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If you have a scanner and have an interest in delving deep into the vehicle computer(s) then you only have half the story. You also need the information to go with it and that is what you are pointing out. The Best solution is to get the Factory Service Manual which will give you the descriptions of the PIDs and what should be the nominal values. A FSM is very expensive and in some cases hard to get so a better idea is get a Short lenght subscription to ALLdata DIY and if you like it then sign up for longer. Most of the Data is from the FSM. Stay far away from Haynes as they are rubbish, Chiltons is not as bad but like Haynes covers too many vehicles and does not really get into the Diagnostic side of things. Good luck on your quest
 
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