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Author Topic: Live data on cheap code reader  (Read 3802 times)

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shyboy

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Live data on cheap code reader
« on: 10 August 2017, 11:28:40 »

My Autel AL 319 reader gives me good info. on stored and pending codes and seems to give good live data also.
I haven't got a clue how to interpret a lot of this however., and hope someone can clarify a couple of things.
On Live data, I get a MAF reading at tickover, (varying between 645 and 675 rpm approx.), of .57lb/s. This doesn't change with increased throttle settings.Should this figure remain unchanged and is that reading normal? I haven't done a driving cycle with the reader attached because the cover can't be closed with the reader in its socket above the footwell and it wouldn't be safe.
There is a reading for Fuel 1 and Fuel 2, which I presume is because of the LPG set-up. Fuel 1 Reads 'clr' (? clear), but fuel 2 reads 'fault', presumably because it is identifying that the LPG system is currently not working. Am I right in this assumption, please?
Is there anywhere I can find a means of learning what all the other 'gobbledegook' readings mean?
Thanks.

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Marks DTM Calib

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Re: Live data on cheap code reader
« Reply #1 on: 10 August 2017, 12:04:35 »

so 250g/s which is huge (about 12 rings a bell!) plus it should change when revved
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omegod

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Re: Live data on cheap code reader
« Reply #2 on: 10 August 2017, 14:30:23 »

The fusebox cover removes quite easily Bill, been there and done it with a 2.2
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Andy H

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Re: Live data on cheap code reader
« Reply #3 on: 10 August 2017, 14:55:29 »

The V6 uses lambda sensors on bank 1 (drivers side) and bank 2 (passenger side) to adjust the fuel trims. The main engine ECU knows nothing about the LPG as there is no communication between the two ECUs.

Fuel 2 fault probably means that the long term  fuel trim is out of limits but it might mean that the lambda sensor is goosed on that side.

What fault codes are you getting?

Edit - don't trust anything a cheap code reader tells you......
« Last Edit: 10 August 2017, 14:58:08 by Andy H »
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Kevin Wood

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Re: Live data on cheap code reader
« Reply #4 on: 10 August 2017, 15:22:28 »

If the MAF is misreading as badly as the live data suggests, I wouldn't be surprised to see fuel trim codes. The ECU is probably disregarding it and running on a limp-home strategy.

Probably best to sort the MAF before messing with anything else.
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omega2018

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Re: Live data on cheap code reader
« Reply #5 on: 10 August 2017, 17:34:25 »

.57lb/s seems either a little or massively high for MAF mine was at idle 0.46    lb/min

see my readings here
http://www.omegaowners.com/forum/index.php?topic=139765.msg1807500#msg1807500

and here
http://www.omegaowners.com/forum/index.php?topic=139765.msg1808746#msg1808746
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shyboy

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Re: Live data on cheap code reader
« Reply #6 on: 10 August 2017, 18:25:29 »

Thanks for the info.
Omegod.  I'll take the fuse box cover off but will be tempted to bin it if I can't sort things soon.  ;D
Migmog.  I missed your saga but am now trying to absorb the details. Most of it is a foreign language but I'm trying to learn. Thanks for the pointers anyway.
Fuse 19. From what you say it sounds as if the MAF is goosed but the car's leaving for France on Saturday. Keeping my fingers crossed for my son and his family.
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shyboy

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Re: Live data on cheap code reader
« Reply #7 on: 10 August 2017, 18:35:30 »

Andy H. Sorry. I meant to say that I now have only the following Codes.
P0100  MAF?
P0150  O2 sensor
P0155  O2 sensor
I've got rid of the misfire codes mentioned in my other thread by changing the 2,4,6 bank coil pack. Car's running OK but still throwing up the above codes as 'pending'.
Sorry if this is all a bit vague. I really don't have the knowledge to make too many sensible deductions from what I'm seeing and it is a cheapo code reader.   :'(
So far all the code readings have agreed with those obtained by the pedal trick.
« Last Edit: 10 August 2017, 18:37:20 by shyboy »
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Re: Live data on cheap code reader
« Reply #8 on: 10 August 2017, 18:41:08 »

Unplug the maf. Does it run better?

If yes fit a new one. If no, plug it back in. :y
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Re: Live data on cheap code reader
« Reply #9 on: 10 August 2017, 18:53:01 »

so 250g/s which is huge (about 12 rings a bell!) plus it should change when revved
You're thinking 12kg/hr, which is in right ballpark for a 4 port, 13-14kg/hr is about right for v6.



