Diagnostic procedure

DTC P0571 DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record FREEZE FRAME DATA on repair, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for related Technical Service Bulletin(s) repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY DTC FOR MODULE COMMUNICATION Connect WDS or equivalent to DLC-2. Turn the ignition switch to the ON position (Engine off). Verify stored DTC. Is DTC U0155 stored?	Yes	Go to the applicable DTC inspection. (See DTC TABLE )
3		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 )
4		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.
5		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.
6		No	Replace brake switch, then go to Step 11.
7	INSPECT GND 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.
7		No	Repair or replace the wiring harness for 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.
8		No	Go to the next step.
9	INSPECT INSTRUMENT CLUSTER CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect instrument cluster 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.
9		No	Go to the next step.
10	INSPECT SIGNAL CIRCUIT OF BRAKE SWITCH NO.2 FOR OPEN CIRCUIT Inspect for continuity between brake switch terminal B (wiring harness-side) and instrument cluster terminal 2M (wiring harness-side). Is there continuity?	Yes	Go to the next step.
10		No	Repair or replace the wiring harness for open circuit, then go to Step 11.
11	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 circuit, then go to the next step.
11		No	Go to the next step.
12	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 .)
12		No	Go to the next step.
13	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE ) Is any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE )
13		No	Troubleshooting completed.