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Pneumatic compressor for classic

Fred02

In Third Gear
Hi to all of you:) !

Does one of you know how to check the compressor of RRC from dec 1993?
The problem is that it does want to start and remains completely quiet!
Can it be dismantled and check directly on a battery as a fan for instance? Where are the related fuses?
Thanks for your help because as I have a leak on the rubbers, (will all be changed next week) the babe is on the ground:eek: :eek: :eek: at the moment...
Fred
 
If you had a leak then the chances are that the compressor has been running constantly possibly burning it out. Sorry to be the doomsayer and make sure to get checked out properly.
 
Hi Deano,

Thanks for your comments and hope you are wrong but :( probably...
How can I check it? Do you have any ideas cse do not know how to proceed.
Thanks for your help. Fred
 
Hi,

So have check the compressor over the weekend and it works when wired directly on a battery!!
So what can be the problem, a sensor, a fuse, a sonde etc. Do you have any idea where to look?

Thanks for your assistance, Fred
 
I don't know if this helps: I'm in the middle of trying to sort out my air suspension and I think I'm about to ask Jon to source a new compressor for me.. anyhow, while my ECU is disconnected, I've been running my compressor and valves "by hand".

I found this:

To get mobile I performed the following:
1. Unplug the ECU controlling the suspension.
2. On the amp plug (if you pull back the sleeve all the wires are numbered) loop pins 1 & 8 to run the compresser for a couple of minutes to charge the system.
3. Then to raise each corner connect the following together with a loop of wire:
3.1 left rear pins 26, 11, 8 & 1
3.2 left front pins 26, 10, 8 & 1
3.3 right rear pins 26, 28, 8 & 1
3.4 right front pins 26, 27, 8 & 1
(pin 26 enables air from pump)
4. To lower each corner:
4.1. Left rear pins 11, 9 & 1
4.2. left front pins 10, 9 & 1
4.3. right rear pins 28, 9 & 1
4.4. Right front pins 27, 9 & 1
(Pin 1 is power, pin 8 is air inlet solenoid, pin 9 is air exhaust solenoid)
If you wish to completely deflate the system then connect pins 1, 8 & 9.
If you then leave the ECU unplugged the suspension will remain pumped up until you can have the system diagnosed properly.


here: http://www.carelect.demon.co.uk/index.html

The advice is nearly right:

Pin 1: power
Pin 8: compressor relay
Pin 9: exhaust valve
Pin 10: left front
Pin 11: left rear
Pin 26: fill valve
Pin 27: right front
Pin 28: right rear


When you take the ECU plug off, you'll find there are two rows of pin-sockets. Holding the plug so that you are looking at the rows of sockets, with the cable coming from the left, the top left socket is number 1, the bottom left is number 19.

You should find that shorting pins 1 and 8 makes the compressor run. If not, check the fuses, the relay and the compressor itself.

I've just bought myself a spare ECU on e-bay. I'm going to pull it apart to see if I can do anything with the innards, then keep the circuit board for a spare and use the connector to make up an emergency box with half-a-dozen switches for the basic up-down functions.

FWIW the connector on the ABS ECU appears to be identical, so, if you had one of those, it might serve for a similar temporary solution.
 

Attachments

  • Air suspension pins.doc
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Thanks for all those explainations...I now have to learn how to read a schema, it will be a good exercise :) Have been working on it today and now something is strange...Last weekend I tried the compressor directly - it worked, but have tried once more today before putting it back but it was dead again, I really do not understand! Has anybody experienced such a situation? Thanks for you help, Fred
 
Not with the compressor itself, but I've removed iffy electric motors, found they worked, refitted them, and then had them fail again within a few days on several occasions. It usually points to badly worn graphite brushes.

HTH!

Thanks for all those explainations...I now have to learn how to read a schema, it will be a good exercise :) Have been working on it today and now something is strange...Last weekend I tried the compressor directly - it worked, but have tried once more today before putting it back but it was dead again, I really do not understand! Has anybody experienced such a situation? Thanks for you help, Fred
 
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