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

A00O8MQE14

INSPECTION PROCEDURE


  1. DATA LIST

    Tech Tips

    Using the intelligent tester 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 intelligent tester to the DLC3.

    4. Turn the ignition switch to ON.

    5. Turn the intelligent tester on.

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

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

    ECT
    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

    		 -

PROCEDURE


  1. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. A00O3JDE08
      Text in Illustration
      *1 Pin
      *a

      Component without harness connected

      (Stop Light Switch)
      *b Not pushed
      *c Pushed

      Remove the A5 stop light switch.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2

      Pin pushed

      (pedal released)

      		 10 kΩ or higher
      3 - 4

      Pin not pushed

      (pedal depressed)

      		 10 kΩ or higher
      1 - 2

      Pin not pushed

      (pedal depressed)

      		 Below 1 Ω
      3 - 4

      Pin pushed

      (pedal released)

      		 Below 1 Ω

    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (TCM - BATTERY)


    1. A00O9PUE03
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to TCM)

      Disconnect the G70 TCM connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G70-14 (STP) - Body ground Brake pedal depressed 11 to 14 V
      G70-14 (STP) - Body ground Brake pedal released Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM Click here