eccs 2 fuse? twice in one week

[Km1ll3r91]

So twice this week my eccs 2 fuse has blown, I can't figure if its while I'm driving iassuming its while starting it happens. When it blows the truck just turns over n over, then replace it n the truck starts just fine.

Any ideas and help is appreciated

[4xq]

Read this link: http://www.justanswer.com/nissan-infini ... olled.html

I think this may be your issue.

You need to replace the Idle air control valve and the ECM at the same time. There are places on the internet that can repair the ECM, so google around.

[4xq]

Happened to be looking on ebay for something and found a company "myairbags" that does ecm repair for 82.00. Free shipping. Don't think it will get cheaper than that.

They repair a lot of other electronic auto stuff as well. 98% positive ratings. Just an FYI.

[Km1ll3r91]

But would the truck still run fine if this is intact occurring the p0505 I mean the similarities are scary like the burnt smell, and hard start, but OE the truck is started it will run normal just fine. It still starts every time the past couple days since posting. It does take a few attempts to start.

[4xq]

Are you saying you keep getting a P0505 code now? Are there any other codes?

In your first thread, you were having to keep the truck running with the gas pedal. Is it idling ok now?

[Km1ll3r91]

Yeah since my first post I have changed the crank sensors, I only just acquired the truck n luckily have another vehicle. I changed the crank sensors which settled a lot of the problems I was having, then the fuse was blowing but has also seemed to settle as well, I won't be surprises if it blows again. How ever the only problem I'm having right now is that the truck takes a few attempts to start.

I haven't had an oppertunity to check the codes lately although I'm thinking about running to advanced auto real quick to check. My mechanics been so busy he hasn't been around lately.

The cel is on tho.

My main question right now is do you think with the bad iacv and/ or ecm fried the truck could still be running and driving the way i m describing?

[Km1ll3r91]

Also I do have to give it some gas and for the first few seconds help it along then it will idle ok after that

[Km1ll3r91]

So I did go to auto zone and fond the p0505 code, good call 4xq! I now have some more researching todo so any info is appreciated looks like I'll be replacing the IAC and ECM hopefully the ecm can be repaired as you listed

Thanks again man you've helped me a lot I owe you one

[4xq]

Ok, you can replace the IACV (idle air valve) with a new one first if yours turns out to be bad, and see how the truck runs. If the ECCS fuse still blows you will need to get the ECM repaired. The ECM will not harm your new IACV.

You might want to think about a cheap code reader that will reset codes for you: http://www.amazon.com/Universal-Can-bus ... ode+reader

Under 20 bucks.

You also need to clean your MAF with some MAF or electrical contact cleaner. Sometimes a dirty MAF can contribute to the problem where the engine stalls shortly after it starts.

Thanks for the thanks!

[Km1ll3r91]

Do you know about the key reprogramming and idle relearn? I suppose if only repairrepair the module and that is successful then the keyswont need reprogrammng , but the idle relrelearn. Can year be done by myself or do you have to take the car to the dealer?

Also what does the dealer charge for these services?

[4xq]

Your key will still work fine if you have your own ECM repaired. If you buy another ECM, then the key has to be reprogrammed.

You can do the idle relearn yourself. The factory service manual is here: http://www.nicoclub.com/FSM/QX4/2001.5_QX4/

Idle relearn is in the EC section. You can download all those. Lots of info on the Pthfinder in this thread: pathfinder-qx4-general-information-and-q-a-t549378.html

You may want to call the dealer and see what recalls need to be done on your car. There is an airbag recall I think will apply. Those get done for free of course.

[Km1ll3r91]

Thanks yeah from own research I've found that thread as well, I have heard mixed opinions about sending ecms out to be repaired because the either egt the chip wrong or other damagenisdone the board, I am willing to trying it, to save some money only afraid it will costmore in the long run,

Have you heard anything about people successfully repairing ecms?

I find it so strange that my car has a bad iacv, and fried ecm, yet still runs and starts fine 99% of the time, I wish I cold contact others who have had this same issue!

[4xq]

Your symptoms when you started your other thread were smoke from under the dash, ECCS fuse burned out twice, and you couldn't keep the engine running without using the gas pedal or it would die. Those do match the thread about the IACV burning out the ECM.

You have replaced the crankshaft sensor, and said your engine now seems to run and idle ok, but you stll have some starting problems- hard to start or dies shortly after starting. You also have code p0505 which is the idle air control valve.

I am saying go fix p0505, and clean your MAF which may help your starting issue. Then you can see how it goes with the ECM. Do not do anything with the ECM until you have fixed the p0505 and cleaned the MAF.

You MUST fix p0505 first before you can tell whether the ECM will still burn out fuses. I suppose it is possible you got lucky and the ECM will be OK after p0505 is fixed. As I said before, a new idle air control valve will not be harmed by the ECM.

Start there and let us know what happens!

[Km1ll3r91]

Yeah I appreciate all the Information, I did decide to order the iacv from rock auto the intermotor version. Hopefully everything goes well until then, I was reading on a topic that was about a maxima and they said that there are 4 coils in the the IAC sensor and sometimes only 1 shorts out so it can still get a reading, so I suppose things are looking up, I will have to get the ecm fixed at some point, however I don't think much will change once the iacv is changed because the 1 coil shorted out the corresponding MOSFET in the ecm, therefore the ecm cannot do any damage to the iacv, hopefully

[4xq]

Ok, you are pretty much right on it I think. Might post a link to that maxima thread - sounds like there may be some good info in there.

