P0571

DTC P0571 Cruise Brake Switch Circuit






Circuit Description

The TCC normally closed brake switch supplies a B+ signal on CKT 81O to the PCM. The circuit is opened when the brakes are applied. The stop lamp/cruise control normally open brake switch supplies a B+ signal on CKT 22 to the PCM when the brake is applied. This is a type D DTC.

Conditions for Setting the DTC

^ Switches disagree for 1O consecutive minutes.
or
^ TCC and cruise control brake switches are not toggling "open" and "closed" during 6 brake applications on same ignition cycle.

Action Taken When the DTC Sets

Fourth gear operation in hot mode, and cruise control operation.

Conditions for Clearing the MIL/DTC

^ A History DTC will clear when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (16O°F) that same ignition cycle).
^ Use of a scan.

Diagnostic Aids

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

Test Description

Number(s) below refer to the number(s) on the diagnostic table.

3. This test simulates brake switch closed or brakes "OFF".

4. This test checks the feed circuit.