Subject	Figured out the problem...
Posted by	JMartz on July 20, 2011 at 9:02 AM
	This message has been viewed 135 times.
In Reply To	Air conditioning question... posted by JMartz on July 19, 2011 at 10:06 AM
Message	I noticed the system worked by simply bypassing manually the a/c relay. That meant the dual pressure switch was letting curent through. Looking at the wiring diagram I saw that the ECU provides the ground to energize the a/c relay. My ECU had ceased to accept communication with my ConZult program. That was the final clue. A "new" ECU made the a/c work. Apparently the grounding transistor for this circuit is toast as the ECU runs the engine just fine. Weird, unexpected and hard to diagnose problem.
Follow Ups	Air conditioning question... - JMartz 10:06:56 07/19/11 Did you check the wire coming off of the compressor? - Woody75 (Denver) 10:20:44 07/19/11 Hey Woody, removed shroud, fan and rad to gain access - JMartz 12:53:41 07/19/11 Re: Hey Woody, removed shroud, fan and rad to gain access - Onyxblue 17:06:03 07/19/11 Thanks for the tip. - JMartz 19:24:32 07/19/11 I ran a ground to the frame as a temp fix. - ELDIABLO 10:52:24 07/21/11 you're probably overcharged unless you had a leak - aliaZ 22:28:19 07/20/11 stop guessing and throw some gauges on your system - aliaZ 17:25:29 07/19/11 Adding refigerant did not restart the compressor. (n/m) - JMartz 09:03:41 07/20/11 Figured out the problem... - JMartz 09:02:41 07/20/11 the same happened to my 240sx - aliaZ 22:26:31 07/20/11
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