fault p1031

It was strange that yesterday the reading was 1.6%. It only went to 33.7% when I switched to basic settings to do the adaption.
While on the school run this evening I had a few minutes so hooked up the VCDS to see if I could figure out why it was reading 1.6% but now 33.7%. To my surprise it was reading 1.6%, so I immediately switched on logging. In my excitement I forgot to record the engine RPM but we know from the previous run that the swirl flap opens at around 3200 rpm. As everything seemed fine, I cleared the eror code then tried to go to Basic Settings. It showed ADP. Run and stayed like that. After a minute I switched the ignition off, left the car while I picked up the the kids. So far the engine light hasn't come back on and I have made at least one stop and restarted the car about five times.

Load %​
Load %​
1.6​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
1.6​
0​
ADP. O.K.​
100​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
81.6​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
0​
0​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
98.8​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
100​
100​
ADP. O.K.​
 
I'm happy to do any testing with my similar problem that may move things on and video the progress. So far I think that I'm going to test that the flaps are connected via the rod and then use some EGR3 as a basic way of cleaning the internals given it is at 130k. I will likely go the whole way and video the flaps removal and cleaning (I have a new sonic bath cleaner to try!) but simple things first! Any other things I can test this evening? Happy to run the same tests as above using VCDS first as a baseline for my issue as it's the same as described.
Setup VCDS to show measuring blocks 01 and 142, start logging then switch on the engine and press the accelerator to get the RPMs above 3200. Trim the log so that it only shows the RPMs, the two Load values and the adaption state then paste it here. We can then compare the results and see if we can diagnose the issue together just from that.
 
Thanks, I've just come back in from the getting the data.

First things first. I think that I have recorded the log (not having done this before), but I cannot locate it, I'll start searching when my fingers have unfrozen.

Second my manifold rod appears to be attached, there is no break in it and it moves but only under pressure and seems to return to the "down" position with a little assistance (maybe sticking). Is this inline with the expectation for a working rod/flap?

Third, my data was pretty fixed at about 24% continuous even when warm and and revving to around 4k.

Fourth I managed to find the output test for the flap but I could only run it once it seems. Do you need the login for the engine to run this test, I guessed at 12345, does anyone know what the actual code is and if it is required for the output test? I've run this before but I don't think I needed this?

Data to follow, laptop battery flat and now on charge.
 
Second my manifold rod appears to be attached, there is no break in it and it moves but only under pressure and seems to return to the "down" position with a little assistance (maybe sticking). Is this inline with the expectation for a working rod/flap?
Basically yes, but I think it should return "down" without assistance, suggests sticking.

Andy
 
Thanks. It looks like you started the logging after the engine was started and you did not go past 3200 RPM so we cannot observe any expected mode changes.
 
It's odd that I actually did do both and I did not observe much changing in the instantaneous readout. Is there a way to change the timing of the recording interval or is it simply a case of holding the RPM for a few seconds each time as opposed to revving and releasing?
 
It looks like it tries to sample data every 0.6s and I don't know if it is possible to change this. So you have to hold the RPMs above 3200 for a few seconds.
 
Great, will try that tomorrow and upload again. Everything was die-ing out in the cold, will need to get the car out of the garage and try again tomorrow. At least I know the rod is intact and is moving (ish)
 
Great, will try that tomorrow and upload again. Everything was die-ing out in the cold, will need to get the car out of the garage and try again tomorrow. At least I know the rod is intact and is moving (ish)
The best tip I had was to suck on the vacuum pipe. It is easy to disconnect and swivel round under the air intake. If some one with a spare manifold could measure the normal travel, we can use tipex marks to estimate the flaps operation.
 
Thanks. So connection 1 is 5v, connection 3 is ground and connection 2 should vary depending on the resistance. Will see if I can measure it at the ECU as it maybe easier to access.
Looks like it's a simple potentiometer, Pin 1 & Pin 3 are the two ends of the resistance track arc, and Pin 2 is the wiper, which moves with the flap shaft. Varying resistance Pin 1 to Pin 2 is proportional to flap shaft position.
Mac.
 
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With flaps closed I put a mark on the arm where it enters the actuator. The mark then moves away from the actuator 15mm when the flaps are opened. Difficult to measure accurately though.

Andy
Only a guess, but I'd think the small radial flap shaft movement is geared within the potentiometer case to give, maybe 300+ deg arc of a typical rotary potentiometer. Otherwise the resolution to 0.1% couldn't be achieved.
Mac.
 
Only a guess, but I'd think the small radial flap shaft movement is geared within the potentiometer case to give, maybe 300+ deg arc of a typical rotary potentiometer. Otherwise the resolution to 0.1% couldn't be achieved.
Mac.
From looking at my logs the resolution is more like 1.6%.
 
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