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Blondie's Avatar
 
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DME Pins Diagram Needed!

For an '86 NA.

Need a diagram labeling all the ports in the large connector for the DME...even a pic showing what each of the DME pins are for will work.

Thanks guys!

- Matt
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'86 Porsche 944, Guards Red

Nancy is currently [going in for the final 'once over' this week..]
AFJuvat - "Thou art affirmed: Go forth and inject fuel my son." LOL
Old 05-27-2007, 05:35 PM
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Did you look in the manuals? I looked it up and for the DME with a diagram of the 35 pin conector. It has them all numbered but I did not dig deep enough to see where all 35 pins go to. There is an electrical manual, complete with all the wiring diagrams too. I am not sure exactly what you are looking for, so it might be better if you looked up the info in the manuals rather than me getting you the wrong diagram. The manuals are online. Look through the recent posts, last 3 pages and you'll find them. I had the save them to my computer to view them properly.
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'87 944 N/A (first Porsche)
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Old 05-27-2007, 07:00 PM
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Will this help?

Ed
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78-924 traded for 80-931 traded for 84-944 traded for 85.5-944 (7th one now).
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Old 05-27-2007, 11:48 PM
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Nice work Ed! Where did you find it? Is the Turbo DME the same as the n/a or S?
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John
'87 944 N/A (first Porsche)
'95 E-350 Diesel
'03 S-Type Jag 3.0
'03 Taurus SES
'06 Eddie Bauer Explorer

RIP SoCal
Old 05-28-2007, 05:26 AM
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Aghhhh its for the Turbo lol (wicked find, though!)

..to narrow it down even more, I need specificially pins 2 and 3...

Which, of course, are for the turbo in this pic.

I just cant win...
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'86 Porsche 944, Guards Red

Nancy is currently [going in for the final 'once over' this week..]
AFJuvat - "Thou art affirmed: Go forth and inject fuel my son." LOL
Old 05-28-2007, 05:41 AM
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The DME may be different but are the pin numbers the same? I don't know myself but the plug "looks" the same. And I do not see anything labled for the pins that are turbo specific. I am thinking the DMEs are physically the same but are just programed different. Any idea?
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'87 944 N/A (first Porsche)
'95 E-350 Diesel
'03 S-Type Jag 3.0
'03 Taurus SES
'06 Eddie Bauer Explorer

RIP SoCal
Old 05-28-2007, 05:56 AM
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Well pin #3 in that pic is labeled 'KLR'....pretty sure my NA car doesnt have KLR lol
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'86 Porsche 944, Guards Red

Nancy is currently [going in for the final 'once over' this week..]
AFJuvat - "Thou art affirmed: Go forth and inject fuel my son." LOL
Old 05-28-2007, 06:25 AM
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Sorry
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'87 944 N/A (first Porsche)
'95 E-350 Diesel
'03 S-Type Jag 3.0
'03 Taurus SES
'06 Eddie Bauer Explorer

RIP SoCal
Old 05-28-2007, 07:12 AM
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Hey Blondie. I'm not to far. I have an extra engine harness if you want to borrow it and trace it out. Also have the shop manuals if you need to look at them. I could meet you at Tim's. That's the worlds greatest coffee shop for you Americans. I work at KidsAbility near Conestoga mall.

Did you know that Canadians are the worlds biggest coffee drinkers per capita.
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Old 05-28-2007, 07:27 AM
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That pic/diagram was in the Porsche Turbo Manual -
The closest in the 86 na in that manual is a little diferent - but useable. One could compair the differences.


