When measuring power steering pressure with warm fluid, what is considered an acceptable reading while the engine is idling?

When measuring power steering pressure with warm fluid, an acceptable reading while the engine is idling typically falls around the range of 100 psi. This pressure indicates that the power steering pump is functioning correctly under normal operating conditions.

A reading of 100 psi signifies that the system has sufficient pressure to assist in steering without straining the pump or affecting the steering performance. This level of pressure ensures that there is enough hydraulic fluid being pressurized to provide the necessary steering assistance to the driver while maintaining a smooth operation.

Other options, such as 0 psi, would suggest a complete failure of the power steering pump or a significant fluid leak, leading to the inability to assist in steering. Readings of 500 psi or 1,000 psi are higher than typical for a system at idle and might indicate issues like pump overload or blockage, which could lead to damage in the system. Thus, 100 psi is considered optimal and aligns with standard operational values for a properly functioning power steering system.