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CHAPTER 4 OXYGEN SENSORS AND FUEL TRIM PAGES 1 11

Topics covered

  • zirconia type narrow band O2 sensors
  • stoichiometric fuel control
  • when is the o2 sensor active/monitored
  • open loop vs closed loop
  • fuel map
  • sensor heating
  • switch rate, frequency and amplitude
  • sensor side wire colors
  • sensor location/designation
  • fuel trim
 

CHAPTER 4 OXYGEN SENSORS AND FUEL TRIM PAGES 12 21

There have been some title changes to the videos referenced in this lecture. The new titles and the links can be found under "Related videos".

Topics covered

  • fuel trim numbers at different loads
  • vacuum leaks vs fuel delivery problems
  • difference between "condition" and "command" (fuel trim)
  • using freeze frame data to determine type of lean condition
  • OBD II readiness monitors (P1000 trouble code)
  • importance of documenting your repair order
  • how to handle multiple trouble code vehicles
  • how to ID a low fuel pressure problem
  • effects of a dirty MAF sensor on fuel trim
  • sensor side vs harness side wire colors
  • dirty MAF may cause a rich condition at idle
  • AIR system check using O2 sensor data
  • EGR flow testing using the O2 sensor and fuel trim
  • how a stuck open EGR valve can cause a lean condition
 

CHAPTER 4 OXYGEN SENSORS AND FUEL TRIM PG 20 EXPANDED CONTENT

Topics covered

  • classroom review of my "Stuck open EGR on a MAF engine (causing lean conditions) video
  • effects of EGR flow on fuel trim
 

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