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Unread 07-14-2006, 09:40 PM   #1
cody11ca
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Check engine light and ways to check codes

Is there a way to check the codes in the computer like you are able to do with a YJ? The reason i asked is my check engine light just came on in my 97 jeep grand cherrokee and it has 149,000 miles on it, ideas?

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Unread 07-14-2006, 09:42 PM   #2
anticrombie
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Turn the key on then off then on then off like 5 times and the odometer will display any codes.
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Unread 07-14-2006, 09:52 PM   #3
husker_zj
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does that work for a 93?
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Unread 07-14-2006, 10:11 PM   #4
rm2001wj
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Quote:
Originally Posted by cody11ca
Is there a way to check the codes in the computer like you are able to do with a YJ? The reason i asked is my check engine light just came on in my 97 jeep grand cherrokee and it has 149,000 miles on it, ideas?
Here's the procedure (doesn't work on '98 models): http://www.zjilla.com/tech_codes.htm.
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Unread 07-14-2006, 10:15 PM   #5
Meerkat
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Quote:
Originally Posted by husker_zj
does that work for a 93?
Yes, it does, except that the codes are read out by the number of flashes by the CEL, rather than by numerical display in the digital odometer.

Wow, we are posting in the future! Not too bad!
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Unread 07-14-2006, 10:51 PM   #6
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Autozone will read the codes for free - I'm sure that PepBoys does it too. Checker does as well. I have had probs in the past pulling codes from 97/98 GCs
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Unread 07-14-2006, 10:51 PM   #7
husker_zj
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Quote:
Originally Posted by Meerkat
Wow, we are posting in the future! Not too bad!
yea, pretty sweet huh
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Unread 07-14-2006, 10:58 PM   #8
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Quote:
Originally Posted by FPKites
Autozone will read the codes for free - I'm sure that PepBoys does it too. Checker does as well. I have had probs in the past pulling codes from 97/98 GCs

You can read a 98's codes with a scanner, just not with the on/off trick.
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Unread 07-15-2006, 01:51 AM   #9
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Extracting Fault Codes:
Turn the ignition switch ON, OFF, ON, OFF, ON and observe the CHECK ENGINE LIGHT. The CHECK ENGINE LIGHT should begin to flash a series of codes. The flashes will be separated by short and long pauses. The long pauses separate the "ones" and "tens" positions, and each code from the next. A code 55 will be displayed at the end of the test.

Here is another method that I found on the web
Extracting Fault Codes OBDII
Newer (OBDII) models - Put the key into the ignition, push down the odometer reset button, then turn the key to RUN with your finger on the button - and then release the button. The odometer will go through 1111111 through 999999, and then display the car's serial number. It will then show the error codes (it might show them starting with P). If this method does not work, try the OBDI method.
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Unread 01-11-2011, 08:23 PM   #10
webibeay
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Hey Folks -

I need a hand BAD! - I fried my transmission in my '98GK the day before Christmas. I had it rebuilt and all the sensors etc... replaced.

I got the truck back last night and it runs great, but my check engine light came on this eve... and I'm trying to figure out if it's something to-do with the tranny or did something else let go.

I did the key thing... and the lights flash once... pause, and then flash twice. What the hell does that mean????

UGH!

Bill
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Unread 01-11-2011, 08:33 PM   #11
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Just take it to autozone and ask them to run the code, the on off thing doesn't work on 98's.
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Unread 01-11-2011, 08:41 PM   #12
webibeay
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Really? I did the key thing... counted the blinks and checked against the website below.... is this not accurate?

http://www.allpar.com/fix/80s-codes.html
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Unread 01-11-2011, 09:04 PM   #13
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This has been discussed before. Most 98 model year ZJs cannot use the key trick. Your local chain auto parts store should be able to pull the codes for free.
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