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Old 07-23-2012, 07:20 PM   #1
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Engine code sequence P0031, P0037, P0051, P0057

I'm adding to the forum here a thread on this particular code sequence, since I don't see it here.

I was driving, and the check engine light came on. I have noticed as of a few days ago that the engine idling is a little off. The tachometer doesn't register it, but you can hear/feel it where the idling drops and goes back up here and there, but barely noticeable.

This is a 2005 LJ with the inline 6 for Texas. Does this Jeep have 2 or 4 sensors?

By the way, these codes do not show up on the list here - Tech - TJ Error Codes - GETAHELMET.COM and here - Jeep OBDII Scan Codes

Not there. What do they represent? I thought Texas LJs have only two sensors, or do I have four? I can't find the other two because I don't know where to look.

Has a tuneup fixed this problem, as it is due for it? It has just over 29,000 mi at this time.

Thank you!

Stephanie

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Old 07-24-2012, 09:31 AM   #2
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Bump, to try to get an answer.

I went to O'Reilly's this morning to get the codes printed out.

It looks like I have four sensors involved. The strange thing though, is that all went down at once, not one after the other over days or weeks. Light comes on in the last mile to home, I find out how to check the codes, and they all read out immediately with the ignition key sequence.

Does this look like my PCM f...

<snip>

It PAYS to try some things yourself.

I interrupted myself on a hunch and went out to the Jeep and looked for the leads to the front two sensors, since it wasn't just one or the other sensor going down. I couldn't find the PCM I had seen in a photo of one - maybe I was looking at an older Jeep made before 2003? So, here's a photo of this wall socket block. I jiggled and pushed in each of these four connectors positioned right above the battery, and the check engine light went away. I drove it around very shortly with no problems. I would have to drive it for a while to see if the very slight stumble in the idle has gone away.

Is this the PCM?
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Old 07-24-2012, 12:52 PM   #3
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You have four sensors.

SYMPTOM
P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW

WHEN MONITORED
Battery voltage above 10.6 volts , ASD is powered up, and O2 heater is on.

SET CONDITION
O2 Heater element input is below the minimum acceptable voltage.

POSSIBLE CAUSES
O2 Sensor heater operation
O2 Heater element
O2 Heater control circuit
O2 Heater control shorted to ground
PCM

SYMPTOM
P0037
-O2 SENSOR 1/2 HEATER CIRCUIT LOW

TEST NOTE
This symptom is diagnosed using the test P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW.

WHEN MONITORED
Battery voltage above 10.6 volts , ASD is powered up, and O2 heater is on.

SET CONDITION
O2 Heater element input is below the minimum acceptable voltage.

POSSIBLE CAUSES
O2 Sensor heater operation
O2 Heater element
O2 Heater control circuit
O2 Heater control shorted to ground
PCM

SYMPTOM
P0051-O2 SENSOR 2/1 HEATER CIRCUIT LOW

TEST NOTE
This symptom is diagnosed using the test P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW.

WHEN MONITORED
Battery voltage above 10.6 volts , ASD is powered up, and O2 heater is on.

SET CONDITION
O2 Heater element input is below the minimum acceptable voltage.

POSSIBLE CAUSES


O2 Sensor heater operation
O2 Heater element
O2 Heater control circuit
02 Heater control shorted to ground
PCM

SYMPTOM
P0057-O2 SENSOR 2/2 HEATER CIRCUIT LOW

TEST NOTE
This symptom is diagnosed using the test P0031-O2 SENSOR 1/1 HEATER CIRCUIT LOW.

WHEN MONITORED
Battery voltage above 10.6 volts , ASD is powered up, and O2 heater is on.

SET CONDITION
O2 Heater element input is below the minimum acceptable voltage.

POSSIBLE CAUSES


O2 Sensor heater operation
O2 Heater element
O2 Heater control circuit
O2 Heater control shorted to ground
PCM
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Old 07-24-2012, 03:11 PM   #4
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Yeah, I was afraid of that... And I have the print out.

Where are the other two sensors at? I see the two on the driver's side.
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Old 07-24-2012, 03:31 PM   #5
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They should be roughly the same location on the passenger side. One before the cat and one after.
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Old 07-24-2012, 03:51 PM   #6
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Crawl under the Jeep. They are located on the drivers side.
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Old 07-24-2012, 04:10 PM   #7
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They are on both actually. Bank 1 is driver side, bank is passenger side. Both location 1 are before your catalytic converter bank 2 is after the cat. So bank 1 sensor 1 would be driver side just off the exhaust manifold bank 1 sensor 2 is driver side just after the cat. Same for bank 2. All for sensors really don't go at one time. I'd be looking at you circuit voltage and ground before you spend the cash. You can reset the "system" if you unplug your battery for 30 min to let all modules loose voltage. Than reconnect the battery and try again.
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Old 07-24-2012, 07:47 PM   #8
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Quote:
Originally Posted by Batjeep09 View Post
They are on both actually. Bank 1 is driver side, bank is passenger side. Both location 1 are before your catalytic converter bank 2 is after the cat. So bank 1 sensor 1 would be driver side just off the exhaust manifold bank 1 sensor 2 is driver side just after the cat. Same for bank 2. All for sensors really don't go at one time. I'd be looking at you circuit voltage and ground before you spend the cash. You can reset the "system" if you unplug your battery for 30 min to let all modules loose voltage. Than reconnect the battery and try again.

