A technician suspects a power steering issue. What should the engine state be during diagnosis?

During diagnosis of a power steering issue, having the engine running with the wheels straight is the most effective approach. This state allows the technician to evaluate the power steering system under conditions similar to normal operation, ensuring that the hydraulic pressures can be assessed accurately.

When the engine is running, the power steering pump is operational, which is crucial for any diagnosis involving potential leaks, noises, or responsiveness in the steering system. Keeping the wheels straight helps to create a stable environment, allowing for a clearer assessment of the system's performance rather than introducing additional variables that could obscure the results of the diagnosis.

In contrast, having the engine off or draining the system would not facilitate the observation of the system's functionality, while starting the engine with the steering wheel centered does not provide the same comprehensive evaluation as having the wheels straight. Additionally, running the engine at high RPMs while assessing leaks may lead to inaccurate symptoms or could even exacerbate potential issues, making it less desirable for effective diagnosis.