P0571

Electrical Diagram:

CIRCUIT DESCRIPTION

The Cruise Control Brake switch is a normally closed switch. When the Cruise Control Brake switch is closed, 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 SETTING THE DTC

^ Engine speed is greater than 700 RPM.

^ Engine operates for greater than 2.0 seconds.

^ Wheel speed is greater than 30 mph in order to enable the diagnostic. The diagnostic disables when the wheel speed is below 10 mph.

^ The PCM detects voltage on the Cruise Control Brake switch circuit when the Cruise Control Brake switch should be open.

^ The 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.

^ The PCM battery voltage is interrupted.

^ Use a scan tool in order to clear the MIL/DTC.


DIAGNOSTIC AIDS

If you can not find a problem with the ignition feed circuit to the component, inspect the IGN 1 mini relay for operating properly. Probe both sides of the ENG IGN 1 fuse in order to determine if the IGN 1 mini relay is supplying power. Refer to Body and Accessories for further diagnosis of the IGN 1 mini relay.

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 Brake Switch circuit for being shorted to B+.