newbie - Check Engine Light

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Oct 31, 2008 | 03:09 AM

#16

BlueXJ

Renix Super Guru

Joined: Mar 2008

Posts: 24,653

Likes: 19

From: In yourz postez fissin jurr spelinzs

Year: 1990XJ/1989MJ

Model: Comanche

Engine: 4.0L Renix

Quote:

Originally Posted by VinceV

Hi,

I finally got the codes. I used the key trick. I didn't know what FrankZ meant at first (and I still don't know what he meant by 'CEL'), but I found the thread that listed OBDI codes. I'm getting a code 35 and 21.

BlueXJ, I am capable of doing some of the work if it's not too complicated (I normally do routine maintenance work on my vehicles), I just need some help with the troubleshooting.

Not sure about code 35. I found a thread that listed code 35 as 'Cooling fan relay circuit open or shorted' OR 'idle switch motor fault - check connections'. The thread that BlueXJ posted a link to only says 'Cooling fan relay. Check relay and circuit.' for code 35. Which is it?

Thanks.

Code 35 is exactly that Check the cooling fan itself and the related relay and the related wiring between the two. My guess is there is a poor connection in that circuit somewhere.

Oct 31, 2008 | 03:57 PM

#17

VinceV

Thread Starter

Newbie

Joined: Oct 2008

Posts: 12

Likes: 0

From: Los Angeles, California, USA

Year: 1995

Model: Cherokee (XJ)

Engine: 4.0L I6

Thanks. My confusion with code 35 was about the 2 possible definitions (cooling fan relay circuit vs idle switch motor fault), depending on which OBDI code thread is correct.

Oct 31, 2008 | 05:45 PM

#18

BlueXJ

Renix Super Guru

Joined: Mar 2008

Posts: 24,653

Likes: 19

From: In yourz postez fissin jurr spelinzs

Year: 1990XJ/1989MJ

Model: Comanche

Engine: 4.0L Renix

Let us know what you find VinceV

Oct 31, 2008 | 06:37 PM

#19

SeriousOffroad

CF Veteran

Joined: Apr 2008

Posts: 13,952

Likes: 17

Model: Cherokee

Quote:

Originally Posted by VinceV

(and I still don't know what he meant by 'CEL')

Check
Engine
Light

Nov 1, 2008 | 08:01 PM

#20

VinceV

Thread Starter

Newbie

Joined: Oct 2008

Posts: 12

Likes: 0

From: Los Angeles, California, USA

Year: 1995

Model: Cherokee (XJ)

Engine: 4.0L I6

I replaced the oxygen sensor and both codes 35 and 21 were cleared.

Jan 5, 2009 | 02:32 PM

#21

HeepSpeed

Member

Joined: Nov 2008

Posts: 229

Likes: 0

From: Los Angeles

Year: 1997

Model: Cherokee

Engine: 4.0 I6

Did you replace the sensor yourself or have a shop do it? Where'd you get your parts? I supposedly need to do this too

Jan 6, 2009 | 12:09 AM

#22

VinceV

Thread Starter

Newbie

Joined: Oct 2008

Posts: 12

Likes: 0

From: Los Angeles, California, USA

Year: 1995

Model: Cherokee (XJ)

Engine: 4.0L I6

I replaced the sensor myself. You can find the sensor at most auto parts stores.

Last edited by VinceV; Jan 6, 2009 at 12:12 AM.

Jan 6, 2009 | 01:07 AM

#23

MasterShakeXJ

CF Veteran

Joined: Nov 2008

Posts: 1,251

Likes: 0

From: Eugene, OR

Year: 01

Model: Cherokee

Engine: 4.0L I6

sometimes the CEL will randomly come on,(sometimes it turns out to be a fluke, other times it means theres a problem) i've noticed it sometimes when out wheeling, it will get heat soaked/vapor locked. running hot and turning the engine off for a short time, when you start it back up it will sputter and misfire and throw codes. last trip out every XJ had this problem. easiest solution; when you stop, leave it running, or turn it off and pop the hood. we all know how hot these XJ's run.