Mazda MX-5 Miata Sport 2007 Manual page 1747

4. Start the engine and warm the power steering fluid to 50-60°C {122-140°F} .
5. Measure the steering wheel effort using a torque wrench.
If not within the specification, verify the following:

No air in steering system

No fluid leakage at hose or connectors

Function of oil pump and steering gear

Steering wheel effort
7.8 N.m {80 kgf.cm, 58 in.lbf} max.
Fig. 8: Measuring Steering Wheel Effort Using Torque Wrench
Courtesy of MAZDA MOTORS CORP.
NOTE:
2007 Mazda MX-5 Miata Sport
2007 STEERING Power Steering - MX-5 Miata
bag module. (See AIR BAG SYSTEM SERVICE WARNINGS .)
(See AIR BAG SYSTEM SERVICE CAUTIONS .)
To determine whether the steering effort is satisfactory or not,

perform the inspection on another vehicle of the same model and
under the same conditions, and compare the results.