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New to Code Readers Question 850 1997

posted by  Torque on  Wed Sep 5 03:24 CST 2007
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last visit: Fri Aug 1 10:12 CST 2014
[RELATED]

I had a check engine light. I disconnected the battery to clear. Light hasn't come back (yet). I bought the Innova 3030 from Walmart. It shows Zero codes, but indicates yellow "Pending Code Present" meaning "Monitors on vehicle not finished self-testing", yet it never does seem to finish self testing, it just cycles through and the flashing "HC" "EV" "2A" "O" and "OH" indicate that those monitors aren't finished.

Questions:
1. How long do you need to keep it plugged in? Will it ever finish self testing those other systems?

2. This reader was $49. Will the other $98 one do any better?

Thanks!
--
1993 240 Classic; 1992 240; 1997 850 GLT; Mitsubishi 4 cyl.








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    New to Code Readers Question 850 1997

    posted by  david hunter on  Wed Sep 5 03:55 CST 2007
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    last visit: Mon Jun 30 22:10 CST 2014
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    On an OBD2 system I am surprised that disconnecting the battery turned off the Check engine light and cleared the fault code. You may have done that with your reader. After codes are cleared there is some monitoring and testing that the ECU must perform before everything is truly "clear". This can be done only by driving the car for a few trips to allow that testing to be completed. It has nothing to do with having the the reader connected.

    The purpose of this self testing and monitoring of sensors is to prevent someone from clearing the codes and rushing off to the testing station. It will fail until self testing is complete.

    Check it again in a few days.
    --
    David Hunter








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      Thanks but... 850 1997

      posted by  Torque on  Wed Sep 5 04:27 CST 2007
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      last visit: Fri Aug 1 10:12 CST 2014
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      Thanks for the reply. I know what you mean about the reader clearing the codes but I cleared the "check engine light" last night via battery disconnect and bought the reader today.

      I guess my question is more of a Code Reader unit question. It seems to just keep searching for info from the car and I was wondering if a more expensive reader would retrieve that info better. I will continue to drive to see what comes back but I am still uncertain if my reader suffices.

      Thanks,
      T
      --
      1993 240 Classic; 1992 240; 1997 850 GLT; Mitsubishi 4 cyl.








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        Thanks but... 850 1997

        posted by  KlausC on  Wed Sep 5 05:02 CST 2007
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        last visit: Fri Oct 24 10:15 CST 2014
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        It is not your elcheapo code reader that has a problem. The ECU lost all of its memory when you disconnected the battery, now you need to go through the drive cycle so that the ECU can self diagnose the engine.
        This drive cycle is quite elaborate, varying speeds and temps, and may take several weeks of normal driving. A single long trip will not suffice.

        Keep your code reader and next time you get a CEL or change the oil, use it to read all of the codes, deleting those which show up. Assuming you fix any problems, of course.

        Klaus
        --
        Please answer, we need to know if the advice is good or bad. The 164 has a new home, all I am left with are 2 turbos :)








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          Thanks but... 850 1997

          posted by  Moregolf on  Wed Sep 5 06:10 CST 2007
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          last visit: Tue Apr 22 07:55 CST 2008
          [RELATED]

          Aren't there default settings that the computer starts to use after disconnecting the battery? I was under the assumption that there are factory defaults.








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            Thanks but... 850 1997

            posted by  KlausC on  Wed Sep 5 07:15 CST 2007
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            last visit: Fri Oct 24 10:15 CST 2014
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            There are some, but all 850s are not created equal. The California smog guys have real issues with the 1996 ECU. I am not so sure with the 1997 ECU. But the ECUs are progressive learners, and while they are "learning" there are open codes.

            Klaus
            --
            Please answer, we need to know if the advice is good or bad. The 164 has a new home, all I am left with are 2 turbos :)







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