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A method is provided for testing multiple elements of a work machine, including a control system, a component, a sub-component that is influenced by operations of the component, and a sensor that monitors a characteristic of the sub-component. In one embodiment, the method is performed by the contro

A method is provided for testing multiple elements of a work machine, including a control system, a component, a sub-component that is influenced by operations of the component, and a sensor that monitors a characteristic of the sub-component. In one embodiment, the method is performed by the control system and includes sending a command to the component to adjust a first parameter associated with an operation of the component. Also, the method includes detecting a sensor signal from the sensor reflecting a second parameter associated with a characteristic of the sub-component and determining whether the second parameter is acceptable based on the command. The control system may diagnose at least one of the elements of the work machine when the second parameter of the sub-component is not acceptable.

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What is claimed is: 1. A method for testing multiple elements of a work machine, including a control system, a component, a sub-component that is influenced by operations of the component, and a sensor that monitors a characteristic of the sub-component, the method performed by the control system c

What is claimed is: 1. A method for testing multiple elements of a work machine, including a control system, a component, a sub-component that is influenced by operations of the component, and a sensor that monitors a characteristic of the sub-component, the method performed by the control system comprising: sending a command to the component to adjust a first parameter associated with an operation of the component; detecting a sensor signal from the sensor reflecting a second parameter associated with a characteristic of the sub-component; determining whether the second parameter is acceptable based on the command; and diagnosing at least one of the elements of the work machine when the second parameter of the sub-component is not acceptable. 2. The method of claim 1, wherein the component adjusts the first parameter based on the received command and the sub-component operates in a manner that changes the second parameter from a first value to a second value based on the adjustment of the first parameter. 3. The method of claim 2, wherein determining further includes: determining whether the second value of the second parameter matches an expected value based on the command sent to the component. 4. The method of claim 2, wherein determining includes: determining whether the second value of the second parameter is within a predetermined range of an expected value based on the command sent to the first component. 5. The method of claim 4, further including: determining that the second parameter is unacceptable when the second value is not within the predetermined range of an expected value. 6. The method of claim 4, wherein diagnosing at least one of the elements of the work machine includes at least one of: performing a communication test between the control system and another element of the work machine; collecting first status information associated with the component; collecting second status information associated with the sensor; and collecting third status information from the sub-component. 7. The method of claim 6, wherein diagnosing at least one of the elements of the work machine further includes: identifying which of the elements may be associated with the second parameter being unacceptable based on the diagnosing. 8. The method of claim 6, wherein the first status information includes the first parameter. 9. The method of claim 6, wherein the first status information includes a parameter that is different from the first parameter. 10. The method of claim 6, wherein collecting third status information includes: collecting a third parameter associated with a second characteristic of the sub-component. 11. The method of claim 1, wherein the command includes a first portion and a second portion superimposed on the first portion. 12. The method of claim 11, wherein the second portion is a time-varying portion. 13. The method of claim 12, wherein the second portion has a frequency of between about 0.01 Hz and about 1.0 Hz. 14. The method of claim 12, wherein determining includes: determining whether the second parameter is responsive to the time-varying portion. 15. The method of claim 11, wherein the second portion has a magnitude less than about 15% of a magnitude of the first portion. 16. The method of claim 1, further including: generating a fault message based on the diagnosis of the at least one of the elements of the work machine. 17. The method of claim 16, further including: sending the fault message to an element included in the work machine. 18. The method of claim 16, further including: sending the fault message to an element external to the work machine. 19. The method of claim 16, wherein the fault message includes an identification of an element determined to be a possible cause of the second parameter being unacceptable. 20. The method of claim 1, wherein the component includes a motor that provides power to the sub-component. 21. The method of claim 1, wherein the sub-component is a pump system that receives power from the component. 22. The method of claim 1, wherein diagnosing at least one of the elements of the work machine includes: performing a software test on one or more programs executed by at least one of the control system and the component. 23. The method of claim 1, wherein diagnosing at least one of the elements of the work machine includes: diagnosing an element different from the component, sub-component, sensor, and control system; and determining whether the different element is affiliated with the second parameter of the sub-component being unacceptable. 24. The method of claim 1, wherein sending a command includes: periodically sending the command to the component. 25. The method of claim 1, wherein the control system is configured to provide the command on a data link of the work machine and evaluate an operation of at least one element in the work machine based on the command, the component is configured to perform a first operation for the work machine, receive the command, and adjust a first parameter associated with the first operation based on the command, and the sub-component is configured to perform a second operation for the work machine and adjust a second parameter associated with the second operation based on the first operation of the component, and wherein the control system uses the sensor signal to determine whether the second operation is being performed at an acceptable level. 26. A computer-readable medium including instructions for performing a method, when executed by a processing unit, for diagnosing one or more elements of a work machine, the method comprising: sending a command to the component to adjust a first parameter associated with an operation of the component; detecting a sensor signal from the sensor reflecting a second parameter associated with a characteristic of the sub-component; determining whether the second parameter is acceptable based on the command; and diagnosing at least one of the elements of the work machine when the second parameter of the sub-component is not acceptable. 27. The computer-readable medium of claim 26, wherein the command includes a first portion and a time-varying second portion superimposed on the first portion. 28. The computer-readable medium of claim 26, further including determining whether the second parameter is responsive to the time-varying second portion. 29. An apparatus for diagnosing one or more elements of a work machine, comprising: a processing unit; and a memory including: program code for performing a diagnosis process including the steps of: periodically sending commands to a component that adjusts the operation of the component, wherein at least one of the commands includes a first portion and a time-varying second portion superimposed on the first portion, receiving a sensor signal from a sensor monitoring a characteristic of a sub-component that operates in a manner based on the operation of the component, determining whether the characteristic of the sub-component is acceptable in relation to the operation of the component adjusted by the command, determining whether the characteristic is responsive to the time-varying second portion, diagnosing the one or more elements of the work machine when the characteristic of the sub-component is unacceptable, and determining whether any one of the one or more elements is a cause of the characteristic being unacceptable, wherein the one or more elements includes at least the component and sub-component.