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 (1.86 mph)) and GO (30 km/h (18.65 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 (1.86 mph)) and go (30 km/h (18.65 mph) or more) five times for two consecutive driving cycles in order to set this DTC.

MONITOR STRATEGY

Related DTCs P0724: Stop light switch/Range check/Rationality
Required sensors/Components Stop light switch
Frequency of operation Continuous
Duration GO and STOP 5 times
MIL operation 2 driving cycles
Sequence of operation None

TYPICAL ENABLING CONDITIONS

The stop light switch remains ON during GO and STOP 5 times..

GO and STOP are defined as follows;
The monitor will run whenever this DTC is not present. None
GO: (Vehicle speed is 18.65 mph (30 km/h) or more) 18.65 mph (30 km/h) or more
STOP: (Vehicle speed is less than 1.86 mph (3 km/h)) Less than 1.86 mph (3 km/h)
Starter OFF
Battery voltage 8 V or more
Engine switch on (IG)

TYPICAL MALFUNCTION THRESHOLDS

Brake switch Remains ON

WIRING DIAGRAM

A01I0XZE09

INSPECTION PROCEDURE

Note

Perform the universal trip to clear permanent DTCs Click here.

PROCEDURE


  1. READ VALUE USING DATA LIST (STP SIGNAL)

    Tech Tips

    Using the Techstream 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 engine switch off.

    2. Connect the Techstream to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the Techstream on.

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

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

      OK
      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 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 LIGHT SWITCH ASSEMBLY INSTALLATION Click here

    OK

    CHECK FOR INTERMITTENT PROBLEMS

  2. CHECK STOP LIGHT 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 LIGHT SWITCH ASSEMBLY

    OK

  3. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect 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. A01I23VE66
      Text in Illustration
      *a

      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
      E7-12 (STP) - Body ground Brake pedal is depressed 7.5 to 14 V
      E7-12 (STP) - Body ground Brake pedal is released Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM Click here