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DME Pin 40, 41, and 50 Operation, Help Please

This is my first post on pelican. I have an 89 964 and I am installing a megasquirt 3 engine management system. I am just on the final stages of getting all my accessories hooked up.

I am stuck on the AC system control through the DME. They are pins 40,41, and 50 on the 55 pin DME connector.

The only information I can find on these pins is they are all outputs and AC Compressor controls - The DME control unit receives inputs and sends output signals over terminals No. 40 (AC Compressor), No. 41 (AC Switch), and No. 50 (AC Heating System Regulation)

If anyone has any information on the
- operation of these pins
- If they are power or ground controlled
- What voltage are they
- Or any other information that will help me set up these pins in my Megasquirt engine management system
Old 05-07-2017, 09:21 PM
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Dmitry at Pelican Parts's Avatar
 
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Hello and welcome to the forum! I've attached a link to our site's DIY tech articles on the 964 platform. There are several articles on the a/c system, take a look at them to see if they help you troubleshoot. If you need more details, please post a Comment just below the article and we'll have someone get back to you with specifics. Best of luck!

Porsche 964 and Porsche 993 Technical Articles Directory (1989-1998) | DIY Maintenance and Repair Projects for Porsche 911 model years 1989-1998 | Pelican Parts
Old 05-08-2017, 10:32 AM
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Quote:
Originally Posted by Dmitry at Pelican Parts View Post
Hello and welcome to the forum! I've attached a link to our site's DIY tech articles on the 964 platform. There are several articles on the a/c system, take a look at them to see if they help you troubleshoot. If you need more details, please post a Comment just below the article and we'll have someone get back to you with specifics. Best of luck!

Porsche 964 and Porsche 993 Technical Articles Directory (1989-1998) | DIY Maintenance and Repair Projects for Porsche 911 model years 1989-1998 | Pelican Parts


Hi thank you for the response. I had a look through the articles and was unable to find the information I was looking for. If there is anyone that could help that would be fantastic.


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Old 05-08-2017, 03:59 PM
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I don't know too much about how the dme treats these, but have you followed them in the wiring diagrams? Do they terminate into the ccu? Many motronic cars use ac input to adjust the idle speed. I wouldn't expect the dme to do much more than that with these pins.
Old 05-12-2017, 07:43 AM
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964 , a/c troubleshooting , a/c wiring , dme , megasquirt


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