Do you even own a Jeep? Explain to me from this picture below how the 02 sensors are on both sides of the motor? Stop giving out bad advice. The picture is from an 05 TJ 4.0.

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Old 07-24-2012, 08:36 PM   #9
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Quote:
Originally Posted by Batjeep09
They should be roughly the same location on the passenger side. One before the cat and one after.
Quote:
Originally Posted by Batjeep09
They are on both actually. Bank 1 is driver side, bank is passenger side. Both location 1 are before your catalytic converter bank 2 is after the cat. So bank 1 sensor 1 would be driver side just off the exhaust manifold bank 1 sensor 2 is driver side just after the cat. Same for bank 2. All for sensors really don't go at one time. I'd be looking at you circuit voltage and ground before you spend the cash. You can reset the "system" if you unplug your battery for 30 min to let all modules loose voltage. Than reconnect the battery and try again.
Bank one is cylinders 1,2,and 3 (front 3). Bank two is cylinders 4,5, and 6 (rear 3). In a "Cali" emissions setup (4 O2 sensors) the sensors are before and after the "PreCats" in the header. Crawl under your drivers side door and look toward the engine on the exhaust, you can't miss them. So for example, bank one sensor one is first O2 sensor from the engine (upstream) on the front part of the header. Downstream on either bank is furthest to the rear (after the PreCat). Etc. In a Cali setup, there is no O2 sensor after the main cat or muffler.
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Old 07-24-2012, 08:53 PM   #10
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Easiest way to fin your O2 sensors is to start at the header pipe and work your way down. My 2000 tj only has two and if you have four you will find two near the header pipe and two downstream somewhere with at least one after the cat. The ones I've seen usually have two sensors amongst the header tubes just ahead or behind what they call mini cats and then the others will be after the main/big cat converter.

Above you asked if that is your PCM and you are correct, those three plugs need to be securely connected. I'd recommend cleaning them with aerosol electrical contact cleaner available at an auto parts store. All four sensors shouldn't go bad at the same time so you most likely have an electrical issue that's tripping codes. If you can get access to a real time scanner that will show you graphs of the voltage readings from those sensors then you can easily determine if they are good or bad. A scanner like that is not available from a parts store though and you need a computer to run it. A dealer might have a scanner like that but will charge you a ton to do that. Mine is software that I run on a labtop with an OBD 2 to USB adapter.

I'd say you had a bad connection to the PCM so clean those cable contacts and disconnect the battery for a half hour to reset the computer. Then see what happens. 29000 miles is early for 02 sensor failure.
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Old 07-24-2012, 09:23 PM   #11
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Quote:
Originally Posted by bwpilot20
Easiest way to fin your O2 sensors is to start at the header pipe and work your way down. My 2000 tj only has two and if you have four you will find two near the header pipe and two downstream somewhere with at least one after the cat. The ones I've seen usually have two sensors amongst the header tubes just ahead or behind what they call mini cats and then the others will be after the main/big cat converter.

I have an 01 4.0 with a Cali emissions setup. There are two before and after the pre-cats, that's it. From what I have read, that is how all TJ's with the Cali emissions are. Nothing around the main cat. If you only have two sensors, then yes, you'll have one back there.
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Old 07-26-2012, 03:16 PM   #12
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View from under drivers side door, just in front of skid plate, looking up towards the front. You can see all 4.

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Old 07-26-2012, 03:46 PM   #13
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Sigh... How did I end up with a California Jeep when I bought it here in Houston? It was bought brand-new by the previous owner here in this county. Unless some dealer in CA had it and it fit the owner's needs. What else is different between a Cali Jeep and a regular Jeep?

Right, it was a connection. I don't know the materials, but if it's anything like memory sticks, I remember the time when it was discovered that there were problems with PC memory sticks being used in certain computers because the leads on the sticks and mainboards were made of different metals, resulting in oxidation of the contacts and causing current resistance, which caused memory errors. If you have contacts of different materials, you have to clean them periodically.
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Old 07-26-2012, 03:57 PM   #14
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Quote:
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Sigh... How did I end up with a California Jeep when I bought it here in Houston? It was bought brand-new by the previous owner here in this county. Unless some dealer in CA had it and it fit the owner's needs. What else is different between a Cali Jeep and a regular Jeep?