If you are correct about the MOSFET being toasted, and you very well may be, then I don't think you need to worry too much about an ECM repair - all they will end up doing is soldering in a new MOSFET. Something you can actually do yourself if you are a bit adventurous and you know what part to replace.

Everything I have read says the IACV will not be damaged by the ECM as it is the IACV sending signals to the ECM. The ECM just cannot correctly deal with those signals because of the toasted MOSFET.

Doesn't sound like you need help from me - you have done your research well.

[4xq]

Went over and took a look at EC-417 here: http://www.nicoclub.com/FSM/QX4/2001.5_QX4/ec.pdf

If you look at the small arrows, they show voltage supplied from the ECM relay to the IACV on pins 2 and 5. The diagram shows the four coils you were referring to. You then follow each of the four wires from the IACV to the ECM. If you know which coil in your IACV cooked ( either by ohms test or by opening it up and looking at it), you can follow that wire to the correct pin on the ECM. That would allow you to tell which MOSFET in the ECM is involved.

If you come across something with some photos of a MOSFET being replaced in the ECM, maybe you could post the link. I would like to see that myself - I have not found that in my reading.

[Km1ll3r91]

I did pul the ecm a few minutes ago, and man did it stink I got a couplepics n video I might upload but basicly the chip blew a whole in the center of the chip I can't read the part number on the code hopefully I'll be able to find that I believe its sta509a but not positive I only rad that off the maxima thread im going to try and replace it myself or find a friend to help, cannot believe I've been driving my car like this!!

[Km1ll3r91]

Also I just ppurchased off eBay the sta509a chip so things are e INA motion

Do you know will instill need to perform the idle relearn? Or only if the car doesn't idle post repairs+

[4xq]

I am impressed! Very few people have the guts to do an ECU repair. Too bad this all happened right after you bought the car. I guess thats the way it goes sometimes.

I think you can probably find some video on Youtube that shows how to do the repair - might help you on soldering techniques if you need it.

Pretty easy to spot the problem in the ECM when theres a chunk blown out of the chip. Do you see any damage to circuit traces around the chip? Or other damage to the board?

Just a thought but you may want to check the wiring going to the ECM under the dash and make sure you didn't melt any wiring insulation.

Yes, you have to do the idle air volume relearn on EC-57 / EC-58 when you get it back together.

Keep us posted!

[CanuckQx4]

Could you please post the pics you took of the inside of the ECM KM? I aswell have this issue and am going to be sending my ECM out but Id like to be sure mine is even toasted in the first place. I bought a new IACV off ebay for $110

[Km1ll3r91]

Im not so sure how well undertaking the soldering job will go, I may hit up a local computer repair shop for some help, however this all sorta fell into my lap n I feel I have no other choice at this time but to under take it,

I notice there isn't ,much coverage on such a seeming huge problem, it makes me want to share my expirence and how I plan to fix this problem,

The ecm was super simple to get out only 3 nuts and it can only go back in 1 way, once out 4 screws to open her up and at that point it was blatenly obvious which chip had fried, I even made a video for myself I will try n upload it along with the pictures or just share my drop box folder with you guys,

This is the easiest way for me to share the amount of ipictures and videos the last video is the only worth watching I didn't notice unlike now I took some junky pics but you can get the idea

https://www.dropbox.com/sh/gzuwyze2f04g ... mpN8a?dl=0

Let me know if you have any trouble viewing and I will fond an alternative way to upload

[CanuckQx4]

Thanks for the pictures, I found a company on ebay that will do the repair for $82. Pretty nice deal I think, I dont have the skill or the machine to solder such an intricate board

[Tonench]

I'm sorry to backtrack you but you're the only person who has done JDM 3.5 swap and I just need to know how you got your crank sensor to workdid you use the pickup from the flywheel or did you use the front crank pulley, again I'm sorry to get off topic but you're the only person right now who I think can help me

[Km1ll3r91]

My engine isn't a JDM swap its def stock usdm as far as the crank sensors I just replaced with aftermarket crank sensors from a local auto parts store, I forget the brands but can find if need be

[Tonench]

Its canuck I'm trying to get a hold of ...I dont know why I can just private message him but he's done a JDM swap like me .....I already replaced the sensor it didn't work still shows a 63° spark advance

[Rotoroff]

Truck is stuck on street not starting and IACS tests OK for Ohms (22.7 on all 4 coils). While I wait for new MOSFET STA509A does anyone know if the truck would start if I just removed the burnt STA509A from the ECM? That way I could get it back home.
P.S. Just last year the local dealer replaced the throttle body assembly and ECM with used units for the same symptoms!
Cheers

[Blindaviator]

Its canuck I'm trying to get a hold of ...I dont know why I can just private message him but he's done a JDM swap like me .....I already replaced the sensor it didn't work still shows a 63° spark advance

I did some research on JDM engines before I ended up swapping the engines in my 2001 (not a JDM swap).

What I found was that the 2001-2002 JDM engines are slightly different than the 2003-2004 versions. Most notably the sprocket on the end of the camshafts for the sensors were different. They apparently have a different gap between the teeth which will throw the timing off. If you still have the old engine pull the cover off the end of the camshafts on both engines and compare them.

Check out this link for some help:
01-pathfinder-3-5-swap-to-03-jdm-3-5-no ... 14604.html