warley1
Member Since: 28 Jun 2013
Location: Dunsborough
Posts: 8
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| Air Suspension Problems The Works! Western Australia. |
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Hello all, you may be my last hope!! I have a small workshop in country western Australia and I specialise in landy repairs. The nearest official Landrover dealer is 2 1/2 hours north in Perth.
I've been operating for 3 years and this may be the first vehicle I am contemplating giving up and putting it on a truck and sending to the big smoke, anyway, here's the story:
Vehicle D3 SALLAAA137A417405
Customer buys the car and brings it in for its first major service. I have a Hawkeye so I "deflated all" so I could raise the vehicle safely on a 2 post hoist. All goes well (as it has done on a heap of other vehicles) until I try to start the motor to recheck the oil level.
The battery had run flat so lots of solenoid clicking. I put the battery pack on and all dash lights flash on and off. Put the car on charge (all with the battery connected) and start the car.
Now the car won't rise and the orange lower dash light stays on and the dash displays special features disabled. Left hand rise/lower switch led lights not illuminating and the rotary button l.e.d.s not working.
Hawkeye showed the following fault codes:C1A380. BOTH SWITCHES PRESSED AT SAME TIME. SIGNAL PLAUSABILITY FAILURE.
Its here where the list of work begins with no result to date:
Fully charged the battery even fitted a new one.
Replaced the compressor
Replaced the main fuses
Checked all other fuses
checked the plug into the transfer case ecu behind the battery, the large one was lightly corroded, cleaned and put back on.
Pulled all the plugs in that area, blew out with air and reconnected
Found a pool of water in the well beneath the ecu's, mopped up, separated all plugs and left a hair dryer on for several hours to thoroughly dry the area.
Disconnected and cleaned all height sensors. Hawkeye recognised all sensors were disconnected.
Disconnected the terrain control module in the cabin, hawkeye recognised this was disconnected AND I still had the error above.
Disconnected the front solenoid module, rear solenoid module and the solenoid net to the compressor. Hawkeye noticed all were disconnected and same error still there.
I'm now into my fourth day (at my expense) and I have bought a compressor that I cant return (I cant ask the customer to buy if his is working).
Today I gave in a bought a new Trans case ECU, I plugged it in and I still have the same fault AND another problem appeared, the low gear mountain dashboard light is flashing.
I have had a sparky check my work and he tells me there is no signal to the compressor relay, by shorting the relay the compressor works well.
So! Not sure what's next. Do I keep shot-gunning the car with more parts? Airs suspension ECU? Terrain response cab module?
Any help you can offer would be gratefully received before I go broke or go for premature retirement.
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 4th Jul 2013 11:35 am |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
  
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Have you forced the compressor to run for a couple of minutes by shorting out the relay. It should then at least fill the reservoir and allow the car to start to raise.
Often if the reservoir has been emptied, the car wont lift as the pressure in the reservoir is too low.
I'd run the compressor for a few minutes and then put the relay back in and see what happens. You may need to let the compressor cool down for 1/2 hour before running it again (shorted if necessary for a few minutes again) Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
See It Here
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| 4th Jul 2013 11:39 am |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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btw, the worst that will happen if you lift the car without deflating, is it will go into extended mode. it may try to self level, but shouldnt do any damage. if concerned about it and you need to do suspension work (other than anything to do with the air pipework or compressor) then you could just remove the fuse if that concerned. 
your lifting on the chassis, so its not going to go anywhere. Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
See It Here
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| 4th Jul 2013 11:43 am |
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DiscoDunc
Member Since: 08 May 2006
Location: Bristol
Posts: 16390
  
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have you reset all the codes ? does it still give the messages Duncan
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| 4th Jul 2013 12:01 pm |
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Bodsy
Site Sponsor
Member Since: 06 Nov 2006
Location: In the Clubhouse
Posts: 21361
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C1a38 is rear crosslink valve. Doesnt seem to be a C1a380 Bodsys Brake Bible
D4/D3 Remote FBH heat kits
BAS Remaps/ EGR Blank
Transmission Flush
Software updates/enabling
Clock/ SNOTM /3Flash / 4x4Info /BT Update /Service Reset/Error Codes / Gearbox Reset
See It Here
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| 4th Jul 2013 12:21 pm |
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garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1130
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Are you a member of www.aulro.com ?? If not I would joining and asking there. Lots of Landie mechanics and many forumites are from dealers and give good information.
After doing all that work have you done a hard reset to reset all the computers??? and then started and switched off and back on 3 times ??
Garry
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| 4th Jul 2013 12:37 pm |
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warley1
Member Since: 28 Jun 2013
Location: Dunsborough
Posts: 8
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Thanks for the quick responses. Cleared the DTC hundreds of times! Same "conflicting signals" error keeps coming up. I was a bit nervous about running the compressor for too long but I'll try that tomorrow. I've got the uprated relay in but the current draw on the old compressor was 80 amps and without a tank pressure gauge I felt like I was running blind ...but I'll give it a go.
If the compressor can build sufficient pressure, will it inflate the bags without any valve block activation? I.e. if no signals are sent from the control unit will the bags still inflate by shorting the relay?
