Component Tests and General Diagnostics

Component Tests
Wheels and Tires
For wheel and tire specification information (pressures, torques, etc). For additional information, refer to Specifications Mechanical Specifications
When replacing wheels or tires, local legislation regarding health and safety must be complied with.
If the vehicle has a Tire Pressure Monitoring System installed, only manufacturer approved wheels and tires should be used. If the wheel and tire size is changed (for example from R18 to R20) the Tire Pressure Monitoring System module should be updated with the correct pressure information appropriate to the new wheel and tire set. Update the Tire Pressure Monitoring System module using the manufacturer approved diagnostic system.
As a general guideline, only replace tires in pairs or as a set, and only with tires of equivalent size and specification.
Confirm the symptoms of the customer complaint.
As much information as possible should be gathered from the driver to assist in diagnosing the cause(s).
1 Before a road test, carry out a basic inspection to make sure the vehicle is safe and legal to drive.

Basic inspection
- Correct tire inflation. For additional information, refer to Specifications Mechanical Specifications
- Legal tire tread depth
- Cuts/Bulges in tire sidewall(s)
- Tire ply separation
- Embedded objects
- Wheel rim damage
- Correct tire installation (specification, direction of rotation, etc)
- Any obvious distortion of the tire (flat/high spots)
- Worn/Damaged steering or suspension components