Wideband O2 sensor testing, P1130 (Lexus RX-300) - Part 2

توضیحات:

Here’s part II of my wideband O2 case study. I cover some further voltage and current testing on this vehicle and go deeper into the operation of this type of wideband sensor. While we found that the low amp probe won’t work in this application, we did find that some of our ‘normal’ zirconia O2 sensor tests carry over, and are still effective during diagnostics. I also got to review some fuel trim analysis and MAF cleaning as a final fix on this vehicle.

Engine Performance Diagnostics chapter 5

Symptoms
- pending trouble codes (P0171, P1130)
- intermittent rough idle

Fix
- replaced the bank one upstream wideband O2 sensor
- cleaned the MAF sensor

Tests shown
- using a low amp probe to attempt to measure wideband O2 current changes
- comparing operating voltages of wideband O2’s to normal zirconia O2’s
- how to use fuel trim to recheck for further issues after a repair
- visually checking and cleaning an analog MAF sensor

Tools used
- lab scope
- scan tool
- low amp probe
- pocket screwdriver

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

Related videos
- Wideband O2 sensor testing, P1130 (Lexus RX-300)
https://youtu.be/7Xm2rYQXT8s
- How to identify and clean a dirty MAF sensor (Subaru)
https://youtu.be/QwGICKqWgM4
- STFT reads opposite of LTFT (after repair fuel trim data)
https://youtu.be/zYjj8QO5OyI
- 2014 Subaru WRX O2 Heater Test (P0037, P0141)
https://youtu.be/FaTGowykJYc

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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