eas fault all lights on p38 2.5dse

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pwood999 said:
BTW, In case anyone finds it useful, I just uploaded the Land Rover "EAS - System Information Document" I found on Nano forums, to the EAS sticky section in How-To's.

Pete
Click to expand...

Peter Just searched for this in the how to section and cannot find it ? I cannot see ANY in the how to section that was updated by yourself ?

Please let me know where it is ?

Thanks
 
All additions to threads in 'how to' sections need approval.

I have no way of knowing anything has been added without wading though dozens of questions posted in wrong areas unless someone tells me.

Post and attachments approved
 
posted it as a reply to the "Checking EAS compressor" how-to.

Might be better to delete my reply and put the PDF in the main thread.

Pete
 
Nothing i can see on Nano forums. Maybe it's just in the normal documentation on the owners site. Will have a look later.
 
pwood999 said:
Today during round trip to Ferndown (185miles), I had the "random high mode" about 5-6 times. Four times I managed to press the down switch in time and avoided the fault mode, but twice I missed it, and EAS went into fault mode. Reset each time with Nanocom & continued journey.

So for the last 50 miles I thought, lets try data logging on the Nanocom and catch the fault. . . . . . no further problems . . :confused: so my wife says "just connect it when you drive !

Does Nanocom usually prevent EAS faults while connected ?

History:
Already bypassed the white connectors in left footwell:- soldered joints instead of green corrosion.
Connectors in engine bay look good. Still need to check sensor connectors.
Compressor seals & piston seal replaced 3 weeks ago:- good pressure before & excellent now.
Replaced all seals in Valve block yesterday:- no more leak from exhaust outlet.
All height sensors give similar readings on Nanocom at all height settings. . . might be glitchy, but does't look like it on Nano.
------------------------------

I now suspect driver pack strangeness but being an electronics engineer, I want to investigate rather than part-swap.

  1. So, firstly does anybody have an internal diagram for driver pack ?
  2. Are the 12V switched inputs from ECU filtered for vehicle noise ? (maybe the capacitors have dried out)
  3. Do the height sensor inputs to ECU have sensible low-pass filtering ? (I'm sure the ECU does not need to know every small bump on the road)
My thoughts are to start fitting additional capacitors to the ECU & Driver Pack inputs to remove random vehicle electrical noise. Many years ago I designed a variable wipe system form my old XJ6, and you would not believe how random the wipers were until I filtered the electronics properly.

BTW, In case anyone finds it useful, I just uploaded the Land Rover "EAS - System Information Document" I found on Nano forums, to the EAS sticky section in How-To's.

Pete
Click to expand...

With the Nanocom plugged in the EAS is in diagnostic mode and does not go into fault mode.
1) I have nearly completed a schematic of the driver pack from the circuit board, but there is a long way to go before it's fully checked.
2) The driver circuit is stupidly complicated. there is only one electrolytic and one Tantalum all other capacitors are low value beads. the solenoid drivers are MOSFETS which are I suspect the cause of failures.
3) Height sensor inputs to the ECU should need no filtering, the signal would be cleaned up digitally. Additional filtering is unlikely to help even if it masked a developing fault in the short term.
Random rises are usually down to a failing driver pack IMO.
 
blue beasty said:
All additions to threads in 'how to' sections need approval.

I have no way of knowing anything has been added without wading though dozens of questions posted in wrong areas unless someone tells me.

Post and attachments approved
Click to expand...

He has posted it as an answer to one of my EAS Stickys. Easily found if you know where to look. l can try and find the link and add it within the Sticky then you can if you need to tidy up delete the question. Up to you, leave as it is or i'll try and find and add to sticky let me know. Or give him a sticky of his own it is good info.
 
Last edited:
Datatek said:
With the Nanocom plugged in the EAS is in diagnostic mode and does not go into fault mode.
1) I have nearly completed a schematic of the driver pack from the circuit board, but there is a long way to go before it's fully checked.
2) The driver circuit is stupidly complicated. there is only one electrolytic and one Tantalum all other capacitors are low value beads. the solenoid drivers are MOSFETS which are I suspect the cause of failures.
3) Height sensor inputs to the ECU should need no filtering, the signal would be cleaned up digitally. Additional filtering is unlikely to help even if it masked a developing fault in the short term.
Random rises are usually down to a failing driver pack IMO.
Click to expand...
Er...erm....yeah, was about to say the same thing....:whoosh:
 
Datatek said:
With the Nanocom plugged in the EAS is in diagnostic mode and does not go into fault mode.
1) I have nearly completed a schematic of the driver pack from the circuit board, but there is a long way to go before it's fully checked.
2) The driver circuit is stupidly complicated. there is only one electrolytic and one Tantalum all other capacitors are low value beads. the solenoid drivers are MOSFETS which are I suspect the cause of failures.
3) Height sensor inputs to the ECU should need no filtering, the signal would be cleaned up digitally. Additional filtering is unlikely to help even if it masked a developing fault in the short term.
Random rises are usually down to a failing driver pack IMO.
Click to expand...

I think on that link I put up the guy spent ages looking at the electronics and in the end it was a dodgy wire. Some of the wires inside the EAS box are rather thin and probably a little brittle as it does get hot in there. In fact, I seem to remember some people cutting cooling holes and putting CPU fans in the side although I'm guessing that's just extending the life of a failing driver pack rather than a permanent fix.
 
Grrrrrr said:
I think on that link I put up the guy spent ages looking at the electronics and in the end it was a dodgy wire. Some of the wires inside the EAS box are rather thin and probably a little brittle as it does get hot in there. In fact, I seem to remember some people cutting cooling holes and putting CPU fans in the side although I'm guessing that's just extending the life of a failing driver pack rather than a permanent fix.
Click to expand...

And one even put Blue plastic eyelets around the holes, didn't you Rachel.:hysterically_laughi
 
Some more EAS data for anyone that likes Excel. . . .(see attached). . .. and does seem to point toward dodgy Driver Pack.

Today on way home from work I connected Nanocom again, and started logging. About 12-14 mins into the journey the height switch started flashing high-mode again . . . so the random changes do occur with EAS in diagnostic mode :)

Reset the EAS while driving at 65mpg (yes I know - naughty) and the EAS returned to normal.

So looking through the log file, I found something interesting. (approx. lines 440-680)
  • Rear Right sensor showing 10% above target height.
  • RR valve & Exhaust valves open . . .BUT height not dropping.
  • Definitely sounds like Driver Pack failing to actually open one or both of the valves. . . .

Assuming one second per data set logged by Nanocom, this is about 12 minutes after I started logging, which is quite close to when it happened.

Another question: I'm wondering why the values for the Rear Left height sensor are significantly smoother that the other three ?

Pete
 

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