PlasticMac
Member
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.
fault p1031
- Thread starter weeda
- Start date
A diagram for you if it helps, goes over the top of my head apart from wire colours matching. - Andy
Last edited:
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.
PlasticMac
Member
Good luck. Mac.
Thanks! Very useful, I found this tutorial helpful to decode the diagram. 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.
Last edited:
PlasticMac
Member
That lines up with the voltages you measured too.
I think the N316 is a 3 way valve, as well as applying vacuum to the actuator, to open the flaps, it must vent the vacuum, so the flaps close.
Mac.
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.
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).
Ignore the first few lines with zeroes, this must be the time between pressing the start log button, putting on my seatbelt 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
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).
Ignore the first few lines with zeroes, this must be the time between pressing the start log button, putting on my seatbelt 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
Last edited:
mrbroons
Well-Known Member
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.
PlasticMac
Member
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.
(Like you said though, could all be gibberish!).
Mac.
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.
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.
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.
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.
Last edited:
Kustard83
Member
You should have 12v on pin 1 of N316 this is the supply voltage and is shared across all on D104, the voltage 3v on pin 2 will be the fishing voltage that the ECU uses to detect a fault and generate a fault code.The ECU supplies the earth for N316. So the ECU should see 12v or 0v if it sees 3v it knows there is an open circuit and detects a fault.
If it is a straight switched solenoid you should get zero volts at pin 2 when the solenoid is active.( Between a good earth/pin 2). I can't remember if the flaps are just either open or closed ,or duty cycled PWM in which case pin2 will be switched with a square wave on/off signal to vary the opening of the flaps which is then confirmed by the potentiometer. If you aren't getting 12v at pin 1 and earth this could be your issue.try just bridging a wire between pin 2 and earth and you should be able to activate the solenoid and hence open the flaps ,you should be able to see this on the mvb, usually potentiometers operate between 10/90%. Hope this may help.N79 breather heater used to be common for blowing the fuse.
If it is a straight switched solenoid you should get zero volts at pin 2 when the solenoid is active.( Between a good earth/pin 2). I can't remember if the flaps are just either open or closed ,or duty cycled PWM in which case pin2 will be switched with a square wave on/off signal to vary the opening of the flaps which is then confirmed by the potentiometer. If you aren't getting 12v at pin 1 and earth this could be your issue.try just bridging a wire between pin 2 and earth and you should be able to activate the solenoid and hence open the flaps ,you should be able to see this on the mvb, usually potentiometers operate between 10/90%. Hope this may help.N79 breather heater used to be common for blowing the fuse.
Last edited:
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.
I think I would not rather get into third party file hosting, any chance you have an account? I could email you the file if you would kindly add a link to it in the thread.
Thanks. - Andy
PlasticMac
Member
I'd assumed, (no idea why though) the flap default was closed!
So, in fact, the flaps close as revs rise.
That makes sense of the VCDS setup, I did wonder why the setup ran with engine not running, thinking flaps were closed, whereas, it's actually (probably) checking they fully open, and saving the potentiometer reading as it's reference.
I'm wondering what the infamous "SET POINT" is. Is it Open, Closed, or the % requested by the controller? My guess is it's the requested %. So, failure to match the controllers requested % gives the error code.
Just thinking aloud really.
Mac.
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!
No Vacuum = Flaps fully open.
Andy
Last edited: