What should be checked for during steering wheel adjustment testing when the wheel is not turned to either side?

The focus during steering wheel adjustment testing, when the wheel is in its neutral position (not turned to either side), is on assessing straightness. This means evaluating whether the steering wheel is aligned correctly relative to the vehicle's direction. A straight steering wheel indicates that the vehicle should travel in a straight line without the need for constant correction from the driver.

If the steering wheel is not straight, it can suggest underlying issues such as misalignment of the front end or improper suspension settings. Assessing straightness is critical for ensuring safe and effective vehicle handling, as a misaligned steering wheel can lead to uneven tire wear and can compromise overall driving stability.

The other options, while relevant to steering performance in their own right, are not the primary focus during this specific adjustment test scenario. For instance, alignment typically refers to the geometrical measurements of the vehicle's wheels and how they relate to the road, while responsiveness deals with how quickly the vehicle reacts to steering input. Pressure might refer to tire pressure, which can influence handling but does not directly relate to the steering wheel’s position when it is not turned. Therefore, straightness is the correct and most pertinent aspect to check in this context.