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Reader Question: OBDII Protocols

I really enjoyed you article “Improve MPG: The Factors Affecting Fuel Efficiency”. I have a question for you that you might be able to answer. In your article you mentioned that there are different OBDII protocols (ISO, CAN, VPW…). Do you know which one the 2006 Jeep Wrangler is using?

According to the article:

  • PWM: Pins 2, 4, 5, 10 & 16
  • VPW: Pins 2, 4, 5 & 16 but NOT 10
  • ISO: Pins 4, 5, 7 & 16 with OPTIONAL 15
  • CAN: Pins 4, 5, 6, 14 & 16
    The 2006 Unlimited has pins 2, 4, 5, 7, 9, 12, 15 and 16. So it looks like it is very definitely a VPW / ISO protocol. I would recommend the ScanTool 5 and DigiMoto software that I used for the experiment because it is multi-protocol and will handle all four standards automatically. Plus, there is a variety of free (and commercial) software for it. Another very nice tool is made by AutoTap but it is very proprietary and they have the only software it works with.

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