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Bench testing height sensors? More than one type?
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Kenny57
 


Member Since: 12 Apr 2020
Location: Essex
Posts: 169

United Kingdom 2007 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3
Bench testing height sensors? More than one type?

Hi,

Anyone know how to bench test height sensors, I seem to have more than one type fitted to my car.

Thanks in advance,
Ken 

Last edited by Kenny57 on 17th Sep 2020 9:04 pm. Edited 1 time in total 
Post #217433917th Sep 2020 2:29 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10363

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I think if it was me, I would have located the ECU (above drivers pedals I think, or near)
and measured the signal voltage returning from each sensor to see if in sensible range

I would have programmed the key to do height changes and then lowered the car and see if all values lowered. (monitor the sensor they are complaining about while moving)

and then raise to off road height, and check all values sensible.

If you see something wrong, investigate from there. by:

1. checking the sensors has a good 5v
2. checking the earth is good
3. checking the signal wire is continuous

The wiring diagrams don't give any clues that the fronts are different. But there was no need to really remove the fronts.  
Post #217435717th Sep 2020 3:33 pm
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Kenny57
 


Member Since: 12 Apr 2020
Location: Essex
Posts: 169

United Kingdom 2007 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Hi Pete,

thanks for the input. Smile

I'm just looking for how to test the functionality of a sensor. Some seem to be rheostats, some electronic.

Cheers 

Last edited by Kenny57 on 17th Sep 2020 9:05 pm. Edited 1 time in total 
Post #217437517th Sep 2020 5:33 pm
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mick_n3
 


Member Since: 19 May 2017
Location: Kettering
Posts: 421

United Kingdom 2008 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

When I replaced mine due to a fault all four had different part numbers, also worth checking the connector common place for water ingress causing issues, as one had done on mine.

https://www.advancedfactors.co.uk/height-sensors-12796-c.asp 
M6NIO  
Post #217437917th Sep 2020 6:05 pm
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Kenny57
 


Member Since: 12 Apr 2020
Location: Essex
Posts: 169

United Kingdom 2007 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Don't worry, I've just bought the complete set from AF Very Happy  
Post #217438917th Sep 2020 6:43 pm
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Kenny57
 


Member Since: 12 Apr 2020
Location: Essex
Posts: 169

United Kingdom 2007 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Sadly, not "don't worry"!

The sensor set I bought from AF were all of the type fitted to my front suspension. I fitted them assuming the change on the rears would be invisible to the car, but it certainly was not. I got C1A74-1C (AF) faults immediately on both rear sensors, a red suspension warning on the dash, and told to limit my speed to 30mph!

Interestingly, refitting the original sensors on the rears was acceptable to my car.

So, does anyone know if there's a way of "teaching" my car to accept the electronic style of rear height sensor?  
Post #217463218th Sep 2020 8:59 pm
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