SFI SYSTEM, Diagnostic DTC:P0724

DTC Code DTC Name
P0724 Brake Switch "B" Circuit High

DESCRIPTION

This DTC indicates that the stop light switch remains on. When the stop light switch remains on during GO and STOP driving, the ECM interprets this as a fault in the stop light switch. Then the MIL illuminates and the ECM stores the DTC.

DTC No.

DTC Detection Condition

Trouble Area

P0724

The stop light switch remains on even when the vehicle is driven in a GO (30 km/h (18.63 mph) or more) and STOP (less than 3 km/h (1.86 mph)) pattern 5 times (2 trip detection logic).

  • Short in stop light switch signal circuit

  • Stop light switch

  • ECM

WIRING DIAGRAM

Refer to DTC P0504 (Click here).

CAUTION / NOTICE / HINT

Note:

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

Tip:

  • Using the GTS's Data List allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to save time.

  • Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE

  1. READ VALUE USING GTS (STOP LIGHT SWITCH)

    1. Connect the GTS to the DLC3.

    2. Turn the ignition switch to ON.

    3. Turn the GTS on.

    4. Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch.

    5. Read the value displayed on the GTS when the brake pedal is depressed and released.

      OK

      Brake Pedal

      Display

      Released

      OFF

      Depressed

      ON

    CHECK FOR INTERMITTENT PROBLEMS

    (Click here)

  2. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

    1. Check the stop light switch assembly installation (Click here).

      OK

      Stop light switch assembly is installed correctly.

    SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY

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

    1. Disconnect the stop light switch assembly connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance (Check for Open)

      Tester Connection

      Condition

      Specified Condition

      A55-3 (L) - A76-9 (STP)

      Always

      Below 1 Ω

      A55-5 (L) - A76-10 (ST1-)

      Always

      Below 1 Ω

      Standard Resistance (Check for Short)

      Tester Connection

      Condition

      Specified Condition

      A55-3 (L) or A76-9 (STP) - Body ground

      Always

      10 kΩ or higher

      A55-5 (L) or A76-10 (ST1-) - Body ground

      Always

      10 kΩ or higher

    4. Reconnect the stop light switch assembly connector.

    5. Reconnect the ECM connector.

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

  4. INSPECT STOP LIGHT SWITCH ASSEMBLY

    1. Inspect the stop light switch assembly (Click here).

    REPLACE ECM

    (Click here)

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    (Click here)