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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > Check Engine

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Unread 01-15-2003, 05:13 PM   #1
Black96ZJ
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Join Date: Dec 2002
Location: Alpharetta, GA
Posts: 94
Check Engine

My Check Engine light came on today, what should I do? i heard that you can do something by twisting they key back and forth a few times to figure out what is wrong. i dont know what to do.PLEASE HELP ME.

Daniel

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Unread 01-16-2003, 11:17 AM   #2
automan25
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Join Date: Dec 2002
Location: Kenmore, WA
Posts: 290
I know you can read trouble codes by turning the key on and off in a certain sequence. Trouble codes are stored in the computer's memory whenever an electronic component on the car fails a test administered by the central computer (ECM?). These trouble codes will give you a starting point to determine what, if anything, is wrong with your vehicle. I'm not sure what the sequence is exactly, and you'd need a decoder list anyway for the codes that you read to make any sense. I believe the chilton manual that I bought for my ZJ has this list, as well as instructions for reading the codes from the ECM. I would recommend that you go to your local autoparts store and buy the Chilton manual for your vehicle. Typically they are around 25 dollars; and worth every penny. If you are really tight on funds, then you may be able to check out the Chilton manual from your local library.
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1993 ZJ Limited 5.2 - no mods - Red with Gold (what were they thinking) trim.
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Unread 01-16-2003, 11:49 AM   #3
wvit
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Join Date: Jan 2003
Location: South Carolina
Posts: 3
check out the website allpar.com, they have the list of codes and how to get them. You have to turn the key off and on three time quickley and then the codes will be displayed on the odometer. You will need the list of codes to know what they mean.
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