Ford O2 Sensor Testing - wiring tests (no bias voltage)

During this case study, I use this Ford as an opportunity to cover my O2 sensor circuit integrity test in great depth. I not only explain its value during diagnostics, but also try to address any concerns or questions you may have as far as any potential to harm a computer. We also get to see the interesting backup strategy employed by Ford for O2 sensor issues, and how this can potentially mislead you if you’re not aware of it.

Engine Performance Diagnostics chapter 5

Symptoms
- check engine light (P1000, P1131)

Fix
- replaced the bank 1 sensor 1 O2 sensor

Tests shown
- using scan data (O2 signal and fuel trims) to evaluate O2 sensor performance
- how to recognize closed loop operation using only short term fuel trims
- understanding how a trouble code can change closed loop operation on some vehicles
- how to configure data lists on a Snap-On Solus Pro
- understanding Ford Keep Alive Memory (KAM) and why it’s important
- how to use propane to check for a lean condition or a sensor problem
- how to check for a bias voltage on an O2 signal circuit
- using sensor-side O2 wire colors to identify signal and heater circuits without a diagram
- how to perform an O2 signal circuit integrity test
- understanding why having the sensor plugged in or unplugged is important
- understanding current and voltage levels during the O2 signal circuit integrity test

Tools used
- scan tool
- propane
- incandescent test light
- digital multimeter

Playlist
- (Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing
https://www.youtube.com/playlist?list=PLD2809EEC7BAAF989

Related videos
- Ford 4-wire MAF sensor wiring tests (integrity testing)
https://youtu.be/ejh_ZCntFkE
- How to identify a bad oxygen sensor (signal fixed rich)
https://youtu.be/ClCuoi3JxEI
- What is Oxygen Sensor Bias Voltage? (an SD Premium video)
https://youtu.be/4N40lBnA8sI
- How to quickly test an oxygen sensor circuit (GM bias voltage)
https://youtu.be/adkFTSoxM6Q
- O2 sensor testing (fixed lean) P0174, P0154, P0155 - Mitsubishi
https://youtu.be/2VW78LKAQYY

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 https://www.scannerdanner.com/join-scannerdanner-premium.html 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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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.

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