P0571

Circuit Description

The Cruise Control Brake switch and the cruise clutch switch are normally closed switches. When the Cruise Brake switch or the cruise clutch switch are closed, the PCM senses ignition voltage on the Cruise Control release signal circuit. The PCM compares this signal to the signal received from the other clutch and brake switches. If these switches do not agree this DTC will set.

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 10 mph.

Conditions for Setting the DTC

^ The PCM senses this switch is not toggling as compared with other brake switch inputs.
^ The condition is present for 20 accel/decel cycles.

Action Taken When the DTC Sets

^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as Fail Records data only. This information will not be stored as Freeze Frame data.

Conditions for Clearing the MIL/DTC

^ A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ DTC can be cleared by using the scan tool Clear Info function.

Diagnostic Aids

Important: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing/replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion. Perform the following in order to adjust the Cruise Control Brake switch:

1. With the brake pedal depressed, insert the Cruise Control Brake switch into the retainer until the switch body seats in the retainer. You can hear clicks as you push the threaded portion of the switch through the retainer.
2. Slowly pull the brake pedal fully rearward against the stop until you can no longer hear the clicks.

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 Release circuit for a short to B+.