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'06 XC Fatal Fault?

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'06 XC Fatal Fault?

Post by BlackBart » Mon Sep 09, 2019 11:10 am

My neighbor has a nearly identical car to my XC, but it's an '06. Not car people at all. Bought it from a colleague who was moving overseas.

He told me one day it cut out and quit on him going over the pass to Washington. Re-started, drove ok after that. Drove it home ok. It sat on the street quite a while. I asked him what was happening, and he said they spent $500 of diagnostics time and had to tow it home - wouldn't even start.

I asked what kinds of codes it had. He doesn't know about that kind of thing, but remembers they told him "one of the two computers" isn't talking to the other, or the car, he wasn't sure. He's ready to sell it for peanuts and give up. I can't figure out what he's telling me, but it sure seems like a salvage ECU or whatever is happening would be a simple fix, vs giving the car away. (They normally drive old rusty Toyotas that run forever and do almost no maintenance) He's only had this car a year, so he couldn't have killed it that fast.

Are there any solid clues in that vague description? Could he have taken it to a generic shop that can't figure out Volvo codes? Which "two computers" would he be talking about?

I'm not in a position to take his car apart and solve it, and no VIDA to connect, but this seems like a real waste. A black 2006 with reasonable miles and nice tan seats.


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Re: '06 XC Fatal Fault?

Post by - Pete - » Mon Sep 09, 2019 11:50 am

On our 06 I had something similar happen once. More of a crank-no-start scenario. I have VIDA/DiCE but have no idea how to use it & don’t even have it set up on a laptop yet, so using a cheap scanner instead I came up with nothing. Problem was intermittent, it did shut off while running several times, though I don’t recall it happening while driving.

Anyhow I was watching some Russian or Czech YouTube videos that popped up when searching for crank-no-start scenarios & saw where one guy traced it down to the little purple wire at the top of the fan shroud being corroded & thus only allowing intermittent connectivity. I have no idea what this wire even does, but sure as sh!t on ONLY our 06 it was green and corroded in one tiny 1-2mm section just above the plug. Cut out that 2” section, soldered in a new piece and haven’t had a single reoccurrence.

Like you said, the info you got from the neighbor is pretty vague, but given the description & the coincidence I had with similar symptoms & zero codes being produced I’d look at the purple wire first.

Or wait til he sells it for peanuts & be there to heroically swoop it up & then investigate.

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Re: '06 XC Fatal Fault?

Post by abscate » Mon Sep 09, 2019 1:10 pm

IF the garage can't diagnose a no-start they need to be fired.

Computers aren't talking isn't very useful, they probably know more than this but its a lot more profitable to be doing brake jobs and oil changes than chasing demons, to be fair.

In a 2006 car, the ECM, TCM, CEM all have to play nice and be on the same VIN to work, no swapping in other modules like on the P80s.

VIDA will be the tool that will solve this - anything else will be monkeys in a barrel chasing each other.


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Re: '06 XC Fatal Fault?

Post by BlackBart » Mon Sep 09, 2019 1:37 pm

Abscate - You're saying all three of those have to be coded together? You can't swap in one or another into the system?

Pete - Your particular car had a green wire there, but normally it's purple? How many miles since that fix?


I'd like to see the report sheet from this garage, to see what they actually told him.


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Re: '06 XC Fatal Fault?

Post by - Pete - » Mon Sep 09, 2019 1:49 pm

It’s the tiny purple one between the fat black & red wires. Look at yours, it’s the same on all of them. I just circled the area in green on the picture so you know where to look. I’d say probably 10-15k since I soldered in the new section of wire.


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Re: '06 XC Fatal Fault?

Post by abscate » Mon Sep 09, 2019 3:21 pm

BlackBart wrote:
Mon Sep 09, 2019 1:37 pm
Abscate - You're saying all three of those have to be coded together? You can't swap in one or another into the system?

Pete - Your particular car had a green wire there, but normally it's purple? How many miles since that fix?


I'd like to see the report sheet from this garage, to see what they actually told him.
Not positive about the TCM but the ECM and CEM, and perhaps the DIM, have VIN coding in P2 - have a look at FCP and see if software is required when you buy a module - Xmodex will also sell cloning for those that have to be matched, too.


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Re: '06 XC Fatal Fault?

Post by - Pete - » Mon Sep 09, 2019 9:45 pm

I see what you were seeing, that green little nub is just a cap or nipple recessed into the big plug. I’m sure a lot of P2’s & others use the same plug & that port may be used on other vehicles. On these it is not, just the purple wire coming out adjacent to the green nipple/plug. Look up about 1” or so from where the wire comes out of the plug & if you see a small section of green corroding copper type stuff that’s your issue.


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Re: '06 XC Fatal Fault?

Post by BlackBart » Wed Sep 11, 2019 10:33 am

I see - you said yours was green, but you meant corroded and green.

I asked him if he would show me the shop report, and I'll look at that wire if he's up for it.


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Re: '06 XC Fatal Fault?

Post by BlackBart » Wed Sep 11, 2019 10:57 am

ECM = Engine Control Module (same as ECU)
TCM = Transmission Control Module
CEM = Central Electronic Module

DIM = Driver Information Module (n the cluster, controls and monitors many functions)

(Thanks for the glossary, Matt!)

If the ECU/ECM is controlling engine functions, what does the CEM do? And how are those tasks shared with the DIM?


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Re: '06 XC Fatal Fault?

Post by abscate » Wed Sep 11, 2019 11:23 am

Engine management is distributed across many things in P2s

Simplest example

Fuel pump control...the voltage source is a relay on the CEM, the eCM sends a request signal to the Pump Electronics Module or PEM , which converts the signal to the waveform necessary to give correct fuel pressure.


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