How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Jay Your Own Question
Jay, Nissan Technician
Category: Nissan
Satisfied Customers: 20059
Experience:  20+yrs experience with Nissan & Infiniti Trained & Certified.Currently still working for Dealer
Type Your Nissan Question Here...
Jay is online now
A new question is answered every 9 seconds

My 2004 Maxima goes into limp mode frequently, where it

Customer Question

My 2004 Maxima goes into limp mode frequently, where it loses throttle response and won't go over 2000 rpm. Sometimes if I shut it off, it will run normally on restart. It also has a "Weak throttle response" mode. Throttle body has been replaced four times, the last time with a new Hitachi. Also replaced accelerator pedal assembly. Each time a part was replaced, it ran fine for a while, but then went back.... Engine code involves voltage A ...voltage B...
Submitted: 1 year ago.
Category: Nissan
Expert:  Jay replied 1 year ago.

Hi, My name is*****'m happy to help you. During our conversation, I may be presenting you with different things to try, and ask you some Questions to get a better understand of the issue so I can answer your question properly. So stick with me to the end, and I am sure we should be able to get this issue resolved for you!

Do you have a Service Engine Soon light on when the engine is running? Do you know what the code number is ***** your getting?

Expert:  Jay replied 1 year ago.

If you are getting APP sensor codes, I may know what your issue is.

Let me know.

I also offered you additional service if you like. This way we can speak about your issue. It's another option if you would like to do that. Other wise we could continue here if you like also.

Customer: replied 1 year ago.
P2135 engine code
Expert:  Jay replied 1 year ago.

That is a Throttle Position code.

Where did you buy these throttle chambers you installed?

Customer: replied 1 year ago.
My mechanic put in remanufactured ones, I believe. I ordered the Hitachi from partsgeek
Customer: replied 1 year ago.
My mechanic also "repaired" the wiring to the throttle body wiring connector. I took it to him about 4 times for this problem
Customer: replied 1 year ago.
I have to go out for a bit. I will look for your reply and respond in about 20 minutes.
Expert:  Jay replied 1 year ago.

Oh, that could be part of the problem. After Market electronic throttle chambers never work right.

What was wrong with the wiring?

Customer: replied 1 year ago.
I'm not sure about the wiring.
It was my understanding that the hitachi was identical to oem.
Expert:  Jay replied 1 year ago.

No.. everyone thinks that, but they are not.

Can you find out what he had to repair as far as the wiring?

Customer: replied 1 year ago.
I believe he found it wasn't making contact at the connector to the throttle body and spliced in some new wire.
I was thinking it might be a good idea to replace that connector and wiring with oem, but my local dealer said he couldn't get it.
Expert:  Jay replied 1 year ago.

It was a problem with the connector?

Expert:  Jay replied 1 year ago.

I don't see connector issues to often on these cars.

I would see if you can get a throttle chamber from the dealer. When you get these reman Throttle chambers from auto parts stores, they use the OEM housing where it says Hitachi, but the internals are far from it.

Customer: replied 1 year ago.
I bought the hitachi new, or represented as new
Expert:  Jay replied 1 year ago.

where did you buy it? Can you return it?

Customer: replied 1 year ago.
it has been a while...don't know if i can return...many months
Expert:  Jay replied 1 year ago.

Yeah... I have seen cars come in to the dealer so many times with After Market electrical parts and had to put OEM parts in to correct issues like this.

I would say maybe around 6 months ago, a customer came into the dealer with a 03 Altima V6, where he replaced the throttle chamber and was still getting codes and couldn't perform the idle relearn. I looked at it, and saw it was after market. I put a OEM one on and took the after market one off, cleared all the codes, performed the idle relearn, and car has not been back since.

Is that the same code you keep getting?

Expert:  Jay replied 1 year ago.

I need to step out for a few. Can we continue this conversation on this in about a hour or so?

Customer: replied 1 year ago.
I'm not sure, only read the code once.
okay, later
Customer: replied 1 year ago.
The relearn seemed to work fine...
Customer: replied 1 year ago.
But this same problem for about two years.... sitting unused alot
Expert:  Jay replied 1 year ago.

Thank you for waiting.

How many times has it been to the shop for this issue? Has it been the same shop?

Customer: replied 1 year ago.
It was in several times:
1. Replaced throttle body.
2. Then, wiring
3. Replaced throttle body.
4. Much later, 4th time...did entire Nissan diagnostic proceedure...replaced throttle body.
Then, later, I bought and installed the new Hitachi.
Expert:  Jay replied 1 year ago.

So if the wiring and everything is good, then it sounds like it has to be the throttle chambers you are getting. Which does not surprise me.

How long does it normally take for the code to return once it's cleared?

Customer: replied 1 year ago.
When new parts (throttle body, pedal) were installed, it would run right for a while, maybe a couple of weeks. Then, limp mode and cel.
Last was new pedal....the more I have driven it since then, the more often it is limping.
But, still runs right sometimes.
Expert:  Jay replied 1 year ago.

Why did you replace the pedal? Did you have a code for it?

