P0571

CIRCUIT DESCRIPTION
The TCC Brake switch is a normally closed switch. When the TCC Brake switch is closed, (brake pedal released) the PCM senses ignition voltage on the TOG Brake switch signal circuit.

If the PCM senses a voltage on the TCC Brake switch signal circuit when the TCC 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 48 km/h (30 mph) in order to enable the diagnostic. The diagnostic disables when the wheel speed is below 16 km/h (10 mph).

CONDITIONS FOR SETTING THE DTC
^ The PCM detects voltage on the TCC Brake switch circuit when the TCC 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 DTC
^ A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
^ A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
^ Use a scan tool in order to clear the DTC.

DIAGNOSTIC AIDS

IMPORTANT:
^ Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the modules. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion into the PCM.
^ 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. Refer to Using Connector Test Adapters in Diagrams.
^ 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 Testing for Intermittent and Poor Connections in Diagrams.

TEST DESCRIPTION

Steps 1-6:

Steps 7-10:

The number below refers to the step number on the diagnostic table.
2. This step determines if the fault is present.