Scope & Scan

  • 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. 
  • Do you go for the “fast fix,” or do the homework and go for a permanent one?
  • Fuel control plays an important part in the engine management system’s ability to deliver, control and keep emission levels at specification. 
  • The complaint on this 2001 Lincoln Town Car is that the car will not start. The shop stated that there wasn’t any communication with the Powertrain Control Module (PCM). 
  • There are many places that technicians might start their diagnosis when it comes to a misfire problem. I have a list of things that I suggest following to make your diagnosis fast and easy.
    David DeCoursey
  • The Digital Multimeter (DMM) and Digital Storage Oscilloscope (DSO) both can be used to measure voltage, but the way each displays that voltage reading, and what you can learn from it, is very different. 
  • Do you shy away from customers that come to you with a transmission complaint? Today, nearly everything on the car is electronically controlled, and the transmission is no exception.
  • You understand your tools, and have a general plan of attack. But every so often, you’ll find letters and numbers in places you don’t expect them. 
  • Case study No. 1 is a 2001 Mazda Protegé that had a bunch of transmission P07XX Diagnostic Trouble Codes (DTCs) and a problem with a hard shift.
  • Ever wish you could actually see if there was a restriction in a radiator or condenser? You can, if you use a thermal imaging camera.
  • The vehicle in question is a 2002 Chevrolet S-10 4WD with a 4.3L (vin X) engine. The customer complaint is a “Check Engine” light that is on steady and flashes while driving. 
  • Anything that negatively affects the combustion process will create a misfire. I refer to these negative effects as simply the three Ls.
  •   Even the folks at the top encounter problems every now and then. Leaders at TST this month share their experiences when diagnostics saved them in the bays.
  •   This month, I’ve got a few simple, but maybe not so obvious, tips to share with you. After that, TST member Ed Hazzard offers a few lessons learned working in the bays.
  • This month, TST members share some of their personal diagnostic stories. Consider the process they used to successfully complete the repair as you read them. How would you have approached these problems?
  • The problem vehicle that came in to the shop was a 2005 Ford Crown Victoria 4.6L V8 that had a complaint of being sometimes hard to start. 
  • Let’s start off this month with a few general tips before diving into a case study involving a 2007 Ford F150 VCT (Variable Cam Timing) problem.
  • In this month’s column, we take a look at suspension dos and don’ts, offer tips on running stubborn monitors and share a lesson learned by one of our TST members.