Nissan high idle, P0507

[LeakySeals]

The 03 Nissan Maxima in my sig keeps tripping a P0507 code. The idle is around 900-1k. I don't mind it but the CEL will prevent me from passing inspection. So far I replaced the PCV, its hose, cleaned the TB and MAF, performed the Nissan idle relearn procedure. Works for a day or 2 but slowly the idle creeps higher again. If I step on the brakes its firm and there is no change in idle. so I think the booster and its hoses are ok. The IMG and plugs were replaced last year. Anyone have suggestions what to try next?

 

[WyrTwister]

Does this engine have an idle air control valve , or is it too new ?

Does it have a throttle position sensor ?

Any other vacuum lines that may be leaking ?

 

[charbaby]

IDK!
Seems to the IAC valve???

 

[JustN89]

Try doing an idle relearn.

1. Get it up to temp.
2. Turn key to "on" position for 3 seconds
Turn key to "off" for 10 seconds
Back to "on for 3 seconds
3. Repeat step 2 three times.
4. On the last turn of the key to the "on" position, after the 3 seconds, depress the gas pedal 5 times rapidly (within 5 seconds)
5. After depressing the gas pedal 5 times, wait 3 to 5 seconds then depress the pedal again and hold for 10 seconds (the CEL should start flashing)
6. Keep the gas pedal depressed until the CEL remains solid, then lift off the pedal.
7. Start the car.

 

[charbaby]

Youtube on the idle relearn:

https://www.youtube.com/watch?v=vT4GnKuFKrg

 

[The Critic]

These cars can be extremely difficult to relearn the idle. I have resorted to the following techniques (in no particular order):

- Painting the throttle body with paint to slightly reduce the throttle opening when closed. New throttle bodies from Nissan/hitachi will have paste near the pivot point of the plate to provide the same effect

- Unplugging injectors or stuffing items into the intake to reduce idle speed enough so that the idle speed relearn can complete.

- Replacing the throttle body

- Reflashing the ECM to the latest calibration. Sometimes versions of the ECM have glitches which will prevent the relearn from taking.

- Replacing the ECM. We had an older 350z from this era which required a new ECM. Apparently there was an internal issue with this ECM which was preventing the relearn from taking place (even after it was reflashed).

Basically, I highly recommend against cleaning the throttle body on Nissan vehicles (especially the V6 from the mid 2000s era) if it can be avoided.

 

[14Accent]

It's almost always the IAC on those. Nissan had issues for years with the IAC coils shorting and burning out the drivers in the ECM.

 

[LeakySeals]

Originally Posted by WyrTwister
Does this engine have an idle air control valve , or is it too new ?

Does it have a throttle position sensor ?

Any other vacuum lines that may be leaking ?

It has a modern TB with integrated TPS. I've replaced all the ones that look sketchy.

 

[LeakySeals]

Originally Posted by The Critic
These cars can be extremely difficult to relearn the idle. I have resorted to the following techniques (in no particular order):

- Painting the throttle body with paint to slightly reduce the throttle opening when closed. New throttle bodies from Nissan/hitachi will have paste near the pivot point of the plate to provide the same effect

- Unplugging injectors or stuffing items into the intake to reduce idle speed enough so that the idle speed relearn can complete.

- Replacing the throttle body

- Reflashing the ECM to the latest calibration. Sometimes versions of the ECM have glitches which will prevent the relearn from taking.

- Replacing the ECM. We had an older 350z from this era which required a new ECM. Apparently there was an internal issue with this ECM which was preventing the relearn from taking place (even after it was reflashed).

Basically, I highly recommend against cleaning the throttle body on Nissan vehicles (especially the V6 from the mid 2000s era) if it can be avoided.

So is the relearn whatever the current idle is when started immediately after running the procedure? Which is why you are removing the injector power to lower the idle?

 

[The Critic]

Originally Posted by LeakySeals

So is the relearn whatever the current idle is when started immediately after running the procedure? Which is why you are removing the injector power to lower the idle?


