Emergency air up instructions

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Originally Posted by BradC

Just to clarify this. The test on startup is measuring tank pressure. It opens the reservoir valve which brings the gallery pressure up. This is measured and if it's less than about 1 bar from set point, then it'll close the valve, vent the gallery, start the compressor then open the reservoir valve to pump it back up.

If it is within 1 bar of set point then it'll just shut the reservoir valve and vent the gallery.

In my D3 I get about 3 measurement cycles before the pressure drops enough to require topping up.

During that process, it applies all sanity checks, so as you say if the gallery doesn't vent when the ECU tries to then it'll throw a code.

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Yeah, I was reflecting on this overnight too, and I was thinking the same thing, there's an in between step where it is checking the tank pressure before checking the venting system, and after those 2 checking the pump and running it if needed. The interesting thing is that if any one fails, it doesnt seem to go onto test the next one, if vent fails, it throws error and doesnt check the pump.

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Originally Posted by discomatt69

I would be close to flying home and selling the car if had a trip which involved as much stuffing around as you have put up with
each to their own

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I know the feeling, its been stressful, but we were potentially quite stuck, in a remote outback national park, that nrma potentially could have rejected recovering us from due to distance and access.

It was something I had prepared for, as we did do a day trip into the simpson, so was determined to at least attempt self recovery, it is the end of our 2 month caravan trip, and I wasnt about to let this ruin the end of a great trip, by potentially costing us thousands in towing and repair bills and delay us possibly a week, when i have a spare at home that we can just drive home to get it :)

In terms of the things ive had to fix on cars, this was one of the easiest.

Double post.

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Originally Posted by discomatt69

Fair enough, my definition of vital is the fun time to be had while on holiday not stuffing around with a car.
I would be close to flying home and selling the car if had a trip which involved as much stuffing around as you have put up with
each to their own

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As the saying goes, everyone should have a hobby, and this thread could be very useful to someone someday.

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Originally Posted by RANDLOVER

As the saying goes, everyone should have a hobby, and this thread could be very useful to someone someday.

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Sounds more like a full time job [emoji1787]

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Originally Posted by haydent

The interesting thing is that if any one fails, it doesnt seem to go onto test the next one, if vent fails, it throws error and doesnt check the pump.

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Which makes perfect sense. If it can't get air out of the gallery it's not going to want to put more in there. I had forgotten about the pump test after the pressure measurement. Pump on into a closed gallery to ensure it sees a pressure rise then vent. Of course the venting at the end of these procedures was a mid-run software upgrade. The early software didn't do that and left the gallery at whatever pressure it was at. That was causing pump wear/failure when repeatedly trying to start into a 16 bar head pressure, so they modified the software to ensure the gallery was less than a couple of bar absolute (so always positive to atmospheric to prevent moisture ingress if there was a problem).

There's a post somewhere where I lay out the actual process with relevant pressures. When I was diagnosing my system I spent a lot of time logging, observing and cross referencing both the training manual and the service manual to document exactly what it does. Of course I can't find it now.

You've managed pretty well, and yes there is some information in this thread that needs to be summarised in a sticky because the likelihood is it will help someone one day.

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Originally Posted by RANDLOVER

As the saying goes, everyone should have a hobby, and this thread could be very useful to someone someday.

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Absolutely this thread will be of great assistance to someone one day, I just hope and pray it's not me and am happy to spend cash on preventative maintenance to reduce the chance of me swearing at the much loved touring beast