Patent ID: 8447458

Claim:
A vehicle, comprising: a ground-engaging device; a primary steering system power source configured to provide power to steer said ground-engaging device; a secondary steering system power source configured to provide power to steer said ground-engaging device; and a controller communicatively coupled to at least one of said primary steering system power source and said secondary steering system power source, said controller being configured to execute steps of a method to evaluate said secondary steering system power source, the method including the steps of: determining a first hydraulic fluid pressure provided by said primary steering system power source while the vehicle is traveling; sensing a second hydraulic fluid pressure provided by said secondary steering system power source while an operator of the vehicle is steering the vehicle as the vehicle travels at substantially a predetermined speed; and comparing said first hydraulic fluid pressure to said second hydraulic fluid pressure to determine if said secondary steering system power source provided fluid to steer said ground-engaging device.