P0571

Diagnostic Chart:

Wiring Diagram:

CIRCUIT DESCRIPTION
The Torque Converter Clutch (TCC) normally closed brake switch supplies a B+ signal on CKT 420 to the Powertrain Control Module (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
- Switches disagree for 10 consecutive minutes. or
- TCC and cruise control brake switches are not toggling open and closed, during 6 brake applications on same ignition cycle.

ACTION TAKEN WHEN THE DTC SETS
Fourth gear operation in hot mode, and cruise control operation.

CONDITIONS FOR CLEARING THE MIL/DTC
- A History DTC will clear when forty consecutive warm-up cycles that the diagnostic does not fail (coolant temperature has risen 5°C (40°F) from start up coolant temperature and engine coolant temperature exceeds 71°C (160°F) that same ignition cycle.

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
Number(s) below refer to the Step number(s) on the Diagnostic Table.

2. This test simulates brake switch closed or brakes OFF.
3. This test checks the feed circuit.