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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 February 17th, 2016, 17:10   #1
cal327
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Fuel Economy: 45-53 mpg
Default 3rd injector needle lift sensor help

2 days ago my car suddenly started going into what felt like limp mode but would come back to normal intermittently with no consistency so I checked my fuel filter I drained a small amount of water then fuel went and put ps diesel 911 in it still assuming fuel gel or water (it was the coldest day we have had so far this year) still no help then the mil came on accompanied by a flashing glow plug light pulled codes with scanguage p1247 needle lift fault cleared it and went back to normal now power still comes and goes and I get intermittent or pending p1247 code I ohmed out the sensor and got 96 ohms checked for fuel restrictions which leads me to now be looking for a fuel pickup/sending unit either new or used... but after inspecting that I went back and ohmed it out again and got 3.47-9.58 K ohms and it fluctuated constantly it wouldn't settle out played with the wire from injector to connector with no change leading me to believe the wire is ok and the wires to the pcm got checked and are good.
So... i believe the spec for the sensor it 80-120 ohms if so what is causing it to change without being touched and also does it output a DC voltage or an ac sine wave to the pcm so I can monitor it with the engine running?

And lastly where is the best place to purchase a fuel sending unit?

Thanks in advance for any help!
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1996 B4 234k+: dlc 1019's, stage 2 endurance sbc w/ 17lb flywheel, malone 3, 2.5 turbo back, Frank 06 stg 2 cam, lots of suspension work and lots of other mods
1995 CHEVY K2500 6.5TD 240k+
1999.5 Golf tdi: stock, girlfriends car.
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Old February 21st, 2016, 21:36   #2
Digital Corpus
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You most likely have a frayed wire. I spliced a new connector on the engine wiring harness side. As far as I can tell, its a DC signal and it detects, quite well mind you, the movement of the needle as it disrupts the magnetic field in the coil.
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Old February 22nd, 2016, 07:03   #3
cal327
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Wow that is an excellent write up! Thanks for that! I did some more investigation and I checked the harness from the connector to the ecu and the wires seem ok even load test ok, but I am getting the injector sent out and repaired and will see if that fixes my issue I have parked it for now until I figure it out. Does that wire run through the orb of wires by that connector? Because mine is seized together
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1996 B4 234k+: dlc 1019's, stage 2 endurance sbc w/ 17lb flywheel, malone 3, 2.5 turbo back, Frank 06 stg 2 cam, lots of suspension work and lots of other mods
1995 CHEVY K2500 6.5TD 240k+
1999.5 Golf tdi: stock, girlfriends car.
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Old February 22nd, 2016, 10:32   #4
Abacus
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No, the third injector wire is separate from the Orb. Make sure it's the brown connector and not the black, I've seen them mixed up before.
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'96 B4V: 356,000 miles Malone 2+, PP520's, 6 speed, 02J short shifter, E-Codes, G60 brakes, Evo plate, DMF, stainless exhaust, heated leathers, cold weather package
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Old May 25th, 2018, 19:34   #5
cumminsfromthecold
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Default 1Z TDI Needle lift sensor

While I've been reading all the needle lift sensor posts I can find to help shed light on my P00542, "Needle lift sensor (G80), 30-10 open or short to plus - intermittent", one thing I haven't gotten clarity on is the wiring. I see references to a new style of wiring connector/harness being installed vs an old original one. On mine, I discovered a black wire under the jacketing - it is cut. It just ends there in the jacketing. This doesn't seem right. The manual doesn't show this and I have seen only one other post on this weirdness:
http://www.myturbodiesel.com/threads...ble-code.4412/
The answer doesn't make a lot of sense to me.
Here's a pic of my wiring:


Is there a difference in years and or transmissions and G80 wiring?
What am I looking at? What should I do with the mystery black wire?
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Old May 26th, 2018, 06:09   #6
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I remember the same, from when I was lengthening my harness, for the project car. I didn’t chase the black to see if it was unused at the ecu end.

-Todd
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Old May 26th, 2018, 08:42   #7
cumminsfromthecold
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ToddA1, did it matter? Did the G80 work?
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Old May 27th, 2018, 07:38   #8
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I wish I could answer that.... that would mean my project was finished. Maybe in a couple years, lol.

-Todd
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Old May 27th, 2018, 21:21   #9
cal327
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The black wire most likely ends at a ground, its probably used in conjunction with the foil type insulation you see in the picture to help reduce electrical interference on those wires. The ecu only needs 2 wires the black one should have no effect on your concern, unless one of the other 2 wires are shorted to it
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1996 B4 234k+: dlc 1019's, stage 2 endurance sbc w/ 17lb flywheel, malone 3, 2.5 turbo back, Frank 06 stg 2 cam, lots of suspension work and lots of other mods
1995 CHEVY K2500 6.5TD 240k+
1999.5 Golf tdi: stock, girlfriends car.
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Old June 3rd, 2018, 12:11   #10
Steve Addy
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Quote:
Originally Posted by cumminsfromthecold View Post
While I've been reading all the needle lift sensor posts I can find to help shed light on my P00542, "Needle lift sensor (G80), 30-10 open or short to plus - intermittent", one thing I haven't gotten clarity on is the wiring. I see references to a new style of wiring connector/harness being installed vs an old original one. On mine, I discovered a black wire under the jacketing - it is cut. It just ends there in the jacketing. This doesn't seem right. The manual doesn't show this and I have seen only one other post on this weirdness:
http://www.myturbodiesel.com/threads...ble-code.4412/
The answer doesn't make a lot of sense to me.
Here's a pic of my wiring:

Is there a difference in years and or transmissions and G80 wiring?
What am I looking at? What should I do with the mystery black wire?
I'm with Todd, my wagon conversion (98 MK3 ECU / wiring) has the same cut black wire, so ignore it.

There will be no difference in the Mk3 from 97-early 99 but with the B4 there have been differences mentioned in wiring for some things but how many variations there are is the question.

I have a 96 B4 harness that I compared to my 98 mk3 harness before install and there were maybe a handful of differences; catalyst sensors, 5th injector etc. For the most part my comparison found them pretty much identical.

Steve
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Old June 4th, 2018, 20:11   #11
Steve Addy
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I found my wiring notes from when I worked on my project, I can't find a completely black wire that goes to the ECU so I wouldn't worry about that.

I would bet that the black wire gets bundled with other ground wires somewhere further on in the harness although where that is I can't say.

Is that wire completely black or does it have a colored stripe on it?

Steve
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Old June 4th, 2018, 20:20   #12
ToddA1
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Solid black, no tracer. I looked at the ecu plug the other day, while working on the project car. The black definitely didn’t to to a pin terminal.

As mentioned, it may gone to a ground wire cluster, but I wasn’t unwrapping the harness to find out.

-Todd
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Old June 4th, 2018, 21:17   #13
Steve Addy
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Quote:
Originally Posted by ToddA1 View Post
Solid black, no tracer. I looked at the ecu plug the other day, while working on the project car. The black definitely didnít to to a pin terminal.

As mentioned, it may gone to a ground wire cluster, but I wasnít unwrapping the harness to find out.

-Todd
Mine is still in the factory wrapping, the wire was cut and taped to the wire cover so almost no part of the black wire was showing.

I may put a meter on it tomorrow just to see if there's continuity to ground there.

I never noticed it before this post, which is odd since I unwrapped almost all of that entire harness when I stripped out the unnecessary stuff before installing it in the B3V.

Steve
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Old June 7th, 2018, 10:43   #14
Steve Addy
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I checked today, the black wire shows continuity to battery ground.

Steve
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