Showing posts with label DTC. Show all posts
Showing posts with label DTC. Show all posts

Saturday, October 22, 2011

Understanding OBD II on My Vehicle

DTC Anatomy



Types of DTC's

There are two categories of DTC's that apply to OBDII. They are listed below with Type A being the more severe.
Type A

  1. Emissions related.
  2. Requests illumination of the MIL after one failed driving cycle.
  3. Stores a freeze frame DTC after one failed driving cycle.


Type B

  1. Emissions related.
  2. Sets a Pending Trouble Code after one failed driving cycle.
  3. Clears a Pending Trouble Code after one successful driving cycle.
  4. Turns on the MIL after two consecutive failed driving cycles.
  5. Stores a freeze frame after two consecutive failed driving cycles.



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