turn the ignition switch off, then to the ON position (engine off).
• Verify the related PENDING CODE or stored DTCs.
• Are other DTCs present?
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Yes
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Go to the appropriate DTC inspection.
(See DTC TABLE [13B-MSP].)
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No
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Go to the next step.
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3
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INSPECT BRAKE SWITCH CONNECTOR FOR POOR CONNECTION
• 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?
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Yes
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Repair or replace the terminal, then go to Step 11.
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No
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Go to the next step.
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4
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INSPECT BRAKE SWITCH POWER CIRCUIT FOR OPEN CIRCUIT OR SHORT TO GROUND
• Turn the ignition switch to the ON position (engine off).
• Measure the voltage between brake switch terminal B (wiring harness-side) and body ground.
• Is the voltage B+?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for a possible open circuit or short to ground, then go to Step 11.
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5
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INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
• Turn the ignition switch off.
• Inspect for continuity between brake switch terminal D (wiring harness-side) and body ground.
• Is there continuity?
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Yes
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Repair or replace the wiring harness for a possible short to ground, then go to Step 11.
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No
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Go to the next step.
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6
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INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY
• Turn the ignition switch to the ON position (engine off).
• Measure the voltage between brake switch terminal D (wiring harness-side) and body ground.
• Is the voltage B+?
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Yes
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Repair or replace the wiring harness for a possible short to power supply, then go to Step 11.
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No
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Go to the next step.
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7
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INSPECT BRAKE SWITCH
• Inspect the brake switch.
(See BRAKE SWITCH INSPECTION.)
• Is there any malfunction?
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Yes
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Replace the brake switch, then go to Step 11.
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No
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Go to the next step.
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8
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INSPECT DSC HU/CM CONNECTOR FOR POOR CONNECTION
• Turn the ignition switch off.
• Disconnect the DSC HU/CM connector.
• Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
• Is there any malfunction?
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Yes
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Repair or replace the terminal, then go to Step 11.
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No
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Go to the next step.
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9
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INSPECT BRAKE SWITCH SIGNAL CIRCUIT FOR OPEN CIRCUIT
• Turn the ignition switch off.
• Inspect for continuity between the following circuit:
• Is there continuity?
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Yes
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Go to the next step.
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No
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Repair or replace the wiring harness for a possible open circuit, then go to Step 11.
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10
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INSPECT DSC HU/CM
• Inspect the DSC HU/CM.
(See DSC HU/CM INSPECTION.)
• Is there any malfunction?
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Yes
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Replace the DSC HU/CM, then go to the next step.
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No
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Go to the next step.
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11
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VERIFY TROUBLESHOOTING OF DTC P0571 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear the DTC from the PCM memory using the M-MDS.
• Start the engine.
• Operate the brake pedal.
• Is the same DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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12
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VERIFY AFTER REPAIR PROCEDURE
• Perform the “AFTER REPAIR PROCEDURE”.
• Are any DTCs present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [13B-MSP].)
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No
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DTC troubleshooting completed.
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