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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old August 19th, 2004, 20:08   #1
dosma
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Default DTC 01268 - Quantity Adjuster (N146)?

I have a 97 Passat. At around 6000 ft elevation, 50 deg F and a cold engine it took three starter engagements to start. It then ran well. However the check engine light remained on and the glow plug light blinked continuously. After driving and restarting several times, the console fault lights extinguished. After driving home I hooked up vag-com and found the following engine dtc:

1 DTC Found
01268 - Quantity Adjuster (n146)
35-00--

Can somebody tell me what this DTC is about?
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Old August 19th, 2004, 20:16   #2
codeblue
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Default DTC 01268 - Quantity Adjuster (N146)?

did you check your timing and IQ?
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Old August 20th, 2004, 05:49   #3
Toronto_Vento
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Default DTC 01268 - Quantity Adjuster (N146)?

Are you running biodiesel? Do you have a tuning box? This is a common problem with either of these two senarios. More likely the tuning box than anything else. I recently had this, but it was due to biodiesel use. Have you recently changed fuels? Did this happen soon after you filled up somewhere? Get through the tank and fill up somewhere else.

If you take a look in the biodiesel section in this forum, there is a post called 'check engine light on and glowplug flashing' or something like that. We are trying to get to the bottom of this issue with the bio-d here, but at the same time, if you read the last page or two, we seem to be getting an idea of what causes the code in general.
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Old August 20th, 2004, 22:02   #4
dosma
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Default DTC 01268 - Quantity Adjuster (N146)?

Yes I do burn biodiesel probably half the time. My local sourse of B100 sometimes doesn't have fuel when I need it so I fill up on D#2.

I read the first and last threads on the biodiesel forum concerning biodiesel and Quantity Adjuster dtc's. Interesting. I'll probably jump into that discussion when I have more information. I got my Bently manual back up on my computer and read today the trouble shooting process for this DTC. It will be a learning experience for me since this is the first major dtc that's come up since I purchased Ross-Tek. At present I'm not certain how to translate the Bently jargon into Ross-Tek jargon in the steps layed out in Bently. Can anyone point me to a source of info other than Ross-Tek? I'll check them out as well but before, say a year ago, their instructions where pretty sketchy.

Oh, the question was asked if I have checked the timing? Not recently but a few months ago I set timing to mid point. I'll check it though.

In the meantime I've been driving daily and haven't seen any new dtc's and the Passat is running great. Thanks for the replies.
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Old June 27th, 2005, 10:52   #5
MTjake
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Default DTC 01268 - Quantity Adjuster (N146)?

I need help-reviving this thread to hopefully shed light on the fault code 1268-quantity adjuster now showing up on my Passat. The vehicle (1996 B4V) was operating on it's first (and possibly last) tank ever of B100 returning to Montana from Colorado. I pressed the A/C button and the car shut down and has not restarted. The Casper, WY Volkswagen dealer first told me that I needed a new ECU. Fortunately, the previous owner of my Passat just happened to have a spare ECU sitting in his basement which he overnighted to Casper VW. Now they say that with the replacement ECU, they were able to get the fault code, and now they tell me that I need a new injection pump as the quantity adjuster is not available separately. Is this true? I am also having a tough time reconciling the fact that this dealer has identified the two most expensive parts for replacement, and that somehow they are both responsible for my vehicle's inoperable condition, apparently both occurring at precisely the same time and coincident with pressing the A/C button.

At this point I am on the verge of having the vehicle trucked to my local dealer for whom I have a modicum of respect.

I'm off to read the previously mentioned threads in the Biodiesel forum.
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Old June 27th, 2005, 11:08   #6
rdkern
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

Sounds electrical to me - check the relay 109? Fuses? If the bio-d was that bad, you'd probably have a clogged filter, and the it would have to be a BIG coincidence to have it quit when you pushed in the "air" button. I believe that a clogged fuel filter can also give quantity adjuster errors, but that's not as expensive as a new IP, and the dealer has overhead to meet....

What happens when you turn the key? Do the instrument lights come on? Does the starter turn? This does not sound like a fun drive.

