P0571

DTC P0571 Cruise Brake Switch Circuit






Circuit Description

The TCC normally closed brake switch supplies a 8+ signal on to the PCM. The circuit is opened when the brakes are applied. The stop lamp/cruise control normally open brake switch supplies a 8+ signal on to the PCM when the brake is applied.

Conditions for Running the DTC

The vehicle mph is more than 0.

Conditions for Setting the DTC

^ The switches disagree for 10 consecutive minutes.
^ The TCC and the cruise control brake switches are not toggling open and closed, during six brake applications on the same ignition cycle.

Action Taken When the DTC Sets

^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM records the operating conditions at the time the diagnostic fails. This information stores in the Failure Records.

Conditions for Clearing the MIL/DTC

^ A History DTC will clear after forty consecutive warm-up cycles, it this or any other emission related diagnostic does not report any failures.
^ Use of a Scan tool will clear the DTC codes.

Diagnostic Aids

Refer to PCM Intermittent Diagnostic Trouble Codes or Performance. Check the driving habits of the customer and/or unusual traffic conditions (i.e. stop and go, expressway traffic).

Test Description

Number(s) below refer to the step number(s) on the Diagnostic Table.

4. This test checks the feed circuit.
6. This test simulates brake switch closed or brakes ON.