skidz88

iTrader: (1)

P0462 - Fuel Level Sensor Circuit Low Input
P0507 - Idle Speed Control System RPM Higher Than Expected


Don't know what either means or how to fix it. My car has been slowly draining me of money since I bought it.

Car has 104,000KM (60,000MI). Spark plugs were changed 3 weeks ago, and a cracked rear valve cover was replaced 2 weeks ago. All service was done by one of the most reputable Nissan techs in the area. Last week my car threw those codes at me, had em both cleared by partsource and it was fine for a week until today when it came back on with those codes. Any ideas what to do?

SoonerFan

iTrader: (5)

maybe check the stickie about CEL and codes

skidz88

iTrader: (1)

I just knew you'd be the first to answer...yet not help me. lol

Yes I checked the stickies, do you see something I missed?

SoonerFan

iTrader: (5)

i did help you...i just didnt spoonfeed you

skidz88

iTrader: (1)

I shoulda known better than to ask for help here, lesson learned. Car is going in Monday to correct my SES. /end

SoonerFan

iTrader: (5)

you could ask for answers...or look for answers

djfrestyl

iTrader: (89)

Do you always expect things to be given to you? Or do you go out and get the results yourself?

sascuderi

I have a service manual for the 2000 and took a look but the codes don't match exactly, but the fuel level sensor is supposed to sence sloshing of fuel in the tank, even when the car is not running.

I think since you just had service done and the codes happend after the service I would just take it back as you are doing.

Sorry can't be more help.

bert

Here is an answer...

I had the fuel level sensor at about 65KKm, replaced the sensor under (extended) warranty. It's accessible by the top of the tank and you get there by removing the rear seat IIRC.

kevin007

The Idle Speed Control is probably due to a vacuum leak at the intake manifold, vacuum lines etc. Get some throttle body cleaner and spray around the intake, hoses or any source where air can leak if you see a change in idle speed you've found your leak if that is not the problem it could be your throttle body. I had the same code a month ago and I had a vacuum leak at the intake manifold. Fixed it and the problem went away.Do you have a OBDII Scanner ? If you have a OBDII scanner you can clear the codes yourself. Double check the work you had done 2 and 3 weeks ago thats probably were your leak is coming from.

skidz88

iTrader: (1)

sascuderi, bert, kevin007 thank you very much for your input. I think I have a pretty good idea about what's going on now.

kevin007

No problem with trying to help you, so what is causing the all the issues?

DasYears

could be a leaking UIM after it was taken off to replace the valve cover

KRRZ350

iTrader: (29)

Definitly could have been related to that plug job, a vacuum line could have slipped off as well. Also, IIRC they recommend doing the idle re-learns at that time also if I'm not mistaken.

kevin007

If that is the cause make sure they do a Idle air relearn for you at no cost after fixing the leak.

MintVQ35

iTrader: (1)

So you get 2 trouble codes and 2 basic maintenance items and you are unhappy with the car, yet you don't even know the fix or cause for those codes?

skidz88

iTrader: (1)

No leak thankfully, but it needed an idle relearn which I performed today.

I believe the fuel sensor code was caused when I almost ran my car dry(couldn't find a shell!).

I'm unhappy with the car because since I bought it in March 07 I've had to replace a wheel bearing and hub, airbag sensor, DRL module, Bose, Ignition coil, Rear valve cover and a few other items. Yes the spark plugs are basic maintenance, but the rear valve cover cracking?? I don't think so. I maintain my car extremely well, using only high end products...I just want it to run problem free for a few months, is that too much to ask? As of this very moment, it is running perfect so we'll see how long that lasts.

Much thanks to all who helped me out!

jkayca

Wow. A lot of work in a short space of time. Probably why the previous owner got rid of the car. I feel for you

sbg20307

OK. After taking my 2k3 in for plug replacement, I also got the P0507 problem. While doing the plugs, the shop cleaned the TB too. P0507 pops up. After searching, I reset the codes and ran through the three procedures in the FSM (IAVL being the last). My RPMs dropped from 1100 to 600. Like other people have seen on the next restart, the idle goes back high to 1100 rpm and P0507 fired.

