Without this feature, you would basically have to start from square one. Most OBD scanners also set provisions to disable an illuminated check engine light should you choose to and provide real time test emission status which is a very important aspect in terms of your vehicles compliance in emission testing. Also note that any vehicle who has an illuminated engine check light would automatically fail any vehicle compliance test even if it just involves minor systems.
The chilton auto repair manual are constantly being revolutionized today and we can only expect to see more advanced features being integrated or introduced due to technological expansions and the development of more advanced interfaces. One good example is a mandatory interface system introduced way back 2008 in the United States which is called the CAN (Controlled are network). This interface is used to relay information throughout various modules that are connected to one another as a network in the on board diagnostics interface. The system as well as the chevrolet repair manual are all linked with the PCM (Power train control module) feeding it with specific constant real time data. The PCM then relays instructions to the power train system based on the information retrieved from the modules in doing a particular task, in what order it is to be done and how much output is required.