Problemswith a p0183 code. At my wits end

[hrefab]

I posted this on a different Pathfinder forum and got exactly zero responses..  Before I do something drastic, I'm hoping that someone here might have an answer, part number, trick or simply solid advice as to how to get this resolved. Below is the post I made which pretty much explains my issue. Thank you in advance for any advice. Just as an add in, I have replaced everything connected with this code other than the fuel pump itself. I didn't change that because it was working perfectly, and tghe fuel temperature sensor is on the flat assembly not the pump. If that's a mistake, I'd sure like to know. At this point the fuel pump cost is insifgnificant compared to not being able to operate teh truck with a proper inspection. NYS is very strict and I'm stuck here with no vehicle.

 

I am pulling my hair out with this p0183 problem. I need to get this cleared up before I can get my R50 inspected. (The p0183 throws the MIL light, which blows the inspection.)

I replaced the fuel tank float assembly (which is separate from the fuel pump and contains the fuel temp sensor) and still had an issue with no gas gauge.. So I took the dash assembly out to send to Atlanta Speedometer who rebuilt the entire dash assembly and got the fuel gage working.

Reinstalling things, I STILL get the p0183 error. So I thought perhaps I had a bad float unit and replaced that with a new one. STILL no progress.
The plugs have been tested, the wiring has been tested and all comes up good yet I can't get rid of this error code. The ONLY thingz I haven't replaced is the actual fuel pump but it is a separate unit and not containing the fuel temp sensor.

I'm really at wits end with this. I've already put nearly $1000 into chasing this problem and at this point, I just don't know which way to turn. I love the truck and it's mechanically excellent, but if I can't get an inspection, it's worthless to me.. ANy advice or tips will be greatly appreciated.
The float arm is free to move and returns the correct resistance at all levels. The temp sensor shows proper resistance and continuity. WIreing on the plug is unbroken and also shows correct continuity and the dash is fully functional...

[Slartibartfast]

The '04 service manual (free download from Nicoclub) says P0183 means the computer is seeing a higher-than-expected voltage from the tank temp sensor circuit. EC-293 describes the code and says what the voltage should be. Looks like one side of the sensor goes to the cluster, and the other goes to the computer, so if you've only buzzed out the wiring to the cluster, looks like you have another one to chase. There's a diagnostic procedure starting on EC-296. Run through that and see if you get anywhere.

 

I would also unplug the sensor and pump and make sure there's no continuity between the sensor and any other connection on the level sensor or the fuel pump, on the off chance something is crossed up internally. I don't know if this is even possible (looks like the connectors are separate and the sensor is a sealed unit), but it would be pretty quick to rule out.

[hrefab]

Thank you for that information. At least I have one more avenue to look at. This has really been driving me crazy,costing money, and keeping me off the road. I already racked up one expired inspection ticket, and with my limited income, I can't afford another one (not to  mention the hit my insurance is probably going to take). I'll report back if I get this sorted out with all the particulars. Thanks again for a quick reply.

[hawairish]

Echoing 100% what Slartibartfast described and suggested.  It would also help to know what voltage and/or resistance you were seeing at temperature because the FSM also specs a range.  The table there only shows two reference points (3.5V/2.3-2.7kΩ @ 68°F, 2.2V/0.79-0.90kΩ @ 122F), but as I imagine NY is a bit colder than 68°F this time of year, you'll need to confirm resistance at ambient temp against the resistance chart, whether it's in acceptable range, and that the resistance decreases as the sensor warms up...measuring while submerged in tap water will suffice.

 

I do suspect the sensor is fine, though, so you need to check resistance on both legs of the circuit as Slart described.  FSM has the pin locations and troubleshooting steps.

 

Good luck!