MK5 Jetta 2.0 TDI Oil pressure warning

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andredp
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MK5 Jetta 2.0 TDI Oil pressure warning

Postby andredp » Tue Sep 18, 2012 7:19 am

Hi Everyone

Yesterday dropped off the SO and waited for her in the Jet listening to the radio. At one stage the radio switched off and then immediately on again, so thought nothing of it. Then drove off and after about 4km the alarms went off and an error message came on saying "STOP Oil pressure engine off", so I immediately pulled over and switched off. I checked oil level, it is fine, no leaks etc. Tried starting her again but the error kept on popping up. Check some wiring in the engine bay and after buggering around for about 5 minutes, got in again and she started as if nothing happened. Drove home (another 5km) without problems.

Let her stand for a while, checked the plug on the oil sensor on the filter housing, seems fine. Checked in general and saw that one of the water pipes was routed incorrectly underneath the airbox (car was serviced by VW a week or two ago), so I corrected this. started her up, all fine. Let her idel for a while and then after a few minutes she died. Started her again and after a minute or so she died again. As I tried to start her the errors popped up again and the dashboard did a christmas tree trick again. As this point I collected the fuel to burn it down, but rather locked up and left her to cool down. Checking on the center console, going into the "diag mode", the RPM seems to show 0 and the oil pressure also, even when I run on the starter a bit and get her running again. Usually she starts on the first turn, but when the errors comes up, she struggles a bit to start.

Anyway, later came out again, started her and she was back to normal. Pulled half way into the garage so I have lights, and check some of the wiring again and also some of the earth points. Disconnected the battery for a while, connected back up. started up again, everything normal. Went for a test drive, no problem.

Did some research on the web and tdiclub.com and it seems to mostly relate to either wiring or sensors, or actual oil pump failure. Thing is, the engine sounds normal, no noisy tappets or anything.

This morning everything back to normal I drove to the SO's work (10kms), and as we turned in so I could drop her off the christmas lights thing happened again. I switched off and pulled off again. Struggled a bit to get her started and drove for about 200m to where I drop the SO off. The warning message came on again but then disappeared as she started, but the oil level indicator still flashed and the check engine light stays on. At this point I should mention that the emissions check light has been on for a while, due to the intake flat valve being faulty. Not sure but I don't think this is related, since I have had that warning for about 3000km already, and it is only used for emissions control according to the web.

Anyway, switched her off, and dropped the wife off, waited for her to unlock and then started again. Same mission, lights etc on, but engine sounds fine. Drove the further 800m to my work and parked her.

So at this stage, any advice? The revcounter dies and the oil pressure or level warning stays on when this happens, but the car drove fine for the 800m. Does anyone know if there are more then one oil pressure sensor I can check?
Driving: 2006 Jetta 2.0 TDi Sportline
Upgrading: Lotus 7 replica - http://www.locostformula.co.za :D
Racing: Lotus 7 replica racecar - Ford bakkie engine with plastic inlet manifold ;)
Ex: Driving: 2001 Caddy Club, Citi Sonic, MKI 2 Door - 2L with ITBs tamed by PRS2, Toyo Corolla, MKIII Jet CLi, MKII Csl 1600, then 1800, then ..., MKII Gti 8V

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MK5 Jetta 2.0 TDI Oil pressure warning

Postby Sinbad » Tue Sep 18, 2012 8:02 am

Could actually be any of the engine canbus wires. Most likely one of them is shorting to ground somewhere. I had similar symptoms when one of my wheel speed sensor wires was rubbing on a driveshaft. The canbus shits itself.
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Re: MK5 Jetta 2.0 TDI Oil pressure warning

Postby panic-mechanic » Tue Sep 18, 2012 9:33 am

Sometimes also happens when the battery is on the way out.
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Re: MK5 Jetta 2.0 TDI Oil pressure warning

Postby joggiep » Tue Sep 18, 2012 9:38 am

panic-mechanic wrote:Sometimes also happens when the battery is on the way out.



Failing battery is a bloody funny thing... it caused all types of issues in my wifes Mini cabrio .. From the rear window demister not working to the roof not opening and closing to difficulty starting ... so ja in a rounds about way .. it would say it's an easy Item to get checked just in case.
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Re: MK5 Jetta 2.0 TDI Oil pressure warning

Postby andredp » Tue Sep 18, 2012 10:16 am

Thanx for the input gents, I need to get it scanned though to see what errors popped up.

From some research so far, this is the possibilities:

Mostly mentioned on TDIClub.com, Vortex and google:
* G28 Speed sensor faulty, but I will have to get it scanned to see if this is the error. Possibly G40 - Cam speed sensor, possible symptoms here: http://wiki.ross-tech.com/wiki/index.ph ... 321/000801
* Battery faulty - I doubt this, the car runs very strong on the starter, and this happened while driving?
* Wiring issue, see especially here: http://forums.tdiclub.com/showthread.php?t=239987 - possibly relates to what Sinbad experience - All MK5 owners should check this forum post out!
* Intake flap problem - I have this, but I cannot see this as being related
* EGR problems - same as above, cannot see how it can be related, but might do a delete kit in anycase, just need to find out who can "delete the code"
* Oil Pressure sensor(s) faulty - possible but unlikely from reading on the net

Will try and report back on findings.

