CHECK HARNESS AND CONNECTOR (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) |
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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
Inspection procedure
HINT:
Using the intelligent tester to read the 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.
- Warm up the engine.
- Turn the ignition switch off.
- Connect the intelligent tester to the DLC3.
- Turn the ignition switch to ON.
- Turn the intelligent tester on.
- Enter the following menus: Powertrain / Engine and ECT / Data List.
- Follow the instructions on the intelligent tester and read the Data List.
| Item | Measurement Item/ Range (Display) | Normal Condition | Diagnostic Note |
| STOP LIGHT SW (Stop Light Switch) | Stop light switch status/ ON or OFF |
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| 1.INSPECT STOP LIGHT SWITCH |
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Remove the stop light switch.
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Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection Switch Condition Specified Condition 1 - 2 Pin not pushed Below 1 ? Pin pushed 10 k? or higher 3 - 4 Pin not pushed 10 k? or higher Pin pushed Below 1 ?
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| OK | |
| 2.CHECK HARNESS AND CONNECTOR (ECM - BATTERY) |
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Disconnect the ECM connector.
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Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection Condition Specified Condition A38-36 (STP) - Body ground Brake pedal is depressed 11 to 14 V A38-36 (STP) - Body ground Brake pedal is released Below 1 V
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| OK | |
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