Dtc P0724 Brake Switch B Circuit High


DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING INTELLIGENT TESTER (STOP LIGHT SWITCH)

CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - TCM)

CHECK 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 lock-up when the brakes are suddenly applied.
When the brake pedal is depressed, this switch sends a signal to the TCM. Then the TCM cancels the operation of the lock-up clutch while braking is in progress.

DTC Code
DTC Detection Condition
Trouble Area
P0724
Stop light switch remains on even when the vehicle is driven in a stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) pattern 5 times (2-trip detection logic).
  1. Short in stop light switch signal circuit
  2. Stop light switch
  3. TCM

MONITOR DESCRIPTION

This DTC indicates that the stop light switch remains on. When the stop light switch remains on during stop and go driving, the TCM interprets this as a fault in the stop light switch. Then the MIL illuminates and the TCM stores the DTC. The vehicle must stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) 5 times for 2 driving cycles in order for the DTC to be stored.

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.A750F Automatic Transmission Transaxle.Automatic Transmission System (For 1Kd-Ftv). Dtc P0724 Brake Switch B Circuit High


INSPECTION PROCEDURE

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 intelligent tester on.

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

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


    Tester Display
    		Measurement Item/Range
    		Normal Condition
    Stop Light Switch
    		Stop light switch status/
    ON or OFF
    1. ON: Brake pedal depressed
    2. OFF: Brake pedal released


NG
Go to step 2
OK

CHECK FOR INTERMITTENT PROBLEMS (LandCruiser RM000003YMJ00XX.html)

2.CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

  1. Check the stop light switch assembly installation (LandCruiser RM000003QJQ01EX.html).

    OK:
    Stop light switch is installed correctly.


NG
SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY (LandCruiser RM000003QJQ01EX.html)
OK


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

  1. Disconnect the A85 stop light switch connector.

  1. Disconnect the G70 TCM connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A85-2 (L) - G70-14 (STP)
    		Always
    		Below 1 Ω
    A85-2 (L) - Body ground
    		Always
    		10 kΩ or higher
    G70-14 (STP) - Body ground
    		Always
    		10 kΩ or higher


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK STOP LIGHT SWITCH ASSEMBLY

  1. Check the stop light switch assembly (LandCruiser RM000003QJR00YX.html).



NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (LandCruiser RM000003QJT01GX.html)
OK

REPLACE TCM (LandCruiser RM0000048F300JX.html)