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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 while driving in lock-up condition when brakes are suddenly applied.

When the brake pedal is depressed, this switch sends a signals to the ECM. Then the ECM 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 (2 mph) and GO (30 km/h (19 mph) or more) fashion 5 times. (2-trip detection logic).

  • Short in stop light switch circuit

  • Stop light switch

  • ECM
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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 ECM interprets this as a fault in the stop light switch and 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) 5 times for two driving cycles in order to detect a malfunction.

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WIRING DIAGRAM

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INSPECTION PROCEDURE

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PROCEDURE


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    READ VALUE USING DATA LIST

    Tip:

    Using 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.


    1. Warm up the engine.

    2. Turn the ignition switch off.

    3. Connect Intelligent tester to the DLC3.

    4. Turn the ignition switch on (IG).

    5. Turn on the tester.

    6. Select the item "Powertrain / Engine and ECT / Data List".

    7. According to the display on the tester, 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 depressed: ON

      Brake Pedal is released: OFF

      		 -
      Note:

      In the table below, the value listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether apart is faulty or not.

      Result
      Result Proceed to
      NG A
      OK B

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    INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. A017FNPE01

      Remove the stop light switch assembly.

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

      Standard resistance
      Tester Connection Switch position Specified Condition
      1 - 2 Switch pin free Below 1 Ω
      ↑ Switch pin pushed in 10 kΩ or higher
      3 - 4 Switch pin free 10 kΩ or higher
      ↑ Switch pin pushed in Below 1 Ω

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    CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)


    1. A017EJ0E02

      Install the stop light switch assembly.

    2. 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
      D31-15 (STP) - Body ground Brake pedal is depressed 11 to 14 V
      Brake pedal is released Below 1 V

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    REPLACE ECM (for 2GR-FE)Click here

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    REPLACE STOP LIGHT SWITCH ASSEMBLYClick here

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    REPAIR OR REPLACE HARNESS OR CONNECTOR