CRUISE CONTROL SYSTEM, Diagnostic DTC:P0571

DTC Code DTC Name
P0571 Brake Switch "A" Circuit

DESCRIPTION

When the brake pedal is depressed, the stop light switch assembly sends a signal to the ECM. Upon receiving the signal, the ECM cancels the cruise control system.

DTC No. Detection Item DTC Detection Condition Trouble Area
P0571 Brake Switch "A" Circuit When voltage of STP terminal and that of ST1- terminal of ECM are less than 1 V for 0.5 seconds or more

  • Stop light switch assembly

  • ECM

  • Harness or connector

WIRING DIAGRAM

B00270GE01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY)


    1. B002952C05
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

      Disconnect the stop light switch assembly connector.

    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A35-2 - Body ground Always 11 to 14 V
      A35-4 - Body ground Ignition switch ON 11 to 14 V
      A35-4 - Body ground Ignition switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Remove the stop light switch assembly.

      Click here

    2. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)


    1. for 2TR-FE


      1. B0024L0C04
        *a

        Front view of wire harness connector

        (to ECM)

        Disconnect the ECM connector.

      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        G46-11 (ST1-) - Body ground Ignition switch ON, brake pedal depressed Below 1.5 V
        Ignition switch ON, brake pedal released 7.5 to 14 V
        G46-10 (STP) - Body ground Brake pedal depressed 7.5 to 14 V
        Brake pedal released Below 1.5 V

    2. for 1KD-FTV


      1. B0026V4C01
        *a

        Front view of wire harness connector

        (to ECM)

        Disconnect the ECM connector.

      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        G83-14 (ST1-) - Body ground Ignition switch ON, brake pedal depressed 0 to 1.5 V
        Ignition switch ON, brake pedal released 7.5 to 14 V
        G83-15 (STP) - Body ground Brake pedal depressed 7.5 to 14 V
        Brake pedal released 0 to 1.5 V

    3. for 1GD-FTV, 2GD-FTV


      1. B0024L0C05
        *a

        Front view of wire harness connector

        (to ECM)

        Disconnect the ECM connector.

      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        G86-12 (ST1-) - Body ground Ignition switch ON, brake pedal depressed 0 to 1.5 V
        Ignition switch ON, brake pedal released 7.5 to 14 V
        G86-13 (STP) - Body ground Brake pedal depressed 7.5 to 14 V
        Brake pedal released 0 to 1.5 V

    4. for 1GR-FE


      1. B0025HZC01
        *a

        Front view of wire harness connector

        (to ECM)

        Disconnect the ECM connector.

      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage
        Tester Connection Condition Specified Condition
        G88-34 (ST1-) - Body ground Ignition switch ON, brake pedal depressed Below 1.5 V
        Ignition switch ON, brake pedal released 7.5 to 14 V
        G88-35 (STP) - Body ground Brake pedal depressed 7.5 to 14 V
        Brake pedal released Below 1.5 V
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 1GR-FE: Click here
    REPLACE ECM for 2TR-FE: Click here
    REPLACE ECM for 1GD-FTV: Click here
    REPLACE ECM for 2GD-FTV: Click here
    REPLACE ECM for 1KD-FTV: Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR