AUTOMATIC TRANSAXLE 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. Then the TCM 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 is driven in a STOP (less than 3 km/h (2 mph)) and GO (30 km/h (19 mph) or more) fashion 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, illuminates the MIL, and stores the DTC. The vehicle must stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) five times for two consecutive driving cycles in order to set this DTC.

WIRING DIAGRAM

A01EJADE12

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING DATA LIST (STP SIGNAL)

    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.

    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.


    1. Turn the ignition switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the ignition switch to ON.

    4. Turn the GTS on.

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

    6. According to the display on the GTS, read the Data List.

      Standard
      Item Measurement Item/Range Normal Condition
      Stop Light Switch

      Stop light switch status/

      ON or OFF

      • Brake pedal is depressed: ON

      • Brake pedal is released: OFF

      Note

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


    NG

    CHECK STOP LAMP SWITCH ASSEMBLY INSTALLATION Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS Click here

  2. CHECK STOP LAMP SWITCH ASSEMBLY INSTALLATION


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

      OK
      Stop light switch assembly is installed correctly.

    NG

    SECURELY REINSTALL STOP LAMP SWITCH ASSEMBLY

    OK

  3. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Remove the stop light switch assembly Click here.


    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. A01ELIEE21
      Text in Illustration
      *1

      Front view of wire harness connector

      (to TCM)

      Install the stop light switch assembly.

    2. Connect the stop light switch connector.

    3. Disconnect the TCM connector.

    4. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.

      Standard Voltage
      Tester Connection Condition Specified Condition
      B40-12 (STP) - Body ground Brake pedal is depressed 7.5 to 14 V
      B40-12 (STP) - Body ground Brake pedal is released Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM Click here