If you follow a manufacture flow chart when troubleshooting computer inputs and outputs, they almost always have you disconnect the computer and sensor to perform resistance measurements on the wiring to isolate the problem. This is a very time consuming process that can be completely bypassed with even better and more accurate results following my methods. In this video I will show you how to quickly and safely check the wiring, sensor and computer using scan data and a 5000 ohm resistor. An incandescent test light may be used as a substitute for the 5k ohm resistor.

Engine Performance Diagnostics chapter 10

test shown enh 50

  • how to quickly test sensor wiring (any 3 wire potentiometer or pressure sensor circuit on any car)

Tools used

  • 5k ohm resistor (incandescent test light may be used instead)
  • digital multimeter
  • scan tool
  • backprobing pins

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

Related videos:

Power Steering Pressure Sensor Test (P0550) - Toyota:


How to test a throttle position sensor (P0121, P0122) GM wiring integrity :


How to test TPS wiring with a scan tool (any car):


How to test an EGR DPFE sensor (EGR flow test) - Ford, Lincoln, Mercury :


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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!