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  1. #1
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    Default How to check OBD codes without a scanner

    Thanks again to Scott (XJ4IV) for bringing this to my attention. I had my check engine light come on during my drive home the other night, and was planning to take it up to the auto parts store the next day to have the codes read. Scott told me that Jeep made it possible on later models to read your trouble codes without using a scanner.

    Pre- 97 Jeeps can be read by putting the key in the ignition and turn the key to run (not start), then off, then run, then off, then run (that's 3 runs and 2 offs). Leave the key in the run position. The check engine light will turn on for a few seconds, then turn off, then (sometimes after 20-30 seconds) start flashing. The flashes are counting out 2-digit trouble codes. Fast flashes count up each digit, with a longer pause between digits. 55 indicates the end of all codes. Once you've got your code list, consult the list below to see what they mean.

    97+ I did the same procedure, but in addition to my check engine light flashing, my digital odometer flashed the 2 digit codes as well.




    In addition, here are some videos that show how to run these checks:

    96 and under

    [ame="http://www.youtube.com/watch?v=c6e1Q23pGd0"]jeep cherokee check engine light OBD1 - YouTube[/ame]

    97 and newer (video is of my test on my 97)

    [ame="http://www.youtube.com/watch?v=NYz-j-HMIjI"]Checking OBDII codes on '97+ Jeep Cherokee - YouTube[/ame]


    And another video showing how to test your instrument panel functions on a 97+. I don't know if this works on any other Jeeps.

    [ame="http://www.youtube.com/watch?v=mEeIuTWjdlg"]Jeep Cherokee Instrument Cluster Self Test Diagnosis - YouTube[/ame]
    Last edited by Brasscatz; 08-22-2012 at 07:58 PM.

  2. #2
    denverd1's Avatar
    denverd1 is offline Level: Uber Jeep Cherokee Trailer Queen
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    Default Re: How to check OBD codes without a scanner

    really cool!
    Wheelin' East Texas in a RED XJ

    RED 98 XJ with 4.5" lift, ZJ steering, front and rear locked on 33's
    cowl intake, Cobra CB, SYE, bumpers, 10K winch, lights
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  3. #3
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    Default Re: How to check OBD codes without a scanner

    Yeah I found this on a friend's 06LJ... and tried it on my XJ when the CEL came on one day, and I wasn't sure what was causing it.... I think that this is an awesome option... GM's had this option too from even back in the late 80's.... you just had to use a paper clip or wire to jump the diagnostic port to get the flashes on the CEL to get the code, but always thought it was an awesome design...
    FORMER GREEN XJ CLUB MEMBER
    IF YOU DON'T STAND BEHIND OUR TROOPS, FEEL FREE TO STAND IN FRONT OF THEM!!
    DOING SOMETHING JUST BECAUSE YOUR BUDDY DOES IT THAT WAY MAKES AS MUCH SENSE AS SHARING TOOTHBRUSHES

  4. #4
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    Default Re: How to check OBD codes without a scanner

    Wow I never knew you could do that! Thanks for the great information!
    If you're gonna wanna talk tough, I'll watch your eyes widen as I drop my Jeep on your hood like a Tonka Truck.

  5. #5
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    Default Re: How to check OBD codes without a scanner

    my obd2 scanner doesnt work on my 98 and the manual code checking doesnt worky.
    ooooooooh welllllllllllllllllllllllllllllll

  6. #6
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    Default Re: How to check OBD codes without a scanner

    Quote Originally Posted by Brasscatz View Post
    Thanks again to Scott (XJ4IV) for bringing this to my attention. I had my check engine light come on during my drive home the other night, and was planning to take it up to the auto parts store the next day to have the codes read. Scott told me that Jeep made it possible on later models to read your trouble codes without using a scanner.

    Pre- 97 Jeeps can be read by putting the key in the ignition and turn the key to run (not start), then off, then run, then off, then run (that's 3 runs and 2 offs). Leave the key in the run position. The check engine light will turn on for a few seconds, then turn off, then (sometimes after 20-30 seconds) start flashing. The flashes are counting out 2-digit trouble codes. Fast flashes count up each digit, with a longer pause between digits. 55 indicates the end of all codes. Once you've got your code list, consult the list below to see what they mean.

    97+ I did the same procedure, but in addition to my check engine light flashing, my digital odometer flashed the 2 digit codes as well.




    In addition, here are some videos that show how to run these checks:

    96 and under

    jeep cherokee check engine light OBD1 - YouTube

    97 and newer (video is of my test on my 97)

    Checking OBDII codes on '97+ Jeep Cherokee - YouTube


    And another video showing how to test your instrument panel functions on a 97+. I don't know if this works on any other Jeeps.

    Jeep Cherokee Instrument Cluster Self Test Diagnosis - YouTube
    Hi...

    It is not work with my XJ2001 on OBD check.
    Do u know other trick?

  7. #7
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    Default Re: How to check OBD codes without a scanner

    Quote Originally Posted by QatarXJ2001 View Post
    Hi...

    It is not work with my XJ2001 on OBD check.
    Do u know other trick?
    You will need a code reader for that year. You are from Qatar? You can get inexpensive blue tooth readers that will work with a free app for a cell phone that will read your codes
    230 hp 4.3L Chevy
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    And a bunch of other stuff

  8. #8
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    Default Re: How to check OBD codes without a scanner

    1996 XJ OBDII does use the Keydance method for the OBDI style codes. Anything OBDII you'll need the scanner.

    https://www.youtube.com/watch?v=PKLTzmmJuGs
    The Little Red Wagon in the theme of Overland Adventure Vehicle. Grab an empty seat and ride along here : http://www.xjtalk.com/showthread.php?t=19655

  9. #9
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    Default Re: How to check OBD codes without a scanner

    I have a 96 and use the key trick. it's kinda vague. a scanner get you more information. If you have a smart phone or a tablet this is the thing to get.
    [ame="http://www.amazon.com/Vgate-Bluetooth-Scanner-TORQUE-ANDROID/dp/B00AAOOQJC/ref=sr_1_9?ie=UTF8&qid=1446240375&sr=8-9&keywords=obd2"]Amazon.com: Vgate Bluetooth Scan Tool OBD2 OBDII Scanner for TORQUE APP ANDROID: Automotive@@AMEPARAM@@http://ecx.images-amazon.com/images/I/41JhRgXChpL.@@AMEPARAM@@41JhRgXChpL[/ame]
    One more part and I'll have a new Jeep

  10. #10
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    Default Re: How to check OBD codes without a scanner

    Quote Originally Posted by nickyg View Post
    I have a 96 and use the key trick. it's kinda vague. a scanner get you more information. If you have a smart phone or a tablet this is the thing to get.
    Amazon.com: Vgate Bluetooth Scan Tool OBD2 OBDII Scanner for TORQUE APP ANDROID: Automotive
    I agree, the MIL is a bit vague, but it will point in the right direction. I've got a Snapon Scanner here at the house that I use.
    The Little Red Wagon in the theme of Overland Adventure Vehicle. Grab an empty seat and ride along here : http://www.xjtalk.com/showthread.php?t=19655

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