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

Playlist

(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


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.

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