PlasticMac
Admin Team
If there is a change on that vcds log, when the flaps move, the potentiometer is OK, so N316 would be the suspect. Interestingly, Golf FSI folk say solenoid failure is not uncommon.
Mac.
Mac.
A diagram for you if it helps, goes over the top of my head apart from wire colours matching. - AndyHi,
When you took the voltage readings (Green/Yellow wire 11.9v, Purple/Yellow 3.6v), were these between those wires, and grnd/chassis? If so, I'd expect one to be 0v, assuming it's a two wire solenoid.
Mac.
Thanks. This doesn't tell me the exact group but suggests I just scroll through them all. I did find this page but again it doesn't seem to contain the exact sensor that I need. I am guessing that these groups all differ between models. Will have a play tomorrow to see if I can find it.
I measured 3.6v to N316 so I assume it could be that but assumptions can be wrong. I like the idea of logging the data while sucking on the vac line, will give it a try.Yes, I think it is. Wondering what the voltage coulmn is. Potentiometer output, or applied volts to the N316?
Good luck. Mac.I measured 3.6v to N316 so I assume it could be that but assumptions can be wrong. I like the idea of logging the data while sucking on the vac line, will give it a try.
A diagram for you if it helps, goes over the top of my head apart from wire colours matching. - Andy
Thanks! Very useful, I found this tutorial helpful to decode the diagram. As far as I understand it, connection 1 to N313 goes to the bus strip D104 which is permanent battery + and connection 2 goes to the controller.
In an effort to be helpful I thought I would take a VCDS log of Measuring Block 142 on my what I believe healthy FSI. I included Block 001 for RPM.
View attachment 59586
Notice the REDIR FAIL! = Nobody has provided a customised label file for this ECU. This means VCDS is allocating labels on a best guess basis based on the nature of the data. Now then if Block 142 is data about the flaps then its got it wrong and 'Load' is inappropriate, conjuring up images of engine load. I suspect that post #26 above is correct in that the first field is 'Flap % Shut - Actual' and the second field 'Flap % Shut - Requested', therefore a value of 0% = Fully Open and a value of 100.0% = Fully Shut. (This could all be gibberish!!!).
The value of '2.300 V' never changes, whatever it is, likewise for 'ADP. O.K.' in a 15 minute log.
The start of the log (with some columns hidden for clarity).
View attachment 59587
Ignore the first few lines with zeroes, this must be the time between pressing the start log button and turning the ignition key to start the engine.
To be continued... I am having difficulty uploading the log file as the upload is rejected with 'The uploaded file does not have an allowed extension.' ???????
Andy
I was slightly mistaken, with the ignition off there is no voltage on the connectors. What was interesting is that when I back probed the connector while attached and the ignition on, both were 11.6v, disconnected connector 2 (purple/yellow) was 3.6v.As far as I understand it, connection 1 to N316 goes to the bus strip D104 which is permanent battery + and connection 2 goes to the controller.
I sucked on the vacuum line and could see the Load % move from 1.6% to 100% and hence I am guessing that the petentiometer is working correctly. With the engine stopped I have 1.6% and 0%, with it running I have 100% and 100%. This suggests both the solenoid value (N316) and the potentiometer (G336) are operational. Will try to get some more systematic logs to share.Taking the same log, while manually moving the potentiometer might clarify. This could be done via sucking the vac line, as (recent) OP did to check flaps.
This matches with what I observed. When cleaning the flaps, I noticed that a spring returns them to the open position, so that is the default position if no vacuum is applied. When I manually applied a vacuum the load changed from 1.6% to 100% so 'Flap % Shut - Requested' seems correct.Notice the REDIR FAIL! = Nobody has provided a customised label file for this ECU. This means VCDS is allocating labels on a best guess basis based on the nature of the data. Now then if Block 142 is data about the flaps then its got it wrong and 'Load' is inappropriate, conjuring up images of engine load. I suspect that post #26 above is correct in that the first field is 'Flap % Shut - Actual' and the second field 'Flap % Shut - Requested', therefore a value of 0% = Fully Open and a value of 100.0% = Fully Shut. (This could all be gibberish!!!).
From what I measured by back probing connector 2 on N316, with engine off (flaps open) I had 11.6v and with the engine on (flaps shut) I had 0.36v. VCDS had a constant voltage so I don't think it is related to the solenoid valve.If '2.300 V' is the voltage on the valve, it would be constant, as no call for flaps to move. I'll try to do a log while driving. Just need a co-driver/laptop operator!
(Like you said though, could all be gibberish!).
Mac.
Thanks for that. I could just just change the existing file name suffix to .pdf from .csv but as the suffix implies it consists of Comma Seperated Values and it would not make interesting or easy reading! - 800 lines of numbers. As you say the data has to be used and as it stands it is suitable to load into Excel (or similiar) so at least it is formatted into columns with headings.Try uploading the log file as a PDF or if the raw data is needed host it elsewhere (dropbox, box, google drive etc..) and post a link to that.
This matches with what I observed. When cleaning the flaps, I noticed that a spring returns them to the open position, so that is the default position if no vacuum is applied. When I manually applied a vacuum the load changed from 1.6% to 100% so 'Flap % Shut - Requested' seems correct.
Many apologies, I had this the wrong way round in my head - I thought the default flap position was closed until I read your post. Checked with a spare manifold!This matches with what I observed. When cleaning the flaps, I noticed that a spring returns them to the open position, so that is the default position if no vacuum is applied. When I manually applied a vacuum the load changed from 1.6% to 100% so 'Flap % Shut - Requested' seems correct.