As you are working on today’s vehicles you won’t be able to fix many different vehicle problems unless you are able to reprogram the vehicle. Our case in point is a 2006 Ford Explorer with a 4.6L V8 (Figure 1) that came in the shop with an EVAP circuit and O2 heater circuit problem.
The TST/ATTS training center is also a full-time shop located north of New York City and its keeps me current on the problems my students and readers are facing. Here are a few of the recent challenges we faced.
With young techs working in my shop, I find myself spending as much time in the bays with them as I do upstairs working on my training materials. While it makes for long hours and hectic days, it also keeps my own diagnostic skills sharp, and I enjoy passing on what I’ve learned to the guys.
Toyota EVAP Fault First
First up is a Toyota Avalon (even though the Toyota Scan tool ID’d th
This problem vehicle was a 2005 Ford Crown Victoria 4.6L V8 with a complaint of sometimes being hard to start. The retired owner of this Ford does not drive it much. In fact, this vehicle only had 25,000 miles on the clock.
The customer came in with a complaint that his Check Engine light was on. A quick scan easily showed the reason for the complaint. A P0401 (Exhaust Gas Recirculation (EGR) Insufficient Flow) code was found when I checked using Global OBDII’s Mode $03.
Vacuum leaks and fuel delivery problems are common causes for these common codes, and you might be tempted to focus immediately on these. But there are many other causes that can illuminate the MIL for the P0171 and P0174 DTCs that you also need to consider.
New DTCs appearing after a repair is more common than you might think. The reasons why are several, but the most common are a failure to make sure all the OBDII test monitors are Ready, failure to address pending Diagnostic Trouble Codes (DTCs), and not investigating the cause of Mode $06 failed test results.
In our first case study we are using the Toyota Techstream OE factory scan tool on a 2005 Scion tC. Let’s take a look at one of the most important pieces of scan data that many of us overlook, monitor information.
A few comebacks are caused by faulty parts or an honest mistake made during the repair process. But many are the result of basic flaws in the diagnostic process, made in the very beginning that doomed the repair from the start.
Aftermarket professionals working toward additional certifications through professional organizations can get one step closer to their goals by attending the free one-day Commitment to Training event at Washtenaw Community College in May.
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