I know there are a lot of threads on this topic, but I have a specific question. I am getting a suspension fault with my LR4 now all the way down at access height along with a signal stating that there is no communication with the TPS in the right rear tire. Is there a relation with a control module that would cause both of these to fault or is it just a coincidence?

Wilybyrd
'10 LR4 HSE

 

Well this was a simple resolution. If perhaps you are like my wife, and continue driving with a flat tire for some distance, the height sensors will actually react to the height difference and give you a fault. I don't think JLR designed it that way, but it at least made it so my wife couldn't drive over 35mph with a flat, lol. Put air in the tire and all gremlins went away.

Wilybyrd
'10 LR4 HSE

 

After installing the compressor, the suspension fault warning came on with system fault, special programs not available. When I started my car up I noticed the compressor wasn’t even TRYING to turn on. So I reset the battery, hooked the compressor up on its own to a 12v source (to see if the new one was broke). Ran fine. I recently was reading other forums and they said you can run a wire from positive to negative in the relay slot to simply test if the compressor is getting power from the wiring harness and connectors. Full power!

 

Can’t tell if there’s a question here or not. If jumping the relay works, then maybe you have a bad relay or bad signal to the relay. You also can probe the slots to see if you’re getting a signal to the relay when you should be, but easiest thing is to just replace the relay and see if it works.