Now it is back at the shop. I was told that they changed the TB but it didn't help. They are currently looking for a vacuum leak. Hopefully they find one. If they don't, should I recommend a ECM reprogram or replacement? Would this help if the IAVL only works until the car is restarted?

Any other ideas on how to fix this problem? I'm not clear if the unplugging of the MAF before the IAVL helps, as mentioned in a previous thread.

I have 82k so I'm not covered under any warranty.

sparks03max

iTrader: (7)

LOL they cleaned your TB? What idiots. That's definately the problem.

sbg20307

I'll have to ask the shop what exactly they did to clean the TB. Assuming the TB cleaning is the problem, what would fix the P0507 code?

I was told they tried to replace the TB and that didn't work.

NisTech

after replacing the new TB you have to relearn it again.
Everytime you guys replace your plugs DO NOT dissconnect TB electrical connector just set it aside or else you may have to do an IAVL.
IAVL should clear the idle speed. However we've seen some TBodies blow after cleanings and not wanting to complete the relearn.
Regarding your other code i don't know if you can just replace the sensor only or the whole fuel pump assy. But yank the seat out and it's underneath it and depending on if the sensor comes by itself or not it is very straightforward. Just don't smoke or use electrical impacting drills (they spark) on them screws and you should be fine.
Also order the o ring (gasket) for fuel pump.
If you want just do the whole pump if you have higher milage that way you don't have to worry about it and it even comes with a new in tank filter

NmexMAX

iTrader: (22)

Old thread FTL. I always clean my TB

NisTech

haha i never check those dates. Once someone brings it up it's game!

NmexMAX

iTrader: (22)

that's what I say too. I've found that learning the procedure and performing it every now and then when the code pops (spark plug change / tb cleaning) up eventually makes it go away.

jasonmax

iTrader: (2)

my car never pops a code, and I can't find any difference after performing ecu reset and idle relearn procedures.

NmexMAX

iTrader: (22)

The last time I did it, it didn't pop a code, but it still had the high idle. The only difference you should see is correct idle RPM, that's it.

jasonmax

iTrader: (2)

I saw someone saying that the reset precedure will bring extra power.
My car has a slight rough idle b/c I can see the tachometer moves up and down a little.

sbg20307

In case anyone has the same P0507 problem, here is my info.

I got my spark plugs changed and the shop also cleaned the TB in the process. Since that time, I have had a P0507 idle too high code that won't clear. Things that were tried:
1. reset ECU codes
2. replaced PCV
3. replaced TB
4. IAVL procedure every time the car is started (for a month). The procedure where you press the gas pedal five times, etc. did fix the problem until the car is restarted.

I paid $105 to the dealer and they fixed it by doing their idle volume air relearn procedure and the problem appears to be fixed. The service guy said that they use a $5000 console that is only available to Nissan service centers and that they needed to pull the fuel injectors during the procedure(?). He said nothing about an ECU re-program. The bottom line is that I was not able to fix the problem without taking it to the dealership since they have the special console to reset the idle speed.

arimaincorp

Sbg....did you tell the dealer the TB was messed with? I have the same problem. Tried all the resets and all, and no luck. I'm going to bring it in to the dealer, should i let them figure it out or tell them straight up i messed with the TB? Anyone have a preference with koeppel or Star Nissan in NY. thanks

VQP0WER

If it is not under warranty, I'de tell them you messed with it so you don't get charged for them diagnosing something you know is not the issue.

If it IS under warranty, I would keep my mouth shut.

arimaincorp

Is it still under warranty? I got it in Nov.02 new, it has 72,000miles on it.

irish44j

iTrader: (38)

ok...and we're done here.