Fault templates are at the root of all of the features provided by the eXpress Maintenance Module. A fault template is an eXpress design element that represents the contents of a fault group that has been or can be isolated by the diagnostics. A fault template provides a way of assigning attribute values (e.g., fault codes or maintenance instructions) to isolated fault groups. Moreover, tests defined in terms of fault templates can be used to create secondary diagnostic procedures that extend the fault isolation achieved by primary diagnostics.
Because fault templates are saved as part of the eXpress design, and not in the diagnostic study, they can be reapplied each time that the diagnostics are calculated for that design.
The maintenance module can be used to automatically assign fault codes to the fault templates using rules based upon the set of fault codes that have been defined as available and the structure of the design.
Using fault template tests (i.e. tests defined from the fault templates), diagnostic knowledge of failures may be transferred from a primary diagnostic (e.g. diagnostics from automated test equipment or build-in-tests) and used as the set of starting conditions in a secondary diagnostic (e.g. manually performed troubleshooting diagnostics). This is accomplished by:
In addition to setting up fault templates and assigning fault codes, the maintenance manual supports the development of the IETMs by supplying all the information necessary to begin writing the repair and troubleshooting details of the IETM in a fault template report. The fault template report provides details about: