Toyota Tundra. Manual — part 1591

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS

INSPECTION PROCEDURE

1. CHECK DTC

a. Clear DTC (See DTC CHECK/CLEAR ).

b. Turn the ignition switch off.

c. Disconnect the cable from the negative (-) battery terminal and wait for 1 minute.

d. Connect the cable to the negative (-) battery terminal.

e. Turn the ignition switch to ON for 10 seconds.

f. Turn the ignition switch off.

g. Turn the ignition switch to ON.

h. Check DTC.

OK:

P0657 is not present.

NG: REPLACE ECM (See REMOVAL )

OK: INTERMITTENT PROBLEMS (See CHECK FOR INTERMITTENT PROBLEMS )

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

Required sensors/components (sub)

Throttle actuator

Frequency of operation

Once per driving cycle

Duration

Within 1 second

MIL operation

Immediate

Sequence of operation

None

gnition switch

From ON to off

Throttle actuator power supply

7 V or more

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

of the lock-up clutch while braking is in progress.

DTC DETECTION CONDITION AND TROUBLE AREA REFERENCE CHART

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.

MONITOR STRATEGY

MONITOR STRATEGY

TYPICAL ENABLING CONDITIONS

TYPICAL ENABLING CONDITIONS

TYPICAL MALFUNCTION THRESHOLDS

TYPICAL MALFUNCTION THRESHOLDS CONDITIONS

WIRING DIAGRAM

DTC

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)



Short in stop light switch
signal circuit



Stop light switch



ECM

Related DTCs

P0724 Stop light switch/Range check/Rationality

Required sensors/Components

Stop light switch, Vehicle speed sensor

Frequency of operation

Continuous

Duration

GO and STOP 5 times

MIL operation

2 driving cycles

Sequence of operation

None

The monitor will run whenever this DTC is not present.

None

Battery voltage

8 V or more

Starter

OFF

gnition switch

ON

GO (Vehicle speed is 30 km/h (18.65 mph) or more)

Once

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

Once

Brake switch

Stuck ON

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

Fig. 205: Brake Switch - Wiring Diagram
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

INSPECTION PROCEDURE

HINT

Using the Techstream 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.

1. Warm up the engine.

2. Turn the ignition switch off.

3. Connect the Techstream to the DLC3.

4. Turn the ignition switch to ON.

5. Turn the Techstream ON.

6. Enter the following menus Powertrain/Engine and ECT/Data List.

7. Follow the instructions on the Techstream and read the Data List.

DATA LIST

NOTE:

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.

Item

Measurement Item/Range

(Display)

Normal Condition

Diagnostic

Note

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra

1. INSPECT STOP LIGHT SWITCH

a. Remove the stop light switch.

Fig. 206: Inspecting Stop Light Switch Assembly
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Measure the resistance according to the value (s) in the table below.

Standard resistance

RESISTANCE SPECIFIED CONDITIONS

NG: REPLACE STOP LIGHT SWITCH (See REMOVAL )

OK: Go to Next Step

2. CHECK HARNESS AND CONNECTOR (ECM - BATTERY)

a. Disconnect the A24 ECM connector.

Stop Light
Switch

Stop light switch status/ ON or
OFF



Brake pedal is depressed
ON



Brake pedal is released
OFF

-

Tester Connection Switch Condition Specified Condition

1 - 2

Pin not pushed

Below 1 ohms

Pin pushed

10 kohms or higher

3 - 4

Pin not pushed

10 kohms or higher

Pin pushed

Below 1 ohms

2009 Toyota Tundra

2009 ENGINE PERFORMANCE Engine Control System (3UR-FBE) - Tundra