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 lock-up.

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.

Detection Item

DTC Detection Condition

Trouble Area

MIL

Memory

P0724

Brake Switch "B" Circuit High

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) pattern 5 times (2-trip detection logic).

  • Short in stop light switch signal circuit

  • Stop light switch

  • TCM

Comes on

DTC stored

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 for this DTC to be stored.

WIRING DIAGRAM

C279415E01

CAUTION / NOTICE / HINT

Note:

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

Click here

  1. DATA LIST

    Tip:

    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. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect the GTS to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the GTS on.

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

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

      Powertrain > ECT > Data List

      Tester Display

      Measurement Item

      Range

      Normal Condition

      Diagnostic Note

      Stop Light Switch

      Stop light switch status

      ON or OFF

      • ON: Brake pedal depressed

      • OFF: Brake pedal released

      -

      Powertrain > ECT > Data List

      Tester Display

      Stop Light Switch

PROCEDURE

  1. INSPECT STOP LIGHT SWITCH ASSEMBLY

    1. C228781C01

      *1

      Stop Light Switch Assembly

      *2

      Pin

      *a

      Not Pushed

      *b

      Pushed

      Remove the stop light switch assembly.

      Click here

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Pin not pushed

      Below 1 Ω

      3 - 4

      Pin pushed

      Below 1 Ω

      1 - 2

      Pin pushed

      10 kΩ or higher

      3 - 4

      Pin not pushed

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY

    Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (BATTERY - TCM)

    1. C205632C11

      *a

      Front view of wire harness connector

      (to TCM)

      Disconnect the TCM connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      B79-12 (STP) - Body ground

      Brake pedal depressed

      7.5 to 14 V

      B79-12 (STP) - Body ground

      Brake pedal released

      Below 1 V

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE TCM

    Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR