So the question of the hour, does the newest software from LR set it at 250 or 210

 

I did a search on Disco3 using AMK+compressor+pressure as my search term. Many threads came up as below, an 11 page thread being one of them.

One of the posts within that thread near page 10 makes reference to 1780kPA nominal pressure which converts to 258 psig. This is a May 2015 post. The inference is that is the air tank pressure - well actually gallery pressure, but the comment is vague and I can find no other references to pressure in that thread however there is a link to another thread re pressures.

What I then did find is references to the "new" AMK software needing a fix or fixes as it seems to throw false error codes and hence turns the suspension light falsely on - it really is murky, so no, I do not have an answer.

I am now starting to believe the new AMK is perhaps supposed to beable to operate at or near the 258 psig level and the Hitachi's were derated to the near 200 psi level sometime prior to them being discontinued.

DISCO3.CO.UK - View topic - How To - AMK Suspension Compressor Replacement

 

Well, I am on a mission now to find a way to drop the pressure to 200 PSI. Not knowing how to re-program the computer. I wonder if I can install a potentiometer after the pressure sensor to artificially alter the pressure readings

 

I kind of doubt that adding resistance will work in this case but it may be worth experimenting with. It will be tricky.

The sensor is a 3 wire unit, the YB conductor, (Yellow with Blue tracer), being the 5 volt supply reference voltage so I doubt that would be the wire to load, (but perhaps easy to experiment with); the YK conductor, (Yellow with Pink tracer), with the ground so probably not that one. I suppose the OS conductor, (Orange with Grey), the pressure signal conductor, is the logical one to load up.

It may however be that increasing volts or amps means higher pressure and hence the computers then tell the compressor to shut down. If so, then adding resistance would raise the shut down pressure. I guess one would have to take some measurements off the OS conductor to see if one can detect any change and in what direction prior to adding any resistance. Reducing the 5 volt feed voltage by adding resistance may be the least tricky to implement.

If you attempt any of this, please let us know what the results were.

Below is a LR description of the pressure sensor taken from LR literature..

The valve block also contains a pressure sensor which can be used to measure the system air pressure in the air springs and the reservoir. The pressure sensor is connected via a harness connector to the air suspension control module. The control module provides a 5V reference voltage to the pressure sensor and monitors the return signal voltage from the sensor.

Using this sensor, the control module controls the air supply unit operation and therefore limits the nominal system operating pressure to 244 inch lbs. 2 (16.8 bar gage) .

 

Thank you for that info, I am hoping its a matter of adding resistance to one side or the other. I will have to find a way to plug a multi-meter in and watch voltage out at various pressures.

 

The link below is to a product called Posi-Tap.

These are a pin like assembly that pierces a conductor's insulation rather than cutting into it like the squeeze type connectors.

They work well for tapping to a line without doing much harm.

posi tap | eBay