Right, it was a connection. I don't know the materials, but if it's anything like memory sticks, I remember the time when it was discovered that there were problems with PC memory sticks being used in certain computers because the leads on the sticks and mainboards were made of different metals, resulting in oxidation of the contacts and causing current resistance, which caused memory errors. If you have contacts of different materials, you have to clean them periodically.
I'd have to google it again, but it's just luck of the draw. The Cali setup isn't just meant to be sold in California. Got mine here in WV, and we still don't have emissions testing.
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Old 07-26-2012, 04:58 PM   #15
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I'd say you had a bad connection to the PCM so clean those cable contacts and disconnect the battery for a half hour to reset the computer. Then see what happens. 29000 miles is early for 02 sensor failure.
I turned on the headlights before taking the battery off and touched the battery leads together for two minutes (what I read elsewhere, but had to do it with a wrench as I couldn't move the positive terminal cable very much). I did the 3 off-on cycle on the ignition key, and it said done.

And of course I turned off the head lights, as it was beeping at me. If it happens again, I know what to do, since I haven't bought the contact cleaner yet and will have to wait until next month to do it. This forum is awesome!



P.S. I washed my Jeep in the rain again. I just love looking at it!
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Old 07-30-2012, 10:47 PM   #16
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The codes are back up again. No amount of jiggling made it go away. The engine check light is on instantly after starting, so it's not a heat issue. I'm going to attempt to clean the contacts on the PCM. Where else would I look for a weak link in the design related to the O2 sensor system?
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Old 07-31-2012, 09:57 AM   #17
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Have you done any mods at all lately before this all started?
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Old 07-31-2012, 10:04 AM   #18
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Nope. This Jeep is completely stock. I went out this morning and completely disconnected all the connectors at the PCM, reconnected them, and started up the Jeep, and the engine check light went away, and I disconnected the battery again. I also did a test on the battery theory. All you really need to do is turn on the headlights and disconnect the battery, positive terminal first for safety, for about 30-60 seconds, and the codes will clear unless there is a problem. I drove to get gasoline. No light so far. I probably need to clean the contacts, but they appeared to be completely clean, no moisture, no rust (since these are not steel pins and slots). The pins and female slots (in the sockets) appear to be made of the same metal. Anyway, I'm having to wait until tomorrow to get the contact cleaner. Any recommendation for a brand?

Let's see how well this holds up...
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Old 08-01-2012, 01:07 PM   #19
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I use stuff that I bought from Orielly's that is called "QD Electric Contact Cleaner" in a red/white can. It's similar to brake cleaner but dries quicker and smells a little different. You could just use it on any of those sensor connections. My PCM connections where spotless when I looked at them, the plugs are sealed pretty good. I just thought that you had said yours were loose in an earlier post and so may have allowed moisture in... Can't hurt to use the cleaner though. I had to get some when I first bought my jeep because my dash cluster was randomly loosing connection and causing the infamous "NO BUS" problem on the odometer.
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Old 08-14-2012, 04:20 PM   #20
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Problem solved! It was a pair of wires that control the oxygen sensors inside the main loom that runs along the firewall over to the PCM. The wiring loom was twisted out of place, exposing the two wires and rubbing them against this shiny round thing on the back side of it, and the wires were shorting together. That was taken out and new wire spliced in, sealed, and a loom installed over the loom and zip-tied into place so it wouldn't happen to other wires.

I'm a happy camper now! And I just had 30k maintenance done on it, and we're ready to roll for many more miles!
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Old 12-28-2012, 02:37 PM   #21
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Problem... Not solved! The problem was supposedly fixed while I was in Ohio when I made the previous post in this thread. It came back just a few hours after I picked up the Jeep, and the mechanic tried tracing it down, but couldn't figure out anything. Months later, today, I tried something. I tried this before, making a turn at a badly-constructed driveway into a shopping parking lot. this turn will make your Jeep pitch a total of 70 degrees or so, side-to-side, violently if you do not come to a COMPLETE stop and then climb into the driveway. Just like last time, the shaking would cause the check Engine light to go off, bringing all four oxy sensors back online. It'll be back on, though. Where do I check for the weak link? Is the oxy sensor wiring something that I can strip out and replace myself?
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Old 03-06-2013, 02:22 AM   #22
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Any updates? My jeep has the same codes and now recently a transmission code as well. Took it to the dealership and they are telling me the PCM is bad
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Old 03-06-2013, 03:00 PM   #23
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No updates other than the fact that every time I drive over a badly-made street exit onto a driveway, the Jeep shakes side-to-side enough to make the light go off. Every single time, so I know it's a wiring situation.
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Old 05-23-2013, 06:05 PM   #24
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The problem is hopefully solved; a bad PCM! it was COVERED under federal emissions warranty with 3 months left to go!! I had to get this fixed to pass inspection this month. Now to get new shoes for the girl! Tire Details - Discount Tire

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