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This bulletin contains general vehicle pulling diagnosis and repair procedures along with specific information to help correct pulling complaints. This information supplements Repair Manual procedures when the symptoms are: The driver holds the steering wheel without exerting steering effort while driving straight ahead, the vehicle drifts to the right or the left. Applicable Vehicles : 2002 – 2007 model year Toyota vehicles, 2004 – 2007 model year Scion vehicles. Relationship Between Wheel Alignment and Vehicle Pulling to One Side When the cross camber or caster of the front wheel alignment is large, it can cause vehicle pulling. Wheel alignment and tire characteristic. If the cross camber or caster is within the specified range (30’ or less), noticeable vehicle pulling will not occur due to side-to-side differences in camber or caster. When radial tires are rotating, they have the characteristic of generating force in the lateral direction between the tire and the road surface. This lateral force is comprised of two factors: Ply-Steer Lateral force due to ply-steer is produced by the construction of the belts inside the tire tread. With radial tires, the wire of the belt is slanted as shown in the illustration below. Conicity Conicity is lateral force resulting from uneven formation of the left and right sides of the tire. The direction the lateral force is exerted depends on the hardness of the side walls and the difference in height between the left/right sides of the tire. Troubleshooting First determine whether vehicle pulling to one side is caused by a wheel alignment problem or tire characteristics, then decide which repairs to make. Confirm problem symptoms. If the problem is steering wheel off center, adjust the front tie rods on the vehicle. Refer to Toyota TSB ST003-01. Also check the direction of vehicle pulling and the extent of the pulling.
Tags : front wheel alignment, alignment problem, information supplements, toyota repair, radial tires, lateral force, lateral direction, toyota vehicles, manual supplement, steering wheel, tie rods, tire tread, side walls, camber, road surface
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