Dtc P0724 Brake Switch B Circuit High

Drivetrain. Corolla. Zre142 Aze141
U250E Automatic Transmission Transaxle. Corolla. Zre142 Aze141

DESCRIPTION

MONITOR DESCRIPTION

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

WIRING DIAGRAM

INSPECTION PROCEDURE

READ VALUE USING DATA LIST

INSPECT STOP LIGHT SWITCH ASSEMBLY

CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM)

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 condition when brakes are suddenly applied.
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 Detecting Condition
Trouble Area
P0724
The 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) fashion 5 times. (2-trip detection logic).
  1. Short in stop light switch 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 "stop and go" driving, the ECM interprets this as a fault in the stop light switch and the MIL comes on and the ECM 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 two driving cycles in order to detect a malfunction.

MONITOR STRATEGY


Related DTCs
P0724: Stop light switch/Rationality
Required sensors/Components
Stop light switch, Vehicle speed sensor
Frequency of operation
Continuous
Duration
GO and STOP 5 times
MIL operation
2 driving cycles
Sequence of operation
None

TYPICAL ENABLING CONDITIONS


The monitor will run whenever this DTC is not present.
None
Ignition switch
ON
Starter
OFF
Battery voltage
8 V or more
GO (Vehicle speed is 30 km/h (18.63 mph) or more)
Once
STOP (Vehicle speed is less than 3 km/h (1.86 mph))
Once

TYPICAL MALFUNCTION THRESHOLDS


Brake switch
Remain ON during GO and STOP 5 times

WIRING DIAGRAM

COROLLA_ZRE142 RM000000XCT0SHX_02.html

INSPECTION PROCEDURE

NOTICE:
Perform the universal trip to clear permanent DTCs (COROLLA_ZRE142 RM000000W770S6X.html).
1.READ VALUE USING DATA LIST
HINT:
Using Techstream to read the Data List allows the values or states of switches, sensors, actuators and other items to be read without removing any parts. This non-intrusive inspection can be very useful because intermittent conditions or signals may be discovered before parts or wiring is disturbed. Reading the Data List information early in troubleshooting is one way to save diagnostic time.

  1. Warm up the engine.

  1. Turn the ignition switch off.

  1. Connect Techstream to the DLC3.

  1. Turn the ignition switch to the on position.

  1. Turn on the tester.

  1. Select the item "Powertrain / Engine and ECT / Data List".

  1. According to the display on the tester, read the "Data List".

    Tester Display
    		Measurement Item/Range (display)
    		Normal Condition
    		Diagnostic Note
    Stop Light Switch
    		Stop light Switch Status/
    ON or OFF
    		Brake pedal is depressed: ON
    Brake pedal is released: OFF
    		-
    NOTICE:
    In the table below, the value listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether apart is faulty or not.
    Result
    Result
    		Proceed to
    NG
    		A
    OK
    		B


B
Go to step 3
A


2.INSPECT STOP LIGHT SWITCH ASSEMBLY


    Corolla. Zre142 Aze141.U250E Automatic Transmission Transaxle.Automatic Transaxle System. Dtc P0724 Brake Switch B Circuit High

  1. Remove the stop light switch assembly.

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

    Standard resistance:
    Tester Connection
    		Switch position
    		Specified Condition
    1 - 2
    		Switch pin free
    		Below 1 Ω
    Switch pin pushed in
    		10 kΩ or higher
    3 - 4
    		Switch pin free
    		10 kΩ or higher
    Switch pin pushed in
    		Below 1 Ω


NG
REPLACE STOP LIGHT SWITCH ASSEMBLY (COROLLA_ZRE142 RM000002VPP018X.html)
OK


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


    Corolla. Zre142 Aze141.U250E Automatic Transmission Transaxle.Automatic Transaxle System. Dtc P0724 Brake Switch B Circuit High

  1. Install the stop light switch assembly.

  1. Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.

    Standard voltage:
    Condition
    		Tester Connection
    		Specified Condition
    A50-36 (STP) - Body ground
    		Brake pedal is depressed
    		11 to 14 V
    Brake pedal is released
    		Below 1 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE ECM (COROLLA_ZRE142 RM000002WT506MX.html)