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  1. #1

    Default OBD II will not link, any suggestions?

    I recently acquired a 1997 LT Suburban, 5.7 L engine. After replacing the fuel filter, the Service Engine Soon lamp came on steady. I have a scan tool, but when I connect to the port, the screen remains blank and does not link (key is on, engine is off). I am familiar with using this tool, but I have not run into this problem of not communicating with the ecm. Any help would be appreciated. (BTW, I don't know if this is relevant, but the auxilary power oulets next to the cigar lighter have no power and yet all the fuses in both fuse boxes are good. Cigar lighter does have power. I can't explain that either.)

  2. #2


    my brothers 99 3/4 ton gmc sle has the same problem im going to be watching this one
    same here plug it in nothing...put it on another truck and itll read fine ......

  3. #3


    The data link connector has a power supply, and the usual reason for the scantool not to work like that is because the connector has no power. I believe it's the same fuse as the cigarette lighter, but not certain.

    For the OP, if you are certain all of the fuses are good, then it's time to find a wiring diagram and see if you have power to the diagnostic connector, and, if not, trace the wires to find out why.

    For werty, 1st check the fuses to see if they are ll good.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  4. #4


    IIRC, the power wire on the OBDII connector for late 90s, early 00s is orange. My uncle's dually that went through Katrina had a similar issue. The terminal for the power was corroded away. I pulled the pin from a junkyard OBDII connector, dropped it in its place in the connector on the truck, spliced it in and off I went.

    EDIT: checked the diagrams, and it is an orange line in the pin 16 spot. it's being fed off of aux power fuse #7 (25 amp it's listed as). Hope this helps.
    Last edited by Crawdaddy; 09-22-2008 at 05:47 PM.

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 265K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half

    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

  5. #5


    Thanks Crawdaddy and MrShorty, I rechecked my fuses and #7 was blown. Replaced fuse and scan tool linked up and my aux power outlets also powered up. As a newbi to the forum, I much appreciate the support from all of you!

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