How does one reset the check engine light?

JrRifleCoach · 11-19-2009, 10:30 PM

I read somewhere that you can switch on/off 50 times to put out the light.

Will this really work? Or just wear out the switch prematurely?

The Black · 11-19-2009, 10:38 PM

Try disconnecting the pos. bat cable and touch it to the engine block for 30sec. But I am thinking it will throw a code again later. Codes are started over after 50 starts, I believe.

sv41878 · 11-19-2009, 11:16 PM

Almost any parts store has a code reader as a loaner, just borrow it for 5 minutes to read and reset the codes and fix the issue before it turns on again.

Dwinthrup · 11-20-2009, 01:00 AM

Quote:

Originally Posted by sv41878

Almost any parts store has a code reader as a loaner, just borrow it for 5 minutes to read and reset the codes and fix the issue before it turns on again.

True story, I've used said scanner to do my cars then I just bought one. Also I've heard to never ever ever touch the pos and neg terminals together, something about frying compacters off the pcm.

sv41878 · 11-20-2009, 09:46 AM

Yeah connecting + and - is a bad idea, sometime you can reset the PCM by pulling the fuse with the ignition on and leaving it out for 10 seconds, but a code scanner is the best way to go, then you know why it threw a code too.

4wheeldrivenewbie · 11-20-2009, 01:06 PM

disconnect the negative battery terminal for 10 mins then reconnect start a couple of times over the course of the day till the computer readjusts it self

CherokeeMan96 · 11-20-2009, 01:57 PM

ive just disconnected the battery, say...half an hour. u know, disconnected it, went in the house had lunch n came back, it dumps the code memory, but if its a persistant prob itll come back...thats when that code reader from autozone comes in handy

cj11 · 11-20-2009, 03:52 PM

I have used the + and the - for 30 seconds on many vehicles and never had a computer problem works every time

krkx93 · 11-20-2009, 06:04 PM

depending on what year you have... 96 and older after youve fixed the problem causing it to turn on the light will turn off after 50 key on/off cylces. heres a link on how to read the codes and what not http://go.jeep-xj.info/HowtoECUcodes.htm

xj4life2 · 11-20-2009, 08:03 PM

to clear codes disconnect the battery for thirty sec's to reset the ecm disconnect the neg and pos leads and touch them together.

sv41878 · 11-20-2009, 08:22 PM

I'll buy the story about touching the 2 together AFTER they have been disconnected, I had a blazer that the codes cleared when I pulled the computer fuse. I say just go to the parts store. And yeah I know from experience that 96's will clear the codes on their own, mine does it instantly (had an issue with the temp sensor for the aux fan being disconnected while I was trying to figure out a gauge issue).

krkx93 · 11-20-2009, 11:40 PM

yea but if you disconect the battery then itll read a code 12

Dwinthrup · 11-20-2009, 11:52 PM

OBD1 only need to disconnect the battery or pull the fuse and push and hold the brake pedel for 20 sec or so to discharge the compasitors in the pcm, OBD2 requires a code scanner 50 key cycles is going to be pretty worthless with out finding the problem.

JrRifleCoach · 11-21-2009, 07:12 PM

Quote:

Originally Posted by sv41878

Almost any parts store has a code reader as a loaner, just borrow it for 5 minutes to read and reset the codes and fix the issue before it turns on again.

Why the f##k I live in this miserable state is beyond me!
-- Ridiculous smog laws designed to kill the hot rod market.
-- Lousy water based paint that deteriorates in a few short years
-- Bug killers that won't kill bugs
-- Gun laws that make law abiders all criminals
-- And now we can't rent or buy code scanners
unless we have a license!?!?!

If I didn't have some great friends and enjoy the weather,

I tell these f'n liberals to kiss my hairy white azz!!!

