Dtc P0724 Brake Switch B Circuit High

Land Cruiser URJ200 URJ202 GRJ200 VDJ200 - 1VD-FTV ENGINE CONTROL

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING GTS (STOP LIGHT SWITCH)

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK ECM (STP VOLTAGE)

REPLACE ECM

REPLACE STOP LIGHT SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

DTC P0724 Brake Switch "B" Circuit High

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.

P0724
DTC Detection Drive PatternDTC Detection ConditionTrouble Area
Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less 5 times.Stop light switch remains on even when vehicle is driven in GO (30 km/h (19 mph) or more) and STOP (less than 3 km/h (1.8 mph)) pattern 5 times.
(2 trip detection logic)
Short in stop light switch signal circuit
Stop light switch assembly
ECM
Related Data List
DTC No.Data List
P0724Stop Light Switch

WIRING DIAGRAM

Refer to DTC P0504 ().


INSPECTION PROCEDURE

  • NOTICE:
Inspect the fuses of circuits related to this system before performing the following inspection procedure.
After replacing the ECM, the new ECM needs registration () and initialization ().
After replacing the fuel supply pump assembly, the ECM needs initialization ().
After replacing an injector assembly, the ECM needs registration ().
  • HINT:
  • Read freeze frame data using the GTS. 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, and other data from the time the malfunction occurred.
1.READ VALUE USING GTS (STOP LIGHT SWITCH)

Connect the GTS to the DLC3.

Turn the engine switch on (IG).

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

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

  • OK:
  • Brake PedalDisplay
    ReleasedOFF
    DepressedON
OK
Go to step 7
NG
Go to step 2
2.INSPECT STOP LIGHT SWITCH ASSEMBLY

Inspect the stop light switch assembly ().

NG
Go to step 5
OK
3.CHECK ECM (STP VOLTAGE)
Dtc P0724 Brake Switch B Circuit High. 1VD-FTV ENGINE CONTROL. Land Cruiser URJ200 URJ202 GRJ200 VDJ200

Disconnect the ECM connector.

Turn the engine switch on (IG).

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

  • Standard Voltage:
  • for LHD
    Tester ConnectionBrake Pedal ConditionSpecified Condition
    A38-13 (STP) - Body groundReleased0 to 3 V
    Depressed11 to 14 V
  • Standard Voltage:
  • for RHD
    Tester ConnectionBrake Pedal ConditionSpecified Condition
    A52-13 (STP) - Body groundReleased0 to 3 V
    Depressed11 to 14 V
Text in Illustration
*Afor LHD
*Bfor RHD
*aBrake Pedal Depressed
*bBrake Pedal Released
*cComponent with harness connected
(ECM)
NG
Go to step 6
OK
4.REPLACE ECM

Replace the ECM ().

NEXT
Go to step 7
5.REPLACE STOP LIGHT SWITCH ASSEMBLY

Replace the stop light switch assembly ().

NEXT
Go to step 7
6.REPAIR OR REPLACE HARNESS OR CONNECTOR

Repair or replace the harness or connector.

NEXT
7.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED

Connect the GTS to the DLC3.

Clear the DTCs ().

Turn the engine switch off for 30 seconds or more.

Turn the engine switch on (IG) and turn the GTS on.

Start the engine.

Accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less 5 times or more.

Confirm that the DTC is not output again.

  • HINT:
  • Perform the following procedure using the GTS to determine whether or not the DTC judgment has been carried out.

Enter the following menus: Engine and ECT / Utility / All Readiness.

Input DTC P0724.

Check that STATUS is NORMAL.

  • HINT:
If STATUS is NORMAL, DTC judgment is complete and it can be determined that the system is normal.
If STATUS is INCOMPLETE or N/A, DTC judgment is incomplete. Perform the following procedure again 5 times: accelerate the vehicle to 30 km/h (19 mph) or more, depress the brake pedal and decelerate the vehicle to 3 km/h (1.8 mph) or less.
NEXT
END