Lexia install problem

This is the place for all your Diagnostic related questions or advice.

Moderator: RichardW

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 06 Oct 2019, 15:01

I've cleaned it using proper MAF cleaner yesterday and took it out for a drive. Will try it on the diagnostics later and report back.

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 06 Oct 2019, 16:11

Fault P0110 still there. Old faults relating to a previous ECU are still being declared desipte being deleted numerous times. When I delete them and rescan they dissapear. However, when I subsequently open a fresh session they are back again.
The displayed outside temp on the in-car display seems correct - I assume that it comes from the same source. I didn't see anything in the side mirrors when removing the covers.

Is there a problem with the injector 4 flow correction value - seems out of step with the others.
Attachments
IMG_20191006_152139.jpg
IMG_20191006_152240.jpg
IMG_20191006_152312.jpg
IMG_20191006_152435.jpg
IMG_20191006_152507.jpg

User avatar
Doo
Posts: 87
Joined: 09 Sep 2019, 16:53
x 24

Re: Lexia install problem

Post by Doo » 06 Oct 2019, 21:05

Hell Razor5543 wrote:
06 Oct 2019, 14:56
Make sure, if you ARE going to clean the MAF, you are very careful. There may be a sensor wire that is hair thin, and if it was hit by a jet of cleaning fluid it could break.

Some switch cleaners also have a lubricant which would also stop the MAF working, as it would leave a layer of lubricant behind, replacing any dirt that was removed! :D
Although, if it can handle sucking in air at full throttle, surely a little blast from a tin should be ok as long as it is drizzled in and allowed to evaporate :wink:

Hell Razor5543
NOT Alistair or Simon
Posts: 9423
Joined: 01 Apr 2012, 09:47
x 651

Re: Lexia install problem

Post by Hell Razor5543 » 06 Oct 2019, 21:18

Doo wrote:
06 Oct 2019, 21:05
Hell Razor5543 wrote:
06 Oct 2019, 14:56
Make sure, if you ARE going to clean the MAF, you are very careful. There may be a sensor wire that is hair thin, and if it was hit by a jet of cleaning fluid it could break.

Some switch cleaners also have a lubricant which would also stop the MAF working, as it would leave a layer of lubricant behind, replacing any dirt that was removed! :D
Although, if it can handle sucking in air at full throttle, surely a little blast from a tin should be ok as long as it is drizzled in and allowed to evaporate :wink:
That is air that has been through a filter, so is clean with no dirty particles travelling at speed. A jet of cleaner moving at speed has weight, and can break that wire (although if it is a gentle drizzle that should be OK).

User avatar
Doo
Posts: 87
Joined: 09 Sep 2019, 16:53
x 24

Re: Lexia install problem

Post by Doo » 06 Oct 2019, 21:34

Hell Razor5543 wrote:
06 Oct 2019, 21:18
Doo wrote:
06 Oct 2019, 21:05
Hell Razor5543 wrote:
06 Oct 2019, 14:56
Make sure, if you ARE going to clean the MAF, you are very careful. There may be a sensor wire that is hair thin, and if it was hit by a jet of cleaning fluid it could break.

Some switch cleaners also have a lubricant which would also stop the MAF working, as it would leave a layer of lubricant behind, replacing any dirt that was removed! :D
Although, if it can handle sucking in air at full throttle, surely a little blast from a tin should be ok as long as it is drizzled in and allowed to evaporate :wink:
That is air that has been through a filter, so is clean with no dirty particles travelling at speed. A jet of cleaner moving at speed has weight, and can break that wire (although if it is a gentle drizzle that should be OK).
Agreed 8-)

User avatar
GiveMeABreak
Forum Admin Team
Posts: 16379
Joined: 15 Sep 2015, 19:38
x 1531

Re: Lexia install problem

Post by GiveMeABreak » 06 Oct 2019, 21:47

dave_xsara wrote:
05 Oct 2019, 20:26
When I cleared down the BSI faults it redeclared two faults which were specific to the previous ECU.
Why would it still be holding on to them after clearing them down twice?
Because the fault is still being triggered. Clearing faults is fine - but if the triggering conditions are still there it will still throw the fault code until the problem is resolved. Depending on what the fault was, it may take a little while for the engine management to record new data and 'settle down' - but it does depend on what it is.

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 06 Oct 2019, 22:56

I connected, scanned and read the faults, then clear them. Rescan for faults and only the evaporator and the IAT remain.
All good.
Next day I've came back, connected and scanned and they are all back again.
The faults are those on page 1 from last Sunday.