Thanks to you guys and this site, I've also found a great LR training manual on D3 air suspension that states the internal up / down switch only supplies an earth to the suspension ecu depending on what's required, so! I'll look for an ecu pin guide that will help me isolate the inputs from the switch to the ecu (at the ecu). If I can isolate those inputs and I can get rid of this "conflicting signal" fault codes I may have a short somewhere??? And / or an internal air sus ecu fault??
Re hard reset: I hesitate to ask this (cos I have a feeling I should know it) but how do you do a hard reset on a D3? If I clear all of the codes via Hawkeye is this the same as a hard reset
Re AULRO, I joined last week, great site and really useful but I thought for this problem a D3 specific site would be a good start. This is my first venture into posting, I've been a taker of knowledge for a long time but I feel the need to give something back to the LR community that have helped me out so many times before.
Thanks again to all for the benefit of your hard won experience, I couldn't get by without it.
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| 4th Jul 2013 2:09 pm |
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warley1
Member Since: 28 Jun 2013
Location: Dunsborough
Posts: 8
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Bodsy, thanks for the tip re 2 post hoist lifting, there's an old wives tale running around our town that if you lift an air bagged landy on a two poster the sky will fall in (a couple of popped air bag stories from old timers), so good to get some proper advice.
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| 4th Jul 2013 2:20 pm |
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garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1130
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warley1 wrote:Re hard reset: I hesitate to ask this (cos I have a feeling I should know it) but how do you do a hard reset on a D3? If I clear all of the codes via Hawkeye is this the same as a hard reset
Re AULRO, I joined last week, great site and really useful but I thought for this problem a D3 specific site would be a good start. This is my first venture into posting, I've been a taker of knowledge for a long time but I feel the need to give something back to the LR community that have helped me out so many times before.
Hard reset is with ignition off and handbrake on, wait until the handbrake light goes out and then disconnect the battery leads and then touch the battery leads together - this reboots the computers when power is reapplied when you reconnect the battery. Faults that really exist rather than what the computers think exist will reappear but anything else will be gone - this may (or may not) clear things you have actually fixed leaving the real issues. I have also found when I had EGR issues that it can take three resets of the ignition to clear some fault indications even when the fault has been fixed.
Re AULRO on there you have "Graeme" who invented the LLAMS suspension system for D3s. There would be no one in the D3/4 world who knows more about the suspension system electronics. You also have "gghaggis" from WA who designs and builds suspension mods like a system to inflate the airbags via an external compressor. If you post in the D3/D4 section of AULRO I am sure both will be along to help.
I don't envy you being now being a D3 mechanic but good luck with it.
Cheers
Garry
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| 4th Jul 2013 2:58 pm |
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GraemeS
Member Since: 17 Mar 2008
Location: NSW
Posts: 706
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| Re: Air Suspension Problems The Works! Western Australia. |
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warley1 wrote:Hawkeye showed the following fault codes:C1A380. BOTH SWITCHES PRESSED AT SAME TIME. SIGNAL PLAUSABILITY FAILURE.
Unplug the switch to test for a faulty switch (most likely) but if that doesn't work, I'd suspect pinched wires somewhere between the switch and the suspenison ecu connectors (raise and lower are on different connectors) which is located high on the driver's A-pillar. I assume you have pressed the raise switch with the engine running which is often required to clear a plausibility error. Home of LLAMS, for LRs and Jeep GCs
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| 4th Jul 2013 9:05 pm |
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GraemeS
Member Since: 17 Mar 2008
Location: NSW
Posts: 706
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warley1 wrote:If the compressor can build sufficient pressure, will it inflate the bags without any valve block activation? I.e. if no signals are sent from the control unit will the bags still inflate by shorting the relay?
Absolutely not. Home of LLAMS, for LRs and Jeep GCs
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| 4th Jul 2013 9:17 pm |
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GraemeS
Member Since: 17 Mar 2008
Location: NSW
Posts: 706
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Bodsy wrote:C1a38 is rear crosslink valve. Doesnt seem to be a C1a380
Conflicting info can lead to wild goose chases but in this case a faulty switch would cause such suspension control unit inactivity. I doubt that even a short circuit in a valve circuit would stop all functions but perhaps it would. An open circuit in a crosslink valve triggers normal height only - an inconvenience, not a show stopper. Home of LLAMS, for LRs and Jeep GCs
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| 4th Jul 2013 9:41 pm |
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warley1
Member Since: 28 Jun 2013
Location: Dunsborough
Posts: 8
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Thanks all for the info, its 7.20am here and I'm steeling myself for another D3 adventure (it might be a bit perverse but I'm actually enjoying the hunt, if it doesn't kill me it will hopefully make me stronger!). Cheers Garry for the aulro info. I'll post tonight. Oh well, here goes..........................................................
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| 4th Jul 2013 11:21 pm |
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garrycol
Member Since: 06 Dec 2010
Location: Canberra
Posts: 1130
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warley1 wrote:Cheers Garry for the aulro info. I'll post tonight. Oh well, here goes..........................................................
Well Graeme  has found you here and already provided great advice
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| 5th Jul 2013 12:26 am |
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GraemeS
Member Since: 17 Mar 2008
Location: NSW
Posts: 706
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Thanks for your vote of support Garry. I don't often get here but hopefully my chance look can help Warley. Home of LLAMS, for LRs and Jeep GCs
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| 5th Jul 2013 1:51 am |
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