Canada - ABS/TCS - Warning Lamp ON/DTC's C1247/C1310 Set
Bulletin
TSB2483R
Issue Date
2006-04-06
Market
Canada
Title
DTC C1247 & C1310: SKID CONTROL COMPUTER LOGIC CHANGE
Component
BRAKES
Models
'03 - '05 Sequoia
TSB REVISION NOTICE:
- August 21, 2007: Step 1A of the Calibration Procedure has been updated.
Previous versions of TSB should be discarded.
INTRODUCTION:
Some 2003 -- 2005 model year Sequoia vehicles may exhibit the Brake, ABS, and/or VSC warning lights coming ON with DTC C1247 and/or C1310 stored in the skid control computer memory with no problem found. A software change has been made to the skid control computer logic to correct this condition.
APPLICABLE VEHICLES:
- 2003 - 2005 model year Sequoia vehicles produced BEFORE the Production Change Effective VINs shown below.
PRODUCTION CHANGE INFORMATION:
PARTS INFORMATION:
WARRANTY INFORMATION:
REQUIRED SSTs:
REPAIR PROCEDURE:
1. Confirm the ABS/TRAC/VSC skid control computer has DTC codes C1247 and/or C1310.
2. Follow the diagnostics for these DTCs. Refer to the specific model year Repair Manual on ETAS.
In the event that NO problem can be found for these DTCs, replace the skid control computer.
3. To remove and replace the ABS/TRAC/VSC skid control computer following the procedures outlined on ETAS, 2003, 2004, or 2005 model year Sequoia Repair Manual: Brake: ABS & VSC Actuator: Disassembly and Reassembly.
4. Calibrate skid control computer using the following calibration procedure.
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.
- Be sure to perform calibration on a level surface (with less than 1% inclination).
ONLY perform step 1 for the 2003 -- 2004 model year 4WD Sequoia vehicles.
1. 2003 - 2004 Model Year 4WD Sequoia: Whenever replacing the Skid Control ECU, registration of the new ECU MUST first be performed.
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. Go to step 2.
2. Perform master cylinder pressure, yaw rate, and deceleration sensor zero point calibration.
A. Connect the Diagnostic Tester to DLC3.
B. Move the shift lever to the "P" position.
C. Start the engine.
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 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.
6. Test drive the vehicle to confirm the repair is complete.
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.