The ops 0.5lb/s is about 50,000kg/hr, clearly 'dangle berries'.
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shyboy

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Re: Live data on cheap code reader
« Reply #10 on: 10 August 2017, 20:36:52 »

Misfires (and associated codes) and rough idle have completely disappeared since coil pack changed and she's running nicely now so that must have been the main problem. (See note below).
Still have a static MAF reading of 256.75kg/s in metric which I gather is nonsense. I don't want to fiddle any more before it goes off to the continent as it's running well and I just hope it behaves. A new MAF is on the cards for when (if) it returns.  :o
Note for info. only.I had a devil of a job re-inserting the coil pack plug fully and ended up having to remove the plastic shroud surrounding it, and it then just slipped in as it should. I presume the shroud is intended to protect the plug as it is pushed (or pulled) into position and to prevent the retaining clip from coming adrift in use, but it definitely stopped the plug going fully home. The 1,3,5 bank shroud was already broken and therefore a loose fit round the plug body so presumably someone else had had the same problem.
I wonder if this was a contributory factor in the malfunctioning of the coil pack?
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omega2018

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Re: Live data on cheap code reader
« Reply #11 on: 11 August 2017, 01:02:11 »

my MAF is still working fine 3 months after i gently cleaned it by emptying a tin of contact cleaner on it.  i used WD40 brand "Fast Drying Contact Cleaner" (NOT WD40 oil) which "leaves no residue" http://www.ebay.co.uk/itm/191944717877 .
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shyboy

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Re: Live data on cheap code reader
« Reply #12 on: 11 August 2017, 08:00:46 »

Hi Migmog,
It looks as if I've got nothing to lose by doing what you did. When the car comes back from France ( 'always be optimistic' my old Mum used to say), in a fortnight, it will be a second, non-essential transport, so at the risk of incurring the wrath and ridicule of Jaime and other wise people on here I'll give it a go. I've accepted that it might have to be replaced anyway. Thanks again.
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Re: Live data on cheap code reader
« Reply #13 on: 11 August 2017, 08:17:12 »

If the MAF was varying I would say give it a clean, its not so its a bit more fundamental!

As for running with the MAF as it is, its not a great idea for such a long journey and could result in costly CAT damage (its running on a default map and not closed loop) and much increased fuel costs (which would cover the cost of a MAF)
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Andy H

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Re: Live data on cheap code reader
« Reply #14 on: 11 August 2017, 09:37:51 »

If the MAF was varying I would say give it a clean, its not so its a bit more fundamental!

As for running with the MAF as it is, its not a great idea for such a long journey and could result in costly CAT damage (its running on a default map and not closed loop) and much increased fuel costs (which would cover the cost of a MAF)
The thing that makes me feel very uncomfortable about the MAF reading is that the number is ridiculously large - so large that I don't have any confidence that the code reader is even reading the correct sensor :-\

If I was going on a long journey I would definitely want to try a different code reader or a known good MAF first to confirm that the code reader had found a real problem.

If the MAF is faulty then I wouldn't want to drive any distance without replacing it.
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shyboy

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Re: Live data on cheap code reader
« Reply #15 on: 11 August 2017, 09:57:34 »

Thanks for the advice. The MAF is being replaced later today, as we don't have time to do anything else. Fingers crossed.
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Re: Live data on cheap code reader
« Reply #16 on: 11 August 2017, 10:18:46 »

Do we have any confidence that the code reader concerned reports the MAF correctly under normal circumstances?

Might be worth trying it on another Omega or getting this Omega to a tech 2 to be sure.

Does the code reader report the raw MAF value, or the voltage?
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shyboy

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Re: Live data on cheap code reader
« Reply #17 on: 11 August 2017, 16:14:23 »

Thanks for your interest, gents.
The MAF has been replaced with a Bosch item which was supplied by a good motor factor in a Bosch box. We had no time to get one from the local Vauxhall dealer, but the hopefully good news is that this one is obviously working and varying with revs.
There is no MIL showing and the MAF code has disappeared leaving P0150 and P0155.
I am not with the car now, but the first reading on tick-over was 3.0g/s, which went as high as 10/11/12g with increased revs. and after a 4 mile run the reading was between 3.5 and 4g on tick-over. I can't recall whether this was with AC on or off I'm afraid.
No option now but to let the car go to France and hope for the best. My son is competent enough to get help abroad if necessary but I hope he doesn't have that hassle.
Thanks again.
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Re: Live data on cheap code reader
« Reply #18 on: 11 August 2017, 16:24:12 »

Those readings sound about right to me. Sounds like it's fixed and you can depart with confidence. :y
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Re: Live data on cheap code reader
« Reply #19 on: 11 August 2017, 16:36:58 »

P0150 is bank 2 sensor 1 lambda sensor not giving a useful reading and P0155 is that the heater for that sensor isn't working.

