Dtc P0724 Brake Switch B Circuit High

Engine. Camry. Acv40 Gsv40
2Az-Fe Engine Control System. Camry. Acv40 Gsv40

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STOP LIGHT SWITCH

CHECK WIRE HARNESS (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

WIRING DIAGRAM


Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P0724 Brake Switch B Circuit High


INSPECTION PROCEDURE

HINT:
  1. Using the intelligent tester's 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.
  2. Read freeze frame data using the intelligent tester. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.INSPECT STOP LIGHT SWITCH


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P0724 Brake Switch B Circuit High

  1. Disconnect the A19 stop light switch connector.

  1. Remove the stop light switch.

  1. Measure the resistance between the terminals.

    Standard resistance:
    Tester Connection
    		Switch Position
    		Specified Condition
    1 - 2
    		Switch pin not pushed
    		Below 1 Ω
    Switch pin pushed
    		10 kΩ or higher
    3 - 4
    		Switch pin not pushed
    		10 kΩ or higher
    Switch pin pushed
    		Below 1 Ω

  1. Reinstall the stop light switch.

  1. Reconnect the stop light switch connector.



NG
REPLACE STOP LIGHT SWITCH
OK


2.CHECK WIRE HARNESS (ECM - BATTERY)


    Camry. Acv40 Gsv40.2Az-Fe Engine Control System.Sfi System. Dtc P0724 Brake Switch B Circuit High

  1. Measure the voltage of the wire harness side connector.

    1. Disconnect the A24 ECM connector.

    2. Measure the voltage.

      Standard voltage:
      Tester Connection
      		Condition
      		Specified Condition
      STP (A24-36) - Body ground
      		Brake pedal is depressed
      		9 to 14 V
      STP (A24-36) - Body ground
      		Brake pedal is released
      		Below 1.5 V

    3. Reconnect the ECM connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - ECM)
OK

REPLACE ECM