P0571

Circuit Description
The Cruise Control Brake switch is a normally closed switch. When the Cruise Control Brake switch is closed, (brake pedal released) the PCM senses ignition voltage on the Cruise Control Brake switch signal circuit.
If the PCM senses a voltage on the Cruise Control Brake switch signal circuit when the Cruise Control Brake switch should be open, this DTC sets.

Conditions for Running the DTC
^ The engine speed is greater than 700 RPM.
^ The engine operates for greater than 2 seconds.
^ The wheel speed is greater than 30 mph in order to enable the diagnostic. The diagnostic disables when the wheel speed is below 10mph.

Conditions for Setting the DTC
^ The PCM detects voltage on the Cruise Control Brake switch circuit when the Cruise Control Brake switch should be open.
^ All above conditions are present for 1.5 seconds.

Action Taken When the DTC Sets
^ The PCM stores the DTC information into memory when the diagnostic runs and fails.
^ The Malfunction Indicator Lamp (MIL) will not illuminate.
^ The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records.

Conditions for Clearing the MIL/DTC
^ A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ A last test failed (Current DTC) will clear when the diagnostic runs and does not fail.
^ Use a scan tool in order to clear the MIL/DTC.

Diagnostic Aids

Important:
^ Remove any debris from the PCM/TAC module connector surfaces before servicing the PCM/TAC module. Inspect the PCM/TAC module connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM/TAC modules.
^ For any test that requires probing the PCM or a component harness connector, use the Connector Test Adapter kit J 35616-A. Using this kit prevents damage to the harness/component terminals.
^ Test drive the vehicle if a switch or circuit condition cannot be located. An intermittent condition may be duplicated during a test drive.
^ For an intermittent, refer to Symptoms. Symptom Related Diagnostic Procedures

Test Description
The numbers below refer to the step numbers on the diagnostic table.
2. This step determines if the fault is present.
4. This step checks for a Cruise Control Brake Switch circuit for being shorted to B+.