Question about 1995 GMC Jimmy

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Own a 1995 gmc jimmy , service engine soon light is on and engine started running rough at idea. have actron cp9180 scantool but will not connect to computer in truck. Transition year from obd1 to obd 2 , truck has obd II connector and computer is on passeger side wheel well in engine compartment. Pins 2,3,4,9,13,16 have connection to the connector is there a way to read the trouble code without going to the dealership. Think egr valve maybe dirty or need replacement, 230k milege.

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  • rsparr9930 Aug 29, 2010

    No fuse blown , epa sticker on fan shroud states 1995 jimmy is obd I complaint, but I have a obd II plug to plug my scanner into to try to read a trouble code. Is there a fix for this? patch cable or adapter? Or do you do the paper clip trick and read two digit trouble code like obd I cars?

  • rsparr9930 Aug 31, 2010

    Went to autozone they had same cp9180 scanner it didn't link to the computer . called actron tech support, They said the cp9180 wouldn't read the codes. GM bastard years 1994-1995 said cp9145 would read codes and had proper cable? Looked at web page, not sure $460 ? Or Autoxray code reader around $200 plus special cable $50. Or just goto the dealer to scan it. Will have to check erg valve and see if it does the trick first. Old time mechanic work in computer age when computers where going to make fixing thing cheaper ,easyer,and less time consuming ya right! GM wake up,oh US taxpayers wake up,is this is why we own the company. people tired of the headaches even the small ones.

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  • Master
  • 749 Answers

Have you checked the fuses for the cigarette lighter or accessory port fuses? These are the ones that usually power up obd II devices and allow communication between the scanner and pcm. EGR on the 4.3 are a very common problem for catbon build up and if it is stuck open will cause rough idle. Check those fuses and let me know if scanner will communicate.

Posted on Aug 29, 2010

  • Jonathan S
    Jonathan S Aug 29, 2010

    Not that I am aware of on jumping the pins.I recently had a a 95 buick same issue but it did read the OBD II.Do you have another OBD II vehicle that you can plug into just to make sure the scanner is working ok and does your scanner have just the generic OBD II function? I have had a few that won't read codes unless you use the generic OBD II function. If an Autozone or Advanced auto is near run it over to them see if there code reader will codes or not.

  • Jonathan S
    Jonathan S Aug 31, 2010

    That doesn't surprise me. I know here they have a egr gasket available that has a screen instead of being open at the pintle.

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