atholmotorcar said:
The pressure is monitored in the tank. It's not a switch like in the older trucks, the actual pressure is monitored. If the pressure changes when the valves are closed (no air required) the EAS shuts off, the warning lights come on, and a fault is stored. Static pressure something or other, it used to be very common before the compressor "campaigns" early on.
I think I understand what you're saying. Lets see.
You're saying that there is a pressure monitor of sorts in the tank. This pressure sensor, or monitor, has noting to do with the air compressor it's self. It's there to only monitor the pressure in the air tank.
That would mean there is more than one sensor in the tank, or somehow connected to the tank, right? How does the pump know when and when not to come on? Seems to me there has to be a pressure switch somewhere to tell the air compressor when to shut off and to come on.
I think you're saying that when the air bag system is inactive, and the air tank looses pressure, it creates a fault and it's stored in the ECU. That makes some sense to me, but also sounds complicated at the same time. I mean, in order for that to happen, the system was made way more complicated than it really needs to be.
The way I understand it, and again I'm no LR3 gooroo, is this.
-You have a compressor connected to a reserve tank
-The compressor will pump air into the reserve tank until XXXpsi is reached. Once that PSI is reached, the compressor turns off. Once the reserve tank falls below XXXPSI, the compressor comes back on.
-The tank feeds air to each of the 4 air bags.
-There is a minimum of two air lines running from the tank; one for the front air bags, and one for the rear.
-Each set of air lines, front and rear, must have a check valve of sorts to stop air from being pushed back into the reserve tank.
-There would also need to be two dump valves either on the front and rear air-lines, or on each air bag.
-Ride height sensors, mounted to the frame and to the suspension, monitor the amount of air sent to each set of air bags. These sensors talk to both the dump valves and the check valves to either raise or lower the vehicle
If this is truly the way the system works, and I'm not saying that this is the way it works, it would be wildly complicated for the lack of reserved air to create a fault.
......but that's why I'm asking.
Anyone have a diagram of the system?