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78-924 traded for 80-931 traded for 84-944 traded for 85.5-944 (7th one now).
UAV-M1 (Urban Assault Vehicle - Model 1)
Bless the lowered, and pass the nitromethane.
Pedal to the metal till you see the gates of hell then brake
NLA - No longer available is a four letter word
Old 05-28-2007, 09:56 AM
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The 86 944 is the same as my 87 924S. The DME pin 2 goes to the throttle switch pin 1 and DME pin 3 goes to the throttle switch pin 3 and the test connector.
87 944 shows completely differently. I have both diagrams if you want to look at it.
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87 924S 107k (miles) yellow
1969 Firebird Coupe (Full frame off restoration.)
98 BMW 740i
03 Altima Tin box
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Old 05-28-2007, 10:10 AM
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I need help with DME/injector wiring also

Can some kind soul please point out where those manuals are online to me?

I purchased a 87 924S in a non running condition "just need s a fuel pump" yeah right.
Basically the car will not start, no 12V at the Injectors, has 1.5v.
Got a new computer, checked all the sensors, good fuel pressure when cranking, good spark. just no voltage at the injectors, after many hours laying on my back and tracing wires here's what I have (and of course the big money question),
The wire from the pin (87) on the DME relay sends 12V down the Red/blue wire to the 9 pin connector under the hood (near the master cylinder) on it's way to the injectors,..., that wire is good, however on the other side of the connector the red blue wire splits into 2 red/blues and a black. According to the wiring diagram in Haynes, pg 0036H says that black wire goes straight to the DME,
I suspect this black wire is bad - shorted,...but don't precisely know where it goes into the DME.
Does it go to one of the pins? That is the question and if yes,..which one?
Currently with the computer out of the car, so it cannot be part of the problem that set of three wires shows that it has some continuity with ground - but not a dead short,...I think the black wire may be shorted and robbing electrons from the injectors.
Rather than cut the wires apart and test them (it could be one of the red/blues but I doubt it) I'd like to find the other end of that black wire that goes to the DME and check it directly.
Anyone have a 87 924S DME pin diagram? Or have some other great idea?

Dave
Ridgecrest, CA
87 924S
86 928S
73 914-8 (Buick 215)
7 others
Old 03-19-2011, 03:48 PM
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Here is where you can find the manuals
Documents - Porsche 951 - texasblake.com-

Good luck getting this sorted
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Old 03-19-2011, 04:18 PM
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Huh,...according to that, the black wire should only be connected for japanese market cars(C-15 and G-60) and it goes to the tachometer,...not the DME as the Haynes Diagram shows,...Plan: cut the black wire,...but not so badly that I can't reconnect it later when I find out I screwed it up
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87 924S
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Old 03-19-2011, 05:56 PM
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frustration building up

The black wire according to haynes goes to the DME, according to the Porsche manual it goes to the tach and is disconnected in USA cars. All this is OBE as I cut the wire and it did not have any effect other than to cause the tach needle to no longer jump when cranking. So I reconnected it.

Previously I had been testing voltage with at least one of the injectors plugged in,...when I checked it with all unplugged I have 12v at the injector harness all the way up to the injector connectors,...however,...if I plug any of the injectors harness connections in, the voltage drops to 1.5V,...doesn't matter which one I plug in. So I am a little confused about the test,...do you check voltage at the injectors with the injectors (all) disconnected? or not. If I am supposed to have 12V at the injectors with the connection made that means I have a short in all 4 injectors,...that seems mathematically improbable to have 4 simultaneous failures in the injectors with each having a short,...
I'm guessing that 12V is there all the time and the DME grounds the circuit in order to make the injector fire so I do have some sort of multiple failure scenario,...with a short in all the injectors? Still doesn't seem probable.

I am sure there is a problem with the injection circuit somewhere,...because I can spray Starting fluid in the air cleaner and it will crank up for a second or two,...so spark timing and all else is good except fuel.
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87 924S
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Old 03-20-2011, 10:47 AM
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each injector has 3-4 ohms resistance,...I think they should have 17ish, so I guess all the injectors are bad,...is there a way to clean them? I'm guessing the solenoid is gooed up,...but I don't know enough about them and how they work (or cost),...any advice on having them cleaned repaired (possible?) vs replaced.
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87 924S
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74 914-8 (Buick 215)
7 others
Old 03-20-2011, 11:39 AM
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You could send them to "Witch Hunter" to have them cleaned and balanced.

