СИСТЕМА АВТОМАТИЧЕСКОЙ ТРАНСМИССИИ, 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 the lock-up condition when the brakes are suddenly applied.

When the brake pedal is depressed, this switch sends signals to the ECM. Then the ECM cancels the operation of the lock-up clutch during braking.

DTC Code DTC Detection Condition Trouble Area
P0724 Stop light switch remains on while the vehicle is running (2 trip detection logic).

  • Short in stop light switch signal circuit

  • Stop light switch

  • ECM

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 ECM interprets this as a fault in the stop light switch. Then the MIL illuminates and the ECM stores the DTC.

WIRING DIAGRAM

A01DWCME17

INSPECTION PROCEDURE

Tech Tips

Using the Data List of the intelligent tester allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to save time.


  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 and push the tester main switch on.

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

  6. Follow the instructions on the tester and read the 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

 -

Note

In the table above, 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.

PROCEDURE


  1. INSPECT STOP LIGHT SWITCH


    1. A01DYP3E02

      Remove the S14 stop light switch.

    2. Measure the resistance of the switch.

      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

    OK

  2. CHECK WIRE HARNESS (ECM - BATTERY)


    1. A01E2IFE03

      Measure the voltage of the wire harness side connector.

      Standard Voltage
      Tester Connection Condition Specified Condition
      E10-4 (STP) - Body ground Brake pedal is depressed 11 to 14 V
      E10-4 (STP) - Body ground Brake pedal is released Below 1 V

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

    REPLACE ECM