It needs fixing but it might not be a big problem in the short term if the MAF error caused the long term fuel trims to be reset.
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shyboy

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Re: Live data on cheap code reader
« Reply #20 on: 11 August 2017, 16:42:31 »

Thanks Kevin, and Andy H and everyone else for your help and interest.The old girl's driving beautifully now.
I'll tackle the remaining problems when it gets back.
Thank you all again. I've learned a lot in the past week.
Another great commendation for this Forum.
« Last Edit: 11 August 2017, 16:46:56 by shyboy »
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Re: Live data on cheap code reader
« Reply #21 on: 11 August 2017, 21:12:27 »

Congratulations, shyboy. I'll wager you didn't know what you were taking on when you embarked on your first cam belt change job at 77. We didn't know then that your son was taking the car onto the continent in 4 weeks time, and that you might stumble into more problems. It sounds like the MAF senor was the problem, and it has arrived in the nick of time.

I wish your lad a good and trouble free holiday. I hope he appreciates your efforts.
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shyboy

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Re: Live data on cheap code reader
« Reply #22 on: 11 August 2017, 21:32:36 »

Cheers, TP.
You're right of course about unearthing unexpected difficulties but I enjoyed every minute of it and obtained a great sense of achievement and acquired knowledge.
The really nice part of it all was finding so many people, not all of whom are known to me personally, who were prepared to offer help, advice and encouragement.
God forbid that I ever have to look after as many Miggies as you do.
We have two superb sons, each of whom always appreciates what we do for them. Won't be long before the boot has to be on the other foot, though.  ;D
Cheers,
Bill.
« Last Edit: 11 August 2017, 21:35:23 by shyboy »
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shyboy

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Re: Live data on cheap code reader
« Reply #23 on: 21 September 2017, 17:54:52 »

Just an update on this one.
The car went to France and Belgium without a hitch so it was clearly the MAF which was the main problem.
However, on it's return journey from Dover, the traction control light came on and it came home in 'limp mode' with no auto selector lights on or sport mode working.
I'm going to have to start a new thread about this in the near future after I've gleaned all the knowledge I can on this particular subject.
Hopefully I'll be able to crack this also with help from the experts on here. Thankfully the car isn't an essential daily transport so I can take my time.
Cheers,
Bill. 
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shyboy

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Re: Live data on cheap code reader
« Reply #24 on: 26 September 2017, 09:10:25 »

It's not worth starting a new thread on this one but the following might be useful to my fellow 'less experienced' members on here.
Having read up on the ins and outs of the apparent TC and ABS problems after the vehicle's return from France, I went outside last night to prepare things for getting underneath today to try to sort things out. The first thing I did was to re-read the handbook and suddenly realised that there is a fuse (No. 9) for the auto transmission, and lo and behold, it had blown. All adverse symptoms eliminated with one simple procedure.  ::)
It hasn't blown again, so I'm wondering what might have caused this in the first place. When the symptoms occurred the car had been towing from Bruges, for a couple of hours in very hot weather, with a break on the ferry of course. Could this have been a contributory factor or is it more likely just one of those times when a fuse gives up for no apparent reason.
Anyone got experience of this? The ATF is going to be changed imminently as a normal service item anyway.
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TheBoy

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Re: Live data on cheap code reader
« Reply #25 on: 27 September 2017, 18:17:56 »

This happened to the chap from Leeds, who's name escapes me (used to come to Lakes meets, with his wife Winnie, who was in a chair)
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Re: Live data on cheap code reader
« Reply #26 on: 28 September 2017, 11:33:25 »

This happened to the chap from Leeds, who's name escapes me (used to come to Lakes meets, with his wife Winnie, who was in a chair)
Cliffo B :y
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Re: Live data on cheap code reader
« Reply #27 on: 29 September 2017, 18:58:18 »

This happened to the chap from Leeds, who's name escapes me (used to come to Lakes meets, with his wife Winnie, who was in a chair)
Cliffo B :y
That's the chap :)
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