11-19-2009, 10:30 PM	#1
JrRifleCoach Member Join Date: Aug 2008 Posts: 110 My Photos 1992 Cherokee Year: 1992 Model: Cherokee Engine: 6 Transmission: a4 Misc Accessories: Stock	How does one reset the check engine light? I read somewhere that you can switch on/off 50 times to put out the light. Will this really work? Or just wear out the switch prematurely? __________________ "..It does not require a majority to prevail, but rather an irate, tireless minority keen to set brush fires in people's minds.."--Samuel Adams

11-20-2009, 01:57 PM	#7
CherokeeMan96 Junior Member Join Date: Apr 2009 Location: Radford/Yorktown Posts: 88 My Photos 1996 Cherokee Year: 1996 Model: Cherokee Engine: 4.0 litre HO Transmission: jasper rebuild Rear Axle: dana 35 Tires: 28X8.50 BFG Allterrains Lift Specifications: Gabriel Hijackers on the back and 2" blocks in the front coils Misc Accessories: AFE Intake, flowmaster, 89 raised chrome 4x4 decals, rims offa ford ranger	ive just disconnected the battery, say...half an hour. u know, disconnected it, went in the house had lunch n came back, it dumps the code memory, but if its a persistant prob itll come back...thats when that code reader from autozone comes in handy __________________ A Jeep on Jeep collision is like an unstoppable force meeting an immovable object...

11-20-2009, 06:04 PM	#9
krkx93 Senior Member Join Date: Sep 2009 Location: louisiana Posts: 708 My Photos 1994 Cherokee Year: 1994 Model: Cherokee Engine: 2.5L Transmission: 5 speed Transfer Case: np231 Front Axle: d30 Rear Axle: ch. 8.25 Tires: 31 in. liberator a/ts Lift Specifications: 3 in. rc + 2 in. bb for 5 in, Misc Accessories: home made grill guard deal little bits here and there	depending on what year you have... 96 and older after youve fixed the problem causing it to turn on the light will turn off after 50 key on/off cylces. heres a link on how to read the codes and what not http://go.jeep-xj.info/HowtoECUcodes.htm __________________ no half measures... build thread. check it out http://www.cherokeeforum.com/f46/down-south-jeep-30873/

11-20-2009, 08:03 PM	#10
xj4life2 Member Join Date: May 2008 Location: Nor Cal Posts: 239 My Photos 1990 Cherokee Year: 1990 Model: Cherokee Engine: 4.0 Transmission: auto Transfer Case: 242 Front Axle: 30 Rear Axle: 35 Tires: 32x11.50x15/35x12.50-15 off road Lift Specifications: 4.5 Rubicon Express w/ 2" spacers Misc Accessories: Front winch bumper w/ Smittybuilt 8000lb , internal rack , M.O.R.E str. brace plus other goodies	to clear codes disconnect the battery for thirty sec's to reset the ecm disconnect the neg and pos leads and touch them together. __________________ Chapter Leadership 4x4him NOR CAL

11-20-2009, 11:40 PM	#12
krkx93 Senior Member Join Date: Sep 2009 Location: louisiana Posts: 708 My Photos 1994 Cherokee Year: 1994 Model: Cherokee Engine: 2.5L Transmission: 5 speed Transfer Case: np231 Front Axle: d30 Rear Axle: ch. 8.25 Tires: 31 in. liberator a/ts Lift Specifications: 3 in. rc + 2 in. bb for 5 in, Misc Accessories: home made grill guard deal little bits here and there	yea but if you disconect the battery then itll read a code 12 __________________ no half measures... build thread. check it out http://www.cherokeeforum.com/f46/down-south-jeep-30873/

11-19-2009, 10:38 PM	#2
The Black Member Join Date: Apr 2009 Location: New Waverly, Tx Posts: 194 My Photos 1997 Cherokee Year: 1997 Model: Cherokee Engine: Custom Rebuilt Long Block, Red 4.0 Valve Cover, JeepersCreepers 60mm TB, '99-'01 intake, BorlaHeader Transmission: stock Transfer Case: stock, dropped Front Axle: d30 Rear Axle: d35 Tires: ProComp 32 11.5 15 ProComp 15x8 Rims Lift Specifications: 4.5 Rubicon SuperFlex SbarD SYE JeeperzCreeperzs HD Crossover Steering Misc Accessories: Defender Roof rack 6KClites, Skidplates, ProComp Tow Strap, HiLift Jack	Try disconnecting the pos. bat cable and touch it to the engine block for 30sec. But I am thinking it will throw a code again later. Codes are started over after 50 starts, I believe.