PS, some pics here about the looms on the MK5 chafing: http://pics.tdiclub.com/showphoto.php?p ... cat=500%22
Driving: 2006 Jetta 2.0 TDi Sportline
Upgrading: Lotus 7 replica - http://www.locostformula.co.za :D
Racing: Lotus 7 replica racecar - Ford bakkie engine with plastic inlet manifold ;)
Ex: Driving: 2001 Caddy Club, Citi Sonic, MKI 2 Door - 2L with ITBs tamed by PRS2, Toyo Corolla, MKIII Jet CLi, MKII Csl 1600, then 1800, then ..., MKII Gti 8V

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Re: MK5 Jetta 2.0 TDI Oil pressure warning

Postby joggiep » Tue Sep 18, 2012 10:57 am

For giggels just get a load test done on the battery .. it's free at most battery places and then you can tick that box .
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EX - CARS
Jetta CSX 1.8 8v
Golf CTi 1.8 8v
Polo 1.6 lux
SEAT Ibiza Sport
VW Polo 2.0 Highline
BMW E90 320D
VW Caddy 2.0 8V
Nissan X-trail 2.0 dCi
VW Jetta 2.0 16V Turbo
VW Polo 1.6 Comfortline
CURRENT CARS
BMW 335
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Re: MK5 Jetta 2.0 TDI Oil pressure warning

Postby andredp » Tue Sep 25, 2012 10:25 am

Some updates in case it may help someone in future:

I have ruled out battery, since she starts perfectly and only throw a fit when the car warms up to temp. Cleaned the terminals and some ground points as a precaution.

I have checked the wire looms, and they do not seem to exhibit the same symptoms described on the TDIClub forum.

Yesterday I removed the EGR valve, and it is surprisingly clean for 150000kms. There is some soot covering the pipe, but no build-up like some of the recent posts on here. Some carb cleaner sorted most of it out without much fuss. Tested the valve functioning, all working fine.

Still driving the car around the last week or so, I have managed to consistently get the error as soon as she warms up. If coolant temps hit around 82 to 87 degs, she throws out the errors and go into limp mode, although she still drives without problems after dying for a second or two. I have read that the ESS (Engine speed sensors) can go faulty when getting hot, but this is also not consistent, since sometimes parking the car for a few minutes and then starting again she will run fine again for a while, even if the coolant is still hot.

I located the ESS yesterday, but flip I don't see how one gets in there to replace it, definitely not without removing the oil filter/oil cooler housing from the block. It is fitted with fine spline type bolts, which I don't have, so I might just take the car somewhere to get the sensor replaced. Has anyone done this before? Will report on findings.
Driving: 2006 Jetta 2.0 TDi Sportline
Upgrading: Lotus 7 replica - http://www.locostformula.co.za :D
Racing: Lotus 7 replica racecar - Ford bakkie engine with plastic inlet manifold ;)
Ex: Driving: 2001 Caddy Club, Citi Sonic, MKI 2 Door - 2L with ITBs tamed by PRS2, Toyo Corolla, MKIII Jet CLi, MKII Csl 1600, then 1800, then ..., MKII Gti 8V

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Re: MK5 Jetta 2.0 TDI Oil pressure warning - ESS replaced, f

Postby andredp » Fri Oct 05, 2012 6:46 am

Pics of uncleaned EGR valve:
Image
Image

So she has been getting progressively worse, with the sensor eventually only running ok until the engine is half warm. I got a quote from Denver as Midrand Workshop which seemed reasonable for the amount of work involved. Got a quote from VW also, just laughed at their quote. Denver scanned her and concluded that the sensor seems to be the problem. Car was booked in for wednesday, and the sensor was replaced. Glad to report that she is back to her old self.

Thank you Denver at Midrand Workshop for the good service :) You will see me again.

It is amazing how smooth this engine is for an oil burner if this sensor is doing it's job properly.
Driving: 2006 Jetta 2.0 TDi Sportline
Upgrading: Lotus 7 replica - http://www.locostformula.co.za :D
Racing: Lotus 7 replica racecar - Ford bakkie engine with plastic inlet manifold ;)
Ex: Driving: 2001 Caddy Club, Citi Sonic, MKI 2 Door - 2L with ITBs tamed by PRS2, Toyo Corolla, MKIII Jet CLi, MKII Csl 1600, then 1800, then ..., MKII Gti 8V

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Re: MK5 Jetta 2.0 TDI Oil pressure warning

Postby Gibbs » Wed Oct 10, 2012 10:25 am

Which sensor/s did you end up replacing?

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Re: MK5 Jetta 2.0 TDI Oil pressure warning

Postby andredp » Wed Oct 10, 2012 7:30 pm

Engine speed sensor(ESS), called G28 in the ECU/fault codes.
Driving: 2006 Jetta 2.0 TDi Sportline
Upgrading: Lotus 7 replica - http://www.locostformula.co.za :D
Racing: Lotus 7 replica racecar - Ford bakkie engine with plastic inlet manifold ;)
Ex: Driving: 2001 Caddy Club, Citi Sonic, MKI 2 Door - 2L with ITBs tamed by PRS2, Toyo Corolla, MKIII Jet CLi, MKII Csl 1600, then 1800, then ..., MKII Gti 8V

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