Accumulator check method

An accumulator checking method for a suspension system of a vehicle, the accumulator checking method comprising:

• selectively setting a present state of an accumulator check for the suspension system to a first state;
• determining first target open and closed states for valves of the suspension system based on the present state being set to the first state;
• selectively opening and closing the valves of the suspension system according to the first target open and closed states, respectively;
• when the valves are in the first target open and closed states, respectively, selectively operating an electric pump of the suspension system in a first direction and increasing a pressure of hydraulic fluid in a first portion of the suspension system including an accumulator;
• selectively opening one or more of the valves and decreasing the pressure in the first portion after the increasing;
• selectively recording the pressure in the first portion based on a second derivative of the pressure while the pressure is decreasing;
• and
• selectively diagnosing a fault in the accumulator based on the recorded pressure.