P0571

Diagnostic Chart:

Wiring Chart:

CIRCUIT DESCRIPTION

The TCC normally closed 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 tamp/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 SETTING THE DTC

^ The switches disagree for 10 consecutive minutes.

or

^ The TCC and the cruise control brake switches are not toggling open and closed, during six brake applications on the same ignition cycle.

ACTION TAKEN WHEN THE DTC SETS

^ 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 will clear after forty consecutive warm-up cycles during which the diagnostic does not fail (the coolant temperature has risen 5°C (40°F) from the start up coolant temperature and the engine coolant temperature exceeds 71°C (160°F) during that same ignition cycle.

^ Use of a Scan tool will clear the DTC codes.

DIAGNOSTIC AIDS

Refer to PCM Intermittent Diagnostic Trouble Codes or Performance. Check the driving habits of the customer and/or unusual traffic conditions (i.e. stop and go, expressway traffic).

TEST DESCRIPTION

The number(s) below refer to the step number(s) on the Diagnostic Table.

2. This test simulates brake switch closed or the brakes as being OFF.

3. This test checks the teed circuit.