P0571

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The TCC normally closed brake switch supplies a B+ signal on CKT 420 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 CKT 820 to the PCM when the brake is applied. This is a type D DTC.

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 fourth gear operation in hot mode, and the cruise control operation.

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 feed circuit.