Canada - Scantool - Zero Point Calibration/Sensor Check
Bulletin
1041
Issue Date
2002-02-14
Reference
BR-01-010
Model
Sequoia
Year Range
2001, 2002
Market
Canada
Component
BR
Subject:
VSC RELATED ZERO POINT CALIBRATION AND SENSOR CHECK
The following information is intended to clarify the repair manual procedures for performing zero point calibration and sensor checks on a 2001 - 2002 model year Sequoia. Calibration should be done after having performed any repairs for VSC codes such as C1231, C1232, C1234 or when replacing VSC components listed below:
- 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:
2001 - 2002 model year Sequoia vehicles.
REQUIRED TOOLS AND MATERIALS:
CALIBRATION PROCEDURE:
Prior to calibration, all ABS and VSC DTC codes must be cleared.
1. Clear all ABS and VSC DTC Codes.
A. In cases when not using TOYOTA scan tool
a. Using SST, connect terminals Tc and CG of DLC3.
b. Turn the ignition switch ON.
c. Clear the DTC stored in ECU by depressing the brake pedal 8times or more within 5seconds.
d. Check that the warning light shows the normal code. (A cycle of 0.25sec. ON and 0.25sec. OFF is repeated.)
e. Remove the SST from the terminals of DLC3.
B. In cases when using TOYOTA scan tool
a. Connect the Toyota scan tool to the DLC3.
b. Turn the ignition switch ON.
c. Operate the Toyota scan tool to erase the codes.
2. Perform Zero Point Calibration on Sensors.
A. Enter "Signal Check" mode
a. In cases when not using TOYOTA scan tool
1. Turn the ignition switch OFF.
2. Using SST, connect terminals Ts and CG of DLC3.
3. Start the engine.
b. In cases when using TOYOTA scan tool
Enter "Signal Check" mode on Toyota scan tool (after verifying connection, go to "Trouble Data" then to "Signal Check").
B. All remaining steps must be completed before exiting "Signal Check" mode or additional codes will be set.
NOTE:
- Perform calibration on a level surface.
- If VSC ECU is being replaced on a 4WD vehicle:
- A new VSC ECU is set up for 2WD vehicles and must be change to 4WD.
- Turn the ignition switch ON, with transmission shift lever in the "P" position. Then move the transfer shift lever to the "L4" position.
- When the VSC ECU has recognized the vehicle as 4WD by the above procedure, the buzzer will beep for 3 seconds.
- Once the VSC ECU has been changed for 4WD vehicle, it can never be changed back to 2WD.
C. Ensure transmission is in the "P" position.
D. Turn the steering wheel at least 5 degrees in each direction. Then hold the the steering wheel straight ahead (0 degrees).
E. Press the VSC OFF (or TRAC OFF) switch 3 times within 3 seconds.
F. The VSC buzzer should sound for 3 seconds.
3. Perform Sensor Check.
A. Check that the shift lever is in the "P" position. Check that the steering wheel is at 0 degrees.
a. Check that the ABS warning light and VSC TRAC warning light blinks.
b. Keep the vehicle stationary for at least 4 seconds.
B. Check the Deceleration and Yaw Rate Sensor
a. Shift the transmission into the "D" position and drive the vehicle at approximately 5 kph, turn the steering wheel 90 degrees or more to the left or right and complete a "U turn" (180 degrees).
NOTE:
- When completing the U turn, the ending position should be 180 degrees ± 5 degrees of the starting position.
- Do not spin the wheels while performing this check.
b. The VSC buzzer should sound at the beginning of the turn, indicating the completion of the deceleration sensor check.
c. Stop the vehicle and shift the lever to the "P" position.
d. The VSC buzzer should sound for 3 seconds, indicating the completion of the yaw rate sensor check.
C. Check the master cylinder pressure sensor.
a. Keep the vehicle stationary for at least 2 seconds.
b. With the transmission in the "P" position, do not apply any pressure to the brake pedal for at least 1 second.
c. Press the pedal with at least 147 N (15 kgf, 33 lbf) for at least 2 seconds.
d. The VSC buzzer should sound for 3 seconds indicating the completion of the master cylinder pressure sensor check.
D. Check steering angle sensor.
a. Turn the steering wheel left or right to full lock position. Hold for at least 1 second, then turn the wheel to the opposite full lock position and hold for at least 1 second.
b. The VSC buzzer should sound for 3 seconds indicating the completion of the steering angle sensor check.
E. Check wheel speed sensors.
a. Drive the vehicle straight ahead at or above 28 mph/45 kph for several seconds. When the sensor is normal and the speed gets up to 28 mph/45 kph, ABS warning light turns off. After this, ABS warning light stays off until the vehicle comes to a stop. When the vehicle comes to a stop, the ABS warning light will flash again.
NOTE:
It is not a problem to drive the vehicle through turns prior to step E. a. Therefore, it is not a problem to exit the parking lot, etc. in order to perform wheel speed sensor check on a street.
4. Check ABS and VSC DTC Codes
A. In cases when not using TOYOTA scan tool
a. Using SST, connect terminals Tc and CG of DLC3.
b. Read the number of blinks of the warning light.
c. Disconnect terminals Ts and CG, Tc and CG of DLC3, and turn the ignition switch OFF.
B. In cases when using TOYOTA scan tool
a. Use the Toyota scan tool to the vehicle and check for trouble codes.
b. Refer to the Toyota hand-held tester operator's manual for further details.
c. Turn the ignition switch OFF and remove Toyota scan tool.
d. Ensure that the vehicle is in 2WD mode prior to returning it to the customer.
NOTE:
If at any time during the sensor check procedure, the appropriate buzzer does not sound, check the VSC buzzer circuit according to Repair Manual Procedures.
- 2001 MY - 2001 Sequoia RM832U1
- 2002 MY - 2002 Sequoia RM886U1
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.