Dtc P0724 Brake Switch B Circuit High

Двигатель. Toyota Rav4. Aca30, 33, 38 Ala30
Система Управления Двигателем 2Az-Fe. Toyota Rav4. Aca30, 33, 38 Ala30

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH)

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH - ECM)

DTC P0724 Brake Switch "B" Circuit High


DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling when brakes are suddenly applied while driving in lock-up condition. When the brake pedal is depressed, this switch sends a signals 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 repeats 5 cycles of STOP (less than 1.86 mph [3 km/h]) and GO (18.65 mph [30 km/h] or more)
(2 trip detection logic)
  1. Short in stop light switch signal circuit
  2. Stop light switch
  3. ECM

WIRING DIAGRAM


Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0724 Brake Switch B Circuit High


INSPECTION PROCEDURE

УКАЗАНИЕ:
Read freeze frame data using the intelligent tester. 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, if the air-fuel ratio was lean or rich, and other data from the time the malfunction occurred.
1.READ VALUE OF INTELLIGENT TESTER (STOP LIGHT SWITCH)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on (IG) and turn the tester ON.

  1. Select the following menu items: Powertrain / Engine and ECT / Data List / Stop Light Switch.

  1. Read the values displayed on the tester.


OK:

Item
Measurement Item / Range (display)
Normal Condition
Stop Light Switch
Stop light switch status:
ON or OFF
  1. ON: Brake Pedal is depressed
  2. OFF: Brake Pedal is released


OK
CHECK FOR INTERMITTENT PROBLEMS
NG


2.INSPECT STOP LIGHT SWITCH ASSEMBLY
Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0724 Brake Switch B Circuit High

  1. Remove the stop light switch assembly.

  1. Measure the resistance.

    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 assembly.



NG
REPLACE STOP LIGHT SWITCH ASSEMBLY
OK


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


    Toyota Rav4. Aca30, 33, 38 Ala30.Система Управления Двигателем 2Az-Fe.Система Sfi. Dtc P0724 Brake Switch B Circuit High

  1. Disconnect the A12 ECM connector.

  1. Disconnect the A5 stop light switch connector.

  1. Measure the resistance between the wire harness side connectors.

    Standard resistance (Check for open):
    Tester Connection
    		Specified Condition
    STP (A12-36) - Stop light switch (A5-1)
    		Below 1 Ω
    ST1- (A12-35) - Stop light switch (A5-4)
    Standard resistance (Check for short):
    Tester Connection
    		Specified Condition
    STP (A12-36) or Stop light switch (A5-1) - Body ground
    		10 kΩ or higher
    ST1- (A12-35) or Stop light switch (A5-4) - Body ground

  1. Reconnect the ECM connector.

  1. Reconnect the stop light switch connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM