Throttle problem!!

[ramzisleiman]

My 2003 2doors G35 recently had this annoying problem in the throttle! As im cruising, suddenly the revs cant go over 1200 rpm's and the slip, brake, and check engine lights show up!.. no matter how much i press the pedal.. the car just wont move! I tried another ECU, and changed the throttle sensors as a mechanic recommended, but none turned out to be the solution! anyone had this prob before or can help ?

[tollboothwilley]

could this be VDC?

what times does this happen? can you be more specific?

just on highway at high speeds? constant speeds? totally random? On turns?

[ramzisleiman]

totally random, it happens stays for an unspecific time, sometimes stays for long, It dosn't work unless we shut the car down then turn it on several times.. (several times = 10 to 100) seriously... we also tried unplugging the ecu (while the car was off) and it was still stuck when we turned it on!

u said maybe VDC! what might be its prob? and how can it be fixed?

[Jacko3]

Before disconnecting the battery, go to autozone and ask them to do a read out on their hand held computer to determine the code the car is throwing. They will give you a read out and print. this service is free.

After that, and while at autozone. Try disconnecting the negative terminal of the battery for 10 minutes and then reconnect it back and see what happens. Turn the VDC OFF.

After that, while you are there at autozone, ask them to check your alternator and see if it has enough voltage. If the alternator is bad, then you must replace the alternator and the battery at the same time. Maybe your alternator is bad or weak and so the G is compensating for the limited voltage or limited power being prodced by the alternator. The g was built with a lot of fail-safe mechanisms. The throttle is a drive-by-wire system that requires very specific and targeted levels and quantity of electricity to function at all RPMs. If the G has not died, then the problem is probably a small one. I would be surprised if it was a big problem. Let us know how this goes.

Just my 2 cents.

I love this bunny.

[Sentientbydesign]

Have you recently changed your tires or wheels?

If you vary the ratio between the wheels, the VDC will go into a sort of failure mode and the lights you mentioned will illuminate. Low brake fluid or possibly a faulty speed sensor might also cause this problem.

We have a couple of techs on the forums. I'll see if I can get one of them to help you diagnose your problem.

[fbpem1]

Have you recently changed your tires or wheels?

that will only disable the VDC and cause it to constintly cycle when you hit the brakes.

We have a couple of techs on the forums. I'll see if I can get one of them to help you diagnose your problem.

Hey how ya doin.

Its gonna end up being a code PO221, 222, or 223. You are needing a throttle chamber its fairly cheap to get done. Common problem. You need to pull the code and try with a GOOD throttle chamber if you change the throttle chamber you must have a closed throttle position learn, and idle air volume learn done or it won't work correctly. Also with an 03 i believe VIN registration must take place when you replace the ECM with a new one, i can't remeber for certian, but thats bad as well.

Throwing parts at a car without having a point to go off of is not a good idea, its a waste of money and time it must be diagnosed for the correct repair.

Step 1 get the code give me the number and i will get it figured out for you.; Most liley its pointing to a throttle chamber, BUT there is soome odder things it could be like a ground issue, but we will address that once you tell me the code number it is.

[SteveTheTech]

I really agree with Fbpem1 it totally sounds like a throttle sensor failure. Although given your location I really think this may be more of a PITA. Indeed you will need to have the idle volume set and self learning reset.

This is only an assumption based on your symptoms stated in the OP. Although there are other things that would cause the Slip,VDC, and Brake light to come on the Throttle chamber is link via the CAN system to the ABS control unit and will put ABS and VDC into fail safe mode.

Good Luck keep us posted.

[ramzisleiman]

Guys i will check for the code tomorow! but as i remember the diagnoses gave us that the problem is in the throttle body!.. and we changed the sensors! it still didnt work! I guess they were 2 sensors! one at the paddle and another at the engine. I will give you more information tomorow i hope. PS: in my country, the nissan company couldnt solve the problem! so imagine how weird can that be!!!!

[SteveTheTech]

I don't know how or what they did with your car as I do not know what experience they have and even what type of cars are available in Lebanon. If you have any local links I would be interested in seeing what models they have that use similar components.

Normally the replacement of a throttle chamber requires the removal of the unit with the 4 allen bolts and unplugging the green connector. This is after removing the intake tubing. Installing the new one and resetting the base parameters using the Consult II.

If I knew what diagnostic hardware you were using I might be able to help you a little more. I will look into this and let you know if I fund anything and if you have any information that you could share in regards to what Nissan diagnostic tools they have it may help us help you.

[Jacko3]

On my last visit to my technciains shop, he had replaced the throttle body of a 2003 350Z. He said the throttle body sensor was toast. Who knows, it could be the same problem. I have no idea.

[4drmadness]

the code i got is P2135. I went to the dealership and they were like most likley its the throttle body. they told me to put back the stock intake, i have the pop charger on. they said the stock intake would not void warranty and it would be easier for relearning idle. does that seem right?

[SteveTheTech]

Despite how you guys may feel about it any modification is no longer a warrantable item. So if they want you to put your car back to stock to receive warranty service they can indeed do that.

[4drmadness]

ok cool.

[zozoka1212]

Before disconnecting the battery, go to autozone and ask them to do a read out on their hand held computer to determine the code the car is throwing. They will give you a read out and print. this service is free.

After that, and while at autozone. Try disconnecting the negative terminal of the battery for 10 minutes and then reconnect it back and see what happens. Turn the VDC OFF.

I don't think there is any Autozone in Lebanon.

LOL

zozo