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OBD Scanners Discussions on using On Board Diagnostic (OBD) scanners/ Diagnostic Equipment related to TDIs

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Old July 4th, 2011, 12:27   #1
glitdi
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Default Tandem pump, checking fuel pressure using vcds...

Any ideas how to check to see the tandem pump is working corectly using vcds?
Sorry for the newb question I am still trying to figure out the ins and outs of the vcds system.
I am assuming logs would be the best bet however I don't know which channels/controllers to plot.
Any suggestions would be greatly appreciated.
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Old July 4th, 2011, 13:18   #2
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There is no direct way to check the tandem pump with the VCDS.

You can only look at the injector parameters in the fuel system.
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Old July 4th, 2011, 14:33   #3
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Like Dan said. VCDS can only report on something that has a sensor.

To check the Tandem pump pressure you need to connect a gauge with a "T" fitting in the output so that you can observe the operating pressure of the Tandem pump with the engine running.

Dead ending the Tandem pumps output with a gauge and cranking/running the engine will not give you an accurate operating pressure and will probably damage the Tandem pump.
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Old July 4th, 2011, 14:51   #4
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Yep, only the gasser direct injected engines have fuel pressure sensors.
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Old July 4th, 2011, 16:33   #5
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I may have answered your question too narrowly.

You can do some tests without the gauge and fitting.

PD fuel system look in post #7 and the linked PDF.
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Old July 7th, 2011, 11:03   #6
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Yea Dan, that some good info. That's exactly what the OP needs.

Kinda funny that folks sometimes think that VCDS will magically tell them what is wrong with their cars.
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Old July 8th, 2011, 09:35   #7
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Quote:
Originally Posted by Ol'Rattler View Post
Kinda funny that folks sometimes think that VCDS will magically tell them what is wrong with their cars.
Happens way more often than you might think. We even get sales calls asking if it will fix their car..... people who think VCDS is a professional tech in a box. Well, we're good, but we ain't that good.
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Old July 9th, 2011, 01:25   #8
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Quote:
Originally Posted by BeartheBruce View Post
Happens way more often than you might think. We even get sales calls asking if it will fix their car..... people who think VCDS is a professional tech in a box. Well, we're good, but we ain't that good.
Well shoot, I want my money back then.
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Old July 11th, 2011, 05:01   #9
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Quote:
Originally Posted by BeartheBruce View Post
Happens way more often than you might think. We even get sales calls asking if it will fix their car..... people who think VCDS is a professional tech in a box. Well, we're good, but we ain't that good.
Yes, that is always a funny conversation with the customer.

Them: [over the phone]: This light on my Jetta TDI is on, can you tell me what is wrong with my car?

Me: no, we will have to plug our computer into your car, and see why the light is on, then find out what is wrong with the car.

Them: yeah, but that computer tells you what is wrong.

Me: no, it tells me why the light is on.

Them: oh, so you just need to turn the light off? I can do that.

Me: no, the light is on because there is a problem, the computer allows me to see why the light is on, to afford me a starting point in diagnosis of the problem.

Them: but the car runs fine!

Me: yes, I'm sure it does, but the light can come on for many reasons and the computer in your car that makes the engine run is smart enough to be able to motor on even with a fault.

Them: well of it is smart enough to motor on, then why does it not just turn the light off by itself?

Me: because the car cannot fix itself, it can only alert you that it is having a problem.

Them: but it runs fine!

Me: [facepalm]: yes, but it may not continue to run that way, or it may have a fault that will cause poor emissions, poor fuel economy, poor power, or more.

Them: well it does seem to be slower now.

Me: oh, so your definition of "fine" is used on a sliding scale?

Them: well, it starts and moves. And hey, if my car already has a computer, why do you need yours to connect to it?

Me: well, actually your car has several computers, but none of them can print out what ails them, and some cannot even alert you via a light.

Them: you mean there are more lights?

Me: yes, many.

Them: where are those?

Me: [facepalm... again...]: all those red and orange lights that come on when you turn the key on.

Them: oh. Well, I also have this vibration. Can your computer tell you what that is?

Me: most likely not, I really need to see your car.

Them: for what, the light or the vibration?

Me: both.

Them: so how much will it cost to fix?

Me: I have no idea, because I have no idea what is wrong with your car.

Them: well I told you, I have a light on!

Me: [losing patience]: yes, but I need to have your car here, in the shop, for me to diagnose that!

Them: well, my sister-in-law said it is probably just a loose gas cap.

Me: [facepalm]: sounds like you have it licked then! Good luck! [click]
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Old July 11th, 2011, 06:47   #10
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Oh, common story that happens time to time.
I have same situations over and over.
One of the usual is:
"Why you have to charge me diagnostic fee , when computer will tell you in 5 min what is the problem".

Yes I am just going to seat on mu ass and computer will do everything for me, bla , bla, bla. Then I have to explain for about 30 min the money that they will pay it is diagnostic time that I have to spend on car and computer will just direct me what I need start diagnosing .
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Old July 11th, 2011, 09:48   #11
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LOL at oilhammer's post. At that point, you should just sell them some electrical tape for the light.
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Old July 11th, 2011, 11:05   #12
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Thanks for the info guys.. and yes oilhammer your post was a great read... mil lights and how people react to them is always so funny.
Light turns on person starts panicking like the sky is falling... Or drives on it for 3 years and wonders why they need a new tranny, insert major component here _________.
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Old July 11th, 2011, 11:20   #13
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Quote:
Originally Posted by wolfsburg_de View Post
LOL at oilhammer's post. At that point, you should just sell them some electrical tape for the light.
Believe or not but I had people asking me that to cover CEL light with something.They said my car drive fine , it is just a stupid light.
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