cedwat
Member Since: 16 Nov 2007
Location: North
Posts: 179
  
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Hi,
Nearly everyday, I get a "suspension default" when driving. The car will then lower and get very stiff. Then the default will desapear and the car go back to normal height. Of course, a way to avoid this is to turn off the engine and back on even without stopping the car.
I have checked the dtc codes with my BAS interface and I get this :
P2199
P0402
P0401
Â
U0138
U0121
U0101
U0151
U0416
Would you have any ideas about what is going on with the car?
Thanks. My fifth Disco ...
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 28th Apr 2011 6:46 pm |
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cedwat
Member Since: 16 Nov 2007
Location: North
Posts: 179
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I have tried to erase the DTC codes, but I still had two "suspension default" incident on my way to work (5 km !). My fifth Disco ...
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| 29th Apr 2011 8:14 am |
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PaulP
Member Since: 04 May 2007
Location: Barcelona
Posts: 4317
  
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The first ones are EGR faults.
The rest of the network errors (the "U" codes) I'd need to look up, but there's quite a few of them which, if all related to the suspension, may suggest broken wires or something like that.
It's a shame you don't have the final byte of the fault code which could give more info... 2006 Discovery 3 TDV6 SE Auto Buckingham Blue
2007 Golf GT DSG
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| 29th Apr 2011 2:28 pm |
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JF Lux
Member Since: 08 Sep 2007
Location: A little country in Europe
Posts: 3522
 
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sure P2199 is EGR related? I've always noted it as "Intake Air Temperature 1/2 Correlation" and is possibly something to do with air-flow sensor ? The next American ex-pat that calls it a "truck" is going to find out what 2.7 tons feels like on their foot...
Club "yes, I too have had the EGR's replaced..."
Club "yes, I too have had the compressor replaced..."
Club "yes, I too once had the car at the dealer for a couple of weeks nearly 4 weeks over 4 weeks...5 weeks"
Club "yes, I too have had EPB failure..."
Club "yes, I too get mysterious bings and bongs..."
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| 29th Apr 2011 2:48 pm |
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GraemeS
Member Since: 17 Mar 2008
Location: NSW
Posts: 706
 
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PaulP wrote:The first ones are EGR faults.
The rest of the network errors (the "U" codes) I'd need to look up, but there's quite a few of them which, if all related to the suspension, may suggest broken wires or something like that.
It's a shame you don't have the final byte of the fault code which could give more info...
Maybe even something simple like the rear harness plug not properly fitted to the suspension ecu. That plug has the canbus and the 2 rear height sensors (apart from anything else). Loosing 2 height sensors will cause a drop to the bumpstops and loosing the canbus would cause network errors. Home of LLAMS, for LRs and Jeep GCs
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| 29th Apr 2011 3:22 pm |
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cedwat
Member Since: 16 Nov 2007
Location: North
Posts: 179
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First, thanks for your help.
I now realize I may have done something that has damaged a wire or a sensor: I wanted to see if the vehicle would seat on it's 32" wheels if I empty all air from the system. I did it. I released all air from the system and the vehicle sat on it's wheels. Then I put air back in it.
This may have damaged a wire or sensor.
Where should I look to check that ? My fifth Disco ...
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| 29th Apr 2011 4:39 pm |
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GraemeS
Member Since: 17 Mar 2008
Location: NSW
Posts: 706
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Did you disconnect any electrical connector in the process of emptying the air? The only vulnerable sensor wire is behind the front left wheel because a cable pulls away from its clip holding it to the chassis, although that wouldn't normally cause your type of fault. Home of LLAMS, for LRs and Jeep GCs
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| 29th Apr 2011 10:15 pm |
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cedwat
Member Since: 16 Nov 2007
Location: North
Posts: 179
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I didn't. I used my Faskit system to empty the system.
Where is the suspension ecu ? My fifth Disco ...
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| 29th Apr 2011 10:17 pm |
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GraemeS
Member Since: 17 Mar 2008
Location: NSW
Posts: 706
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Its high up on the driver's A-pillar and has 4 plugs connected across the bottom. The forward-most one if RHD and rear-most one if LHD has the canbus wires and the rear sensor wires but you would ensure all 4 are properly home once there. Home of LLAMS, for LRs and Jeep GCs
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| 30th Apr 2011 1:28 pm |
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cedwat
Member Since: 16 Nov 2007
Location: North
Posts: 179
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In France we are lhd, so would that be near the passager A-pillar? My fifth Disco ...
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| 30th Apr 2011 1:36 pm |
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cedwat
Member Since: 16 Nov 2007
Location: North
Posts: 179
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I have anothere strange symptom: sometimes, when I want to go in parking position (lowest). The car will start to lower but then go into super extended mode. Don't know if there is a relation.  My fifth Disco ...
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| 30th Apr 2011 2:02 pm |
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Adigorn
Member Since: 14 Mar 2010
Location: Birmingham
Posts: 546
 
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check compressor harnes for blockage
looks like pressure release might be affected
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| 30th Apr 2011 5:12 pm |
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cedwat
Member Since: 16 Nov 2007
Location: North
Posts: 179
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Will do. Where should I look exactly please? My fifth Disco ...
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| 30th Apr 2011 6:52 pm |
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Adigorn
Member Since: 14 Mar 2010
Location: Birmingham
Posts: 546
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when you remove compressor cover
there are two pipes at the back of the compressor
try to disconnect them and oprate the suspension and check if you can drop suspension down
dont be afraid if can hear a loud whistle when suspension is moving (silencer will be disconnected)
if suspension operates normaly check pipes for blockage etc
remember that the pipes you are interested are at the back of the compressor (rear left wheel area)
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| 30th Apr 2011 7:03 pm |
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