Dtc P0724 Brake Switch B Circuit High

Engine Hybrid System. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25
2Tr-Fbe Engine Control. Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

INSPECT STOP LIGHT SWITCH ASSEMBLY

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

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, the stop light switch sends a signal 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 GO (30 km/h (18.63 mph) or more) and STOP (less than 3 km/h (1.86 mph)) pattern 5 times (2 trip detection logic).
  1. Stop light switch assembly signal circuit
  2. Stop light switch assembly
  3. ECM

WIRING DIAGRAM

Refer to DTC P0504 (HILUX_TGN26 RM000000XCT0MPX_02.html).

INSPECTION PROCEDURE

HINT:
  1. 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. Reading the Data List information early in troubleshooting is one way to save diagnostic time.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / Data List / Stop Light Switch.

  1. Read the value displayed on the tester when the brake pedal is depressed and released.

    OK:
    Brake Pedal
    		Display
    Released
    		OFF
    Depressed
    		ON


NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (HILUX_TGN26 RM000000PDQ0Q4X.html)

2.INSPECT STOP LIGHT SWITCH ASSEMBLY
Hilux. Tgn26, 36 Kun25, 26, 35, 36 Ggn25.2Tr-Fbe Engine Control.Sfi System. Dtc P0724 Brake Switch B Circuit High

  1. Inspect the stop light switch assembly.

    1. Measure the voltage 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 not pushed
      		10 kΩ or higher
      1 - 2
      		Pin pushed
      		10 kΩ or higher
      3 - 4
      		Pin pushed
      		Below 1 Ω


NG
REPLACE STOP LIGHT SWITCH ASSEMBLY
OK


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

  1. Disconnect the ECM connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G146-18 (STP) - Body ground
    		Brake pedal depressed
    		11 to 14 V
    G146-18 (STP) - Body ground
    		Brake pedal released
    		Below 1.5 V

  1. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - STOP LIGHT SWITCH ASSEMBLY)
OK

REPLACE ECM (HILUX_TGN26 RM000000VW2024X.html)