Update....

wasn't even able to pass the causeway...

i was suppose to take the car to my tuner, which is in a nearby country (around 50 miles drive) to have the car dyno tuned.

just after paying the insurance fees at our end of the boarder, the car went into limp mode (just like it did when tuning @ WOT), not accelerating (hardly drives). i plugged in my cipher to read error code, and again got the U1000, U1001. so the trip got cancelled because i don't want to risk it and drive it all the way there without knowing anyone to help me out if anything goes wrong. "i'm about to give up on the car".

my friend did couple of calls so we can try to find out what's causing this problem and what does the code refer to. we took it to his friend who got an OBD reader, but wasn't able to pull the codes because i cleared them when it died on me.

couple of chit chats with the guys in the garage, and everyone is suggesting something.. someone is saying, because the car is going boost, the ECU doesn't know what to do with boost, so it puts your car into safe mode. (am i running microsoft windows $hit on my car or what?).. well, what he's saying makes sense, only if i go into boost. and i never did.

someone else suggested i speak with a local tuner that can tune Haltech.. i said fine, since he's on his way to the garage, i'll wait for him.

the guy comes in, we sat and talked about the code and he suggested that the it's because of my tune.(i say it could be). and he suggested the easy way of trying to figure out the issue, get rid of the map on the ECU (return it to stock), and get SAFC or SAFC2 and he'll tune the car on the dyno/street.

if all goes well with that, then we can move to a different level of tuning.

that's where it ends..

sooo... on to the issue i'm facing with this:

-MAF is maxing out @ 5000rpm, but i never reached that range to cause a max out. but if i did, it could make the car go crazy.
-for the last 2 weeks, i was driving the car to work and back, and never got this error code. only yesterday when i did a little bit longer trip, it threw the code. which makes me wonder if it's heat problem (even tho every other indicator says my heat is in range/good).

-now, DTC U1000 and U1001 (CAN Communication Line) is described below (for Murano cars), but exactly to the letter on what's happening with me.

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Usually this ends up being a loose grounding bolt holding the ECM to the dash bar, causing the ECM to lose ground temporarily. Many with this DTC complained of hesitation, stalling or the engine holding a lower than normal RPM. For me, I was cruising at about 45 MPH, the engine dropped to about 500 RPMs, began shuddering, and the SES light came on. The engine did not respond to the gas pedal and at about 15 MPH it stalled. I got over to the shoulder and tried to restart but it did nothing. It was like when you try to start with a completely dead battery; no sound. But I had full electrical power since the lights/radio/air was on. 5 minutes later, it started back up as if nothing had happened. Check Engine light remained on, and until it was looked at by a mechanic was a bit hesitant during acceleration.
Had my mechanic retighten the various connections. He left SES light on (didn't clear code). That way if he didn't fix the issue, a dealer would have the code to go by (dealers won't take your word, they need the code). About a week later the SES light turned off and the issue has not returned.

TSB EC06-001A
Relates to DTC U1000/U1001

Description
"CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle multiplex communication line with high data communication speed and excellent error detection ability. Many electronic control units are equipped onto a vehicle, and each control unit shares information and links with other control units during operation (not independent). In CAN communication, control units are conected with 2 communication lines (CAN H line, CAN L line) allowing a high rate of information transmission with less wiring. Each control unit transmits/receives data but selectively reads required data only."

DTC Detecting Condition
-ECM cannot communicate to other control units.
-ECM cannot communicate for more than the specified time.

Possible Cause
-Harness or connectors (CAN communication line is open or shorted).

When an issue with the CAN arises (at least twice in one trip), it triggers the Service Engine Soon (SES) light on the dash.

TSB EC06-001A Actions
When this code is brought on by a grounding issue, these are the steps the mechanic will follow to remedy.
-Clean/re-tighten ECM ground connections.
-Clean/retighten negative battery cable body connection and battery post connection.
-If needed, clean and ensure good contact between the steering member assembly and the left side instrument stay assembly.

Quote:

<TABLE cellSpacing=0 cellPadding=6 width="100%" border=0 itxtvisited="1"><TBODY itxtvisited="1"><TR itxtvisited="1"><TD class=alt2 style="BORDER-RIGHT: 1px inset; BORDER-TOP: 1px inset; BORDER-LEFT: 1px inset; BORDER-BOTTOM: 1px inset" itxtvisited="1">Originally posted by vistokid
"Found U1000 Can Com code. This code is caused by ECM not getting proper ground. This is due to ECM is grounded through dash bar to vehicle body and bolts connecting dash bar to body become loose and ground is temporarily lost. Retorqued bolts and erased code light."

Charge:
Labor $89.95
Misc Charges $11.24



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Quote:
<TABLE cellSpacing=0 cellPadding=6 width="100%" border=0 itxtvisited="1"><TBODY itxtvisited="1"><TR itxtvisited="1"><TD class=alt2 style="BORDER-RIGHT: 1px inset; BORDER-TOP: 1px inset; BORDER-LEFT: 1px inset; BORDER-BOTTOM: 1px inset" itxtvisited="1">Originally posted by njjoe
I had the C1000 (same as U1000) grounding problem three years ago. The fix was simple (tightened a grounding bolt under the dash) and took less than an hour. My records show they implemented Service Bulletin #EC06-001a... I was a bit skeptical when they claimed all they did was tighten a ground connection, so they printed out the SB as proof. The problem never returned. It was repaired under the bumper-to-bumper warranty.



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Quote:
<TABLE cellSpacing=0 cellPadding=6 width="100%" border=0 itxtvisited="1"><TBODY itxtvisited="1"><TR itxtvisited="1"><TD class=alt2 style="BORDER-RIGHT: 1px inset; BORDER-TOP: 1px inset; BORDER-LEFT: 1px inset; BORDER-BOTTOM: 1px inset" itxtvisited="1">Originally posted by PearlMurano
I went to Nissan today and they checked the SES code. Turns out it was code U1000 communication failure, ECM ground failure. They removed the dash and cleaned contacts at ECM and harness and secured connections. All is going well so far. Seems to have fixed my problem. Tech said that the murano was well known to have electrical problems of this type.



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Sooooooo.. in that context, i'm hoping this is the cause of it (even tho this is on a Murano). but the problem is, how can i explain it to the mechanic????????

if this gets fixed, then i'm going stick to Osiris and go back to my tuner to get it dyno tuned. or even get him here to do it.