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  #13  
Old 05-06-2015, 11:07 PM
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Re: Running a little rough

here is the list of the codes we pulled. Among other bad things I have described before:
P0031 - Oxygen Sensor Heater Control Circuit Low (Bank 1 Sensor 1)
P0051 - Oxygen Sensor Heater Control Circuit Low (Bank 2 Sensor 1)
P0303 - Cylinder 3 Misfire Detected
P0136 - Oxygen Sensor Circuit Malfunction (Bank 1 Sensor 2)

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  #14  
Old 05-07-2015, 08:16 AM
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Re: Running a little rough

For the first two codes, have a look first at fuse 16 (15A) in the power distribution center under the hood. If its blown, you will have to check the wiring of the upstream O2 sensors for chaving or melted isolation due to touching hot exhaust part.
Did you check/change the plugs and did you see anything special on the #3 plug? If the code persists, you could swap the coil from #3 with #1 and see if the fault will follow.
For the last code i would check the wiring from the bank 1 after cat O2 sensor. If you have a scanner which shows live data, you could monitor the O2 sensor voltage and compare to the bank 2 reading.
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  #15  
Old 05-20-2015, 10:53 PM
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Re: Running a little rough

UPDATE: so we have replaced all 4 o2 sensors and my dad replaced the relay. Now, here is the issue. When the ignition is just on, before you crank to get it started, the fuse for the o2 sensors blows, thus giving the codes. After looking at the schematic from the Haines manul it looks like it can only be something called o2 sensor upstream? What is that, where its located and how to replace it?

If its not that, then there is a short somewhere between the fuse and the sensor
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  #16  
Old 05-21-2015, 05:36 AM
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Re: Running a little rough

O2 sensor upstream is just the before cat O2 sensor. If the fuse was not blowing before the O2 sensor change, I would start measuring the O2 sensor heater resistances.
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  #17  
Old 05-21-2015, 12:33 PM
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Re: Running a little rough

I do remember that the fuse kept blowing before the sensor change. Thats what made us change the sensors in the first place. We thought one of them was short.
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  #18  
Old 05-21-2015, 10:04 PM
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Re: Running a little rough

So now you will have to check the wiring from the PCM to the O2 sensor connector for shaving or melted isolation. If you donīt see anything wrong, you will need to measure the wires to ground and see if it indicates some short.
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  #19  
Old 05-22-2015, 01:34 AM
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Re: Running a little rough

what wire colors should i check primarily? is there a detailed schematic available anywhere?
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  #20  
Old 05-22-2015, 02:14 AM
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Re: Running a little rough

I can send it to you later, when iīm at home.
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  #21  
Old 05-22-2015, 01:22 PM
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Re: Running a little rough

Ok, attached the wiring schematic for the O2 sensors. Your jeep most probably doesnīt have the hydraulic cooling fan, isnīt it? Because the hydraulic cooling fan module is also fed via the same fuse #16, but if you would have this cooling fan and the fuse blows, you also get a fault code for the hydraulic cooling fan solenoid, which you donīt have.
So my previous words of measuring between PCM and O2 sensor was wrong, because you should measure between the fuse #16 (pin 17) and ground. Most probably you will measure a short and will have to check the wiring between the PDC and the O2 sensor connectors. There must be a shaved or melted isolation of one of the O2 wires.
You could remove the downstream O2 sensor relay in the PDC for trouble shooting, if the short is gone with the relay removed, then most probably the short is in the wiring to the downstream sensors. If the short persists with the relay removed, then you will have to check the upstream sensor wiring.
Attached Files
File Type: pdf 4.7L O2 sensors.pdf (286.6 KB, 1 views)
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  #22  
Old 05-23-2015, 08:38 PM
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Re: Running a little rough

okay. The title says 4.7L but this one we are working on is a 4.0. Is there any difference?
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  #23  
Old 05-23-2015, 11:03 PM
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Re: Running a little rough

Yeah sorry, i only looked at your signature and didnīt remember the first post saying it is regarding a 4.0L. For the O2 sensors power feed there is no real difference. Its just a straight power wire from the fuse #16 to the upstream sensors and via a relay to the downstream sensors. If you remove the relay for trouble shooting, you can determine if the problem is with the upstream sensor wiring, or the downstream sensor wiring.
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  #24  
Old 06-01-2015, 12:12 PM
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Re: Running a little rough

UPDATE: So we eneded up replacing crankshaft position sensor as well as the 4 O2 sensors. Now the Jeep is fixed and running fine. Also figured out where a clickkin noise was coming from. Turns out, when we had the transmission rebuilt, the guys didn't secure the transfer cse shift cable correctly and it has been grinding in the front driveshaft the whole time. Now, part of the cable got "shaved off" and there is a shiny spot on the driveshaft where it used to grind. But for now he is working and no major problems.
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