Toyota Venza manuals

Toyota Venza: 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.

(c) Turn the ignition switch to ON.

(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

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.


OK

CHECK FOR INTERMITTENT PROBLEMS


NG

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.


NG

SECURELY REINSTALL STOP LIGHT SWITCH ASSEMBLY


OK

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


NG

REPLACE STOP LIGHT SWITCH ASSEMBLY


OK

4.

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

(a) Install the stop light switch assembly.


(b) Connect the stop light switch connector.

(c) Disconnect the TCM 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)


OK

REPLACE TCM


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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