Customer: replied 1 year ago.
Guy at parts store who read the code for me said that was probably the pedal.
So, if I order a throttle body from Nissan and same problem persists after it is installed, do you think they will take it back?
Expert:  Jay replied 1 year ago.

If you have the dealer install it and do the relearn, you have a 1 year or 12 mile warranty on the part and labor. So if the dealer was to look at this, and replace the throttle chamber for you, they would then be liable for this if the code returned.

But I know the dealer is expensive. But if the issue continues, wiring would need to be checked, and it could possibly be a Ecm issue.

Customer: replied 1 year ago.
Yeah, I have been concerned about the ecm/ecu possibility...expensive.
After the second throttle body, I took it to the dealer. He said, "no problem, we will just reprogram it." $150 later, "your car is ready." Couple weeks later, same problem. Dealer say, "hey, not my fault, reman throttle body." So, I guess I need to find the next closest dealer...
Expert:  Jay replied 1 year ago.

See, they blamed the throttle chamber also. I would get a throttle chamber from the dealer. Have the idle relearn done and go from there. After Market electrical parts can't be trusted to work properly

Customer: replied 1 year ago.
Engine lists these possible causes for P2135 for '04 maxima:
- Faulty Electric Throttle Control Actuator (TP sensor 1 and 2)
- Electric Throttle Control Actuator harness is open or shorted
- Electric Throttle Control Actuator circuit poor connection
- Faulty Accelerator Pedal Position SensorRead more:'m not seeing the throttle body, but I do see wiring and pedal. It is triggered by variance in two TPS voltages. Are the throttle position sensors in the throttle body?
Expert:  Jay replied 1 year ago.

The throttle chamber has all those tp sensors built into it. That link is incorrect to say that the accelerator pedal is part of the issue. This link I am giving you is right out of the factory service manual.

You need to start by replacing the throttle chamber with one from the dealer.

Customer: replied 1 year ago.
Is the wiring connector that connects to the throttle body available from the dealer already wired up? If so, I think I'd like to replace it before I take the car for service? Can you get me a part number?
Expert:  Jay replied 1 year ago.

It is not. It would only come with the whole EGI Harness. If you would like to replace that connector you would need to go to a salvage yard and snip it off a old harness.

If you have any more questions on this, please feel free to ask.

If not, and you're satisfied with my help, please Rate me. I hope I have provided you with Excellent Service.

Thanks Jay!

Customer: replied 1 year ago.
Thanks for all your help, Jay.
OK, I looked into the "rewiring" that my mechanic did. I removed the electrical tape that he applied from the connector at the throttle body to about 4 or five inches back. It looks like all of the wires, I guess six of them, are bundled in a ridged plastic "conduit." Then, inside of that they seem to be bundled in pairs inside of typical plastic insulation, with each member of the pair in its own colored insulation (green, yellow, etc).But, without stripping back that outer insulation any further, it looks like there is bare silver-colored wire, maybe braided, wrapped around the pair within that outer insulation, perhaps for shielding? This has just been jumbled up , leaving the last inch or two from the connector uncovered. It looks like this shielding wire from one pair would have been contacting that for another pair inside the tape he wrapped. Would you just tape it back up, wrapping all six as he did? would you try something like aluminum foil, or perhaps braided wire (from where, hardware store?) to rewrap the pairs and tapre them in pairs before taping the whole thing back up?
Customer: replied 1 year ago.
I bough a scan tool and I also have these codes: P0123, P0223, for high input voltages on A and B of TPS/pedal. And P1122
Customer: replied 1 year ago.
yep, sure looks like shielding. But must have terminated somewhere before connector, because the wires cross each other before it.
Not three pairs of wires, but a one (green, black) a pair, and a trio).
Expert:  Jay replied 1 year ago.

I will be online later this evening..

Customer: replied 1 year ago.
I wrapped each of the three bundles in Al foil and covered with electrical tape. Reset the ecu/ecm; normal operation for two days, about 6 trips of a few miles to twenty miles.
Recently it had been limp mode most of the time.
Expert:  Jay replied 1 year ago.

You redid the shielded wire on the harness and it seems to be good?

Customer: replied 1 year ago.
Well, like I said, I wrapped them in foil and electric tape.
But, who a few days I may be back where I was.
Might be just unplugging and resstting that had effect.
Customer: replied 1 year ago.
It seemed every time a fix was applied (replace throttle body or pedal) it would be good for a while and then degrade.
Customer: replied 1 year ago.
Odd thing is I can see any splices or other fixes he did, he just peeled back the shielding as far as I could tell.
Expert:  Jay replied 1 year ago.

i do know of some throttle issues. but normally it sets App codes. Lets see how the repair works out and let me know..

Customer: replied 1 year ago.
ok, will do.
Would you think peeling back that shielding wire for a couple inches from the coonector would have any effect?
Another odd thing was a LOT of like...silicon gel inside the connector. Conductive paste maybe? I scraped it out with screwdriver blade.
Expert:  Jay replied 1 year ago.

That silicone keeps everything tight together with in the harness.