DEFINITION: Driver is unable to maintain consistent, predictable vehicle driving control in any direction.

Did you review the General Description and perform the necessary inspections?

Go to Step 2

Go to Diagnostic Starting Point - Suspension General Diagnosis

Verify that the directional stability is poor.

Does the system operate normally?

System OK

Go to Step 3

1. Ensure that the tires are all the same size, make, and adequate tread depth.
2. Repair as necessary.
3. Ensure that all of the tires are inflated to the correct pressure. Refer to Vehicle Certification, Tire Placard, Anti-Theft, and Service Parts ID Label .

Does the vehicle still exhibit poor directional stability?

Go to Step 4

System OK

1. Inspect the stabilizer shaft, links, and insulators for wear or damage.
2. Replace as necessary. Refer to the following:

•	Stabilizer Shaft Replacement

•	Stabilizer Shaft Link Replacement

Does the vehicle still exhibit poor directional stability?

Go to Step 5

System OK

1. Inspect the front axle, king pins, king pin bushings, and steering Linkage for wear or damage.
2. Repair as necessary. Refer to the following:

•	Front Axle Replacement

•	Steering Knuckle and King Pin Replacement

•	King Pin Bushing and Bearing Cup Replacement

•	Steering Linkage Inspection

Does the vehicle still exhibit poor directional stability?

Go to Step 6

System OK

Inspect the wheel bearings/hubs for looseness or excessive lateral runout. Refer to Wheel Bearings Diagnosis

Does the vehicle still exhibit poor directional stability?

Go to Step 7

System OK

1. Inspect the vehicle trim height. Refer to Trim Height Inspection .
2. Repair as necessary.

Does the vehicle still exhibit poor directional stability?

Go to Step 8

System OK

Inspect and adjust the wheel alignment as necessary. Refer to Front Caster Adjustment or Front Camber Adjustment or Front Toe Adjustment .

Does the vehicle still exhibit poor directional stability?

Go to Step 9

System OK

1. Inspect the steering gear and steering column for looseness.
2. Repair as necessary.

Did you complete the repair?

Go to Step 10

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Operate the vehicle in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3