Toyota Tundra. Manual — part 914

c. Reconnect the negative battery terminal.

TEST MODE PROCEDURE

HINT:



By switching the skid control ECU from normal mode to test mode, abnormality detection sensitivity is
enhanced and troubleshooting can be conducted efficiently.



Perform a sensor check in test mode after the speed sensor or sensor rotor has been repaired or replaced.



If the ignition switch is turned from ON to ACC or OFF during test mode, DTCs related to the signal
check function will not be erased. During test mode, do not change to normal mode.



During test mode, the skid control ECU stores all DTCs related to the signal check function, and the
DTCs are erased if normality is confirmed. Any remaining DTCs indicate abnormalities that were found.

1. TEST MODE (SIGNAL CHECK) PROCEDURE (WHEN USING TECHSTREAM)

a. Place the vehicle on a level surface with an inclination of less than +/-1°.

b. Turn the ignition switch OFF.

c. Check that the steering wheel is in the centered position.

d. Check that the shift lever is in parking or neutral and apply the parking brake.

e. Connect the Techstream to the DLC3.

f. Turn the ignition switch to ON.

g. Turn the Techstream on.

h. Switch the skid control ECU to test mode using the Techstream.

Enter the following menus: Chassis/ABS/VSC/ TRAC/Utility/Signal Check.

i. Check that the ABS warning light and VSC OFF and SLIP indicator lights blink as shown below.

Fig. 17: Identifying ABS Warning Light - Blinking Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

CAUTION: Application of the parking brake is not necessary for entering

test mode. However, apply the parking brake for safety.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

j. Start the engine.

2. TEST MODE (SIGNAL CHECK) PROCEDURE (WHEN USING SST CHECK WIRE)

a. Place the vehicle on a level surface with an inclination of less than +/-10.

b. Turn the ignition switch off.

c. Check that the steering wheel is in the centered position.

d. Check that the shift lever is in parking or neutral and apply the parking brake.

e. Using SST, connect terminals 12 (TS) and 4 (CG) of the DLC3.

SST 09843-18040

Fig. 18: Identifying DLC3 Connector Terminal TS And CG
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

f. Turn the ignition switch to ON.

g. Check that the ABS warning light, VSC OFF indicator light and SLIP indicator light blink as

shown below.

Fig. 19: Identifying ABS Warning Light - Blinking Pattern
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

h. Start the engine.

CAUTION: Application of the parking brake is not necessary for entering

test mode. However, apply the parking brake for safety.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

3. MASTER CYLINDER PRESSURE SENSOR CHECK

a. Leave the vehicle in a stationary condition and release the brake pedal for 1 second or more, and

quickly depress the brake pedal with a force of 98 N (10 kgf, 22 lbf) or more for 1 second.

b. Check that the skid control buzzer beeps for 1 second.

HINT:

Ensure that the skid control buzzer beeps.

4. YAW RATE SENSOR CHECK

a. Release the parking brake and drive the vehicle at a speed of 3 km/h (2 mph) or more, and turn the

steering wheel either to the left or right 90° or more to turn the vehicle 180°.

HINT:

The buzzer of the deceleration sensor check may sound while the vehicle is turning (refer to step 5
procedures). However, the yaw rate sensor check is only completed when the shift lever is moved
to N or P.

Fig. 20: Identifying Start And End Position Of Parking Brake
Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

b. Stop the vehicle and move the shift lever to N or P.

c. Check that the skid control buzzer sounds for 3 seconds.

HINT:



If the signal check has been completed normally, the skid control buzzer sounds and DTC
C0371/71 will be deleted.



If the skid control buzzer does not sound, check the skid control buzzer circuit (see SKID
CONTROL BUZZER CIRCUIT ). If the skid control buzzer still does not sound, there is a
malfunction in the yaw rate sensor, so check for DTCs.



At the end of the 180° turn, the direction of the vehicle should be within 175 to 185° of its
start position.



Do not spin the wheels.

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra

5. DECELERATION SENSOR CHECK

a. Release the parking brake and drive the vehicle at a speed of 3 km/h (2 mph) or more, and turn the

steering wheel either to the left or right 90° or more to turn the vehicle 180°.

b. Check that the skid control buzzer sounds for 3 seconds while the vehicle is turning.

HINT:



The skid control ECU checks whether the lateral acceleration reaches 0.1 G or more while
the vehicle is turning. When the lateral acceleration reaches 0.1 G, the skid control buzzer
sounds for 3 seconds.



The table shows the vehicle speeds and turning radius under which the lateral acceleration
reaches 0.1 G or more.

Reference

VEHICLE SPEED REFERENCE TABLE



If the signal check has been completed normally, the skid control buzzer sounds and DTC
C1279/79 will be deleted.



If the skid control buzzer does not sound, check the skid control buzzer circuit (see SKID
CONTROL BUZZER CIRCUIT ). If the skid control buzzer still does not sound, there is a
malfunction in the deceleration sensor, so check for DTCs.



Do not spin the wheels.

6. SPEED SENSOR CHECK

a. Check that the ABS warning light is blinking as shown below.

b. Check the reverse signal.

1. Drive the vehicle in reverse for more than 1 second at 3 km/h (2 mph) or more.

HINT:

Drive the vehicle in reverse and check the speed sensor signal. Note that the signal check
cannot be completed if the vehicle speed is 45 km/h (28 mph) or more.

Vehicle Speed km/h (mph)

Turning Radius m (ft.)

10 (6)

7.87 (25.82)

15 (9)

17.72 (58.13)

20 (12)

31.49 (103.31)

25 (16)

49.21 (161.45)

2009 Toyota Tundra

2009 BRAKES Brake Control - Tundra