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Suzuki Grand Vitara 2lt TD rail pressure sensor error/immobiliser error

Posted By btbw 10/21/2009 12:26:30 PM
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Suzuki Grand Vitara 2lt TD rail pressure sensor error/immobiliser...

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btbw
 Posted 10/21/2009 12:26:30 PM
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Here goes,


Suzuki Grand Vitara 51 reg, 2ltr TD peugeot hdi engine

A month back, the engine management light popped on, and the car entered limp home mode (i hate that mode!!!)

Took it to a local garage which i trust, they sent it to a diesel specialist as it was reporting an error with the lift fuel pump.
Lift pump and a injector replaced as i did a really good job at breaking it, the garage also cleaned out the fuel lines, and the tank, replaced the filter due to the pump breaking up.

Picked the car up, and after 20 + mile engine management light pops up again, and limp home mode again. This time its reporting a error with the rail pressure sensor/immobiliser.
Rail pressure sensor has been replaced, same issue.
The garage cant get to the bottom of it, they have check the injectors, one injector does appear to be slightly excessive. Unfortunately this one is stuck and cant be removed from the engine, even after a week of trying.

They have had a auto electrician look at things, whom thinks it may be the ECU, but wont commit either way.

The garage actually recommended checking with you guys if I had time, as its got them stumped. To date they have been a good bunch of guys, so im just looking for any help to point us in the right direction.

Is it likely to be the ECU? Every time it started, it stalls out giving the 2 same errors, except if its rev'd a few times, then it ticks over with no issues. Just would appear to be strange to get both codes, both times...

Problem is it cant be driven as limp home mode is just too unpredictable and dangerous.

Sorry dont have the code numbers to hand, but I know the garage is planning to log on later tonight, so hopefully he will be able to update the post with the codes.

Would be nice to get the car back working, as such im looking for any ideas/help possible.


Oh yeah, dont trust the dealership as they attempted to charge £1900 3 years back to replace the whole fuel system when it was a grabbing break causing a loss of mileageAngry...
Angus
 Posted 10/21/2009 12:36:59 PM
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btbw

Welcome to the forum.

The actual code numbers will be essential as none have definitions expressed in those terms.  The leak-off test 4 volumes would help too.

The ECU doesn't even have any monitoring of the low-pressure pump or pressure, so any code of that nature [often P0230] is extrapolated from the rail sensor's reading when combined with the fuel regulator's duty cycle.

.

btbw
 Posted 10/21/2009 12:45:38 PM
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Thanks for the quick reply -
I can remember the pressure sensor one come to think of it, P0191 (its my local phone dial code) but Ill have to wait for the garage to log on later this evening/when I speak to them in the morning for the other.

In the interim - if anyone wants to take a shot in the dark, you cant do any harm.... at the moment its heading for the big scrap heap in the sky out of sheer frustration.
Angus
 Posted 10/21/2009 1:49:00 PM
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bt

P0191 - Fuel Rail Pressure Sensor Circuit Range/Performance.

That code is in no way an instruction to change any component.  It indicates that the rail pressure was reported as being outside the expected values.

Guesswork will get you nowhere on a complex system like an HDi.  Either you know them - or you leave them be.

When you get that code on an HDi you carry out an injector leak-off rate test - the results of that are the next crucial bit of info.

.

wor-mate
 Posted 10/21/2009 3:13:07 PM
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from the info you have provided i would be guided to the siezed in injector. as the corrosion builds between the injector and head, it tends to have a compressing/squeezing effect over the most critical area which houses the spray nozzle, because the working clearance in the injector is so small any change in size can cause the injector to malfunction. now comes the bad part, on many alloy head engines the corrosion that forms in the aforementioned area is equivalent to it being permanently welded and many times the head or engine has to be scrapped. there has been a release of heavy duty injector pullers for sale, if the injector wont move with a couple of swings with one dont waste time, start looking for a head or engine. there have been many suggestions ref using coca cola etc forget it ive tried them all and none work. i also had one head where i had the injectors spark eroded out but that cost £200.00 more than a new head from main dealer !. 
locrep
 Posted 10/21/2009 5:31:04 PM
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**The garage cant get to the bottom of it, they have check the injectors, one injector does appear to be slightly excessive. Unfortunately this one is stuck and cant be removed from the engine, even after a week of trying.**

Reading the above statement points towards a leak off test needing to be performed.


SmileIf everything is coming your way, you are in the wrong laneSmile

btbw
 Posted 10/22/2009 7:23:59 AM
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Thanks to all for the replies.

Spoken with the Garage, the errors that have been popping up are as follows:

P1138 - Only Once
P0235
P1517

The ones which are constantly coming back are P1517 and P0191

Im more interested in the thoughts for P1517 as until this is cleared I can see how we are going to move forward.

Ive started pricing up for a replacement head, so thanks for all the help.

Oh - I forgot to state that the leak of test was performed, that is how the garage has started looking at the injector - though it is only slightly excessive....
10/22/2009 7:33:29 AM by btbw
Angus
 Posted 10/22/2009 8:25:46 AM
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bt

P0235 - EDC15C2 - Turbo pressure signal, consistency with atmospheric pressure.  Possible MAP sensor signal fault - what is it reading at key-on engine off?

P1138 - EDC15C2 - Fuel pressure. Stop requested but regulator still active.  Fuel pressure reading fault.

P1517 - EDC15C2 - Coded anti-start function.  Immobilizer fault of some kind?

Only the top two [and P0191] will cause limp-home.

What's the engine code on this one?  RHZ or RHW?  8-valve or 16?

.

btbw
 Posted 10/22/2009 8:36:49 AM
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Its a RHZ 8 valve

Just interested on everyone's thoughts - as it all started the same time - never had any issues with any of it at all before....

The immobiliser is making it hard for any diagnostics as it keeps cutting the engine, though the electrician the guarage has used cant find any issues.

Are we suggesting that the unit has failed? If so, why is it allowing the engine to start.

Im no mechanic, just looking for ideas ... as the garage are thinking about getting the ecu checked as they dont believe that the injector is excessive enough to cause issues....

Thanks again...
10/22/2009 8:39:55 AM by btbw
wor-mate
 Posted 10/22/2009 9:19:05 AM
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i am aware the engine wont run for long but would go back to taking live data on the rail pressure, it will be the best guide, if you could post the pressures you will receive more advise.  

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