If you have no way of digging into it yourself where you are, you may be $ ahead getting it trucked home, and either getting it to your respected dealer, or spending some time going over the beast yourself.

Good luck!
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Old June 27th, 2005, 11:38   #7
MTjake
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

Thanks much for your advice and sympathies. The first thing I did was swap in another 109 (I travel with 3 of 'em). Next was to check the fuses for the A/C, the injection pump, and just about every other fuse that I thought could possibly be related. No blown fuses. Vehicle still refused to start. It turns over like a champ, but acts as though the shutoff valve is just staying closed. Engine shutdown was immediate, with no sputtering, so I didn't think it was a clogged fuel filter. Would a clogged filter causing the quantity adjuster to throw a code prevent the vehicle from running completely? How does the ECU fit into this scenario? My gut tells me that my old one is just fine. I have it here on the dining room table. Which chip is the Upsolute?

100 degree day, 26 miles out of Casper. Wife needing to get back to work. Dog overheating. Troopers making sure we were ok. Found some high quality tacos in downtown Casper. Finally had to rent a car to get home.

At first I was relieved to find the VW dealer in Casper. Now I'm just extremely suspicious about their diagnostic procedure.
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Old June 27th, 2005, 13:25   #8
rdkern
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

I doubt the fuel filter would cause an immediate shutdown - more like lack of power under load, then, eventually, no power anywhere. Not likely the cause, but it could cause a code to be thrown.

I'd get the car home, and see if some of the things are working.

Like - is the fuel going through the IP? crack an injector hose and see if fuel spirts everywhere.

Was the B100 from a dealer you believe to be reputable? Even bad B100 generally doesn't cause an immediate shutdown.

Have you checked your shutoff valve? Other than a broked tb, (and there you'd probably notice other minor noises like crunching valves and such) or a sudden cut of power to the IP, I'm not sure what else would cause this type of shutdown.

The ECU basically causes everything to go - adjusts the timing, keeps the turbo under control, basically makes sure all is working in the engine. You switched yours, and it's unlikely that both are bad, and they are pretty reliable.

Have you checked your fuel? Try to drain some from the filter. Do you see it in the clear line?

Let's assume that the ac switch has nothing to do with it - sometimes we get sidetracked by coincidences.

For the car to continue running (since it was at the initial problem) you need:
(1) compression - assume it didn't change from the second it was running to the second it wasn't
(2) fuel injected at the right time......
(3) air - and if you ran out of this, you probably would have had some smoke coming out the back during the last short time the car was running.

Kinda puts us at (2).

I've never heard of an IP cutting out entirely like this unless there was an electrical problem - wire falling off, or some such.

The cheapest thing would be for your cutoff valve to suddenly close (cut power - bad ground?) and staying closed for some reason.

I'd tow it home to start eliminating possibilities, or having it towed to your closest mechanic you have confidence in (or some confidence in) and closely diagnose with him/her.

The worst case would be you'll spend the same money, but close to home (buy local, so to speak).

You have 3 109's? Wow, I've been chastised for having a new one in the car, and another new one in the trunk. I assume you're confident that the one you put in was good as well.

The Upsolute chip (at least in my 97b4) is actually two chips. Both are socketed, and can be taken out with a very fine screwdriver, or, as has been strongly recommended by others on this site, a chip puller. They're about 1/2 inch square each.

That sounds so much like a relay 109 ussue - I'd try a third one (since you have them) before I went further. You can test the relay with 12 volts - if you like I'll research this for you and get back tonight (assuming I'm not sidetracked again).
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Old June 27th, 2005, 16:35   #9
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

Use a Mity-Vac and try to pull fuel from the tank. No fuel? Possibly a bad batch of BioD (or the gunk it dislodged from the tank) clogged the fuel pickup or fuel line. Remove and clean it, or do what some have done. Shoot some compressed air down the hose to clear the clog.

Easy to pull fuel? Next, try to pull fuel through the filter. If unable, replace the filter.

