How to simulate a rich & lean O2 signal (PCM response testing)

How to quickly test an O2 sensor signal wire for opens and shorts when no scan data is available. This test is very useful in identifying wiring harness integrity when you have an oxygen sensor signal that is either fixed high or low. You can actually use your body as a resistor instead of a test light if that makes you more comfortable. Engine Performance Diagnostics chapter 5 page 23 Tests shown - how to simulate a lean oxygen sensor signal - how to simulate a rich oxygen sensor signal Tools used - test light - back-probing pins - lab scope - digital multimeter Playlist - (Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing https://www.youtube.com/playlist?list=PLD2809EEC7BAAF989 Related videos - O2 Sensor wiring quick tests (Ford with no bias voltage) https://youtu.be/djyyKlIVeMI - O2 sensor testing (fixed lean) P0174, P0154, P0155 - Mitsubishi https://youtu.be/2VW78LKAQYY - Ford O2 Sensor Testing https://youtu.be/PYFQ3Y4eFWY 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! 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.