Uploaded April 2026 | Updated September 2026, 3 weeks ago
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Duty Cycle Does NOT Always Mean Position
🔇 TAP TO UNMUTE
![I changed a part based on a code [what do you think happened?]](https://i.ytimg.com/vi/XMxi_ryoS0o/mqdefault.jpg "I changed a part based on a code [what do you think happened?]
In this part 2 of 2 series we address a downstream O2 heater circuit fault (new sensor) as well as revisit the fuel trim data where we find a problem
00:00 - link to part 1 https://youtu.be/KmXpyPbvPG0
01:51 - trouble codes P0036 P0054
02:23 - warning on downstream sensor location
03:25 - visual inspection of O2 harness
04:18 - wiring diagram for O2 heater circuit
05:17 - testing the circuit with a voltmeter
08:00 - wiring repair
09:46 - normal voltage and current measurements
13:00 - revisiting the fuel trim data from part 1
14:45 - miscalculated alcohol %
16:10 - fuel trims before reset
17:10 - purge valve strategy with misfire
18:14 - fuel trims after resetting alcohol %
18:47 - SD Premium https://www.scannerdanner.com/join-scannerdanner-premium.html
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![Chevy Corvette Cold Engine Misfire [Part 1]](https://i.ytimg.com/vi/XRk5LA2nFD0/mqdefault.jpg "Chevy Corvette Cold Engine Misfire [Part 1]
In this video we walk through some common steps to troubleshoot a misfire from basic fundamentals to lab scope diagnostics
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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.")
