Dtc P0724 Brake Switch B Circuit High

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
1Gr-Fe Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (ECM - BATTERY)

DTC P0724 Brake Switch "B" Circuit High


DESCRIPTION

The stop light switch is part of a duplex system that transmits 2 signals: STP and ST1-. These 2 signals are used by the ECM to monitor whether or not the brake system is working properly.
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.

DTC No.
DTC Detection Condition
Trouble Area
P0724
Stop light switch remains on even when the vehicle is driven in a GO (30 km/h (18.65 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 assembly
  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 (18.65 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 stored.

WIRING DIAGRAM

Refer to DTC P0504 (Click here).

INSPECTION PROCEDURE

HINT:
Using the GTS 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 GTS to the DLC3.
  4. Turn the ignition switch to ON.
  5. Turn the GTS on.
  6. Enter the following menus: Powertrain / Engine and ECT / Data List.
  7. According to the display on the GTS, read the Data List.

GTS Display
Measurement Item/Range
Normal Condition
Diagnostic Note
Stop Light Switch
Stop light switch status/ON or OFF
  1. Brake pedal depressed: ON
  2. Brake pedal released: OFF
-
1.INSPECT STOP LIGHT SWITCH ASSEMBLY

  1. Inspect the stop light switch assembly (Click here).



NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (Click here)
OK


2.CHECK HARNESS AND CONNECTOR (ECM - BATTERY)
Land Cruiser. Urj200, 202 Grj200 Vdj200.1Gr-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:
    for LHD
    Tester Connection
    		Condition
    		Specified Condition
    A38-36 (STP) - Body ground
    		Brake pedal depressed
    		7.5 to 14 V
    A38-36 (STP) - Body ground
    		Brake pedal released
    		Below 1.5 V
    for RHD
    Tester Connection
    		Condition
    		Specified Condition
    A52-36 (STP) - Body ground
    		Brake pedal depressed
    		7.5 to 14 V
    A52-36 (STP) - Body ground
    		Brake pedal released
    		Below 1.5 V
    Text in Illustration
    *A
    		for LHD
    *B
    		for RHD
    *a
    		Brake Pedal Depressed
    *b
    		Brake Pedal Released
    *c
    		Front view of wire harness connector
    (to ECM)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (Click here)