P0571

Diagnostic Chart (Part 1 Of 2):

Diagnostic Chart (Part 2 Of 2):

Schematic:

CIRCUIT DESCRIPTION
The TCC normally closed cruise brake switch supplies a B+ signal on the Brake Switch Input circuit 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 the Stoplamp Switch Input circuit to the PCM when the brake is applied.

CONDITIONS FOR RUNNING THE DTC
^ Brake switches disagree for 10 consecutive minutes.
or
^ TCC and cruise control brake switches are not toggling open and closed, during 6 brake applications on the same ignition cycle.

CONDITIONS FOR SETTING THE DTC
^ Brake switches disagree for 10 consecutive minutes.
or
^ TCC and cruise control brake switches are not toggling open and closed, during 6 brake applications on the same ignition cycle.

ACTION TAKEN WHEN THE DTC SETS
^ The PCM disallows all cruise control inputs.
^ TCC shift schedules may be affected.
^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM records the operating conditions at the time the diagnostic fails. This information stores in the Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
^ The use of a scan tool.

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
The numbers below refer to the step numbers on the diagnostic table:
4. This test checks the teed circuit.
6. This test simulates brake switch closed or brakes ON.