Fig Checking ABS Warning Light And Vsc Trac Warning Light Blinking Pattern

REFERENCE CHAR

T

ABS warning light circuit

ABS WARNING LIGHT REMAINS ON or ABS WARNING LIGHT DOES NOT COME ON

VSC TRAC warning light circuit

VSC TRAC WARNING LIGHT REMAINS ON or VSC TRAC

WARNING LIGHT DOES NOT COME ON

TS terminal circuit

TS AND CG TERMINAL CIRCUIT

b. Check the yaw rate and deceleration sensor.

Shift the shift lever to the D position and drive the vehicle at a vehicle speed of approx. 3 mph (5 km/h), turn the steering wheel either to the left or right for 90° or more, and turn the vehicle through 180 degrees. Check that the VSC buzzer sounds for 3 seconds upon start off.

Stop the vehicle and shift the shift lever to the P position, and check that the VSC buzzer sounds again for 3 seconds.

Fig. 7: Checking Yaw Rate And Deceleration Sensor

HINT:

• If the VSC buzzer sounds twice, the sensor check has been completed normally.

• If the VSC buzzer does not sound, check the VSC buzzer circuit (See VSC BUZZER CIRCUIT ), then do the sensor check again.

• Drive the vehicle through 180°. At the end of the turn, the direction of the vehicle should be within 180°+- 5° of its start position

2007 BRAKES Brake Control - Sequoia

• If the buzzer sounds after start off, then the deceleration sensor check has passed its check. If the buzzer sounds at the completion of a curve, then the yaw rate sensor check has passed its check. The buzzer sound should be heard twice during the sensor checks.

c. Check the master cylinder pressure sensor.

1. Turn the ignition switch to the ON position.

2. Keep the vehicle in a stationary condition on a level surface for 2 sec. or more.

3. Keeping the vehicle in a stationary condition and not pressing on the brake pedal for 1 sec. or more, depress the brake pedal with 147 N (15 kgf, 33 lbf) or more for 2 sec. or more.

NOTE: If zero point calibration has never been performed on a new ECU, master cylinder pressure sensor check cannot be completed correctly. Perform zero point calibration first (See CALIBRATION ).

HINT:

At this time, the buzzer sounds for 3 seconds.

d. Check the speed sensor.

Drive the vehicle straight forward.

When driving the vehicle at the speed of 28 mph (45 km/h) or higher for several seconds, check that the ABS warning light goes off.

HINT:

There is a possibility that the sensor check is not completed if the vehicle has its wheels spun or its steering wheel turned during this check.

e. Stop the vehicle.

1. Using SST, connect terminals TC and CG of the DLC3.

Do It Yourself Car Diagnosis

Do It Yourself Car Diagnosis

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