Fuel pulls easily through the filter? It starts getting expensive after that. Possibly an IP. But try cranking and see if the fuel squirts out of a disconnected injector line.
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Old June 27th, 2005, 17:21   #10
GoFaster
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

Keep in mind that if the ECU really thinks there's big trouble with N146, and the ECU thinks it has lost control of the quantity adjuster, it will shut the engine down using the shut-off valve as a safety measure.

I cannot prove it, but I have a nagging suspicion that if you put in fuel that conducts electricity (i.e. biodiesel with too much water content along with left-over "soap" from the lye used in the process), it's going to cause a lot of trouble like this.
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Old June 28th, 2005, 08:31   #11
MTjake
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

I did drain the fuel filter-I guess that was the third thing I looked at on the side of the road-it looked like only a tiny bit of water and then it looked like biodiesel dribbling out. We fueled at the Fort Collins B100 pump. I thought they always used Blue Sun, but only after fueling did the guy tell me that he didn't know the source of the B100, but that they had been using a variety of BD producers as the prices changed. So we don't know the quality of the BD. Doh.

At this point, and as far as I can tell, GoFaster seems to be describing a likely scenario-that the ECU is instructing the fuel shutoff to stay closed because of the quantity adjuster feedback. Should I ask the mech to add as much petro diesel as possible, clear the DTC, and see if the thing will start? This still doesn't concur with the "bad ECU" diagnosis from the VW dealer (he said "we have power going in, but nothing coming out"), nor the coincident A/C usage. The previous owner suggested checking all the grounding. Shouldn't there be a fault code in evidence for a bad ground? Shouldn't a bad fuel shutoff/bad ground for the shutoff throw a DTC? I've had trouble "bad ground/short to negative-intermittent" or something to that effect with the shutoff valve before, and originally assumed this was once again the problem, but there is no DTC for it at this time.

Ok, I've identified the Upsolute chips. I just hope they are still ok. This is the GQ ECU. My wife has the same Passat but with a BK ECU. Can one ECU swap into the other car for diagnostic sake? Are the Upsolute chips transferrable between the two ECU's?

I need to get the car shipped up here so I can try all your suggestions. I'll post back with any progress. Thanks all very much.
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Old June 28th, 2005, 08:44   #12
rdkern
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

A bad ground may or may not give a code, but, since you're going to have some quality time with your vehicle, I suggest cleaning all of them anyway - can't hurt and may fix some minor gremlins.

If you had bio "dribbling out" of the fuel filter after some water, perhaps GoFaster hit it. Also - was the "dribbling" about the same thickness as regular D2? If it was thicker, that could be the problem. I don't notice the B100 I use to be any significantly thicker than D2.

Please do keep us informed. How far is your car? If I had to leave mine, I know I could find a trailer and truck from UHaul to be able to haul it back myself (within a reasonable distance) for much less than a tow truck.
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Old June 28th, 2005, 09:13   #13
MTjake
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

Now that you mention it, the BD did seem more viscous than D2, and this at 100 degrees F. Hmm. But I'm still having trouble fitting the ECU into that, unless that was a bad diagnosis from the dealer. I need to check this ECU.

Yeah, Uhaul is the other option, and the one I should have gone with before renting a car to get home. It's nearly a 6 hour drive to Casper, one way. In a fully functional TDI, that is. About 430 miles.
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Old June 28th, 2005, 09:52   #14
rdkern
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

I'm having trouble with the ECU as well - but more guesses at this time probably won't help until you can get the beast back home and start seriously looking. I suspect that when you drain and refill, it'll be OK again.

I try to use B100 whenever possible - but don't fill with it on a trip. I trust my local supplier, but don't have time to deal with issues with others. My only time filling from out of the area ended with a clogged fuel filter - possibly not caused by the fueling, but strange coincidence. I hate d2, but use it away from home from "high volume" dealers.

So, hauling it yourself (full day driving) or having it towed ($400?? more or less). Tough call.
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Old June 28th, 2005, 10:21   #15
MTjake
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Default Re: DTC 01268 - Quantity Adjuster (N146)?

The auto transport places don't do "inops", so it's looking like Uhaul.

I like your fueling strategy, and plan to implement similar strategy from now on. I was thinking that a long B100 fueled road trip would clean up my intake, and maybe it did, but...
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