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TIRES/WHEELS - SERVICE INFORMATION DIAGNOSIS AND TESTING TIRE AND WHEEL VIBRATION Tire and wheel imbalance, runout and force variation can cause vehicles to exhibit steering wheel vibration. VISUAL INSPECTION Visual inspection of the vehicle is recommended prior to road testing or performing any other procedure. Raise the Inspect for the following: • Verify correct (OEM) wheel and tire, as well as correct wheel weights. • Inspect tires and wheels for damage, mud packing and unusual wear; correct as necessary. • Check and adjust tire air pressure to the pressure listed on the label attached to the driver’s door opening. ROAD TEST Road test vehicle on a smooth road for a least five miles to warm tires (remove any flat spots). Lightly place hands Observe the steering wheel for: • Visual Nibble (oscillation: clockwise/counterclockwise, usually due to tire imbalance) • Visual Buzziness (high frequency, rapid vibration up and down) To rule out vibrations due to brakes or powertrain: • Lightly apply brakes at speed; if vibration occurs or is enhanced, vibration is likely due to causes other than • Shift transmission into neutral while vibration is occurring; if vibration is eliminated, vibration is likely due to For brake vibrations, (Refer to 5 - BRAKES - BASE/HYDRAULIC/MECHANICAL/ROTOR - DIAGNOSIS AND TEST- For powertrain vibrations, (Refer to 3 - DIFFERENTIAL & DRIVELINE - DIAGNOSIS AND TESTING). For tire and wheel assembly vibrations, continue with this diagnosis and testing procedure. TIRE AND WHEEL BALANCE 1. Balance the tire and wheel assemblies as necessary following the wheel balancer manufacturer’s instructions and using the information listed in Tire And Wheel Balance. (Refer to 22 - TIRES/WHEELS - STANDARD PRO- 2. Road test the vehicle for at least 5 miles, following the format described in Road Test. 3. If the vibration persists, continue with this diagnosis and testing procedure. PM TIRES/WHEELS - SERVICE INFORMATION 22 - 55 |