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AUTOMATIC TRANSAXLE SYSTEM, Diagnostic DTC:P0724

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DTC Code DTC Name
P0724 Brake Switch "B" Circuit High
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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 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

  • TCM
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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.

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WIRING DIAGRAM

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INSPECTION PROCEDURE


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  1. DATA LIST

    Tip:

    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.

      Table 1. 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

      		 -
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PROCEDURE


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    INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. A01ITF5E07

      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 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

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    CHECK HARNESS AND CONNECTOR (BATTERY - TCM)


    1. A01IUNZE18

      Disconnect the TCM connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      C29-12 (STP) - Body ground Brake pedal depressed 7.5 to 14 V
      C29-12 (STP) - Body ground Brake pedal released Below 1 V
      Table 2. Text in Illustration
      *a

      Front view of wire harness connector

      (to TCM)

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    REPLACE TCMClick here

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    REPLACE STOP LIGHT SWITCH ASSEMBLYClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR