Toyota Venza: Brake Switch "B" Circuit High (P0724)

Toyota Venza Service Manual / U660e Automatic Transmission / Transaxle / Automatic Transaxle System / Brake Switch "B" Circuit High (P0724)

DESCRIPTION

The purpose of this circuit is to prevent the engine from stalling when the brakes are suddenly applied while driving in the lock-up condition.

When the brake pedal is depressed, this switch sends a signal to the TCM. Then the TCM 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 signal circuit Stop light switch TCM

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 TCM interprets this as a fault in the stop light switch, illuminates the MIL, and stores the DTC. The vehicle must stop (less than 3 km/h (2 mph)) and go (30 km/h (19 mph) or more) five times for two consecutive driving cycles in order to set this DTC.

MONITOR STRATEGY

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

TYPICAL ENABLING CONDITIONS

The stop light switch remains ON during GO and STOP 5 times. GO and STOP are defined as follows;

The monitor will run whenever this DTC is not present.	None
GO: (Vehicle speed is 18.63 mph (30 km/h) or more)	18.65 mph (30 km/h) or more
STOP: (Vehicle speed is less than 1.86 mph (3 km/h))	Less than 1.86 mph (3 km/h)
Starter	OFF
Battery voltage	8 V or more
Ignition switch	ON

TYPICAL MALFUNCTION THRESHOLDS

Brake switch

Remains ON

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Perform the universal trip to clear permanent DTCs (See page ).

PROCEDURE

1.	READ VALUE USING DATA LIST (STP SIGNAL)

HINT:

Using the 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.

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.

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(d) Turn the Techstream on.

(e) Enter the following menus: Powertrain / ECT / Data List.

(f) According to the display on the Techstream, read the Data List.

Standard:

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

Item

Measurement Item/

Range (display)

Normal Condition

Stop Light Switch

Stop light switch status/

ON or OFF

Brake pedal is depressed: ON
Brake pedal is released: OFF

NOTICE:

In the table above, the conditions listed under "Normal Condition" are reference conditions. Do not depend solely on these reference conditions when deciding whether a part is faulty.

CHECK FOR INTERMITTENT PROBLEMS

2.	CHECK STOP LIGHT SWITCH ASSEMBLY INSTALLATION

(a) Check the stop light switch assembly installation (See page ).

OK:

Stop light switch assembly is installed correctly.

SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY

3.	INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Remove the stop light switch assembly.

(b) 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 Ω
3 - 4	Pin pushed	Below 1 Ω
1 - 2	Pin pushed	10 kΩ or higher
3 - 4	Pin not pushed	10 kΩ or higher

REPLACE STOP LIGHT SWITCH ASSEMBLY

4.	CHECK HARNESS AND CONNECTOR (STOP LIGHT SWITCH ASSEMBLY - TCM)

(a) Install the stop light switch assembly.

(b) Connect the stop light switch connector.

(d) 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
B40-12 (STP) - Body ground	Brake pedal is depressed	7.5 to 14 V
B40-12 (STP) - Body ground	Brake pedal is released	Below 1 V

Text in Illustration

*1	Front view of wire harness connector (to TCM)

REPLACE TCM

REPAIR OR REPLACE HARNESS OR CONNECTOR

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