P38 EAS Down on One Corner

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Posts
11
Location
UK
Hi All,

I’m after some help with an EAS issue.

For the past few weeks my P38 has been sitting low on the OSF wheel. Starts, drives, able to raise lower suspension with no faults. I suspected a height sensor issue even though out of both front ones that corner is the newest. Also I keep getting a hard fault sometime (cleared with NANOCOM) with message relating to height sensor. Anyway, bought a replacement and is still causing problems.

After fitting, and when connecting my RSW EAS unlock tool (v2) to calibrate the new sensor, whilst it connects and has good transmit/receive signals, the calibration tool is totally unresponsive. The only way I can get the suspension to work is to go into the settings and manually alter them.

In this screen the OSF is low and the NSF high. The software allows me to drop NSF and raise OSF and the suspension moves accordingly. When I hit ‘get sensor height’ it resets itself back to low OSF and high NSF.

Putting in a very large value for the OSF and very low value for NSF in the calibration screen, writing these then sending the car to that setting has no effect whatsoever.

Things I have done/checked outside of the EAS software:
  • The OBD2 plug under the dash was replaced not long back and works fine, evidenced by the perfect transmit/receive signal
  • White multiplugs in passenger footwell checked and both are clean. No corrosion on any wires/connectors.
  • Multipin connector on the EAS ECU under passenger seat checked and is clean. No corrosion whatsoever.
  • Both 3-pin connectors to each front ride height sensor checked and all female connectors on both as clean as a whistle.
  • Activated all solenoids/valves at the multiplug inside EAS box manually (pins 1-6 and 8) as mentioned on another thread and all solenoids returning a very strong click.
  • Both front airbags and airline inlets drowned with soapy water and no leaks. Same with pipes into/out of valve block. Airbags were replaced by previous owner with Dunlop items not long before I bought her coming up 6 years ago. No perishing/cracks.
  • Swapped new sensor from OSF to NSF and still same. I even tried swapping both original 'old' sensors but problem persists.
  • Both 'old sensors' bench tested using ohms on DMM. All okay.
  • Tried NANOCOM and that is showing that the OSF is significantly lower.
  • Yesterday I took the car out for a short drive and on return it was sitting nice, although a little high on rear wheels. Did the same again this evening and it is back to looking like a drunken sailor.
  • Compressor appears to be working fine (input and output) and is not running continually.
I am struggling as what to do next and is driving a patient man up the wall. Any thoughts/suggestions are welcome and appreciated.

[Range Rover P38, 1997 4.6 V8 HSE]
 
Hi All,

I’m after some help with an EAS issue.

For the past few weeks my P38 has been sitting low on the OSF wheel. Starts, drives, able to raise lower suspension with no faults. I suspected a height sensor issue even though out of both front ones that corner is the newest. Also I keep getting a hard fault sometime (cleared with NANOCOM) with message relating to height sensor. Anyway, bought a replacement and is still causing problems.

After fitting, and when connecting my RSW EAS unlock tool (v2) to calibrate the new sensor, whilst it connects and has good transmit/receive signals, the calibration tool is totally unresponsive. The only way I can get the suspension to work is to go into the settings and manually alter them.

In this screen the OSF is low and the NSF high. The software allows me to drop NSF and raise OSF and the suspension moves accordingly. When I hit ‘get sensor height’ it resets itself back to low OSF and high NSF.

Putting in a very large value for the OSF and very low value for NSF in the calibration screen, writing these then sending the car to that setting has no effect whatsoever.

Things I have done/checked outside of the EAS software:
  • The OBD2 plug under the dash was replaced not long back and works fine, evidenced by the perfect transmit/receive signal
  • White multiplugs in passenger footwell checked and both are clean. No corrosion on any wires/connectors.
  • Multipin connector on the EAS ECU under passenger seat checked and is clean. No corrosion whatsoever.
  • Both 3-pin connectors to each front ride height sensor checked and all female connectors on both as clean as a whistle.
  • Activated all solenoids/valves at the multiplug inside EAS box manually (pins 1-6 and 8) as mentioned on another thread and all solenoids returning a very strong click.
  • Both front airbags and airline inlets drowned with soapy water and no leaks. Same with pipes into/out of valve block. Airbags were replaced by previous owner with Dunlop items not long before I bought her coming up 6 years ago. No perishing/cracks.
  • Swapped new sensor from OSF to NSF and still same. I even tried swapping both original 'old' sensors but problem persists.
  • Both 'old sensors' bench tested using ohms on DMM. All okay.
  • Tried NANOCOM and that is showing that the OSF is significantly lower.
  • Yesterday I took the car out for a short drive and on return it was sitting nice, although a little high on rear wheels. Did the same again this evening and it is back to looking like a drunken sailor.
  • Compressor appears to be working fine (input and output) and is not running continually.
I am struggling as what to do next and is driving a patient man up the wall. Any thoughts/suggestions are welcome and appreciated.

[Range Rover P38, 1997 4.6 V8 HSE]
Do believe sensor settings have to be within 5 bits of each other on the same axle to get a correct response.
Better knowledge will be along soon to help
 
Check the white connectors in the passenger side footwell at the bottom of the A post for corrosion. They need to be cut out and soldered insulating with glue filled heat shrink. They are a regular cause of problems.
A greater than 5 bits a cross the axle is not good but will not stop the EAS or the diagnostics from working.
 
What are your Target & Actual height values ? This might help figure out what's going on.

Also remember when writing new values into the ECU, there are upper & lower limits that each height setting will accept. If you're trying to store values outside the expected range, the ECU will ignore you !!

These are the Max-Min values for each height setting:
1689068015564.png
 
What are your Target & Actual height values ? This might help figure out what's going on.

Also remember when writing new values into the ECU, there are upper & lower limits that each height setting will accept. If you're trying to store values outside the expected range, the ECU will ignore you !!

These are the Max-Min values for each height setting:
View attachment 292702
I didn't write then down but from memory the NSR was almost double the OSF in standard height. When I tried equaling them in the 'heights' tab on RSW software it was just sending the car back to the uneven height settings. I will try again tonight in the expected ranges and will report back. Thanks for everyone's advice so far
 
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