CRUISE CONTROL SYSTEM(for 8NR-FTS), Diagnostic DTC:P057162

DTC Code DTC Name
P057162 Brake Switch "A" Signal Compare Failure

DESCRIPTION

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 cruise control system control of vehicle speed. 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 cancels control of vehicle speed by the cruise control system.

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

P057162

Brake Switch "A" Signal Compare Failure

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

  • Harness or connector

  • ECM

WIRING DIAGRAM

E267669E33

CAUTION / NOTICE / HINT

Note:

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

  • Before replacing the ECM, refer to Service Bulletin.

PROCEDURE

  1. CHECK TERMINAL VOLTAGE (POWER SOURCE OF STOP LIGHT SWITCH ASSEMBLY)

    1. Disconnect the A1 stop light switch assembly connector.

    2. E144327C27

      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A1-2 - Body ground

      Always

      11 to 14 V

      A1-4 - Body ground

      Ignition switch ON

      11 to 14 V

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - BATTERY OR IG2 RELAY)

    OK

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY

    1. Inspect the stop light switch assembly.

      Click hereClick here

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE STOP LAMP SWITCH ASSEMBLY

    Click here

    OK

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

    1. Disconnect the A173 ECM connector.

    2. Disconnect the A1 stop light switch assembly connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A173-10 (ST1-) - A1-3

      Always

      Below 1 Ω

      A173-9 (STP) - A1-1

      Always

      Below 1 Ω

      A173-10 (ST1-) or A1-3 - Body ground

      Always

      10 kΩ or higher

      A173-9 (STP) or A1-1 - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE ECM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)