Methods and systems for detecting high friction within flow control devices

A method for detecting a high friction within a flow control device of a fuel system, the method comprising:

• communicatively coupling a computing device and an engine controller;
• and
• operating the engine controller and the computing device to:
• receive with the engine controller from the computing device a service test sequence to execute a service test;
• perform with the engine controller, in response to receiving the service test sequence, the service test by controlling the flow control device to generate test data, the controlling including a first test cycle with a first dither level and a second test cycle with a second dither level;
• determine with the computing device whether a performance difference of the flow control device between the first test cycle and the second test cycle exceeds a predetermined threshold based on the test data;
• and
• detect with the computing device, in response to determining that the performance difference exceeds the predetermined threshold, a presence of high friction within the flow control device;
• output form the computing device a technician-perceptible notification of the presence of high friction within the flow control device,
• wherein the second dither level is different from the first dither level.

A non-transitory computer-readable medium storing instructions for detecting a high friction within a flow control device of a fuel system, the instructions when executed by one or more processors of a computing device, cause the computing device to:

• receive a service test sequence to execute a service test;
• perform, in response to a receipt of the service test sequence, the service test to generate test data, the service test including a first test cycle with a first dither level and a second test cycle with a second dither level;
• determine whether a performance difference of the flow control device between the first test cycle and the second test cycle exceeds a predetermined threshold based on the test data;
• and
• detect, in response to a determination that the performance difference exceeds the predetermined threshold, a presence of high friction within the flow control device,
• wherein the second dither level is different from the first dither level.