General Diagnostic Chart: Inspection

WARNING: This page is about a different car, the 2011 Subaru Tribeca. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Vibration while cruising may be caused by an unbalanced tire, improper tire inflation pressure, improper wheel alignment, etc.

DIAGNOSTIC CHART

Symptom	Possible cause	Corrective action
Noise or vibration from propeller shaft	Center bearing	Check the center bearing. Refer to CENTER BEARING FREE PLAY , INSPECTION, Propeller Shaft.
	Runout of propeller shaft	Check for deflection of the propeller shaft. Refer to RUNOUT OF PROPELLER SHAFT , INSPECTION, Propeller Shaft.
	Loose or gap at connections	Check the joints and connectors. Refer to JOINTS AND CONNECTIONS , INSPECTION, Propeller Shaft.
	Loose or gap at connections	Check the spline and bearing. Refer to SPLINES AND BEARING , INSPECTION, Propeller Shaft.
Abnormal wheel vibration	Wheel is out of balance.	Check the wheel balance. Refer to WHEEL AND TIRE SYSTEM .
	Front wheel alignment	Check the front wheel alignment. Refer to INSPECTION , Wheel Alignment.
	Rear wheel alignment	Check the rear wheel alignment. Refer to INSPECTION , Wheel Alignment.
	Front strut	Check the front strut. Refer to INSPECTION , Front Strut.
	Rear shock absorber	Check the rear shock absorber. Refer to INSPECTION , Rear Shock Absorber.
	Front drive shaft	Check the front drive shaft. Refer to INSPECTION , Front Drive Shaft.
	Rear drive shaft	Check the rear drive shaft. Refer to INSPECTION , Rear Drive Shaft.
	Front hub unit bearing	Check the front hub unit bearing. Refer to INSPECTION , Front Hub Unit Bearing.
	Rear hub unit bearing	Check the rear hub unit bearing. Refer to INSPECTION , Rear Hub Unit Bearing.
Noise from the underbody	Wheel is out of balance.	Check the wheel balance. Refer to WHEEL AND TIRE SYSTEM .
	Front wheel alignment	Check the front wheel alignment. Refer to INSPECTION , Wheel Alignment.
	Rear wheel alignment	Check the rear wheel alignment. Refer to INSPECTION , Wheel Alignment.
	Front strut	Check the front strut. Refer to INSPECTION , Front Strut.
	Rear shock absorber	Check the rear shock absorber. Refer to INSPECTION , Rear Shock Absorber.