In this video I am going to show you how to bypass a magnetic type crank sensor (VRS) and force an ignition coil to fire. On some systems, the coil will not fire due to design differences but you can still look for other responses. This is a great direction based test and will help you determine very quickly whether or not you have an input or output problem within the ignition system.

Engine Performance Diagnostics chapter 5 pages 11-22

symptoms 50

  • low power
  • runs good cold and at wide open throttle
  • hesitation on acceleration
  • rough idle
  • check engine light with O2 sensor heater codes

fix 50

  • replace blown fuse for the O2 heater

test shown enh 50

  • how to test an O2 sensor heater circuit
  • how to understand fuel trim
  • how to use scan data O2 bias voltage to determine O2 heater operation
  • how to test an O2 sensor signal with a scan tool

Tools used

  • scan tool
  • lab scope
  • test light
  • digital multimeter
  • pocket screwdriver

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

Related videos:

What can cause an O2 sensor to read near 5 volts? (Chrysler bias voltage) :


WARNING! Aftermarket Oxygen Sensors (Chrysler part 1):


WARNING! Aftermarket Oxygen Sensors (Chrysler part 2):


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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!