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the Rover just got back from a 600 mile round trip and drove great.

prior to the trip i had noticed that the EAS would randomly let all the air out of the tank. it would reach about 80 psi and then exhaust all the air.

didn't worry about it too much as it was incredibly cold at the time and i couldn't work on it anyway. also, kinda hoped it was just being finicky due to the sub zero temps.

today taking the dog to the vet and went into EAS Fault but did not go to bumpstops. in fact, the front end raised and the rear dropped.

drove home no problem but while idling and sitting in the drive it dropped all the way down.

see the codes pulled below,
FR signal incorrect
RL signal incorrect
RR signal incorrect
Vehicle speed fault
Air supply leak
Target Heights incorrect
Vehicle has moved
FA:16_Hidden
FL valve stuck open
Exhaust valve stuck open
FB:64-Hidden
FB:128_Hidden
FL valve stuck closed
FR valve stuck closed
RL valve stuck closed
RR valve stuck closed
Exhaust valve stuck closed

i rebuilt the valve block about six or so months ago with all new o-rings.

does this sound like a bad pressure switch, pressure valve or exhaust solenoid?
i have a spare valve block that i have not rebuilt yet but can pull parts off that as needed.

thanks,

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Those look like spurious faults from no comms.

Have you got the "good idle" on the RSW software??

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+1 on spurious garbage due to no comms.

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you know?

i think you are both correct.

i'll reset the comms port and retest.

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If it won't connect, drop the baud rate to 4,800. Had to do that when trying to use the RSW software on a Classic although works fine at 9,600 on mine.

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Gentlemen,

i was finally able to get the software to connect properly and initialize.

i was able to read the following codes,

Air supply leak
Vehicle has moved
FL valve stuck closed

i was able to reset the EAS Fault and restarted the truck so the tank could recharge.

the pump is running. it will build pressure but then drop it all. i cannot find a leak in the lines anywhere but i'm leaning away from that anyway as the a leak in the lines would probably not allow any pressure to build.

Edit: hit send too early.

after Clearing the EAS Faults i restarted the truck and opened the driver's door. the pump filled the tank up within 5 minutes. i closed the door and the truck raised up to ride height and acted as if nothing was wrong.

when i turned the Rover off, however, i could hear air being released and the pressure gauge dropped from 140 psi to 0. the sound came from under the valve block it self.

i double checked all the airlines as i listened to the air discharge and confirmed no leaks from them. i also checked the Exhaust Silencer and there was no air coming from that, either.

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Could the air be leaking from the pump or airline from pump --- only a thought Also I've had leaks from the connector ( on coach doors) but same principle

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i checked that and no leaks.

the air only leaked out this last time after i shut the engine off and the system went inactive.

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On the underside of the valve block, you've got two solenoids (Front Left and Rear Right) but there's also the Pressure Relief Valve and Pressure Switch. Highly unlikely a solenoid would suddenly start leaking that much air out so it could be either of the others.

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Gilbertd wrote:

On the underside of the valve block, you've got two solenoids (Front Left and Rear Right) but there's also the Pressure Relief Valve and Pressure Switch. Highly unlikely a solenoid would suddenly start leaking that much air out so it could be either of the others.

what would cause the Pressure Relief Valve to discharge all the air.

i'll take a look at the schematics and diagrams this evening or tomorrow morning to see if i can figure out what triggers the PRV. but i don't want to change out the PRV if there is something else that is telling it to discharge.

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Looking at a spare valve block I have here, it appears the PRV is just that, a passive device. No electronics attached to it, just a brass valve.

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i did some more testing this morning.

i popped the hood and checked the air pressure. it was sitting at 15 psi.

i started the Rover and left the driver's door open. the pump immediately started to refill the air tank. using a spray bottle with soapy water i sprayed every joint and every place the air lines go into the valve block. i also sprayed the exhaust silencer.

them pump runs strong and filled the tank to 110 psi in a minute or two. during this time i saw no air leaks from any of the lines or other usual supspects.

at 120 psi i turned the Rover off. right away i could hear air being vented. sure enough the exhaust silencer was bubbling like mad.

so, the system is venting all the air from the tank whenever i turn the truck off but is holding pressure while the truck is running.

does this mean my Diaphragm Valve is failing? if so, would it most likely be the disc?

i did rebuild this several months back but that doesn't mean i did it correctly.

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I've seen 3 different types of diaphragms from different rebuild kits, so it's quite possible you've got an iffy one. More likely that than anything you did, if that was the case I'd expect it to not work from day 1.

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i just ordered another rebuild kit from X8R. i had to order from the UK as they seem to be out of stock on this side of the ocean.

once that arrives, i rebuild the spare valve block and install that so i can check out the valve block currently in the Rover.

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rebuilt my spare Valve block two weeks ago and dropped it in the Range Rover.

everything is working as it should.

eventually i'll tear down the faulty Valve block to see what i did wrong with that one. most likely a crimped O-ring.