Originally Posted by roverandom
I've been having similar issues with my 06 and it does seem a little unclear about the calibration? I had not realized that replacing one at a time and allowing it to self calibrate was a possible course of action though. I may have to try that.
Found lots of info on the connectors being at the root of the problem.
Now I'm no automotive electrical design engineer but, locating a critical sensor connection right in the wheel well may not have been best idea ever.
Re self calibration if only one sensor changed, I have read and heard both that it is possible and also not so - that a single sensor change requires the T4. I think the real answer is in between. To do a perfect job, yes a T4 calibration is required however the air suspension computer is supposed to have enough smarts to adapt to less than perfect calibration and sort things out over time.
Below is what the Calibration section of some LR service material says.
A calibration routine is performed using T4 to access the position of each corner of the vehicle and record the settings in the ECU memory. Once set, the calibration is not required to be performed unless the air suspension control module is removed or replaced, a height sensor is removed or replaced or a suspension arm to which the sensor is connected is removed or replaced. If the removed height sensor is subsequently refitted, the calibration procedure will have to be performed to ensure the integrity of the system.
If the air supply unit, the reservoir, a valve block, a damper module or the air harness is removed or replaced, the system will not require recalibration.
In other words, in a perfect world, a single sensor change requires the T4.
Yes, I would agree that having connectors and wiring lined up with the wheel wells may not be the best design. I have subsequently figured out that a primary reason for some of the systems being not where or how we would expect them is that Land Rover designed the 3 such that the body could and should be removed for routine service.
As such, the requirement to be able to easily separate the body from the frame led to some design aspects that are not the norm. I guess to service Kenworth's and the like, the cab pretty much tips away so the idea is not new. In the UK, lifting the body is routine for all but an engine oil changes. They do it all the time.