Classic EAS all solenoid valves "stuck" - what to check first?

DaimlerV8 said:

Hello everyone, please may you advise me on where to start my investigation.

I have purchased a 1995 RR Classic (petrol/auto) that has been stored in a barn for five years and I am new to Range Rovers. The previous owner tells me the compressor and airbags were replaced shortly before storage and I believe him. Other than sitting on its bump stops with a EAS hard fault the vehicle is in good condition and runs well.

Storey Wilson's EAS software returns the following faults:

1: Cannot lower FR ................... 2: Cannot lower RL ........................ 3: Cannot lower RR
6: FA:64_Hidden ....................... 0: FL valve stuck open .................... 2: RL valve stuck open
4: Inlet valve stuck open ......... 5: Exhaust valve stuck open .......... 6: FB:64_hidden
7: FB:128_hidden ..................... 1: FR valve stuck closed ................. 3: RR valve stuck closed
​

So if my understanding is correct, the software is saying all the solenoid operated valves in the valve block are "stuck". In another forum post wammers says:

"Valves do not stick. It is a fault thrown up when something ECU has commanded did not happen in a time period. Most likely cause is lack of air pressure or a out of sorts corner sensor."​

I wonder whether the fact all the valves are stuck might also be caused by a wiring, relay or controller fault...?

Any help and advice so I may investigate potential causes in the most efficient order is much appreciated.

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wammers said:

Sounds like bad comms with diag.

Click to expand...

DaimlerV8 said:

Thanks guys - I have been thinking about what all three of you have said and thank you for highlighting the coms. My compressor was running when those faults were read which, I believe, according to the control logic would not happen if the exhaust valve was open... so erroneous coms and this is the first thing I will aim to address.

I used the no-longer-available RSW EAS Unlock Suite freeware on a Windows 2000 laptop via a USB port with serial adaptor and I was able to reset the hard fault using it. The weakest link is the USB-serial adaptor as the drivers disk was broken in the post and I had to fall back on downloaded generic drivers. So first action: I am hitting up friends and family to search their lofts for an old serial-port equipped PC and will try again in a few days' time.

Wazzajnr's comment reminded me that the compressor was running for probably 10-20 minutes when I did those fault readings and it did not self cut-off (as I believe it would if the reservoir reached full charge) and the vehicle remained on the bump stops. There were no audible air leaks so depending upon what the next set of fault codes indicate I guess the compressor and checking for air leaks with soapy water might be next on the to-look-at list.

Click to expand...

DaimlerV8 said:

Thanks guys - I have been thinking about what all three of you have said and thank you for highlighting the coms. My compressor was running when those faults were read which, I believe, according to the control logic would not happen if the exhaust valve was open... so erroneous coms and this is the first thing I will aim to address.

I used the no-longer-available RSW EAS Unlock Suite freeware on a Windows 2000 laptop via a USB port with serial adaptor and I was able to reset the hard fault using it. The weakest link is the USB-serial adaptor as the drivers disk was broken in the post and I had to fall back on downloaded generic drivers. So first action: I am hitting up friends and family to search their lofts for an old serial-port equipped PC and will try again in a few days' time.

Wazzajnr's comment reminded me that the compressor was running for probably 10-20 minutes when I did those fault readings and it did not self cut-off (as I believe it would if the reservoir reached full charge) and the vehicle remained on the bump stops. There were no audible air leaks so depending upon what the next set of fault codes indicate I guess the compressor and checking for air leaks with soapy water might be next on the to-look-at list.

Click to expand...