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 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

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.

WIRING DIAGRAM

Click here

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING 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.


    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 on the Intelligent tester.

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

    7. According to the display on the tester, read the "Data List".

      Engine and ECT
      Tester Display Measurement Item/Range (display) 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

    B

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

    A

  2. INSPECT STOP LIGHT SWITCH ASSEMBLY


    1. Inspect the stop light switch assembly Click here.


    NG

    REPLACE STOP LIGHT SWITCH ASSEMBLY Click here

    OK

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


    1. A01EV7SE69
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Install the stop light switch assembly.

    2. Disconnect the ECM connector.

    3. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.

      Standard Voltage
      Condition Tester Connection Specified Condition
      A74-36 (STP) - Body ground Brake pedal is depressed 11 to 14 V
      Brake pedal is released Below 1 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here