Member Since: 18 Sep 2021
Location: Norway
Posts: 6
C1A75 Rear right sensor mechanism
I have a problem with the rear right height sensor.
I had a new sensor installed and calibrated in the workshop after the old one gave exactly the same error message that I now get on the new one. When I read data on my iCarsoft, the sensor itself works correctly, and the suspension itself works as it should, but there are still warning lights in the instrument panel and the image on gps devices shows that there is a fault on the rear right sensor. I have resistance measurements between the plug of the sensor and the plug of the control box, the wires are ok. I have even tried with another control box and exactly the same error message comes ...
Has anyone experienced the same problem and can help me?
18th Sep 2021 2:40 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4628
Hi and welcome.
There should be extra digits at the end of that fault code which helps pin point it.
However, have you fitted the correct height sensor? ie A right hand rear sensor and not a left handed one?? They are not interchangeable!!
If you fill out your user profile completely (model, year, auto/man, etc) it would also make it easier for us to offer any help
Beyond that it's speculative without the remainder of the fault code, but in any case it should be an easy enough fix. yµ (idµ - eAµ) ψ=mψ
18th Sep 2021 4:03 pm
per.jone.bakker
Member Since: 18 Sep 2021
Location: Norway
Posts: 6
Thanks for the answer, but it has already been tried with two different sensors that are mounted at LR workshop, but of course I can check again if the sensor is mounted correctly? The suspension system works properly, and I get the right values on my diagnostic tool. The workshop has also tried to find out the problem without success. The workshop believes that the fault is due to a cable break, but it is not.
I also do not think there is anything wrong with the connector on the season as I have actually changed this twice. The contact on the control unit is also measured and should work.
Unfortunately, I have such a simple diagnostic tool that it does not show any more specific error code, but as I said, the workshop has also tried to analyze the problem.
The car is a Disco 3, 2008 model, diesel
18th Sep 2021 4:27 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4628
It sounds like a mechanical issue with the fitment, ie the sensor arms / fitment to the chassis. Other possibilities for "mechanical" sensor issues include bad calibration, damaged suspension arm.
It can just as easily be an electrical issue which is why the remainder if the fault code is helpful.
What is, (1) the sensor supply voltage, and (2) the sensor signal voltage provided in your iCarsoft data stream?yµ (idµ - eAµ) ψ=mψ
18th Sep 2021 4:40 pm
per.jone.bakker
Member Since: 18 Sep 2021
Location: Norway
Posts: 6
I'll be checking for mechanical faults, my local authorized land rover workshop has made many faults with the car in the past, so ...
The diagnostic tool shows a voltage of 4.93 volts. To the other sensors that actually work, it shows 4.92 volts.
Does anyone have a picture of the correctly mounted sensor right behind? So that I can check if the work is done correctly?
Or maybe I can take a pitchure tomorrow and you maybe can confirm if the work is correctly done?
18th Sep 2021 4:58 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4628
Supply 4.92v, what is the signal (return) voltage?yµ (idµ - eAµ) ψ=mψ
18th Sep 2021 5:08 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4628
The live values below are typical of what you would see in a correctly operating system. If this is what you are seeing then it's likely you have a mechanical issue.
yµ (idµ - eAµ) ψ=mψ
18th Sep 2021 6:51 pm
per.jone.bakker
Member Since: 18 Sep 2021
Location: Norway
Posts: 6
Maybe a failure?
Voltage supply between 4,92 - 4,93 volt on the sensors.
Return voltage:
Front left height sensor - 2,9v
Front right height sensor - 2,88v
Rear left height sensor - 2,25v
Rear right height sensor - 4,68v (problem sensor).
Does this give any meaning?
19th Sep 2021 10:42 am
per.jone.bakker
Member Since: 18 Sep 2021
Location: Norway
Posts: 6
19th Sep 2021 11:22 am
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
That sensor does not look new, but the plug and maybe the loom is? so have they wired it up correctly?
19th Sep 2021 11:27 am
per.jone.bakker
Member Since: 18 Sep 2021
Location: Norway
Posts: 6
Yes everything works.
What is very strange is that the return volt is constant even though I move the sensor arm manually up or down.
What is even stranger is that the height (mm) on the right side at the back shows exactly the same value as the left side (mirrors the value on the left side) even though I disconnect the sensor arms and move them manually up and down.
Is it possible that the workshop has programmed so that you have actually disconnected the right side at the rear and only the sensor on the left side controls the rear of the car?
Could it be possible that the left sensor is defective, or could there be a fault in the control module?
I tried right now with another sensor at the back, so I'm reasonably sure there are no faults on the sensor, cables, or mounting right side at the back?
19th Sep 2021 12:16 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4628
per.jone.bakker wrote:
Maybe a failure?
Voltage supply between 4,92 - 4,93 volt on the sensors.
Return voltage:
Front left height sensor - 2,9v
Front right height sensor - 2,88v
Rear left height sensor - 2,25v
Rear right height sensor - 4,68v (problem sensor).
Does this give any meaning?
It looks to me like you have a short to the signal side from the supply side on that sensor. You'll need to check the connector and loom which may mean stripping back the sheathing. If it's not there then look at the large two block connectors on top of the N/S/R chassis rail. The blocks themselves don't give any trouble, but the wiring entering and exiting can very often become frayed or chipped by stones/grit causing cables to short to each other or even break. Check them carefully and cut back the sheath if necessary. yµ (idµ - eAµ) ψ=mψ
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