Canada - Steering - VSC Zero Point Calibration Procedure

Bulletin
TSB2492R

Issue Date
2006-04-10

Market
Canada

Title
VSC-RELATED ZERO POINT CALIBRATION & SENSOR CHECK

Component
BRAKES

Models
'03 - '06 Sequoia

TSB REVISION NOTICE:
- August 21, 2007: Step 1B of the Calibration Procedure has been updated.
Previous versions of TSB should be discarded.

INTRODUCTION:
The following information is intended to clarify the repair manual procedures for using the Toyota Diagnostic Tester to perform zero point calibration and sensor checks after the replacement of any of the following components on 2003 -- 2006 model year Sequoia vehicles.
- Vehicle Skid Control Computer
- Steering Angle Sensor
- Master Cylinder Pressure Sensor
- Yaw Rate Sensor
- Deceleration Sensor

Zero point calibration of the above sensors must also be performed when replacing or repairing steering related parts and when changing the vehicle's straight ahead condition for toe adjustment.

APPLICABLE VEHICLES:
- 2003 - 2006 model year Sequoia vehicles.






WARRANTY INFORMATION:






REQUIRED SSTs:

CALIBRATION PROCEDURE:

NOTE:
Whenever replacing the master cylinder pressure sensor, yaw rate and deceleration sensor, or the Skid Control ECU, make sure to perform zero point calibration.
- While performing the zero point calibration:
- Do not tilt, move, or shake the vehicle.
- The vehicle must maintain a stationary position.
- Do not start the engine.
- Be sure to perform calibration on a level surface (within an inclination of 1%).

1. Whenever replacing the Skid Control ECU, registration of the new ECU must first be performed.
A. For 2WD models: Registration is complete. Proceed to step 2.
B. For 4WD models:
a. Vehicles with Transfer Lever: After turning the ignition switch ON, with the shifter in the "P" position, move the transfer lever to the "L4" position.

Vehicles with Push Button Selector: Place the vehicle in NEUTRAL, press the "L4" button, and then place the vehicle in the "P" position.

b. At this time, the VSC system buzzer will sound for 3 seconds indicating that registration is complete. Now turn the ignition switch OFF. Proceed to step 2.

NOTE:
For the 2001 -- 2002 model year Sequoia zero point calibration procedure, refer to TSB No. 1041, "VSC Related Zero Point Calibration and Sensor Check".

2. Perform master cylinder pressure, yaw rate, and deceleration sensor zero point calibration.
A. Connect Diagnostic Tester to DLC3.
B. Move the shift lever to the "P" position.
C. Turn the ignition switch to the "ON" position.






D. Place the Diagnostic Tester into Signal Check mode under the ABS/VSC menu.
E. Keep the vehicle in a stationary position on a level surface for 4 seconds or more.
F. For 2WD models: Press the TRAC OFF switch 3 times within 3 seconds without pressing the brake pedal.
G. For 4WD models: Press the center differential lock (TRAC OFF) switch 3 times within 3 seconds without pressing the brake pedal.
H. Check that the VSC buzzer sounds for 3 seconds.






NOTE:
If the VSC buzzer does not sound:
- Repeat the zero point calibration procedures listed in Step 2.
- Check the VSC buzzer circuit.

I. Zero point of master cylinder pressure, yaw rate and deceleration sensor is complete. Proceed to step 3.

3. Perform steering angle sensor zero point calibration.
A. Disconnect the Diagnostic Tester.
B. Calibrate the steering angle sensor by driving the vehicle above 28 mph (45 km/h).

4. Confirm zero point calibration.
A. Stop the vehicle.
B. Place the shifter in the "P" position.
C. Connect the Diagnostic Tester to DLC3.






D. View the ABS/VSC Data List to see that the steering angle value changes when turning the steering wheel.

5. Disconnect the Diagnostic Tester and turn the ignition switch OFF.

NOTE:
Issue of this Technical Service Bulletin is to ensure that proper repair information is available. IT DOES NOT CONSTITUTE AN AUTHORIZATION FOR REPAIR. Normal provisions of the formal warranty policy, as applicable, will apply.