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850 / S70 & V70 '96-'99 / C70 '97-'05 General Forum for the 850 and P80-platform 70-series models |
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AAAGH! Car won't start. PNP switch?Views : 1011 Replies : 4Users Viewing This Thread : |
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May 4th, 2013, 16:07 | #1 |
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AAAGH! Car won't start. PNP switch?
Hi -
Help! My V70 TDI has decided to stop starting as it were. The symptoms are as of this morning the car didnt start first time - it started, stalled then wouldnt start for about 10 seconds. I left it then retried - fine. I then drove the car for about 10 miles today and when i went to restart it wouldnt start. Again left for 5 mins it started. So drove home, getting a fuel filter on the way, and left it running with the better half in the car. got back home, changed the fuel filter it started first time run for about 15 seconds then as soon as i touched the transmission it stalled. Also it wouldnt then even pressing the shiftlock bypass button down come out of park very odd. The car was driving when it started perfectly with full gearbox function. Now it wont start and the orange arrow i note is on while i crank the car. Does this sound like a faulty PNP switch? HELP!!!!
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1999 C70 T5 GT ME7 |
May 4th, 2013, 18:26 | #2 |
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Sounds like possible PNP switch to me - try running the gearlever rapidly back and forth through the gears (engine off) to see if it clears it. If it does, then that's the problem and it'll need dismantling to clean/sort properly.
Just a thought! Cheers
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May 5th, 2013, 07:26 | #3 |
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Last Online: Jan 3rd, 2020 00:42
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Location: NB, Canada
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The PNP switch will disable the starter while the car is in anything but P or N. If the car cranks at all it's unlikely to be the PNP switch causing your engine problems.
The PNP could certainly have an issue (hence the orange arrow) and checking the codes will help in that regard, but it won't make a running car stop and shouldn't contribute to erratic engine conditions. Chris...
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May 5th, 2013, 10:09 | #4 |
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Last Online: Feb 20th, 2019 18:16
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Cheers - I think we had a "false negative" result there as I had some air in the diesel when restarting.
So my thoughts now are either Air in Diesel getting in through one of the underbonnet fuel hoses, or fuel pump belt timing has moved/slipped.
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1999 C70 T5 GT ME7 |
May 6th, 2013, 22:29 | #5 |
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Last Online: Feb 20th, 2019 18:16
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bit of an update -
The filter change was a false negative as the air was in the system. I got all the air out the car finally by means of filling the filter fully by undoing the bleed screw and filling it with diesel via a small funnel. So it may well have been the filter that needed changing all along. this improved things - i.e. it was starting first time - also at the same time I had read some things about the "fuel pump relay" which is apparantly a potential issue on these - although I feel actually this may be referring to the red relay that goes on the petrol models - the TDI not having a lift pump. anyhoo - I looked under the "main fuses" box and swapped the "Glow Plug" and "Main Engine Control" blue relays over and the engine seems to instantly be starting better. This may be a placebo or it may mean my relay was a bit weak. Either way i will keep an eye on things.
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1999 C70 T5 GT ME7 |
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