Dtc P0724 Brake Switch B Circuit High

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1UR-FE ENGINE CONTROL

DESCRIPTION

MONITOR DESCRIPTION

CONFIRMATION DRIVING PATTERN

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

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 ConditionTrouble Area
P0724Stop 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).
Short in stop light switch signal circuit
Stop light switch assembly
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 stored.


CONFIRMATION DRIVING PATTERN

Dtc P0724 Brake Switch B Circuit High. 1UR-FE ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Connect the GTS to the DLC3.
Turn the engine switch on (IG) and turn the GTS on.
Clear DTCs (even if no DTCs are stored, perform the clear DTC operation).
Turn the engine switch off and wait for at least 30 seconds.
Turn the engine switch on (IG) and turn the GTS on [A].
Wait 5 seconds.
Enter the following menus: Powertrain / Engine and ECT / Trouble Codes [B].
Read the pending DTCs.
  • HINT:
If a pending DTC is output, the system is malfunctioning.
If a pending DTC is not output, perform the following procedure.
Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.
Input the DTC: P0724.
Check the DTC judgment result.
GTS DisplayDescription
NORMAL
DTC judgment completed
System normal
ABNORMAL
DTC judgment completed
System abnormal
INCOMPLETE
DTC judgment not completed
Perform driving pattern after confirming DTC enabling conditions
N/A
Unable to perform DTC judgment
Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit
  • HINT:
If the judgment result shows NORMAL, the system is normal.
If the judgment result shows ABNORMAL, the system has a malfunction.
If the judgment result shows INCOMPLETE or N/A, perform steps [C] through [E].
Start the engine [C].
Accelerate the vehicle to 30 km/h (18.63 mph) or more, and then depress the brake pedal and decelerate the vehicle to 3 km/h (1.86 mph) or less [D]. Repeat step [D] 5 times.
  • CAUTION:
  • When performing the confirmation driving pattern, obey all speed limits and traffic laws.
Check the DTC judgment result [E].

WIRING DIAGRAM

Refer to DTC P0504 ().


INSPECTION PROCEDURE

  • HINT:
  • Using the GTS, the Data List item "Stop Light Switch" can be read.
ItemMeasurement Item/
Range (Display)		Normal ConditionDiagnostic Note
Stop Light SwitchStop light switch status/
ON or OFF
Brake pedal depressed: ON
Brake pedal released: OFF
-
1.CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

Check the stop light switch assembly installation.

  • OK:
  • Stop light switch assembly is installed correctly.
NG
SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY ()
OK
2.INSPECT STOP LIGHT SWITCH ASSEMBLY

Inspect the stop light switch assembly ().

NG
REPLACE STOP LIGHT SWITCH ASSEMBLY ()
OK
3.CHECK HARNESS AND CONNECTOR (ECM - BATTERY)

Disconnect the ECM connector.

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

  • Standard Voltage:
  • for RHD
    Tester ConnectionConditionSpecified Condition
    A52-36 (STP) - Body groundBrake pedal is depressed7.5 to 14 V
    A52-36 (STP) - Body groundBrake pedal is releasedBelow 1.5 V
  • for LHD
    Tester ConnectionConditionSpecified Condition
    A38-36 (STP) - Body groundBrake pedal is depressed7.5 to 14 V
    A38-36 (STP) - Body groundBrake pedal is releasedBelow 1.5 V
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE ECM ()