СИСТЕМА SFI, Diagnostic DTC:P0724

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

DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling when brakes are suddenly applied while driving in lock-up condition. When the brake pedal is depressed, the stop light switch sends a signal to the ECM. Then the ECM cancels the operation of the lock-up clutch while braking is in progress.

DTC No. DTC Detection Condition Trouble Area
P0724 The stop light switch remains on even when the vehicle repeats 5 cycles of STOP (less than 3 km/h [1.86 mph]) and GO (30 km/h [18.65 mph] or more) (2 trip detection logic).

  • Short in stop light switch signal circuit

  • Stop light switch

  • ECM

WIRING DIAGRAM

Refer to DTC P0504 Click here.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, and other data from the time the malfunction occurred.

PROCEDURE

  1. READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

    1. Connect the intelligent tester to the DLC3.

    2. Turn the engine switch on (IG) and turn the tester on.

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

    4. Read the values displayed on the tester.

      OK
      Tester Display Measurement Item / Range Normal Condition
      Stop Light Switch

      Stop light switch status:

      ON or OFF

      • ON: Brake pedal is depressed

      • OFF: Brake pedal is released
    NG

    Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY

    A00DQCUE03

    1. Remove the stop light switch assembly.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Switch pin released Below 1 Ω
      Switch pin pushed 10 kΩ or higher
      3 - 4 Switch pin released 10 kΩ or higher
      Switch pin pushed Below 1 Ω

    3. Reinstall the stop light switch assembly.

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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

    1. Disconnect the A40 ECM connector.

      A005RVWE01

    2. Disconnect the A1 stop light switch connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A40-36 (STP) - A1-1 Always Below 1 Ω
      A40-35 (ST1-) - A1-4
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A40-36 (STP) or A1-1 - Body ground Always 10 kΩ or higher
      A40-35 (ST1-) or A1-4 - Body ground
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Stop Light Switch)
      *2

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the ECM connector.

    5. Reconnect the stop light switch connector.

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here