Use this test to quickly and accurately check the O2 sensor signal wire for an open or short to ground or verify a shorted O2 sensor. A manufacturer flow chart will have you disconnect the O2, disconnect the engine computer (ECU, ECM, PCM) and then measure the signal wire for opens and shorts with an ohmmeter. Using the "bias voltage" test I am showing in this video, you can perform the same tests in a fraction of the time.
"Bias voltage" on a circuit can be difficult to understand from an engineering standpoint but it is super easy to use when you know it is there.

Tools used:
- labscope
- digital multimeter
- backprobing pin

Related videos:
- How to quickly test an oxygen sensor circuit (GM bias voltage)
[ Ссылка ]
- What can cause an O2 sensor to read near 5 volts?
[ Ссылка ]
- O2 sensor circuit testing (a ScannerDanner Premium video)
[ Ссылка ]
- WARNING! Aftermarket Oxygen Sensors (Chrysler part 1)
[ Ссылка ]
- WARNING! Aftermarket Oxygen Sensors (Chrysler part 2)
[ Ссылка ]



Playlist:
- [ Ссылка ]

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available at www.scannerdanner.com 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 [ Ссылка ] 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!

Disclaimer:
Due to factors beyond the control of ScannerDanner LLC, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. ScannerDanner LLC assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. ScannerDanner LLC recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of ScannerDanner LLC, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not ScannerDanner LLC.

свернуть