scope & scan

  • 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
  • First on the list this month is a 2003 Toyota Highlander 3.0L V6 that came in with a few Diagnostic Trouble Codes (DTCs), then comes a Porsche under water. 
  • 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. 
  • 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.
  • 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.
  • 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.