Reply With QuoteFirst thing to replace is the dessicant in the air drier.
That's what usually causes this fault first, if you don't dry it out or replace it, it will then ruin the compressor.
Master
Supporterhey guys
I'm hoping someone has a good knowledge of how the air suspension system works to help diagnose this error.
If I start the car and select off road height it rises very efficiently (like new) but then about 2 minutes later (or less) it says "Suspension fault" and using my nanocom it gives 'P0087'.
P0087 code is "reservoir filling too slowly" - from reading this usually means either:
1) a leak between the compressor and the reservoir - I've sprayed soap all over the lines and no bubbles were apparent.
2) a worn out compressor..
- The only issue I can find when taking apart the compressor (I've replaced most rubber seals) is the piston seems to glide very easily up and down in the chamber with only a little bit of friction, i'm not sure how much friction there should be but I'm imagining it should be quite firm to make it air tight??
So my head says that part is faulty thus a new pump is in order but if it is so bad then how is the car able to rise so fast still? Or, does the car rise based on the reservoir and then its just telling me that it is taking ages to replenish that air?
Lastly, could it be something else? I noticed there is a valve between the compressor and reservoir, what is its role and could it be involved in the error some how?
I assume I can discount all other air-lines as the car does not drop at all overnight?
any/all help appreciated.
Master
SupporterFirst thing to replace is the dessicant in the air drier.
That's what usually causes this fault first, if you don't dry it out or replace it, it will then ruin the compressor.
Master
Supportersorry, should have added - this was also replaced along with the felt pads, dryer cap and all seals on the dryer.
the dryer is one part that I'm certain is in perfect condition now.
Swaggie
The pressure required to raise to off-road height is significantly less than the reservoir pressure and uses any available pressure from the reservoir before using just the compressor. A weak/worn compressor might still raise quickly enough but can't cause the reservoir pressure to increase quickly enough.
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ForumSage
SupporterIn a similar vein, I'm having EAS problems myself and was wondering if anyone had ever current/amp/tong tested their compressor and remembers what value it ran at? This would help myself and the o.p. as too high a reading means comp seizing etc, too low means rings worn.
Also looking over my mechanics shoulder I saw a voltage setting in the diagnostics which jumped to 41 volts when comp ran but I'm thinking this might actually be amps and it is how the car diagnoses comp faults as per my aforementioned theory.
I'd particularly like to hear from Hitachi equipped owners, but Dunlop, AMK are pro'ly all similar.
ForumSage
SupporterThis is the only sort of reference to amps I can find thus far, which is from Sept 2012. When I last tried mine a few weeks ago it would start at 25A and rise to 30A as it loaded up, so this sounds about right, if mine reads 40plus tomorrow, it'll sway me to the validity of a new comp.Originally Posted by bbyer
ForumSage
SupporterIn answer to the o.p. re: times here are some I found thanks to SBD4, also from Sept 2012.
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