Air Suspension readings.

2003 diesel range rover.L322
I wonder if anyone can make sense of the readings shown on the diagnostics box for my levelling system.
Currently I get the fault up 'Air Suspension Inactive' (all levelling lights are out) when I try to operate the system. If the system is re set I can drive the car around with the levelling system locked out (Lights stay on). Therefore no bags are leaking as the car stays up all the time. The readings I get are as follows

F=Front R=Right or Rear H=Height L=Left

Value in the highest position
FRH 57.0
FLH 29.3
RRH 17.1
RLH 56.7
Value in the Normal height position
FRH 39.8 12.8
FLH 29.3 12.3
RRH -2.3 1.1
RLH 46.6 1.9
Value in the lowest position
FRH -37.5
FLH -45.0
RRH -56.8
RLH -21.2
These values stay roughly the same whether the car is raising or lowering apart from the middle set of figures which show a complete different set of values.
Does any of this information give a clue to what the fault is. We connected the test box to another Range Rover that is working and the readings were very constant, nothing like the variation above in the middle section.

Thanks for your time. Nick

can these be recalibrated with blocks of some sort? On the p38 I used blocks I made myself, not to sure about your model!!
it does look like your RR has its own routine going on!!
some small differences between fr and fl, re and rl are acceptable.
we need an " l322 know it" here!!

Does anyone have any advice please.

Thanks

Nick

come on guys!!

I'm having me dinner......be with you soon....

chomp chomp! what are you having?

Italian salad with Red Grapes, Bell Peppers, Cucumber, Cheese, Parma Ham, Bulgar Wheat with Wholegrain Rice and Quinoa, Lemon Herbed Chicken Breast and Salad Cream.....

Anything else you wanna know?

I am 6'3", 39, size 12 feet, I dress to the left and I am rather keen on long walks, reading workshop manuals and quiet nights in front of Landy Zone.....

you forgot to add sarky and grumpy!!!! kiss kiss

I guess the first question is - What diagnostic system are you using?

Height sensors are not calibrated items, as such variations in figures between vehicles and also between height sensors on the same vehicle, is to be expected.

The readings should be within a few +/- of each though across the axle.

The L322 calibration requires to set the vehicle at a datum height that is preset in the EAS ECU - lets call this figure 50 (purely indicative)

When you go to calibrate the car, it raises all four corners of the vehicle until all the height sensors read 50. You tell the system what size rims you have and then you then have to go round and physically measure the height the vehicle is sitting at between the top of the wheel arch and the bottom of the wheel rim. Put this information into the system and the vehicle now knows how the car sits when all the sensors read 50.....it also knows that at the various ride heights what the physical measurements should be...lets say 720mm for the datum height.....

So lets say you have measured 735mm at the datum height, the system now knows that when the sensor reads 50, the car is at 735mm.....so when it needs to be at 710mm for normal height, the ECU can work out what the sensor should read to get a physical height of 710mm......

What you are reading there is more than likely the sensor feedback data.....the readings of which would mean little on their face value.....

Is the car sitting square and level before it faults out?

Also what codes are stored in the ECU error memory when it goes into fault? Height readings are one thing, but a fault code will be stored when it goes into hard fault (all lights off).

The EAS ECU is tucked up the side of the dash (pax side on a UK car) and has been known to suffer water damage, so I'd pull it out and check the connections for corrosion etc.

Now, can i have me pudding??

come on already!!!

ooh, your back!!

what you having for pudding? jam on toast?

Mark Piercy said:

what you having for pudding? jam on toast?

Click to expand...

Nothing so luxurious.....just a small bowl of ice cream and butterscotch sauce!

can I, errr call round...mmm

get yer own!!!

I'm so upset....

I'm sure you'll recover....

I appreciate your support...

anyhow whats your take on the op's problem?