E320 94 Compressor not engaging
 

On my E320 94 the Compressor not engaging. I did evacuate the system recharged and drove it for like 15 min then the compressor cut of.
When I restart the car sometimes its works sometimes it does not.
Pressure in the system was checked by my Indy and it check out ok.
What could be?

PS also the check engine came on. I did check the codes and found only code2 and 14 on pin 14
No codes on pin 8

You need the codes from the built-in LED/SW when there is the CE lamp.... The Diagnostic Module N/59

We have been thru this before , but I will explain it again.

The CE lamp is activated by the EMMISSIONS Diagnostic Module [ N59]
If it detects a fault that will effect emmissions mandates, it lights the CE lamp , notifying you that it has detected a fault/faults and stored that info in the DM. If you have a CE lamp displayed, you now know have a code stored in the DM and something is wrong.
So, you go to the DM and get that code/s. That can be done with the Owner Access Built-In LED/SW button on the Diagnostic Box..you push the button just like you do with the code tool you made, but you do not need a tool b/c it is already there [ Built-IN]

Pins 8 and 14 are for OTHER MODULES and do not bring up a CE lamp..only the DM does that. Those pins require the tool.

Go here again and look at the VERY FIRST list of codes ..notice it says for Emmissions-BUILT-IN Diagnostic Module in the title..those are the codes that trip the CE lamp. Push the button and get those codes. They will tell you why your CE lamp is ON.
And then you can clear the DM of codes with the same Built-In Sw., which will turn OFF the CE lamp.

http://www.peachparts.com/shopforum/showthread.php?t=107630

Thanks a lot Arthur. I got the codes 5 and 7 at that build in led.

Also what pin should I check for climate control unit?

That chassis does not have one.

I did bridge the wire 5 and 7 at the Klima relay and I got the compressor running. Is this a clear indication of a bad Klima relay or it could be the a/c compressor speed sensor ?