Xsara II 2.0 HDI 90 Fuelling Issues

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dave_xsara
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Xsara II 2.0 HDI 90 Fuelling Issues

Post by dave_xsara »

P1138
P0571
P0110

Got some others which did not return a code. Good only knows how is some of them are. I could not see a timestamp.
The pressure regulator was only changed a few months ago, so I hope that is not a new fault.

I'm not sure which of these faults caused it to go into limp mode a few weeks ago. All faults are still in the system. None have been cleared down yet.
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Re: Lexia install problem

Post by GiveMeABreak »

Make a note of the codes (which you have done), then read and clear each one, then run a Global Test and see what comes back.

Some of these are temporary faults and will clear when conditions allow.
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dave_xsara
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Re: Lexia install problem

Post by dave_xsara »

Yeah. I didn't get time tonight as I was just using it for first time.
I take it I can't monitor pressures at the injectors etc with lexia?
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Re: Lexia install problem

Post by GiveMeABreak »

Yes, no problems, you should be able to read that data no problem - this sort of thing from a C5 MK II (2005) that also uses Lexia from another user below.

You just select the injection ECU from the global test, and confirm. From there you will have access to other menus and one will be Parameters or Standard Parameter measurements or similar. Pick what you want and it will start measuring.

Engine speed: 288 rpm
Cam crank synchronization: yes
Fuel pressure reference: 251 bars
Fuel pressure measured: 94 bars
Open cycle ratio Pressure regulator: 48%
Open cycle ratio flow regulator: 40%
Injected flow measure: 12.34 mg/stroke
injector flow correction, cylinder 1: 93.33%
injector flow correction, cylinder 2: 93.33%
injector flow correction, cylinder 3: 97.25%
injector flow correction, cylinder 4: 116.08%
Pre injection advance: -0
main injection advance: -0
injection time: 1.03ms
Engine coolant temperature: 100 degree celcius
fuel temperature: 81 degree celcius
measured air flow: 322 mg/cp
atm pressure: 788 mbar
turbo pressure: 788 mbar
egr valve open cycle ratio : 0%
egr throttle electrovalve open cycle ratio: 10%
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Re: Lexia install problem

Post by Doo »

Two things I found with my install was the launch takes ages. It opens a box, then disappears for a while, then it appears and starts to do it's thing. My laptop is oldish, but it does work beautifully.

Our car is a 2007 C4 and DiagBox works on it.

I await my computer guy to install both DVD's on a different computer so I can do old & new stuff in time.

Anyway, I received excellent help from the guys on here, trust in them and you'll be fine 8-)

Good luck Dave :)
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dave_xsara
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Re: Lexia install problem

Post by dave_xsara »

Okay so I've now run the tests again and I've now only got one coded fault and a bsi fault.

P0110
Permanent fault, inlet air temperature signal. CAN value not plausible.
Note that the values presented are now different to that in in the previous post above from Sunday.

Non coded bsi fault
Evaporator temperature sensor sorry circuit to earth or short circuit to positive.
Note that this car has no air con.


Any suggestions? Looks like a new MAF is required.
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dave_xsara
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Re: Lexia install problem

Post by dave_xsara »

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?

Specifically related to the brake switch fault P0571 was that more likely to be a ghost fault due to another issue or an intermittent fault with the brake switch itself (i.e. brake switch is on its way out).

The MAF was replaced a few years ago by Citroen dealer and I believe that it is a combined IAT/MAF component. A bit crap this it is FUBAR already given the price of it. With this fault do I need to validate the wiring on the from the connector back to wherever it goes (I assume into the ECU)?
Is there a way to verify the operation of the IAT using a multimeter?
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Re: Lexia install problem

Post by Doo »

You "could" remove the MAF and spray it with switch cleaner to clean the sensor. Brake cleaner is exactly the same stuff and usually cheaper BTW :wink:

See if that helps the MAF. I have to do that to our wee Smart For Four as it conks out intermittently and usually in rush hour traffic :roll:

Failing that, buy a replacement MAF and fit it yourself for the cost of the part. The dealer is charging about £100PH :o
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Re: Lexia install problem

Post by Hell Razor5543 »

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
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dave_xsara
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Re: Lexia install problem

Post by dave_xsara »

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.
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Re: Lexia install problem

Post by dave_xsara »

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.
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Re: Lexia install problem

Post by Doo »

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:
Has anyone seen the plot? :?
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Re: Lexia install problem

Post by Hell Razor5543 »

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).
James
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Re: Lexia install problem

Post by Doo »

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-)
Has anyone seen the plot? :?
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GiveMeABreak
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C5 MK II 2.0 HDi Exclusive Obsidian Black
C5 MK I 2.0 HDi SX Wicked Red
Xantia S2 2.0 HDi SX Hermes Red
C15 Romahome White
XM 2.0 Turbo Prestige Emerald Green Pearlescent
XM 2.0 Turbo Prestige Polar White
XM 2.0 SX Polar White
CX 20 Polar White
GS 1220 Geranium Red
CX 2.4 Prestige C-Matic Nevada Beige
GS 1000 Cedreat Yellow
x 5646

Re: Lexia install problem

Post by GiveMeABreak »

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.
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