AUTOMATIC TRANSMISSION SYSTEM, 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 the brakes are suddenly applied while driving in the lock-up condition.

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

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0724 Brake Switch "B" Circuit High

All of the following conditions are met (2-trip detection logic)


  • Engine switch is on (IG)

  • The battery voltage is 8 V or more

  • The stop light switch remains on

  • The vehicle is driven in GO ((30 km/h (18.63 mph) or more) and STOP (less than 3 km/h (1.86 mph)) pattern 5 times

  • Stop light switch assembly

  • Short in stop light switch signal circuit

  • TCM

 Comes on DTC stored

MONITOR DESCRIPTION

This DTC indicates that the stop light switch is remaining on. When the stop light switch remains on during GO and STOP driving, the TCM interprets this as a malfunction of the stop light switch, then illuminates the MIL and stores the DTC. The vehicle must GO (30 km/h (18.63 mph) or more) and STOP (less than 3 km/h (1.86 mph)) 5 times for 2 driving cycles in order for the DTC to be output.

WIRING DIAGRAM

B002E0UE02

CAUTION / NOTICE / HINT

Note


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

  • Perform registration and/or initialization when parts related to the automatic transmission are replaced.

    Click here

Tech Tips

After the repair, clear the DTCs and perform the following procedure to check that DTCs are not output.


  1. Repeat above procedure for 5 times:


    • Stop the vehicle (vehicle speed is 3 km/h (1.86 mph) or less)

    • Drive the vehicle (vehicle speed is 30 km/h (18.64 mph) or more)

  2. Turn the engine switch off.

  3. Perform step (1) again.

  4. Check for DTCs again.

    Click here


  1. DATA LIST

    Note

    In the table below, the values listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.

    Tech Tips

    Using the GTS to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.


    1. Warm up the engine.

    2. Turn the engine switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the engine switch on (IG).

    5. Turn the GTS on.

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

    7. Read the Data List according to the display on the GTS.


      Powertrain > ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Switch Stop light switch status ON or OFF

      Brake pedal is


      • ON: Depressed

      • OFF: Released

      		 -

      Powertrain > ECT > Data List
      Tester Display
      Stop Light Switch

PROCEDURE


  1. READ VALUE USING GTS


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

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

    6. Read the Data List according to the display on the GTS.


      Powertrain > ECT > Data List
      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Stop Light Switch Stop light switch status ON or OFF

      Brake pedal is


      • ON: Depressed

      • OFF: Released

      		 -

      Powertrain > ECT > Data List
      Tester Display
      Stop Light Switch
      Result
      Result Proceed to
      Data List value is normal A
      Data List value is not normal B

    A

    SYMPTOM SIMULATION AND DTC CHECK Click here

    B

  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.
      Result
      Proceed to
      OK
      NG

    NG

    SETTING CORRECTLY Click here

    OK

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


    1. Disconnect the A3 stop light switch assembly connector.

    2. Disconnect the A28 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A3-2 (L) - A28-23 (STP) Always Below 1 Ω
      A3-2 (L) or A28-23 (STP) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

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

    OK

  4. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  5. REPLACE TCM


    1. Replace the TCM.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    PERFORM A/T CODE REGISTRATION Click here