Member Since: 03 Mar 2018
Location: Deepest darkest Cambridgeshire
Posts: 11
Rear wiring loom to rear air valve block - chaffing
Quick question as I can't find anything searching.
Has anyone had experience of broken wires or chaffing through insulation for the wiring harness that goes to the rear air valve block?
Car is a late 2004 Discovery 3 HSE TDV6.
I have an intermittent suspension problem, when I hit the raise/lower switch, and occasionally when driving, which gives the 'standard suspension height only' message. Diag says it is right rear corner air valve. The code clears on ignition turn off/on, and on standard suspension settings, the car is level and does not loose height.
Previous owner has had the valve block replaced in the last 2 months, as well as a new compressor and drier (this was to try and solve the problem apparently). I have not yet checked the installation and if any pipe leaks, but am suspecting it might be a wiring issue not activating the right rear corner valve when requested.
Any likely locations where the harness chafes would be very useful to narrow down the search thanks.
22nd Mar 2018 10:02 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10336
I think there is a connector near the rear passenger side wheel arch
22nd Mar 2018 12:10 pm
The_Wombat
Member Since: 03 Mar 2018
Location: Deepest darkest Cambridgeshire
Posts: 11
Thanks Pete
Yes, the air valve block is attached to the suspension turret in the passenger side rear wheel arch. There is a harness plug that goes into it.
The wiring diagram shows a direct connection to the suspension ECU so it should be easy to test continuity of each wire.
Just wondering if there are any known rubbing points where people have had similar problems.
22nd Mar 2018 3:57 pm
G_Cam
Member Since: 12 Aug 2010
Location: Fife
Posts: 2048
yip.. mine had snapped on Mrs G_Cams last D3... Close to the connector block1 TR6 Rusting away quietly
1 FARR UTV SOLD
1 International Harvester SOLD
7 x D3 all SOLD
2 x D4 both SOLD
1 x Mrs D4 'Panther' SOLD
1 x Outlander van SOLD
1 continual stream of car parts and me living in the garage...
22nd Mar 2018 4:35 pm
The_Wombat
Member Since: 03 Mar 2018
Location: Deepest darkest Cambridgeshire
Posts: 11
Thanks for that.
Oil and filter service, and going under to try and find and sort this tomorrow!!!
23rd Mar 2018 11:58 am
G_Cam
Member Since: 12 Aug 2010
Location: Fife
Posts: 2048
I had a leaking valve block .. Where the plug goes in.. It was leaking through the pins...
You can see the yellow tape marking where the wires were broken. I srtipped and soldered in some new wiring to the plug...
Hope this helps a little..
Click image to enlarge
1 TR6 Rusting away quietly
1 FARR UTV SOLD
1 International Harvester SOLD
7 x D3 all SOLD
2 x D4 both SOLD
1 x Mrs D4 'Panther' SOLD
1 x Outlander van SOLD
1 continual stream of car parts and me living in the garage...
23rd Mar 2018 12:19 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10336
Member Since: 03 Mar 2018
Location: Deepest darkest Cambridgeshire
Posts: 11
That link was useful. I’ve been under the car today and it is clear that whoever looked at the problem before made a pigs ear of it. Those big connector blocks are just hanging down and exposed, the loom has been pulled down and is just hanging, and loads of insulation tape used to try and patch it all up. I haven’t solved the issue and having depressurised the system, it won’t go back up. I’m going to order a new valve block then have a go at checking and resetting all of the loom plugs.
I have a receipt from a garage foranew valve block but the one on there looks very old, not from Feb 2018!!!!
Can anyone confirm the valve block air connections? I believe they are OS strut into the bottom centre, green supply line into the lower of the two end holes, and NS strut to the upper of the two.2000 Discovery 2 TD5
2004 Discovery 3 TDV6
1992 Alfa 75 V6 Cloverleaf
1992 Alfa 155 Q4
2001 Alfa GTV 24v
2003 Alfa 156 GTA SW
1997 Fiat Coupe 20VT
24th Mar 2018 4:46 pm
The_Wombat
Member Since: 03 Mar 2018
Location: Deepest darkest Cambridgeshire
Posts: 11
Pulled the loom apart and checked it today. There is nothing obvious, and no apparent corrosion, broken wired, chafing or similar issues, so routed them to ensure no rubbing, got some harness protection around them, and put them all back up.
I still have the rear right valve problem though. Clear the fault with my RSW software, or the ignition clears it, and it either re-appears randomly once in a while, or always if the height selector switch is operated (suspension fault, standard height only available). Any fault code generated is rear right valve, although when this happens, special programs also turn off with the 'suspension fault special programs...' message.
I am assuming, having had the valve block apart, that the valves are solenoid operated, in which case I would expect to see continuity across each pair of plug pins. I don't have this, so subject to comment and further investigation, I believe the valve block is fubar. One on order for next weekend, and in the meantime the car is usable and all is good.
While playing and doing this work, the compressor seems to work as required. Lifted the car to target levels and nothing after that. Car is stable and has not sunk during the day, and all seems good.2000 Discovery 2 TD5
2004 Discovery 3 TDV6
1992 Alfa 75 V6 Cloverleaf
1992 Alfa 155 Q4
2001 Alfa GTV 24v
2003 Alfa 156 GTA SW
1997 Fiat Coupe 20VT
25th Mar 2018 8:51 pm
zoneout
Member Since: 28 Oct 2015
Location: Cape Town
Posts: 39
Any resolution on this one? I have a similar problem (but with the front)
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