Join me and my entire class at Rosedale Technical College as we take a field trip to Latorre's Auto to troubleshoot some problem cars. This is one of four that we did together. One of them didn't make it on camera (broken timing belt on an Eclipse) and two other ones that did that are available on SD Premium.

This one is a 1994 Dodge Truck that has an intermittent stalling condition that was so severe it could not be driven. Every time the vehicle is moved, it shuts down. However, if you start it and just let it idle, it will run all day with no problems. Drop it into gear and try to move it and it shuts down again.

Engine Performance Diagnostics chapter 9

symptoms 50

  • intermittent stalling
  • no start
  • shuts down when the wheels/drive-shaft turns
  • multiple trouble codes related to vehicle speed sensor and transmission components

fix 50

  • repair short in the 8 volt supply to the vehicle speed sensor (rubbing on the front drive-shaft)

test shown enh 50

  • how a short on one sensor can take down an entire reference circuit
  • how to use customer complaints and symptoms to eliminate possible causes of a stalling condition
  • how to get trouble codes without a scan tool

Tools used

  • information database for wiring diagrams

end faq

Playlist

(Chapters 9, 10 and 11) The 5v Reference and Signal Circuit Quick Tests

Related videos:

No Start from a shorted MAP sensor (Honda, Acura):

1996 Jeep No Start Case Study Part I:

1996 Jeep No Start Case Study Part II:

How to check the 5v reference circuit for a short to ground (Cadillac):

end faq

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available as an eBook or paper book.

Want even more diagnostic training? Whether you are a DIY trying to fix your own car, someone looking to become an auto technician, or a current auto technician that wants to get more into diagnostics, subscribe to ScannerDanner Premium. There is a 14 day free trial.

On ScannerDanner Premium I will bring you right into my classroom at Rosedale Technical College. You will find page for page lectures taken right from my book as well as exclusive classroom type case studies. What is so special about these classroom case studies? I pull live problem vehicles directly into my classroom and we troubleshoot them in real time, using and applying the theory and testing procedures we learn during the classroom lectures. There is no better on-line training of how to troubleshoot automotive electrical and electronics systems anywhere!

 

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