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 07 Oct 2019, 12:28

Any ideas as to where to go from here? The diagnostics shows that the both sensor supply voltages (1=camshaft, 2=others) is 4.99V which is correct. I guess I need to ensure that this 5V supply is getting to the sensor and then do a continuity check on the wiring back to the harness input to the ECU.
How do I ensure that both the IAT and the MAF are correctly operating?
The resources online state don't buy a new sensor unless it is proven to be faulty.

User avatar
GiveMeABreak
Forum Admin Team
Posts: 16379
Joined: 15 Sep 2015, 19:38
x 1531

Re: Lexia install problem

Post by GiveMeABreak » 07 Oct 2019, 12:43

I'll have another look - I'm just catching up with posts as I was off line for most of yesterday sorting out networking issues at home.

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 07 Oct 2019, 13:09

GiveMeABreak wrote:
07 Oct 2019, 12:43
I'll have another look - I'm just catching up with posts as I was off line for most of yesterday sorting out networking issues at home.
No rush - I wasn't posting for anyone in particular to respond to. Partially documenting my thoughts for when I get some more time to go and investigate it.

User avatar
GiveMeABreak
Forum Admin Team
Posts: 16379
Joined: 15 Sep 2015, 19:38
x 1531

Re: Lexia install problem

Post by GiveMeABreak » 07 Oct 2019, 15:17

Unfortunately early diesel codes for your Bosch system on a DW10D engine are not readily available, so I would delve into the fault code on your Lexia - by seeing what info (if any) it has.

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 07 Oct 2019, 17:33

Okay thanks.

I've been in contact with some folk and the advice is as follows:

1. Injector 4 is kaput. Correction values should be less than 1.5.
2. Connect up the Lexia and drive about whilst monitoring the IAT value and check that it varies in accordance with the outside temp.

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 07 Oct 2019, 21:51

I don't have my Lexia laptop with me during the week, so hopefully someone can answer this question:
How much data can the Lexia logging file hold (I assume it logs all ECU data over the timeframe) and can it be viewed/presented outside of Lexia? If not can it be presented graphically in Lexia? Does the 5 green traffic lights indicate it can store up to five sets of logging data?
Apologies, I know this information should be in the manual and I'll be able to check at the weekend, but I thought I'd ask now so I can hit the ground running on Sunday.

Does the 'Main Brake Signal' in the drivers information screen refer to switch coming off the brake pedal?


Thanks.

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 09 Oct 2019, 20:18

Can someone provide me with a diagram showing the location of injector 4?
I presume it is 1 to 4 left to right as you look into the engine bay - i.e. injector 4 is closest to passenger side.
Or does it go 1 to 4 from the gearbox side? I've seen both.

Edit: I've checked the Mechanics Handbook for the Xsara that is in the Citroen subforum and if I've understood it correctly, the DW10D engine has the RHY code. Pages 76 & 77 show the cylinder head, but do not display the cylinder numbers.
The TU/TUD engine on pg 67 shows cylinder numbers but does not note if the numbering relates to all.

I believe I can disconnect the injector and check from the Lexia, but is there another way?

dave_xsara
Posts: 216
Joined: 24 Nov 2010, 22:35
x 6

Re: Lexia install problem

Post by dave_xsara » 12 Oct 2019, 21:24

What does the main brake signal refer to in the driving information screen?
When I press the brake, the indication does not change from released. The exterior brake lights work fine.
Should pressing the brake switch change the 'Main Brake Signal' indication?
The info screen states that it is the 'information given by the vehicle brake pedal sensor'.
The redundant brake signal is used for the cruise control.
The clutch indication works fine.

Injected flow ref is 9mm3/stroke. Ref States 5 - 7 mm3/stroke.
Accelerator pedal hard spot signal 2 is pressed. Ref States or should be released.
Difference between measured and ref fuel pressure -6 bar. Should be 0.
Injected fuel flow reference is 12mm3/stroke. Should be between 5 and 7.
After warming , injectors 1 and 2 are .0.59mm3/stroke and -0.43 respectively. 3 is 1.9 and 4 is 2.3.
Measured air flow is 441.1mg/cp. Should be between 200 - 290mg/cp.
Fuel pressure regulator current is 520mA. Should be between 600-630mA.
Pre injection advance is +13deg. Should be between -11 and -9.
Main injection advance is 1deg. Should be between 3 and 4.
3rd piston deactivation is yes. Should be no.
Injected flow ref is 10mm3/stroke. Should be between 5 and 7.
Exhaust gas recycling valve electrovalve open cycle ratio is 5% . should be between 70 - 95.
Exhaust gas recycling throttle electrovalve open cycle ratio is 5%. Should be between 64 and 70.


Sorry for the formatting, on phone in garage at the minute.