If the idle speed is out of spec, the idle air volume learn procedure needs to be manually performed. The process is best initiated using a scan tool. However, sometimes the procedure will "fail to complete" and the idle speed remains out of spec. Techs have found that disconnecting injectors, blocking off intakes, etc will lower the idle speed enough to allow for the relearn procedure to be completed. When you use a scan tool, the idle air volume relearn procedure is fully automated; you simply click start and the process completes itself.

 

[Trav]

Check the flex pipe from the MAF to the throttle body along with any hoses that may be connected to it, look for cracks or splits, make sure the clamps are tight. Check for vacuum leaks. Fuel trim data?

 

[LeakySeals]

I can get some live data. Assuming it needs to be warmed up? Also I did find this looking between the MAF and TB. Is this the boot / flex pipe that you were referring to? I tried spraying it with carb cleaner. no change in idle but it's clearly cracked.

 

[Trav]

Yes that's it. That is not healthy, change it regardless. Check any hose(s) going to that and any vacuum hoses for cracking or looseness.

 

[LeakySeals]

The brake vacuum hose with a one-way valve inside of it is loose even with the clamp. There's no fade in the brakes. The engine doesn't change RPM. But it looks like I have a half inch to cut the end off. Will do that see if it helps. Going to try that relearn trick again. The check engine light flashes so I think I'm getting it right.

 

[Trav]

Take care of what you know or suspect is hosed than do a relearn. Don't get the cart before the horse.

 

[macdole99]

i just finished this job on mine was the iacv i just changed it. i tried the manual relearn but it wouldnt take so i downloaded nissan data scan software for 7.49 from the play store and did the relearn thru there worked so far.

 

[LeakySeals]

Originally Posted by Char Baby
Youtube on the idle relearn:

https://www.youtube.com/watch?v=vT4GnKuFKrg


I have the known bad boot on order. In the meantime I kept trying this and was finallt able to get this to work. It flashed for a bit and then went solid I let off the gas and started the car and it dropped down to 713-730 from 900+ on live data. The key was making sure it was hot to the point the fans were going. The fact that it's 65 f in New England right now may be another contributor to the success. But I have a feeling it might return I guess we'll see.

I have live data juat to write it down. What's strange is the ltft stays constant at 9.4

 

[The Critic]

Here is another data point.

2011 Rogue with 110K. During the initial test drive I noticed that the idle would fluctuate at stoplights with the a/c on. For giggles I decided to check the throttle body and of course it was dirty. I cleaned the throttle body and restarted the car. Within 15 seconds the idle stabilized at around 1500 rpm and it set a P0507. Using my Autel, I performed the idle air volume relearn. It took about 30 seconds for the idle speed to come down to the specified 700 rpm.

So, if you of any major cleaning of a Nissan throttle body you can plan on needing to do a relearn.

 

[LeakySeals]

Originally Posted by The Critic
Here is another data point.

2011 Rogue with 110K. During the initial test drive I noticed that the idle would fluctuate at stoplights with the a/c on. For giggles I decided to check the throttle body and of course it was dirty. I cleaned the throttle body and restarted the car. Within 15 seconds the idle stabilized at around 1500 rpm and it set a P0507. Using my Autel, I performed the idle air volume relearn. It took about 30 seconds for the idle speed to come down to the specified 700 rpm.

So, if you of any major cleaning of a Nissan throttle body you can plan on needing to do a relearn.


Thanks. It's over 700. Between 715 - 730 on live data. Do you think that will be enough to keep it away?

 

[The Critic]

The diagnostic info on prodemand says that the fault code is set whenever the idle speed is not within range.

For A/T it is 625-725 rpm. For M/T it is 575-675 rpm.

If you have an AT, then it is probably good enough. For some reason Prodemand did not list the target idle speed, but I would estimare it to be 675rpm on an A/T.