[Resolved] 2016 T6 Alternator/Charging Issues

[Victor500]

Hi all, I’m hoping for a bit of advice regarding some issues I’m having with my van.

My battery light is on, my battery isn’t charging, and I’m struggling to figure out if it’s an alternator, battery control module or wiring issue.

I’ve scanned the van and I’m getting a 02252 code, although I will admit I’ve been seen this code intermittently in the past but It’s never seemed to cause an issue and certainly hasn’t caused the battery light to come on or to have low voltage.

I’ve checked the yellow and green linbus wire that runs from the battery control module to the alternator, and it doesn’t seem to have continuity. Having seen a few threads here with similar issues, the advice is to bridge the alternator directly to the BCM - but when I do this it doesn’t make a difference, the voltage across the battery stays at around 11.5v.

Not sure what the next steps are, so any advice would be gladly appreciated. I’m wondering if it’s possible that the continuity/linbus issue is and old one, and that the alternator has now broken meaning I’ve actually got two problems to fix? Does the alternator kick in automatically at a certain voltage even if the BCM/limbus isn’t connected?

Cheers guys!

John

 

[Ads_Essex]

checked the yellow and green linbus wire that runs from the battery control module to the alternator, and it doesn’t seem to have continuity.

I was going to suggest this thread, but I think you’ve already tried what @Cjscos tried:

Alternator not working? [Resolved]

The N75 is controlled by the ECU. As I said before I assume you didn’t have an issue prior to repairing the alternator issue. Have you checked for wiring harness damage? There is a boost pressure sensor that will be providing input to the ECU, no idea where it is on a single turbo engine (CAAC)...

www.t6forum.com

 

[Dellmassive]

Are we assuming the belt is attached and good?

 

[Victor500]

Are we assuming the belt is attached and good?

Hi Dell, Yes, belt attached and rotating in one piece.

 

[Dellmassive]

So the LIN bus data link for the alternator....

Where did you test it from and too?

Battery sensor, engine ECU, van ECU BCM?

 

[Victor500]

So the LIN bus data link for the alternator....

Where did you test it from and too?

Battery sensor, engine ECU, van ECU BCM?

Hi Dell, I just tested continuity between the yellow/green cable from battery controller to the yellow/green cable on the alternator

 

[Power ut]

How u checked the alti linbus wire ( common for them in to break Usely just were wire comes from conector with engine vibration

 

[RattyMcClelland]

Thought I'd update this.

After much fault finding we found the issue.
It was a break in the Linbus wire from battery negative module to the alternator.
The whole wire looked perfect, but after testing continuity every few mm across the wire we eventually found where it had smapped. Right bang in the middle near the sump.
No visual breaks but we bent it and it snapped and powered instantly.
Resoldered and now properly working for the first time in 2 years nearly. Start stop is back and smart charging.

Let's hope its reliable until the summer when it goes.

 

[Dellmassive]

Thought I'd update this.

After much fault finding we found the issue.
It was a break in the Linbus wire from battery negative module to the alternator.
The whole wire looked perfect, but after testing continuity every few mm across the wire we eventually found where it had smapped. Right bang in the middle near the sump.
No visual breaks but we bent it and it snapped and powered instantly.
Resoldered and now properly working for the first time in 2 years nearly. Start stop is back and smart charging.

Let's hope its reliable until the summer when it goes.

seems to be a comms issue . .

can you post some pics showing it,

general location etc etc so people know where to look.

 

[RattyMcClelland]

Dam, I updated the wrong thread. This isn't mine but the same issue.

 

[oldiebut goodie]

Thought I'd update this.

After much fault finding we found the issue.
It was a break in the Linbus wire from battery negative module to the alternator.
The whole wire looked perfect, but after testing continuity every few mm across the wire we eventually found where it had smapped. Right bang in the middle near the sump.
No visual breaks but we bent it and it snapped and powered instantly.
Resoldered and now properly working for the first time in 2 years nearly. Start stop is back and smart charging.

Let's hope its reliable until the summer when it goes.

I have had a broken wire like that in a brand new Webasto loom, took me ages to find it as the looms are very tightly cloth wrapped with very sticky adhesive. Couldn't work out where the fault was until I checked continuity across every wire. Just because it is new doesn't mean that it is OK!

 

[n10n]

Just a thought:

Not all of these wire faults seem to be by the connector. At least in 204 where the oil filter points down I have to push the looms aside a bit when changing oils to avoid them getting dirty and to get the filter cleanly out. If 1+1 is 2 could the bending of the looms cause strain and eventually issues with that wire? It seems strange that there are many sensors and what not but somehow this LIN wire fault is so common.

 

[Dellmassive]

Start stop error/alternator charge issue ongoing

I've been chasing my tail with this issue for over a year now. Literally spent a couple of thousand trying to sort it and it still won't fix the issue. The garage I use are at a loss too. I have a start stop error on the dash. Also, if I start the van and let it idle, it won't charge the...

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