Dtc P0724 Brake Switch B Circuit High

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
3Ur-Fe Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STOP LIGHT SWITCH

CHECK HARNESS AND CONNECTOR (ECM - BATTERY)

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 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
Stop light switch remains ON even when vehicle is driven in 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. Short in stop light switch signal circuit
  2. Stop light switch
  3. ECM

MONITOR DESCRIPTION

This DTC indicates that the stop light switch remains ON. When the stop light switch remains ON during GO and STOP driving, the ECM interprets this as a fault in the stop light switch. Then the MIL illuminates and the ECM stores the DTC. The vehicle must GO (30 km/h (18.63 mph) or more) and STOP (less than 3 km/h (1.86 mph)) 5 times for 2 driving cycles in order for the DTC to be output.

WIRING DIAGRAM

Refer to DTC P0504 (Click here).

INSPECTION PROCEDURE

HINT:
Using the GTS to read the Data List allows switch, sensor, actuator and other item values to be read without removing any parts. Reading the Data List early in troubleshooting is one way to save 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 engine switch off.
  3. Connect the GTS to the DLC3.
  4. Turn the engine switch to ON.
  5. Turn the GTS on.
  6. Enter the following menus: Powertrain / Engine and ECT / Data List.
  7. Follow the instructions on the GTS and read the Data List.

Item
Measurement Item/
Range (Display)
Normal Condition
Diagnostic Note
STOP LIGHT SW
(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
Land Cruiser. Urj200, 202 Grj200 Vdj200.3Ur-Fe Engine Control.Sfi System. Dtc P0724 Brake Switch B Circuit High

  1. Remove the stop light switch.

  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
    Pin pushed
    		10 kΩ or higher
    3 - 4
    		Pin not pushed
    		10 kΩ or higher
    Pin pushed
    		Below 1 Ω


NG
REPLACE STOP LIGHT SWITCH (Click here)
OK


2.CHECK HARNESS AND CONNECTOR (ECM - BATTERY)


    Land Cruiser. Urj200, 202 Grj200 Vdj200.3Ur-Fe Engine Control.Sfi System. Dtc P0724 Brake Switch B Circuit High

  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
    A38-36 (STP) - Body ground
    		Brake pedal is depressed
    		11 to 14 V
    A38-36 (STP) - Body ground
    		Brake pedal is released
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)