P0571

DTC P0571 Cruise Control Brake Switch Circuit

Circuit Description

The brake switch is installed on the brake pedal bracket. The brake switch 1 (stoplamp pedal switch) is a normally open type switch and the brake switch 2 (cruise release brake pedal switch) is a normally closed type switch. When the brake pedal is pressed the brake switch 1 signal is provided to the ECM and the stoplights are turned ON. Then the brake switch 2 signal to the ECM is stopped (low voltage). If the ECM detects the brake switch signals out of correlation this DTC will set.

Condition for Running the DTC

^ DTCs P0500 P0642 P0643 P0652 and P0653 are not set.
^ The battery voltage is between 10 to 16V.
^ The ignition switch is ON.

Condition for Setting the DTC

^ The ECM detects the brake pedal 1 switch (normally open type switch) signal and brake pedal 2 switch (normally closed type switch) signal correlation error for longer than 3 seconds while heavy braking.

Action Taken When the DTC Sets

^ The ECM illuminates the SVS lamp when the diagnostic runs and fails. Refer to DTC Type Definitions for Action Taken When the DTC Sets - Type C.
^ The ECM inhibits cruise control.
^ The ECM inhibits PTO control.

Condition for Clearing the DTC

^ Refer to DTC Type Definitions for Condition for Clearing the SVS Lamp DTC - Type C.

Diagnostic Aids

^ If an intermittent condition is suspected refer to Intermittent Conditions in this section.
^ Misadjusted brake switch will cause this DTC to set.

Circuit/System Testing DTC P0571