P0571
DTC P0571
CIRCUIT DESCRIPTION
The torque converter clutch (TCC) brake switch/cruise control release signal circuit is incorporated into the stop lamp switch. The TCC brake switch/cruise control release signal circuit portion of the stop lamp switch is a normally closed switch. The stop lamp switch signal circuit portion of the stop lamp switch is a normally open switch. When the brake pedal is released, the PCM detects a high voltage signal on the TCC brake switch/cruise control release signal circuit and a low signal voltage signal on the stop lamp switch signal circuit.
DTC DESCRIPTOR
This diagnostic procedure supports the following DTC:
DTC P0571 Cruise Control Brake Switch Circuit
CONDITIONS FOR RUNNING THE DTC
- The engine speed is greater than 700 RPM.
- The engine operates for greater than 2 seconds.
- The wheel speed is greater than 48 km/h (30 mph) in order to enable the diagnostic. The diagnostic disables when the wheel speed is below 16 km/h (10 mph).
CONDITIONS FOR SETTING THE DTC
- When the brake pedal is released, the PCM detects a high voltage signal on the stop lamp switch signal circuit or when the PCM detects a low voltage signal on the TCC brake switch/cruise control release signal circuit.
- The above conditions are present for 2 seconds.
ACTION TAKEN WHEN THE DTC SETS
- The powertrain control module (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 DTC
- A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
- A history DTC will clear after 40 consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic.
- Use a scan tool in order to clear the DTC.
DIAGNOSTIC AIDS
- Refer to Exterior Lighting Systems Description and Operation in Lighting Systems, in order to avoid a misdiagnosis.
- For an intermittent.
TEST
