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What is a vehicle diagnosis?

One of the most difficult jobs a technician has is diagnosing check engine lights or a vehicle that is not running or driving the way it was designed to.

Modern cars are very complicated, with many complex systems, and most often require a computer or scanner for proper communication to diagnose. Our technicians at Poway’s Accurate Automotive are highly trained and fully equipped to handle these situations.

The first step to proper diagnosis is to verify the concern. This usually involves a proper interview with the client to find out how and when the vehicle is acting up, and then have the technician be able to reproduce the symptom with the vehicle. 

The next step is to check for any DTC’s (diagnostic trouble codes) and perform a full vehicle scan. This will check all of the control modules for possible clues (not just the module that is having the problem).

The next step is finding the proper resources and then testing the vehicle, which often includes hooking up test equipment and monitoring the system in question while it is malfunctioning. 

One of the most important pieces of this puzzle is verifying the repair after completion, which is one of the many things that separate our master technicians from the competition.

Many vehicles have “redness monitors” that let the computer know that the system is fully functional. The technician will often attempt to set these monitors, or at least perform a system test to verify the repair before the vehicle is delivered back to the client, to ensure the repair was successful and that the vehicle is operating as designed.

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