Member Since: 19 Jun 2023
Location: North Lincs
Posts: 5
Suspension Puzzle!
Hi folks, need some guidance from all those who have been through the Air Suspension nightmares.
I have a D4 2014 SE that developed the much discussed ' Normal Height Only" fault always shortly after starting.
So; fitted new seal kit on the compressor
New seal kits to valve blocks ( all looked in good nick)
Reservoir looks decent very little rust
No leaks found anywhere that I could get to.
After this work I started getting reservoir filling too slow faults along with the Normal ones.
That led me to think the compressor was Kaput!
So changed it out, albeit with an aftermarket one ( 2 year warranty).
Works just fine, car moved through all levels ok, but one thing I did notice when calibrating was the rear right sensor had output voltage of around 1.6V and the height during calibration would not budge on the GAP tool.
This was bugging me even though everything seemed ok.
So bought replacement height sensor for that corner again aftermarket ( yes I know), a 20 minute job turned in to an absolute nightmare as the usual screws would not let go of the brass sleeves, ending with me cutting them off.
Anyway new sensor fitted all ok till this morning, then suspension fault-height sensor, so wheel off again to check connections, looked good, all wiring to the plug looked good, rear left electrical plugs also looked good.
Recalibrated again, same as before rear right corner was at the correct height but still couldn't get it to adjust up or down with GAP tool.
Now though the compressor seems to be in use way too much, I can drop the car to Access height ok but when I select Normal it moves up ok pauses slightly then carries on straight to Off-Road height, same in reverse straight down to Access height, I then have to drive off to get Normal height back.
Very strange because I get no fault codes, I checked again twice for leaks ( apart from front valve block)
and nothing showing up.
So what's going on? Cheap sensor? ECU issue? break in wiring? I'm stumped, but I was expecting the GAP tool to tell me something.
Anyone had anything similar?
Any input would be greatly received.
Have added shots of the Live values for each sensor as it changes levels.
Cheers lash
Click image to enlarge
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Land Rover 90 1989
Land Rover Discovery 4 SE 2015
26th Aug 2024 3:34 pm
Bicycle repairman
Member Since: 18 Sep 2019
Location: Cumbria
Posts: 188
Had this on a few D3s
I'd check the wiring give the wires to the sensor a good tug they may look ok from the outside but they do have a tendency to corroded from the inside copper goes black and gives a poor intermittent connection.D4 GS let the retro fit begin
Heated steering wheel
Aftermarket TPMS
Double Din head unit satnav and TV
Reverse Camera
Cubby fridge
Door panel upgrade
Mood lighting
Digital Dash personalised
Back lit sun visors
4.5 Facelift front, rear and memory mirrors
Stainless bumper tread plate
6 pot Brembo conversion
HSE heated memory seats
Retro fit auto lights and wipers
LR 663 Defender alloys
275 45 20 GG AT3s
quarter of a D3
27th Aug 2024 8:32 pm
Lash
Member Since: 19 Jun 2023
Location: North Lincs
Posts: 5
Thanks for the info Repairman, will check that out on Friday when time permits, not got a lot of knowledge of auto electrics, but have been looking up how to check the sensor out with a multi meter, always something to learn owning a Land RoverLand Rover 90 1989
Land Rover Discovery 4 SE 2015
28th Aug 2024 6:03 pm
Lash
Member Since: 19 Jun 2023
Location: North Lincs
Posts: 5
Update, I've had the GAP tool live values graph running while I manually moved the rear right height sensor through it's range of motion and everything looks good, voltage rises and lowers as such, pulling on the connector wires and plug also showed no anomalies.
To make matters worse I now have a new amber fault on the dash- U3000-1D (AF) pic below, it appears within seconds of start-up so there's no chance to cycle through any suspension levels, I can't seem to find this code on the fault list on the LR workshop manual.
Anyone had this fault in the past?
I've had a look at the control module, pulled the plugs off and checked the pins, they all look good no corrosion.
Is there a way of testing the suspension module via a multi-meter
Everything was working fine before I swapped out that rear sensor, wish I'd never bothered, could that act have such impact on the control module?
Any insights would be most appreciated.
Lash
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