Dtc P0724 Brake Switch B Circuit High

Transmission. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35
U241E Automatic Transaxle. Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35

DESCRIPTION

MONITOR DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT STOP LIGHT SWITCH

CHECK WIRE HARNESS (ECM - STOP LIGHT SWITCH)

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

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 output.

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0724 Brake Switch B Circuit High


INSPECTION PROCEDURE

HINT:
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.
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 intelligent tester to the DLC3.
  4. Turn the ignition switch on (IG) and turn the tester ON.
  5. Enter the following menus: Powertrain / Engine and ECT / Data List.
  6. Follow the instructions on the tester and read the Data List.

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


    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0724 Brake Switch B Circuit High

  1. Remove the A66 stop light switch.

  1. Measure the resistance of the switch.

    Standard resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    1 - 2
    		Pin pushed
    (pedal released)
    		10 kΩ or higher
    1 - 2
    		Pin not pushed
    (pedal depressed)
    		Below 1 Ω
    3 - 4
    		Pin pushed
    (pedal released)
    		Below 1 Ω
    3 - 4
    		Pin not pushed
    (pedal depressed)
    		10 kΩ or higher


NG
REPLACE STOP LIGHT SWITCH
OK


2.CHECK WIRE HARNESS (ECM - STOP LIGHT SWITCH)

  1. Install the A66 stop light switch.



    Toyota Rav4. Aca30, 33, 38 Gsa33 Zsa30, 35.U241E Automatic Transaxle.Automatic Transaxle System. Dtc P0724 Brake Switch B Circuit High

  1. Disconnect the A12 ECM connector.

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

    Standard voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A12-36 (STP) - Body ground
    		Brake pedal is depressed
    		10 to 14 V
    A12-36 (STP) - Body ground
    		Brake pedal is released
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS AND CONNECTOR
OK

REPLACE ECM