This video applies to all Chrysler, Dodge and Jeep vehicle. Why is there 5 volts on an oxygen signal wire on a Chrysler? Is this normal or does this mean there is a problem? I will answer these questions in this video.

Engine Performance Diagnostics chapter 5 page 23

test shown enh 50

  • how to use the oxygen sensor bias voltage to determine oxygen sensor heater activity
  • how to check the signal wire for opens and shorts to ground using bias voltage
  • how to use your body as a resistor for testing the oxygen sensor circuit
  • why connecting a digital voltmeter will cause a drop in scan data signal voltage

Tools used

  • scan tool
  • lab scope
  • jumper wire
  • back-probing tools
  • digital multimeter

end faq

{accordionfaq faqid=accordion15 faqclass="dotluvfaq help2 aligncenter headerbackground headerborder contentbackground contentborder round7" active=item0}


(Chapters 4 and 5) Fuel Trim and Oxygen Sensor Testing

Related videos:

Engine runs rich P0172, P0175 from a blown O2 heater fuse (Jeep):


Oxygen sensor operation and testing (preview from ScannerDanner Premium):


Honda Oxygen Sensor quick tests (bias voltage):


end faq

{accordionfaq faqid=accordion3 faqclass="darkhivefaq defaulticon headerbackground headerborder contentbackground contentborder round5" active=item0}

For more information on this topic, I have written a “field manual” called Engine Performance Diagnostics which is available 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. 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!