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ECD SYSTEM, Diagnostic DTC:P0724

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

Table 1. P0724
DTC Detection Drive Pattern DTC Detection Condition Trouble Area
Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less 5 times.

Stop light switch remains on even when vehicle is driven in GO (30 km/h (19 mph) or more) and STOP (less than 3 km/h (1.8 mph)) pattern 5 times.

(2 trip detection logic)

  • Short in stop light switch signal circuit

  • Stop light switch assembly

  • ECM
Table 2. Related Data List
DTC No. Data List
P0724 Stop Light Switch
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WIRING DIAGRAM

Refer to DTC P0504 (Click here).

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INSPECTION PROCEDURE

Note:

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

  • After replacing the ECM, the new ECM needs registration (Click here) and initialization (Click here).

Tip:

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.

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PROCEDURE


  1. Click here

    READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)


    1. Connect the intelligent tester to the DLC3.

    2. Turn the ignition switch to ON.

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

    4. Read the value displayed on the tester when the brake pedal is depressed and released.

      OK
      Brake Pedal Display
      Released OFF
      Depressed ON

  2. Click here

    CHECK STOP LIGHT SWITCH ASSEMBLY (INSTALLATION)


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


  3. Click here

    CHECK ECM (STP VOLTAGE)


    1. Disconnect the ECM connector.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Brake Pedal Condition Specified Condition
      A51-35 (STP) - Body ground Released 0 to 3 V
      Depressed 11 to 14 V
      Table 3. Text in Illustration
      *a Brake Pedal Depressed
      *b Brake Pedal Released
      *c

      Front view of wire harness connector

      (to ECM)

    4. Reconnect the ECM connector.


  4. Click here

    CHECK STOP LIGHT SWITCH ASSEMBLY (TERMINAL B VOLTAGE)


    1. A01IQTJE02

      Disconnect the stop light switch connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A55-7 (B) - Body ground Always 11 to 14 V
      A55-6 (B) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A55-2 (GND) - Body ground Always Below 1 Ω
      Table 4. Text in Illustration
      *a

      Front view of wire harness connector

      (to Stop Light Switch Assembly)

    4. Reconnect the stop light switch connector.


  5. Click here

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


    1. Disconnect the stop light switch connector.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A55-5 (L) - A51-34 (ST1-) Always Below 1 Ω
      A55-3 (L) - A51-35 (STP) Always Below 1 Ω
      A55-5 (L) or A51-34 (ST1-) - Body ground Always 10 kΩ or higher
      A55-3 (L) or A51-35 (STP) - Body ground Always 10 kΩ or higher

    4. Reconnect the stop light switch connector.

    5. Reconnect the ECM connector.


  6. Click here

    REPLACE STOP LIGHT SWITCH ASSEMBLY


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


  7. Click here

    REPLACE ECM


    1. Replace the ECM (Click here).


  8. Click here

    SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY


    1. Securely reinstall the stop light switch assembly (Click here).


  9. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


  10. Click here

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear the DTCs (Click here).

    3. Turn the ignition switch off for 30 seconds or more.

    4. Turn the ignition switch to ON and turn the tester on.

    5. Start the engine.

    6. Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less 5 times or more.

    7. Confirm that the DTC is not output again.

      Tip:

      Perform the following procedure using the tester to determine whether or not the DTC judgment has been carried out.


      1. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

      2. Input DTC P0724.

      3. Check that STATUS is NORMAL.

        Tip:

        • If STATUS is NORMAL, DTC judgment is complete and the system is determined to be normal.

        • If STATUS is INCOMPLETE or N/A, DTC judgment is incomplete. Perform the following procedure again 5 times: accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less.


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    END