11-19-2009, 11:16 PM	#3
sv41878 Seasoned Member Join Date: Jun 2009 Location: CNY Posts: 403 My Photos 1996 Cherokee Year: 1996 Model: Cherokee Engine: 4.0 H.O. Transmission: 4 speed auto Transfer Case: np231 Front Axle: Dana 30 Rear Axle: Chrysler 8.25 Tires: 31/10.50/15 Lift Specifications: 3 inch rough contry Misc Accessories: custom bumper, looking for some ideas	Almost any parts store has a code reader as a loaner, just borrow it for 5 minutes to read and reset the codes and fix the issue before it turns on again.

11-20-2009, 09:46 AM	#5
sv41878 Seasoned Member Join Date: Jun 2009 Location: CNY Posts: 403 My Photos 1996 Cherokee Year: 1996 Model: Cherokee Engine: 4.0 H.O. Transmission: 4 speed auto Transfer Case: np231 Front Axle: Dana 30 Rear Axle: Chrysler 8.25 Tires: 31/10.50/15 Lift Specifications: 3 inch rough contry Misc Accessories: custom bumper, looking for some ideas	Yeah connecting + and - is a bad idea, sometime you can reset the PCM by pulling the fuse with the ignition on and leaving it out for 10 seconds, but a code scanner is the best way to go, then you know why it threw a code too.

11-20-2009, 01:06 PM	#6
4wheeldrivenewbie Junior Member Join Date: Aug 2009 Location: maine Posts: 60 My Photos 1989 Cherokee Year: 1989 Model: Cherokee Engine: 4.0 straight 6 Rear Axle: dana33	disconnect the negative battery terminal for 10 mins then reconnect start a couple of times over the course of the day till the computer readjusts it self

11-20-2009, 03:52 PM	#8
cj11 Member Join Date: Aug 2009 Posts: 149 My Photos 1997 Cherokee Year: 1997 Model: Cherokee Engine: 4.0L Transmission: auto Front Axle: d 30 Rear Axle: d 35 Tires: 32X11.5X15 Lift Specifications: 4 inch Black Diamond	I have used the + and the - for 30 seconds on many vehicles and never had a computer problem works every time

11-20-2009, 08:22 PM	#11
sv41878 Seasoned Member Join Date: Jun 2009 Location: CNY Posts: 403 My Photos 1996 Cherokee Year: 1996 Model: Cherokee Engine: 4.0 H.O. Transmission: 4 speed auto Transfer Case: np231 Front Axle: Dana 30 Rear Axle: Chrysler 8.25 Tires: 31/10.50/15 Lift Specifications: 3 inch rough contry Misc Accessories: custom bumper, looking for some ideas	I'll buy the story about touching the 2 together AFTER they have been disconnected, I had a blazer that the codes cleared when I pulled the computer fuse. I say just go to the parts store. And yeah I know from experience that 96's will clear the codes on their own, mine does it instantly (had an issue with the temp sensor for the aux fan being disconnected while I was trying to figure out a gauge issue).

11-20-2009, 11:52 PM	#13
Dwinthrup Junior Member Join Date: Oct 2009 Location: Hutchinson Posts: 85 My Photos 1990 Cherokee Year: 1990 Model: Cherokee Engine: 4.0L Transmission: Auto Transfer Case: NP242 Tires: 31 10.5 15	OBD1 only need to disconnect the battery or pull the fuse and push and hold the brake pedel for 20 sec or so to discharge the compasitors in the pcm, OBD2 requires a code scanner 50 key cycles is going to be pretty worthless with out finding the problem.

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