WTF? Check Engine Light is ON, shows no Codes!
01-21-2012, 12:17 PM
#16
CF Veteran
Join Date: Aug 2011
Location: Nor-Cal Coast
Posts: 10,489
Likes: 0
Received 17 Likes
on
17 Posts
Year: 90,84
Model: Cherokee
Engine: 4.0,2.5
1984-1990 w/AMC engine are pre-OBD.
1984-1986 w/GM V6-173 are OBD-I (GM control setup.)
1991-1995 are OBD-I (Chrysler)
1996-2001 are OBD-II (Chrysler)
The "Key Tricks"
Older (OBDI) models - Start with the ignition off. Within five seconds, switch the key on, off, on, off, on. ("On" is NOT "Start" and "Off" is NOT "Lock"). The "check engine" light will flash. Count the flashes. Each code is a two digit code, so a (for example) 23 would be FLASH FLASH (pause) FLASH FLASH FLASH (long pause). It will never flash more than 9 times, so watch for those pauses!
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, 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.
1984-1986 w/GM V6-173 are OBD-I (GM control setup.)
1991-1995 are OBD-I (Chrysler)
1996-2001 are OBD-II (Chrysler)
The "Key Tricks"
Older (OBDI) models - Start with the ignition off. Within five seconds, switch the key on, off, on, off, on. ("On" is NOT "Start" and "Off" is NOT "Lock"). The "check engine" light will flash. Count the flashes. Each code is a two digit code, so a (for example) 23 would be FLASH FLASH (pause) FLASH FLASH FLASH (long pause). It will never flash more than 9 times, so watch for those pauses!
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, 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.
01-22-2012, 02:47 PM
#17
Newbie
Thread Starter
Join Date: Jan 2012
Location: Richmond, KY
Posts: 25
Likes: 0
Received 1 Like
on
1 Post
Year: 1999
Model: Cherokee
Engine: 4.0 Litre, Inline 6
scroll down to middle and try that......http://go.jeep-xj.info/HowtoECUcodes.htm
The following users liked this post:
quititman (04-18-2020)
01-22-2012, 03:30 PM
#18
CF Veteran
Join Date: Sep 2009
Location: ☼ Blackhole Sun
Posts: 8,567
Likes: 0
Received 18 Likes
on
16 Posts
Year: My Jeep is a GMC
I don't see how any code could be read via the cluster self diagnostic, that's why we have OBD2 scan tools. Disconnecting the battery, waving a magic wand, or dancing the jig in your girlfriends underwear won't erase flash memory either. The only reason the light did not come on right away is it's not a hard fault.
01-22-2012, 03:45 PM
#19
Newbie
Thread Starter
Join Date: Jan 2012
Location: Richmond, KY
Posts: 25
Likes: 0
Received 1 Like
on
1 Post
Year: 1999
Model: Cherokee
Engine: 4.0 Litre, Inline 6
I don't see how any code could be read via the cluster self diagnostic, that's why we have OBD2 scan tools. Disconnecting the battery, waving a magic wand, or dancing the jig in your girlfriends underwear won't erase flash memory either. The only reason the light did not come on right away is it's not a hard fault.
01-22-2012, 03:50 PM
#20
CF Veteran
Join Date: Sep 2009
Location: ☼ Blackhole Sun
Posts: 8,567
Likes: 0
Received 18 Likes
on
16 Posts
Year: My Jeep is a GMC
You had apparently (2) stored codes when read @ autozone, you repaired the faults.
Those previous (2) codes though still stored (not erased) are no longer valid "No codes found".
Hope this makes sense, until the prior codes are properly erased the light will be on.
Those previous (2) codes though still stored (not erased) are no longer valid "No codes found".
Hope this makes sense, until the prior codes are properly erased the light will be on.
01-22-2012, 08:34 PM
#21
Newbie
Thread Starter
Join Date: Jan 2012
Location: Richmond, KY
Posts: 25
Likes: 0
Received 1 Like
on
1 Post
Year: 1999
Model: Cherokee
Engine: 4.0 Litre, Inline 6
That makes sense, but th A-Z guys said they could not delete any codes if it shows "No Codes FounD"... I'll take it back and have someone different do it...
01-22-2012, 09:34 PM
#22
Junior Member
Join Date: Jul 2009
Location: South Of San Antonio Tx.
Posts: 41
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1994
Model: Cherokee
Engine: 4.0
The A-Z guys cannot erase codes they can only check for the codes. You really need to go to a MECHANIC with a scan tool to have him or her (i'm not a sexist) clear the code for you. That is the best option (really the only choice) you have.
Last edited by Txssp; 01-22-2012 at 09:36 PM.
01-23-2012, 01:21 AM
#23
Newbie
Thread Starter
Join Date: Jan 2012
Location: Richmond, KY
Posts: 25
Likes: 0
Received 1 Like
on
1 Post
Year: 1999
Model: Cherokee
Engine: 4.0 Litre, Inline 6
Actually... The A-Z guys can erase codes, only problem is once the vehicle goes thru a couple times being driven the computer finds the error again...
01-23-2012, 01:38 AM
#24
Junior Member
Join Date: Jul 2011
Location: North Carolina
Posts: 95
Likes: 0
Received 0 Likes
on
0 Posts
Year: 1992
Model: Cherokee
Engine: 4.0
This is an incredibly stupid question, but I just have to ask...
Are you sure it's your check engine light, and not the maintenance required light? CEL would be for when codes come up, and MAINT should come on after however many miles, telling you you to get a tune up and stuff.
Had to ask.
Are you sure it's your check engine light, and not the maintenance required light? CEL would be for when codes come up, and MAINT should come on after however many miles, telling you you to get a tune up and stuff.
Had to ask.
01-23-2012, 02:31 AM
#25
CF Veteran
Join Date: Nov 2010
Location: some small town oregon
Posts: 15,581
Likes: 0
Received 8 Likes
on
8 Posts
Year: 1989
Model: Cherokee
Engine: 4.0
Originally Posted by BobIsAwesome
This is an incredibly stupid question, but I just have to ask...
Are you sure it's your check engine light, and not the maintenance required light? CEL would be for when codes come up, and MAINT should come on after however many miles, telling you you to get a tune up and stuff.
Had to ask.
Are you sure it's your check engine light, and not the maintenance required light? CEL would be for when codes come up, and MAINT should come on after however many miles, telling you you to get a tune up and stuff.
Had to ask.
01-23-2012, 10:52 AM
#26
Newbie
Thread Starter
Join Date: Jan 2012
Location: Richmond, KY
Posts: 25
Likes: 0
Received 1 Like
on
1 Post
Year: 1999
Model: Cherokee
Engine: 4.0 Litre, Inline 6
This is an incredibly stupid question, but I just have to ask...
Are you sure it's your check engine light, and not the maintenance required light? CEL would be for when codes come up, and MAINT should come on after however many miles, telling you you to get a tune up and stuff.
Had to ask.
Are you sure it's your check engine light, and not the maintenance required light? CEL would be for when codes come up, and MAINT should come on after however many miles, telling you you to get a tune up and stuff.
Had to ask.
Thread
Thread Starter
Forum
Replies
Last Post
Kevin Icenhour
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
2
08-21-2015 08:22 PM
CCKen
Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go here
3
08-20-2015 08:07 PM
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)