DTC P0571 [L8, LF, L3]

id0102a1809000

DTC P0571 | Brake switch circuit problem
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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 is detected. Diagnostic support note • This is a continuous monitor (Other). • MIL does not comes on. • PENDING CODE is available if PCM detects the above malfunction condition. • FREEZE FRAME DATA is not available. • DTC is stored in PCM memory.
POSSIBLE CAUSE | • Brake switch malfunction • Open circuit between brake switch terminal B and PCM terminal 1AF • Open circuit between brake switch terminal C and body ground • Short to power between brake switch terminal B and PCM terminal 1AF • Short to ground circuit between brake switch terminal B and PCM terminal 1AF • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR 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 WDS or equivalent to the DLC-2. • Turn the ignition switch to the ON position (Engine off). • Verify stored the DTC. • Is the DTC U0155 stored? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Go to the next step.
4 | 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. • Is the DTC P0703 also present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Go to the next step.
5 | INSPECT BRAKE SWITCH CONNECTOR FOR POOR CONNECTION • 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 terminal, then go to Step 11.
No | Go to the next step.
6 | INSPECT BRAKE SWITCH • Inspect the brake switch. • Is the brake switch normal? | Yes | Go to the next step.
No | Replace brake switch, then go to Step 11.
7 | INSPECT GROUND CIRCUIT OF BRAKE SWITCH NO.2 FOR OPEN CIRCUIT • Inspect for continuity between brake switch terminal C (wiring harness-side) and body ground. • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for an open circuit, then go to Step 11.
8 | INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH NO.2 FOR SHORT TO GROUND • Inspect for continuity between brake switch terminal B (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness for short to ground circuit, then go to Step 11.
No | Go to the next step.
9 | INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH NO.2 FOR OPEN CIRCUIT • Inspect for continuity between brake switch terminal B (wiring harness-side) and PCM terminal 1AF (wiring harness-side). • Is there continuity? | Yes | Go to the next step.
No | Repair or replace the wiring harness for an open circuit, then go to Step 11.
10 | INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH NO.2 FOR SHORT TO POWER • Turn the ignition switch to the ON position (Engine off). • Measure the voltage between brake switch terminal A (wiring harness-side) and body ground. • Is the voltage B+? | Yes | Repair or replace the wiring harness for short to power supply, then go to the next step.
No | Go to the next step.
11 | VERIFY TROUBLESHOOTING OF P0571 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the WDS or equivalent. • Turn the ignition switch to the ON position (Engine off). • Depress and release the brake pedal more than 5 times. • Is the same DTC present? | Yes | Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L8, LF, L3].)
No | Go to the next step.
12 | VERIFY AFTER REPAIR PROCEDURE • Perform “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.