AUTOMATIC TRANSMISSION SYSTEM(for 1VD-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 the lock-up condition when the brakes are suddenly applied.

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

DTC Code 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) pattern 5 times (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, the MIL comes on and the ECM 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 2 driving cycles in order to detect a malfunction.

WIRING DIAGRAM

A01X6VUE11

CAUTION / NOTICE / HINT


  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

      Brake pedal:


      • Depressed: ON

      • Released: OFF

      		 -

PROCEDURE


  1. INSPECT STOP LIGHT SWITCH


    1. A01X8Y1E01
      *a Component without harness connected: (Stop Light Switch)
      *b Pin
      *c Not Pushed
      *d Pushed

      Remove the stop light switch Click here.

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

      Standard Resistance
      Tester Connection Switch 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

    NG

    REPLACE STOP LIGHT SWITCH Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (BATTERY - ECM)


    1. A01X661E01

      Disconnect the ECM connector.

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

      Standard Voltage
      for LHD
      Tester Connection Condition Specified Condition
      A38-36 (STP) - Body ground Brake pedal depressed 11 to 14 V
      A38-36 (STP) - Body ground Brake pedal released Below 1 V
      for RHD
      Tester Connection Condition Specified Condition
      A52-36 (STP) - Body ground Brake pedal depressed 11 to 14 V
      A52-36 (STP) - Body ground Brake pedal released Below 1 V

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR