Thread: First run of new evo-logged Air flow circuit HIGH

Originally Posted by PhilipA

I received my Nanocam Evo last night and got the licences for my Disco 2 TD5.
ran it for the first time this afternoon and 3 faults logged
Air flow circuit (logged HIGH)
Road speed Missing (logged)
Injector 2 open circuit( logged)

The two lower ones probably refer to when the battery disconnected while moving and the old loom which I replaced.
HOWEVER I have googled and there seems to be nothing on Airflow circuit logged HIGH. The MAF when failing appears to log LOW.

I am speculating that I still have overboost seeing that I get a big miss only at 4000RPM on full throttle . Is there a specific error on overboost?

I have replaced the EGR modulator , the loom, and exercised the wastegate, however I seem to recall from my Charade Turbo, Cordia turbo and Porsche turbo, that the waste gate should go to about 90 degrees while mine goes to about 75degrees easily. I didn't want to force it past where it wanted to stop as it would not be a good look to need a new turbo because I had broken the wastegate off.
Any thoughts on above ?
Otherwise the car goes really well with good response and economy of 11.8 around town.
Regards Philip A

Hi Philip,

Congrats on the new toy. You'll have hours of fun with it.

The most useful thing about the Evo when diagnosing problems is the ability to record inputs to file rather than reading and clearing fault codes.

The over boost condition doesn't usually trigger a fault so you have to diagnose by recording the fuelling inputs. The tell-tale sign is that the manifold pressure will drop to exactly 100.00 kpa immediately after the overboost is detected and the ECU limits fuelling.

What you'll often see is that the airflow reading spikes quite sharply in conjunction with the overboost so if you fix the overboost issue then the over-read on the MAF may well be resolved too.

If you don't already have an SDCard I'd suggest picking up a 2Gb Verbatim microsd card and adapter from your local (C*les) supermarket. They are fairly cheap - $8.00 - and seem to work well in the EVO without any additional formatting.

Once you have a card you can record inputs from most modules by clicking on the disc icon to set a file name and start the recording process, then finishing the recording by clicking the disc icon again when you are done. The 2Gb card will allow you to record about 5 1/2 hours of engine data.

If you want to do a record session that includes a section where you can replicate the 4000rpm miss we can have a look at the file and see if there are any obvious issues.

cheers
Paul

Thanks Offtrack.
I have already installed an SD card and copied some data onto it to check it worked. I copied the txt file for the faults and a couple of minutes ECU data as a CSV with engine off. So it works.

What do the graph symbols at the bottom of the page do? Mine has 2 graphs plus 1 Xd out.

I also looked at my alarm settings as my plips don't work. The key codes are correct , but there is no RF on the RF test.The passive immobilisation is inactive, and it said key only. When I changed to "all" I lost everything for a heart stopping 10 seconds.
The question is- does passive immobilisation need to be allowed before RF is received?
I suspect the RF receiver in the roof but I am VERY nervous touching anything in the immobilisation area.
How do you get back in if the key codes are lost and the dash goes black?
Regards Philip A

The graph symbols give you peak and minimum readings. The symbol with the cross clears the stored peak/minimum values.

Don't worry about the dash going black. The BCU controls the instrument panel and everything switches off when you connect. You can test all the dash functions from the BCU module so I guess it makes sense. You need to turn the ignition off and wait for 30 seconds or more unit it resets.

You can make backups of the settings in most modules. The disk icon in the settings page lets you do this. You can load back from file using the folder icon. With the BCU it's probably worth doing if you are unsure about the effect of certain configuration settings.

The RAVE operation and description sections for the BCU and the Alarm system have a lot of detail on the settings options.

Cheers
Paul

Ok I have done a dump of an acceleration run which looks weird to me.
I have highlighted revs, airflow,turbo pressure and wastegate.
the wastegate goes from 30% to zero when the miss starts.What does this mean?

Attachment 58934


Regards Philip A

Also the airflow goes to zero at 4250 revs. I also previously had an airflow high fault previously.

Any chance you can attach the csv file from the recording session? It's a bit difficult to tell from the screen grab.

The MAF does seem to reading very high. 657 is very close on the edge of rolling over to 0 (not exactly sure but think 660 is the point the MAF reading overflows). Did you change the MAF for a VDO one?

Here is another dump

Attachment 58935

I have highlighted the funny readings in italics.
The boost pressure does not drop to 1 so the MAP looks OK
Its the MAF value and wastegate values that look very ODD.

Regards Philip A

C'mon post up the CSV.

These screen dumps of figures are a ****ing awful way to analyse the input recordings. I'm sick of squinting at the pics, it's giving me a headache. Post up the recorded file and I'll have a look.

I cannot attach a CSV file using the file attachment that is why I painfully converted it to a JPG image.
Do you know how to do it? It comes up as invalid format.
I can email it to you if you want. the file goes from startup then around the corner and a full throttle run followed by a normal 60KMh drive for say a kilometer.
AFAIK the MAF is original. I just cleaned it with contact cleaner.When it rolled over to 0 would it cause the motor to drop out?
Regards Philip A