Help finding DME Troubleshooting Chart

[Eyeflyalot]

I was hopping someone could help me locate a DME truobleshooting chart that was in a post in the not to distant past. It was handy in helping to locate a no start condition with the DME being the primary focus. It would ask if you had this problem then look here. It that did not fix it then go here. Etc, Etc, Etc....

Also, anyone in Dallas area recommend a shop they like? I know of a few, but have never taken a car to any of them.

Thanks

Scott

[Tim Polzin]

You mean this?

http://www.pelicanparts.com/911/technical_specs/911_DME_troubleshoot.htm

Tim

[Eyeflyalot]

I new I liked this site for a reason. That is EXACTLY what I was looking for!

Thanks Tim!!

[jwill911]

If you're just looking for a DME pinout here's an ASCII text version I find handy:


DME connections
-----------------------------------------------

1 coil ground (1)
2 micro switch (throttle, idle)
closure to ground at idle position

3 micro switch (throttle, wot + throttle valve) test connection b
closure to ground at wot

4 t54, starter active
+12 volts while cranking engine

5 gnd
6 gnd, air flow sensor, ntc I

7 air flow sensor +
8 speed sensor +
0.6 to 1.6 kohms between pins 8 and 27

9 air flow sensor -
10 plug for exhaust data (ground)
11 t54, speedo
12 test connection a
13 ntc II
1.4 to 3.6kohms at 70oF
160 to 210ohms at 212oF

14 t55, injector control signal
15 t55, injector control signal
16 gnd
17 gnd
18 +12v

19 gnd
20 control signal, dme relay
21 t54, goes to speedo
22 air flow sensor, ntc I +
23 .75ohm connection to pins 5, 25, 26, 8 & 27
24 oxygen sensor
25 ref mark sensor +
0.6 to 1.6 kohms between pins 25 and 26

26 ref mark sensor -
27 speed sensor -
28 altitude sensor
29 a/c compressor clutch 'on'
30
31
32
33 idle speed positioner +
34 idle speed positioner -
35 +12v



pinout, looking at the DME connector, NOT the DME...

+----------------------------------+
| 35 19 |
+--+ - - - - - - - - - - - - - - - - -+--+
| 18 1 |
-----------------------------------------+

the physical positions got skewed a little, but the top row is 35-19 and the bottom row is 18-1

and the Bentley manual has all this covered pretty well.

John
`87 Carrera Coupe

John

[Lorenfb]

For additional troubleshooting info, check out this web site (www.systemsc.com) on the Diagnostics page.