Also: On your starting problem it could be a bad fuel pump, or a bad DME fuel pump relay - those will also give the same symptions you have.
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78-924 traded for 80-931 traded for 84-944 traded for 85.5-944 (7th one now).
UAV-M1 (Urban Assault Vehicle - Model 1)
Bless the lowered, and pass the nitromethane.
Pedal to the metal till you see the gates of hell then brake
NLA - No longer available is a four letter word

Last edited by Cocacolakidd; 03-20-2011 at 12:05 PM..
Old 03-20-2011, 12:01 PM
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The plug wiring for my DME plug is not the same as above,...There are 2 rows, Row#1 of 17 female pins and Row#2 of 18 female pins.
Pins 14 and 15 are supposed to be the Fuel Inj wiring circuits,...however, counting from the cable end (in the 17 pin row),...spots #15 and 16 (spots 33 34 in the diagram above) are continuous with the injector wires,...and both of those pins (15 and 16) are continuous with each other,...spots 13 and 14 don't even have a female pin in them (empty).
The grounds are in the same positions as the dia above irrespective of whatever number they are being called.
This makes no sense at all according to the porsche wiring diagram, those injector circuits should be separate,...and in the #14 and #15 location,...that is unless porsche numbers them differently,...and they should be electrically separate. No other pins are continuous in the plug with the fuel Inj grey wire side circuits,...I tried them all. There is no evidence that anyone has been in the wiring either. Spoke with the previous owner, who said that after sitting for a while the car just would not start one day,...so no work or monkeying with the electrical circuit is suspected.
Does anyone have a true DME pin diagram for a 87 924S? Is it in the porsche manual some where? Searching page by page on the pdf file is maddeningly slow, but if it's in there somewhere I will do it.
Ideas?
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7 others
Old 03-20-2011, 01:54 PM
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Oh and thanks for the reply above,...there is fuel pressure, and if I use 12v to tap on the Inj I hear them click,...after clicking them all the car did fire for a second (using the residual fuel in the intake from the test).
This is a fuel Inj problem of some sort,...
Just to recap:
tested Fuel Pump and pressure, fuel inj work if manually triggered w 12V, gets 12v all the way up to the injector.
I am now suspicious of the grey wire side of the circuit,...if that side is grounded all the time through the DME them that explains the low voltage when hooked up,...all the trons are going to ground via the DME instead of cycling. So the injectors never get to cycle. Pins 15/16, the fuel inj harness grey wires are not shorted to ground (discontinuous to ground).
I've looked at the Speed sensors (2), throttle pos and all the rest of the troubleshooting items in the Clarks post - passes them all.
Originally thought that the original computer was bad - sent it off for testing and they said it was bad,...bought a second DME online,...did not work, sent it off for testing - bad,...bought a third remanufactured guaranteed computer and it doesn't work either.
The third computer is not labeled with the Bosch number,...so I wonder if it is the right one, even though the receipt says it is,...will call Ians and ask.
But the wiring issue has me stumped. Those circuits should be separate,...and they do not appear to be just by checking continuity.
I've looked at the harness for signs of rubbing and cracking and don't find any.

Completely stumped without that DME Pin diagram.
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87 924S
86 928S
74 914-8 (Buick 215)
7 others
Old 03-20-2011, 02:06 PM
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Found IT! Car runs now

Since I had strange trons flowing I decided to hook up a 6volt battery to the injector harness and back trace checking where I had 6 instead of 12 volts,...the injector harness red/blue wire somewhere in the bowels of the dash and wiring harness had shorted to the gray wires and to several others causing the wierdness at the DME harness,...clipped it at the 9 pin connector and ran a separate wire to the injectors,...fired right up. I loathe electrical problems.
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87 924S
86 928S
74 914-8 (Buick 215)
7 others
Old 03-20-2011, 05:36 PM
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Old 03-20-2011, 05:36 PM
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