Limp mode from MAF

Buy the BMW Scan tool from Xcar360.com and try to read it. If you can't, well then at least you have it to use in the future. If that thing can't read it, then your computer is gone. You'll have to buy a new unused DME.

EDIT: Saw your reply while I posted...


The ICV may be new, but if that's the code it's giving you, check to make sure it was installed correctly. I mean take it off and reinstall it properly after inspecting it for damage. I'm curious as to why you would ignore what the code tells you directly? The computer knows the position of the valve, so it knows if it's not moving anymore...

Originally Posted by Weste46

The codes CAN be pulled now, I fixed that issue, sorry for not saying that. The only code that appears is a P1500, which is ICV stuck open. the ICV is new however. The MAF has been replaced, and I know is not the problem, im not sure how to change the title of the thread.. it's not the ICV or MAF, but seems to have to do with both, and is NOT used while in open loop mode.

Thanks!

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ICV stuck open is a problem that can give the symptom you describe.

Your car is able to tell you where it hurts, you have to look at the stuff it thinks is wrong before you start to build a list of other things. If the ICV is new, then you have to figure out if it works, or if the connection is jacked, or whatever. The car THINKS the ICV does not work, and you have to make it know that the ICV does work.

I have the BMW 1.4.0 Scanner, it does not pull codes even when soldered correctly, only programs for DRL, etc. The reason I thought the ICV was okay was because when the MAF is unplugged the car runs fine. I assumed if it were a bad ICV, it would give me problems with or without the MAF. I was hoping the P1500 was too generic of a code, and that it might not REALLY mean ICV stuck, but rather something relating to it. I can always try again, but it would have to be the connections.. I highly doubt this is the case however; bumps in the road never invoked the limp mode, it just happened more and more frequently until now, seeming to be a sensor malfunction. I will check into the ICV one more time (I've been in there 3 times now) and report back, though I have low hopes for the outcome.

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You likely have a bad vacuum leak, which causes the DME to think the ICV is stuck open??

Vacuum leak could also cause MAF codes as well.

Check the simple stuff first.

See the first link below in my signature for ideas.

Originally Posted by Weste46

I have the BMW 1.4.0 Scanner, it does not pull codes even when soldered correctly, only programs for DRL, etc. The reason I thought the ICV was okay was because when the MAF is unplugged the car runs fine. I assumed if it were a bad ICV, it would give me problems with or without the MAF. I was hoping the P1500 was too generic of a code, and that it might not REALLY mean ICV stuck, but rather something relating to it. I can always try again, but it would have to be the connections.. I highly doubt this is the case however; bumps in the road never invoked the limp mode, it just happened more and more frequently until now, seeming to be a sensor malfunction. I will check into the ICV one more time (I've been in there 3 times now) and report back, though I have low hopes for the outcome.

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YOU NEED TO PULL CODES. Sheesh!

How do you know you have a P1500 today if you cannot pull codes TODAY to see why the Check Engine (SERVICE ENGINE SOON) light is on? Holy crap, you said you have a code, this means you have a scan tool that does the job of pulling codes.

What in your universe is Limp Mode? I know what limp mode is, but the stuff you are looking at should not invoke it. And if the car is in limp mode, then the Check Engine light should be on, and you should be using an OBD II scan tool to see why the light is on. YOU CANNOT ASSUME ANYTHING. Even if you know the code earlier was P1500, there is no way to know that the same code is coming up today.

I cleared my codes a while back, plugged in everything and when it went into limp mode again I immediately turned it off and pulled the codes and received P1500. That is all. I appreciate your help but some of your not reading my full thread, or at least not clearly enough.

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My limp mode issue is shown through a yellow eml, traction control, and brake light.

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Mine is the same issue , ordered a new ICV , will post more info after installed ..

Make sure you do not have a battery or charging problem.

See signature for Hidden OBC Menu and monitor battery/charging Voltage on the dash.

You would be surprised what may actually cause limp mode and multiple dash lights!

Are you saying this could be caused by an alternator failure or a bad battery ?

Alternator and battery were changed within 20k miles, I will try the dashboard thing if I can figure it out! Any links for that?

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jfoj, I apologize, I'm on bimmer app, I didn't realize you said it was in your sig. I'll check it out!

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Wes, I am having same issues. I have 2001 330Ci born date 7/2000 it has the newer obdII below steering wheel. I had to have my key in position 2 for it to read my DME EWS etc...I may have overlooked it but have you tried to run the scanner in position 2?

With my MAF disconnected my car will start and idle around 1000rpm; connect MAF it dies. Ran the BMW scanner 1.4.0 and it shows:

DME -> 35/74 - Idle speed control valve, opening coil, open circuit
1B/74 - Idle speed control valve, closing coil, open circuit
08/B2 - Air mass flow sensor signal, short circuit to negative or open circuit

I just put my vehicle back together from OHFG/CCV/up-low intake boots/belts so I will go back in to check to see if I did not hook up ICV plug correctly(I did clean it out/was stuck).

Hopefully position 2 will show you the information. Keep us posted.
Thanks.

Yours sounds like a bad connection to the ICV, and the MAF open circuit is from your MAF being unplugged! It just stored that code when you did it I'm sure. You are correct on the position two being the issue! I was dumb and thought position 1 worked before. I can now scan, but my 1.4.0 is the new version, with pins 1 soldered to 2, and pins 7 soldered to 8, it still won't open the DME module. So I still have a generic code.. P1500 from an Actron reader.

I will check the ICV connections now. this intrigues me a lot. Does anyone know of a way to troubleshoot the ICV connections?

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Love2drive, I would love to see what generic codes your code would throw on a generic reader. Maybe if the bad connections throw a P1500, that's my issue? Please report back if you do get generic codes pulled as well!

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Weste: It is not because the PAsoft is the new version that it wont read everything. You need to make sure that the scanner is plugged in tightly and evenly on all connections. It often does that to me. I have to take it out and replug it multiple times. FYI/

Weste46

actron CP9125 code reader(cleared after each reading)-
MAF unhooked:
P0102---MAF
P1504---ICV
P1508---ICV

MAF hooked up:
P1504---ICV
P1508---ICV

I did not get a chance today to check the connection to my ICV.

I looked up P1500 it shows something different--
P1500--Fuel Pump Relay Circuit Electrical Malfunction

I think you can swap the relay with horn/not sure someone will chime in to confirm.

Let us know.

I would like to know as well bc this is just so aggravating .. I have done everything so far from cleaning .. I ordered my ICV and will install it as soon as I get it .. Keep u guys posted

Thanks for all the help everyone! I will try my scanner again, I read somewhere that the newer versions don't open the DME module however.. and I couldn't multiple times. But I'll absolutely try! When did you get yours?

Love2drive, ive heard this before, that would be awesome if that's the case! where is that relay?

Everyone, keep your issues updated here as well! If you solve yours, update!!!

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Found where the relay is here:
http://www.bmwgm5.com/E46_Relays.htm
I'll try after work!
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