DTC P0571: Brake Switch "A" Circuit: Description
WARNING: This page is about a different car, the 2011 Toyota Corolla. However, it is still accessible from the selected car via links, so may be relevant.
When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. When the ECM receives this signal, it cancels the cruise control. The fail-safe function operates to enable normal driving even if there is a malfunction in the stop light signal circuit. The cancellation condition occurs when voltage is applied to terminal STP. When the brake is applied, voltage is normally applied to terminal STP of the ECM through the STOP fuse and the stop light switch assembly, and the ECM turns the cruise control off.
| DTC No. | DTC Detection Condition | Trouble Area |
|---|---|---|
| P0571 | When voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for 0.5 sec. or more |
|