Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIMP
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 - 08/2016]
Title: U660F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: P0724; Brake Switch "B" Circuit High; 2016 MY Sienna [12/2015 - 08/2016]

DTC

P0724

Brake Switch "B" Circuit High

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 assembly remains ON even when the vehicle is driven in a STOP (less than 3 km/h (1.86 mph)) and GO (30 km/h (18.65 mph) or more) fashion 5 times. (2-trip detection logic).

  • Short in stop light switch assembly signal circuit
  • Stop light switch assembly
  • TCM

MONITOR DESCRIPTION

This DTC indicates that the stop light switch assembly remains ON. When the stop light switch assembly remains ON during "stop and go" driving, the TCM interprets this as a fault in the stop light switch assembly, illuminates the MIL, and stores the DTC. The vehicle must stop (less than 3 km/h (1.86 mph)) and go (30 km/h (18.65 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 assembly

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 assembly 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 30 km/h (18.65 mph) or more)

30 km/h (18.65 mph) or more

STOP: (Vehicle speed is less than 3 km/h (1.86 mph))

Less than 3 km/h (1.86 mph)

Starter

OFF

Battery voltage

8 V or more

Ignition switch

ON

TYPICAL MALFUNCTION THRESHOLDS

Switch status

ON

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Inspect the fuses for circuits related to this system before performing the following inspection procedure.
  • Perform the universal trip to clear permanent DTCs (See page 2016 MY Sienna [12/2015 - 08/2016]; U660F (AUTOMATIC TRANSMISSION / TRANSAXLE): AUTOMATIC TRANSAXLE SYSTEM: DTC CHECK / CLEAR ).

1. DATA LIST

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) Warm up the engine.

(b) Turn the ignition switch off.

(c) Connect the Techstream to the DLC3.

(d) Turn the ignition switch to ON.

(e) Turn the Techstream on.

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

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

ECT

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Stop Light Switch

Stop light switch status assembly /

ON or OFF

Brake pedal is

  • ON: Depressed
  • OFF: Released

-

PROCEDURE

1.

INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Inspect the stop light switch assembly (for Bulb Type Stop Light) (See page 2016 - 2020 MY Sienna [12/2015 -        ]; LIGHTING (EXT): STOP LIGHT SWITCH: INSPECTION ).

NG

REPLACE STOP LIGHT SWITCH ASSEMBLY

OK

2.

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

(a) Install the stop light switch assembly.

(b) Connect the stop light switch assembly connector.

(c) Disconnect the TCM connector.

(d) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

B2-12 (STP) - Body ground

Brake pedal is depressed

7.5 to 14 V

Brake pedal is released

Below 1 V

Text in Illustration

*a

Front view of wire harness connector

(to TCM)

OK

REPLACE TCM

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR