Alignment of the front wheels is essential if your car is to roll, stop and turn as designed. Alignment can be altered by collision, overloading, poor repair or bent components.
If you are diagnosing handling problems, the first place to look is at the tires. Although the tires may wear as a result of an alignment problem, worn or poorly inflated tires can make you chase alignment problems that don't exist. If problems still occur after checking the tires and suspension parts for damage or wear, take the vehicle to a qualified alignment technician for checking and adjustment.
Caster is the tilting of the steering axis either forward or backward from the vertical, when viewed from the side of the vehicle. A backward tilt is said to be positive and a forward tilt is said to be negative. The caster is not adjustable on the Celica. If not within specifications, replace the damaged parts involved.
Camber is the tilting of the wheels from the vertical (leaning in or out) when viewed from the front of the vehicle. When the wheels tilt outward at the top, the camber is said to be positive. When the wheels tilt inward at the top the camber is said to be negative. The amount of tilt is measured in degrees from the vertical. This measurement is associated with steering axis inclination, which can be used to identify bent parts. Only 1986-88 Celica models have adjustable front camber.
Toe is the turning in or out (parallelism) of the wheels. The actual amount of toe setting is normally only a fraction of an inch. The purpose of toe-in (or out) specification is to ensure parallel rolling of the wheels. Toe-in also serves to offset the small deflections of the steering support system which occur when the vehicle is rolling forward or under braking. Toe profoundly affects tire wear.