Question about Jeep Grand Cherokee

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95 Jeep Grand Cherokee 5.2 V8 Check engine light came on last week. Found that number six fuel injector not working. Noticed that harness to injector had been almost cut thru due to heater hose rubbing on it. Repaired the harness, but still no voltage coming thru harness to injector number six. I tested injector and it is working. I am thinking pcm was damaged when harness was cut thru. Please help. Code number 27 comes from computor.

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  • pianosdude Jun 17, 2009

    Hello and thank you for the advice. I checked all eight injectors by unplugging one at a time. All function except number six. Used continuity tester to track wires from injector to pcm. All good. Voltage at other seven connectors.



    I have a factory installed alarm, so I am concerned about what you said about used computors. Does this apply to computors that have been rebuilt and updated?



    Thanks.



    Herb

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Hi,

Code 27 indicates a badinjector(s) OR a bad computer if you are VERY technicaly involved youneed to get a service manual and follow the code to its end if not thenyou need a pro to take over. first you need to identify whichcylinder(s) are misfiring the SAFEST way for a novice is to disconnecteach injector wire 1 at a time with the engine running and whichevercylinder(s) don't cause the rpm's to drop are misfiring cylinders thenyou need a "noid" light for your particular injector connector, thereare several types and are available at most larger autoparts stores youSHOULD have a bosch style connector, install the noid light in the harness at the injectorend and watch the light it should blink rapidly if it dosen't blinkthen you need to check the wiring with an ohm meter (digital only) for shorts and/or open circuits from the engine computer to the injector(s) if they are ok then the engine computer is at fault do not use a used computeras many jeeps had factory alarms and that once activated is stored inthe engine computer and CANNOT be deactivated. if you are notcomfortable working around the computer and cannot get a service manualthen goto a pro it will cost you less in the long run.

If you wish, you can buy a cost effective repair manual :-

http://www.themotorbookstore.com/jeepgrancher.html

Thanks for using "Fixya".

Posted on Jun 17, 2009

  • taran_2005
    taran_2005 Jun 17, 2009

    Hi,


    Code 27 is more difficult
    it means the computer isn't seeing the injectors pulse this is USUALLY
    a bad computer but connectors on any injectors that are marginal OR a
    bad injector (your guess is as good as any as this was a VERY simple
    computer and only looks at all the injectors at the same time) this
    code may be best left to a pro (a good jeep tech).
    Any further help, let me know.

    Thanks.

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