Tarzan

My car is in the shop and they cannot start it as it throws P0340. The mechanic says that he is reading 10V at both front and rear CPS sensors instead of 1-4V which is supposed to be there. Anybody had experience with that? Is the ECM fried?

04maximas

its a possibility as the computer provides voltage for those sensors to check for a short to a 12 volt wire, unplug the pcm and check voltage to the sensors if they now read 0 volts ya need pcm, if they still show 10 to 14, tear apart the harness

Tarzan

I get a feeling that after the engine drop for the chain tensioner replacement my IACV decided to short and fried itself and the ECM. I should have done IACV bypass a long time ago and procrastinating that is now going to cost me big $$.

Costee

Does the 6th Gen have an IACV?

04maximas

nope its built into the throttle body

Tarzan

Oh, I was under the impression VQ35DE had an IACV. It's the thing on the tranny side of the engine with 2 hoses going in, no?

04maximas

is this what ya mean? if so than no that's the egr valve

04maximas

our cars use a electronic throttle body the motor on the side of throttle body controls the idle

Tarzan

So what could have possibly fried the ECU then? They dropped the engine, replaced the chain tensioners, put the engine back and started it. They said, it ran fine for about 20 seconds, until the mech touched the throttle pedal. Then the engine died and did not restart since. They said it ran fine, and when it died it was like turning it off.

Costee

Grounds?

Tarzan

Grounds fried the ECU? How?

Costee

Bad grounds can affect the coils and possibly the ecu. It's not also unlikely that the ecu got fried as a result of some improper electrical connection causing a spark. The tech might not own up to his negligence.

Tarzan

They re-did the grounds.

04maximas

yea but once the pcm is popped its popped.

Tarzan

If the ECU is fried, can only a dealer replace it? Does the ECU need to be coded to the VIN?

For now I am leaning towards trying to send it to be repaired, but I am getting responses that they might not be able to due to the possibility of water damage.

04maximas

any body can replace the pcm its behind the glove box. get a brand new one do not get a used one. they have to be programed to the vehicle and key

04maximas

the programming has to be done by someone who has a special computer for Nissan ya can google them

Tarzan

That is what I meant - the programming to the vehicle. I guess, I am leaning towards inspecting the ECU for water damage once they got it out, and if it is fried but with no water damage, then try repairing it, and if that fails, then the new ECU.

User1

Pull out the ECU and open it up. If it's fried, you'll see burns on the circuit board. I doubt it's your ECU, but you took it to mechanics who did god knows what to it. I replaced my fried 5th gen ECU with a used one from another member. Think I paid $20 bucks for it. Works just fine. I used NDSII and my laptop to reprogram the key. The ECU does not need to be "programmed".

04maximas

is that NDSII decently priced and if so where can I find one

Tarzan

What is in the key? Is there a transponder chip there? Mine looks just like a regular key, unlike my Honda Pilot's which is a key and key fob in one and has a chip.

04maximas

our keys have a transponder chip in them

04maximas

just curious what year is your maxima? ya never mentioned the year and its not in your signature

Tarzan

This is not a Maxima - this is a 2005 Quest I was talking about. Same engine, same tranny, same electronics, just fat and silly.

04maximas

yea they have a transponder key. heres the ebay link for verification

https://www.ebay.com/itm/X2-N104-Sen...ss!77379!US!-1

Tarzan

Oh, no, another complication to worry about. The shop initially claimed they had a Nissan specific computer, but now one of them mentioned they have no idea how to program the key.

Is it true that NDSII does not work with ELM scanner? Damn, that is what I have!

User1

I had thought about configuring NDSII for use with a bluetooth dongle but haven't gotten around to playing with it. I use the vagcom cable that came with my software as a kit.

https://www.obdinnovations.com/obd2-...tware-package/

Yep, even keys with no obvious, external RFID chip cover have them. I bought two of these and they programmed fine:

https://www.ebay.com/itm/NEW-OEM-Tra...72.m2749.l2649

Take them to Nissan, they will cut them to the exact profile using your VIN. My dealer parts lady is in love with me and cut them both for free, so I can't comment on the cost of a cut.

04maximas

I know Nissan charged me 225 for the key, cut and program when someone accidently trashed my keys at a fast food place, but im not gonna say who that was

Tarzan

Yeah, the shop is going to fix the ECU and I have to worry about programming my existing key only if they fail to fix the ECU. Then it would have to be a replacement.
I guess, I will buy a "dumb" reader in the mean time.

Who do you normally buy NDSII from? I see several sites who seem to sell it. And what version can program the key: Full, Light, Trial?