Detecting anomalies in fault code settings and enhancing service documents using analytical symptoms

A method for identifying a root cause of a fault in a serviced vehicle based on anomalies identified in parameter identification data and performing corrective actions, the method comprising the steps of:

• executing a diagnostic software routine for retrieving diagnostic trouble codes used to identify faults in an operation of the serviced vehicle;
• retrieving parameter identification data associated with the diagnostic trouble codes identified with a detected fault;
• collecting on a computer parameter identification data from a plurality of vehicles experiencing the diagnostic trouble codes;
• generating a first set of diagnostic rules, the first set of diagnostic rules identifying vehicle operating parameters for executing a diagnostic trouble code algorithm or for triggering a diagnostic trouble code;
• generating a second set of diagnostic rules, the second set of diagnostic rules identifying vehicle operating parameters used for selecting field failure data obtained when the diagnostic trouble code is triggered;
• extracting statistically significant rules from the second set of diagnostic rules;
• applying each of the first set of rules and the statistically significant rules cooperatively to the parameter identification data for identifying a subset of the parameter identification data that represents anomalies;
• a subject matter expert analyzing the anomalies for identifying a root cause of the fault;
• and
• performing corrective actions based on the identified root cause analysis.