On Feb. 20, the Automotive Service Association (ASA) hosted its monthly Webinar Wednesday.
The webinar featured well-known industry trainer “G” Jerry Truglia of Automotive Technicians Training Service, who presented “Why a DTC is Not Always Displayed.” Truglia covered how to alleviate issues related to a check engine light that comes on after the vehicle is repaired and how to diagnose and repair DTCs and drivebility more efficiently.
ASA Vice President Tony Molla began by welcoming attendees and introducing Truglia. Truglia began by examining the right way to diagnose DTCs and drivability problems. He noted that the most important tool needed to diagnose DTCs is a generic/global scan tool, but a factory scan tool is not always necessary.
He stated, “You’re not going to become an expert in an hour, but we can put some lights on and help each other.”
Repairers also need a game plan. Truglia explained, “Information on iATN, Identifix, ALLDATA, Mitchell, Autodata, MotoLogic, or even Google and YouTube can be very helpful in identifying if the vehicle you are working on needs a reflash or has a silver bullet problem. Remember, when looking at a silver bullet solution, always check and test the components and the system before replacing anything.”
As he began to explain how to understand the diagnostic process, Truglia noted, “Before we go too deep, let’s get the caveats out of the way. When it comes to diagnosing engine performance, DTCs or driveability problems use a general/global scan tool to expedite your diagnosis. A general/global OBD II scan tool allows us to view information quickly while allowing access to pending DTCs, Monitors, Mode 6, Mode 10 and Freeze Frame, to name a few. You won’t get all that information in the enhanced side of your scan tool, so start with the generic/global side first, and if you need more data PIDs or bi-directional control, switch to the enhanced side. Also, general/global PIDs are the same on every vehicle, whether it’s a GM, Toyota or a BMW. The data PIDs are all the same and easier to understand.”