AUTOMATIC TRANSMISSION SYSTEM(for 1KD-FTV), 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 while driving in lock-up when the brakes are suddenly applied.

When the brake pedal is depressed, this switch sends a signal to the TCM. Then the TCM cancels the operation of the lock-up clutch while braking is in progress.

DTC Code DTC Detection Condition Trouble Area
P0724 Stop light switch remains on even when the vehicle is driven in a stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) pattern 5 times (2-trip detection logic).

  • Short in stop light switch signal circuit

  • Stop light switch

  • TCM

MONITOR DESCRIPTION

This DTC indicates that the stop light switch remains on. When the stop light switch remains on during stop and go driving, the TCM interprets this as a fault in the stop light switch. Then the MIL illuminates and the TCM stores the DTC. The vehicle must stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) 5 times for 2 driving cycles in order for the DTC to be stored.

WIRING DIAGRAM

B001CH0E06
*a STOP
*b Stop Light Switch
*c Battery

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. Turn the intelligent tester on.

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

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

      Tester Display Measurement Item/Range Normal Condition
      Stop Light Switch

      Stop light switch status/

      ON or OFF

      • ON: Brake pedal depressed

      • OFF: Brake pedal released

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

    NG

  2. CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION


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

      OK
      Stop light switch is installed correctly.

    NG

    SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. Disconnect the A85 stop light switch connector.

    2. Disconnect the G70 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A85-2 (L) - G70-14 (STP) Always Below 1 Ω
      A85-2 (L) - Body ground Always 10 kΩ or higher
      G70-14 (STP) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK STOP LIGHT SWITCH ASSEMBLY


    1. Check the stop light switch assembly Click here.


    OK

    REPLACE TCM Click here

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here