[tony1963]

I have about every diagnostic connector/software there is as a dealer. I just realized that we do not have a diagnostic connector for the old Mercedes 9 pin connector, like the one under the hood of this 1985 model 300D.

My Snap-On software goes back to 1980 so I'm wondering if Snap-On has them or if anyone here has some laying around?

Not that there's anything wrong with this one, I just wanted to fiddle around with the software.

 

[444]

What would it diagnose? The only connector I can think of is the round one that hooks to the front crank sensor.

 

[Rmac58]

^ Agreed, it'll read the rpm, that's all.

Mechanics will use it to determine, fill in the blank, at various engine speeds, just takes one person.

 

[tony1963]

I'm not trying to "diagnose" anything, as mentioned in the OP. I'm just curious what it will do. There are a total of five out of nine pins that have a metal insert. Has to be more than RPM. If there is a hot, a ground and an RPM, that's three out of five.

 

[::matthew]

I always figured it went to the EGR comp...

 

[444]

I don't have an 85 to look at right now, but I'd look at where the wires went. If it only goes to the sensor, then that's all it does, if there are also wires headed elsewhere then the mystery continues (then again the emissions stuff is the only computer in there).

 

[carterskemp]

in case your still wondering

it is just a diagnostic for an electronic tachometer sensor as found on a few of these cars. here is a link to a PDF that explainsit and it's use:


http://www.mbelectronicupgrades.com/Tachometer Amp Diag Tool User Guide Rev A2.pdf