Help. Check engine light on but no codes stored - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > Help. Check engine light on but no codes stored

FS: Jeep Fog Light LED Bulbs! Several Brightness Options! Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineOld Man Emu WK Lift - Black Friday Special!!

Reply
Unread 11-03-2010, 06:24 AM   #1
WhatBump1
Registered User
1997 TJ Wrangler 
 
Join Date: May 2009
Location: Tomkins Cove, NY, NY
Posts: 380
Help. Check engine light on but no codes stored

WTF....Check engine light on , but no code....I stopped at a shop, just to make sure my computer worked, the check engine light stays on, no codes, what is going on
and stumped

__________________
97 TJ Pearl Blue I6, 5 spd,
85 CJ7 Laredo 4.2 with HEI fuel Injection (project)

BMW Z4 M Coupe to Jeep TJ to Jeep CJ7 to BMW R1200C
WhatBump1 is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 06:59 AM   #2
nikeo02
Registered User
2003 TJ Wrangler 
 
Join Date: Mar 2010
Location: Mount Holly, NJ
Posts: 116
That cannot happen, by definition. But if you are having this error, a common cause is a misfire. Misfire codes can disappear after some time without a misfire. The light should go off in turn though. If they cant clear it with the scanner, i would try a "hard clear" by disconnecting power for a while. Good luck.
__________________
2003 Yellow TJ
nikeo02 is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 10:25 AM   #3
WhatBump1
Registered User
1997 TJ Wrangler 
 
Join Date: May 2009
Location: Tomkins Cove, NY, NY
Posts: 380
Quote:
Originally Posted by nikeo02 View Post
That cannot happen, by definition. But if you are having this error, a common cause is a misfire. Misfire codes can disappear after some time without a misfire. The light should go off in turn though. If they cant clear it with the scanner, i would try a "hard clear" by disconnecting power for a while. Good luck.
tried that ... did not work either..? now i am really stumped
__________________
97 TJ Pearl Blue I6, 5 spd,
85 CJ7 Laredo 4.2 with HEI fuel Injection (project)

BMW Z4 M Coupe to Jeep TJ to Jeep CJ7 to BMW R1200C
WhatBump1 is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 10:55 AM   #4
YellowX
Registered User
1999 TJ Wrangler 
 
Join Date: Aug 2002
Location: Weare, NH
Posts: 669
Is your CEL on or "Check Gauges" light?
__________________
Fred

JAFGJ
YellowX is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 10:57 AM   #5
WhatBump1
Registered User
1997 TJ Wrangler 
 
Join Date: May 2009
Location: Tomkins Cove, NY, NY
Posts: 380
nope

only the Check engine, and I stopped allready at 2 shops and their comps say no code
????
__________________
97 TJ Pearl Blue I6, 5 spd,
85 CJ7 Laredo 4.2 with HEI fuel Injection (project)

BMW Z4 M Coupe to Jeep TJ to Jeep CJ7 to BMW R1200C
WhatBump1 is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 11:01 AM   #6
biffgnar
Web Wheeler
 
biffgnar's Avatar
2006 TJ Wrangler 
 
Join Date: May 2008
Location: Westchester, NY
Posts: 14,169
Loose wire somewhere getting power to that bulb?
__________________
Thank you Dave Cole, Dynomax, Falken and all the Spec Class sponsors!!
biffgnar is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 11:40 AM   #7
fishinjeeper
Registered User
2001 TJ Wrangler 
 
Join Date: Aug 2009
Location: around
Posts: 2,888
Quote:
Originally Posted by biffgnar View Post
Loose wire somewhere getting power to that bulb?
x2
__________________
[CENTER]01 TJ. 35 inch KM2's. 4.5 RE. 2 inch body lift. dana 44. Detroit Locker. Olive Drab!! all set for trout and bambi![/CENTER]
fishinjeeper is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 01:59 PM   #8
Jonny Jeep
Web Wheeler
 
Jonny Jeep's Avatar
1997 TJ Wrangler 
 
Join Date: Feb 2007
Location: Manchester, UK
Posts: 4,764
Possibly a bad connection to the OBDII port or no power to it. Power is from the same fuse that supplies the courtesy lamps so if they are OK the connector should have power. Did you know that on a 97 you can get two digit codes from the cluster...?

