2000 Jeep Cherokee O2 sensors reporting heater failure.

Tiny
SWAMPFOXJ
  • MEMBER
  • 2000 JEEP CHEROKEE
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 148,000 MILES
Hi All
I am having a problem with the O2 sensors turning on the engine light. This problem is random and may take several days to occur. The probes test ok and the only fault I have found to this point is a blowen 20 amp fuse which I replaced. I have not been able to purchase a manual and hope you can help in this puzzle? Well any more quetions I would be happy to respond.

Jim
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Monday, June 16th, 2008 AT 7:37 PM

11 Replies

Tiny
BMRFIXIT
  • EXPERT
Hi Jim
well lets start by getting the codes
you can do so by cycling the ignition switch on off three times ending with key in the on position
read (P) codes in the odometer area
as for the fuse is it keep on blowing and if so you need to locate a short on that circuit

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Monday, June 16th, 2008 AT 8:00 PM
Tiny
SWAMPFOXJ
  • MEMBER
Hi and thank you for your help here are the codes.
P0132 O2 SENSOR CIRCUIT HIGH VOLTS BANK1 SENSOR1
P0135 O2 SENSOR CIRCUIT MALFUNCTION BANK 1 SENSOR 1
P0141 02 SENSOR CIRCUIT MALFUNCTION BANK 1 SENSOR 2
P0300 RANDON/MULTIPULE CYLIDER MISFIRE DETECTED
P0303 CYLINDER 3 MISFIRE DETECTED
P0304 CYLINDER 4 MISFIRE DETECTED
P0305 CYLINDER 5 MISFIRE DETECTED
P0161 02 SENSOR HEATER CIRCUIT MALFUNCTION BANK 2 SENSOR2
P0155 02 SENSOR HEATER CIRCUIT MALFUNCTION BANK 2 SENSOR1
I currently have not found a manual for this vehicle and am far from home for the next few months.
I will do my best to provide the information you request but on this depot they have no auto hobbie shop to work with. As for the fuse it is still working but I did not check it again today and will do so in the morning.

Jim
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Monday, June 16th, 2008 AT 8:34 PM
Tiny
BMRFIXIT
  • EXPERT
You do have a lot of codes
is it running ok for you
you may want to check it for tune up
also check the wiring harness for short
reset the codes and lets check what return for codes

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Monday, June 16th, 2008 AT 9:00 PM
Tiny
SWAMPFOXJ
  • MEMBER
It appears that each time the 20 amp fuse blows seven days or so sense last replacement the O2 sensors fail. I have found a Hanyes manual but in the wireing diagram for the O2 sensor no fuse is found.
I think that when one of the precat sensors is pulling to much current and blowing the fuse but I am not familiar with this part of the jeep. Second the ac fan motor is having trouble and I wounder if the two have a common ground? Do you have any ideas for my project as I am at aloss on what to do next.
I have purchased a circuit breaker to replace the fuse should it blow again but that will only help so much.
You have been very kind and I wish to thatnk you for your help.
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Tuesday, June 17th, 2008 AT 7:54 PM
Tiny
BMRFIXIT
  • EXPERT
Give the o2 sensors wiring a look make sure the harness is OK and its not touching the ground and or the exhaust
best of luck

thank you !
Jack

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Tuesday, June 17th, 2008 AT 8:22 PM
Tiny
SWAMPFOXJ
  • MEMBER
Hi Jack

I do not understand how the site works yet so when it says give points is that 1 to 100 or the.1 which I have to give?

The wires to the O2 sensor are good I thinking the ground does not having a good connection to the frame. Not sure this is it but I will keep looking just would be nice to have a good schematic with some ohm values. Will make due until I can return home if I am not lucky enough to find the offending item.

Jim
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Tuesday, June 17th, 2008 AT 9:12 PM
Tiny
BMRFIXIT
  • EXPERT


http://www.2carpros.com/forum/automotive_pictures/99387_jeep0_1.jpg



http://www.2carpros.com/forum/automotive_pictures/99387_jeep_4.jpg



http://www.2carpros.com/forum/automotive_pictures/99387_jeep3_1.jpg

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Wednesday, June 18th, 2008 AT 6:14 AM
Tiny
BMRFIXIT
  • EXPERT
The point system allow you to give an opinion on they way you was helped by me
you have to have at least a point to give a feedback
and that will stay on my page (1 or 100 point still the same )

if you cannot read the wiring pic. I sent

let me know

Thank you
Jack

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Wednesday, June 18th, 2008 AT 6:24 AM
Tiny
SWAMPFOXJ
  • MEMBER
Hi Jack

Thank you for the try if you can send them in pdf I can blow them up so I can read them. However the fuse has blowen again and only two codes appeared p0141 and p0161 so maybe the part is on the way out and we will soon have a place to go please keep your finger crossed. I only have.1 points so I guess I can not leave feed back I am sorry this is my first time using the site I would give you a hundred. Well I got to go to bed only 10 more weeks before I can go home to my family and hopefully stay for a time Uncle Sam can be hard to work for some times.

Jim
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Thursday, June 19th, 2008 AT 8:57 PM
Tiny
BMRFIXIT
  • EXPERT
Hi Jim
check your email and let me know if its better

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Friday, June 20th, 2008 AT 6:17 AM
Tiny
SWAMPFOXJ
  • MEMBER
Hi Jack

The prints are great I can not thank you enough for this. I could not find the fuse in that Haynes book but it looks to me as if a relay is having an issue looking at the prints F17 and that would mean that I have been looking at the wrong part. I even had a mechanic pull them out and test them to make sure I was doing it right. He said they tested good to bad we did not know about the fuse then because Alan is a good egg and has helped my family a lot.
This makes some kind of sense because the vehicle sat for almost two years while I was in Iraq, Resistance up Current up fuse gone, will let you know if this is a fix. The hole time I was under the impression that the fuse was a direct connect to the heaters on the O2 sensors.

Thank you Jack my very best to you and your family I will send more money this payday, I havent been paid this month it takes Uncle Sam time to get use to us Gusrdsman becoming active duty again.

God Bless
Jim
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Friday, June 20th, 2008 AT 7:59 PM

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