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

Road test the vehicle in order to verify the customer complaint.

Does the vehicle exhibit poor directional stability?

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Go to Step 2

System OK

1. Ensure that the tires are all the same size, make, and adequate tread depth.
2. Replace as necessary.
3. Ensure that all of the tires are inflated to the correct pressure. Refer to Tire Inflation Pressure Specifications in Maintenance and Lubrication.

Does the vehicle still exhibit poor directional stability?

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Go to Step 3

System OK

1. Inspect the stabilizer shaft, links, and insulators for wear or damage.
2. Replace as necessary. Refer to Stabilizer Shaft Replacement in Front Suspension.

Does the vehicle still exhibit poor directional stability?

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Go to Step 4

System OK

1. Inspect the lower control arms, ball joints and tie rods for wear or damage.
2. Replace as necessary. Refer to the following:

•	Lower Control Arm Replacement in Front Suspension.

•	Lower Control Arm Ball Joint Replacement or in Front Suspension.

•	Tie Rod Replacement in Steering Linkage.

Does the vehicle still exhibit poor directional stability?

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Go to Step 5

System OK

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

Does the vehicle still exhibit poor directional stability?

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Go to Step 6

System OK

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

Does the vehicle still exhibit poor directional stability?

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Go to Step 7

System OK

Inspect and adjust the wheel alignment as necessary. Refer to Wheel Alignment Measurement in Wheel Alignment.

Does the vehicle still exhibit poor directional stability?

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Go to Step 8

System OK

1. Inspect the steering gear and steering column for looseness. Refer to Wander or Poor Steering Stability in Power Steering System.
2. Replace as necessary.

Does the vehicle still exhibit poor directional stability?

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Go to Step 1

System OK