http://www.jeepforum.com/forum/f9/fa...-codes-778086/
__________________
"Giving English to an American is like giving sex to a child. He knows it's important but he doesn't know what to do with it."
Adam Cooper (19th century)

Rockauto 5% discount code can be found here... http://www.markviii.org/LOD2/products_services.htm

Online factory service manuals (FSMs) and parts lists can be viewed at http://www.jeep4x4center.com/knowledge-base/index.htm
If the link doesn't work properly, look for the service manual link under Jeep Resources at the bottom of the page.
Jonny Jeep is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 02:23 PM   #9
Wheelin98TJ
JEEP FREAK
 
Wheelin98TJ's Avatar
1998 TJ Wrangler 
 
Join Date: Apr 2004
Location: , Southeast MI
Posts: 24,779
I edited your thread title.

"Help" is a little vague.
Wheelin98TJ is online now   Reply With Quote Quick reply to this message
Unread 11-03-2010, 02:25 PM   #10
smotrs
Registered User
1998 TJ Wrangler 
 
Join Date: Aug 2010
Location: So. California
Posts: 410
Gas cap tight? Can't recall if there's a code when the gas cap is too loose.
smotrs is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 02:28 PM   #11
WhatBump1
Registered User
1997 TJ Wrangler 
 
Join Date: May 2009
Location: Tomkins Cove, NY, NY
Posts: 380
Quote:
Originally Posted by Wheelin98TJ View Post
I edited your thread title.

"Help" is a little vague.
Thats all I could think of, finally got the TJ running perfectly so if there is no code is nothing wrong, or is there no code because there is nothing wrong except a bad connection, or ...? driving me nuts...
I should be working on my CJ7 resto.
__________________
97 TJ Pearl Blue I6, 5 spd,
85 CJ7 Laredo 4.2 with HEI fuel Injection (project)

BMW Z4 M Coupe to Jeep TJ to Jeep CJ7 to BMW R1200C
WhatBump1 is offline   Reply With Quote Quick reply to this message
Unread 11-03-2010, 02:36 PM   #12
MikeyJ
Registered User
2000 TJ Wrangler 
 
Join Date: Jan 2009
Location: Colorado Springs
Posts: 577
Unplug battery terminal cables and touch them together for 5+ minutes... Reconnect and see if light goes away.
MikeyJ is offline   Reply With Quote Quick reply to this message
Unread 11-04-2010, 10:16 AM   #13
WhatBump1
Registered User
1997 TJ Wrangler 
 
Join Date: May 2009
Location: Tomkins Cove, NY, NY
Posts: 380
Quote:
Originally Posted by MikeyJ View Post
Unplug battery terminal cables and touch them together for 5+ minutes... Reconnect and see if light goes away.
did that ...still the same
__________________
97 TJ Pearl Blue I6, 5 spd,
85 CJ7 Laredo 4.2 with HEI fuel Injection (project)

BMW Z4 M Coupe to Jeep TJ to Jeep CJ7 to BMW R1200C
WhatBump1 is offline   Reply With Quote Quick reply to this message
Unread 11-04-2010, 08:36 PM   #14
TJJP77
Registered User
2002 TJ Wrangler 
 
Join Date: Sep 2005
Location: Somewhere, MI
Posts: 1,810
It could be a failed OBDII monitor "readiness"...I'm not sure these leave a code, but a good code scanner will have a mode to check OBDII monitor status and it will tell you which ones have failed.
__________________
Chris
'02 Sahara
'06 Rubicon Unlimited
Sienna Jeep Club: Member #15
TJJP77 is offline   Reply With Quote Quick reply to this message
Unread 11-04-2010, 08:48 PM   #15
hefightsfire
Registered User
2001 TJ Wrangler 
 
Join Date: Oct 2010
Location: Decatur, Alabama
Posts: 233
Quote:
Originally Posted by smotrs View Post
Gas cap tight? Can't recall if there's a code when the gas cap is too loose.
It does leave a code but this can't be it. In order for the gas cap to throw the code it takes a while and his light has been coming right back on after having been reset.
hefightsfire is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.


Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.