Dtc P0724 Brake Switch B Circuit High

Drivetrain. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
A340F Automatic Transmission Transaxle. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (BATTERY - TCM)

DTC 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 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
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).
  1. Short in stop light switch signal circuit
  2. Stop light switch
  3. 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. Then the MIL illuminates and the TCM 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 2 driving cycles in order for the DTC to be stored.

WIRING DIAGRAM


Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.A340F Automatic Transmission Transaxle.Automatic Transmission System. Dtc P0724 Brake Switch B Circuit High


INSPECTION PROCEDURE


DATA LIST
HINT:
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.
NOTICE:
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 intelligent 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
    1. Brake pedal is depressed: ON
    2. Brake pedal is released: OFF
    		-
1.INSPECT STOP LIGHT SWITCH ASSEMBLY


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.A340F Automatic Transmission Transaxle.Automatic Transmission System. Dtc P0724 Brake Switch B Circuit High

  1. Remove the stop light switch assembly (HILUX_TGN26 RM0000018VF00UX.html).

  1. 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
    Text in Illustration
    *1
    		Pin
    *a
    		Component without harness connected
    (Stop Light Switch Assembly)
    *b
    		Not pushed
    *c
    		Pushed


NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (HILUX_TGN26 RM0000018VF00UX.html)
OK


2.CHECK HARNESS AND CONNECTOR (BATTERY - TCM)


    Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.A340F Automatic Transmission Transaxle.Automatic Transmission System. Dtc P0724 Brake Switch B Circuit High

  1. Disconnect the G41 TCM connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G41-14 (STP) - Body ground
    		Brake pedal depressed
    		7.5 to 14 V
    G41-14 (STP) - Body ground
    		Brake pedal released
    		Below 1 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to TCM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE TCM (HILUX_TGN26 RM000004ROZ00CX.html)