ECD SYSTEM (w/ EGR Cooler Bypass Valve), Diagnostic DTC:P0724

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

DESCRIPTION

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

DTC No. DTC Detection Condition Trouble Area
P0724

Stop light switch assembly 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

WIRING DIAGRAM

A01KGBPE01

INSPECTION PROCEDURE

Note

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

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 running or stopped, 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 ignition switch to ON.

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

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

      OK
      Brake Pedal Display
      Released off
      Depressed on

    OK

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

    NG

    INSPECT STOP LIGHT SWITCH ASSEMBLY (STOP LIGHT SWITCH ASSEMBLY) Click here

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY (STOP LIGHT SWITCH ASSEMBLY)

    A01KG6EE03
    Text in Illustration
    *a Free
    *b Pushed in

    1. Remove the stop light switch assembly.

    2. Measure the resistance of the stop light switch assembly according to the values in the table below.

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Switch pin not pushed Below 1 Ω
      Switch pin pushed 10 kΩ or higher
      3 - 4 Switch pin not pushed 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 ECM (STP VOLTAGE)

    A01KGCQE25
    Text in Illustration
    *1 ECM Connector
    *a Brake Pedal Depressed
    *b Brake Pedal Released

    1. Disconnect the E17 ECM connector.

    2. Turn the ignition switch to ON.

    3. Measure the voltage according to the values in the table below.

      Standard Voltage
      Tester Connection Brake Pedal Condition Specified Condition
      E17-8 (STP) - Body ground Released 0 to 1 V
      Depressed 11 to 14 V

    4. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR Click here

    OK

  4. REPLACE ECM


    1. Replace the ECM Click here.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  5. REPLACE STOP LIGHT SWITCH ASSEMBLY


    1. Replace the stop light switch assembly.


    NEXT

    CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED Click here

  6. REPAIR OR REPLACE HARNESS OR CONNECTOR


    1. Repair or replace the harness or connector.


    NEXT

  7. CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED


    1. Connect the intelligent tester to the DLC3.

    2. Clear 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.

      Tech Tips

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


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

      2. Input DTC P0724.

      3. Check that STATUS is NORMAL.

        Tech Tips


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

        • If STATUS is INCOMPLETE or UNKNOWN, 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.


    NEXT

    END