Dtc P0724 Brake Switch B Circuit High. Corolla ZZE150
DESCRIPTION
MONITOR DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
READ VALUE OF 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 Detection 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).
| - Short in stop light switch circuit
- Stop light switch
- 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.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.READ VALUE OF DATA LIST |
- УКАЗАНИЕ:
- Using the intelligent tester 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.
Warm up the engine.
Turn the ignition switch off.
Connect the intelligent tester to the DLC3.
Turn the ignition switch on (IG).
Turn on the tester.
Select the item "Enter / Powertrain / Engine and ECT / Data List".
According to the display on the tester, read the "Data List".
Standard:Tester Display
| Measurement Item/Range
| Normal Condition
| Diagnostic Note
|
Stop Light Switch
| Stop light switch Status/ON or OFF
| - Brake Pedal is depressed: ON
- Brake Pedal is released: OFF
| -
|
- ПРИМЕЧАНИЕ:
- In the table above, the value listed under "Normal Condition" are reference values. Do not depend solely on these reference values when deciding whether a part is faulty or not.
- Result:
| 2.INSPECT STOP LIGHT SWITCH ASSEMBLY |
Remove the stop light switch assembly.
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
|
| 3.CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - ECM) |
Install the stop light switch assembly.
Disconnect the ECM connector.
Measure the voltage according to the value(s) in the table below when the brake pedal is depressed and released.
- Standard voltage:
Tester Connection
| Condition
| Specified Condition
|
A50-36 (STP) - Body ground
| Brake pedal is depressed
| 11 to 14 V
|
Brake pedal is released
| Below 1 V
|
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
