16 port tester ports '93 300D 2.5 ? - PeachParts Mercedes-Benz Forum

fm900 · #1 09-12-2014, 07:25 PM

Hi guys, you can see the PIC, does these ports look correct to you. I know each female only fits in the correct male upon inspection. The reason I need help is I found a loose terminal out of the receptacle, marked with a TINY #2 on one side and a 0 on the other, there is no 0 port, and the 1. 2. 4. port is filled with a 4 port male from the rear, no wire is in the #3, (PART OF THE 4 TERMINAL MALE PLUG INTO THE BLOCK). it FIT in #7 I believe so that is where I put it, But don't know if this is correct. You can tell which ports are filled shinny plugs in the ports. THANKS! Frank in VA.

vstech · #2 09-12-2014, 07:36 PM

Send a pm to jay_bob he'll have a plan

dieselbenz1 · #3 09-12-2014, 07:45 PM

I think this may be of help to you.

Mercedes old 16 pin diagnostic connector pinout diagram @ pinoutsguide.com

fm900 · #4 09-12-2014, 08:20 PM

As u can see ONLY 1-2-4-6-7-and 16 are filled, I don't even know if any are missing.

jay_bob · #5 09-13-2014, 12:42 AM

That linked document is a start. For the actual wiring diagram for your car go to w124-zone.com and go to the factory service manual link (you will have to register).

Most of those pins in that document are not used on an 93 124 Diesel. The worst case would be a gasser with 4Matic, there are several more pins used there.

The filled pins you described sounds about right for a 93 300D-2.5

I keep a copy of that wiring diagram in my "iBooks" in my iPad, it is my constant companion when working on my car (or answering systems questions on a 124).

Pin 1 ground - brown
Pin 2 rpm from ring gear sensor - green/yellow - 2 wires (144 pulses per rev)
Pin 4 EDS blink diagnostics from EDS box - gray/yellow
Pin 6 SRS blink diagnostics from SRS controller - black
Pin 7 Climate control blink diagnostics from pushbutton unit - yellow/white
Pin 16 +12 V dc from fuse 9? - red/white? - could not find this in the sheets for 93 300D-2.5, but this is how the gassers from 90-up are wired.

Blink diagnostics are read from an impulse counter. You can build one yourself from Radio Shack parts (hurry before they go under).
You need a red, yellow, and black test lead with banana plugs.
1 270 ohm, 1/2 watt resistor (red-violet-brown-gold)
1 inline fuseholder
1 1/2 amp fuse
1 red LED, try to get one that has panel mounting hardware, if not superglue it in the hole
1 pushbutton with normally open contacts
1 enclosure to put it in, you can even use an old pill bottle.
1 pack of small heat shrink tubing, to cover your joints.

Drill holes in the enclosure to let the leads out, a hole for the LED, and a hole for the button.

The test leads need 1 end with the plug and the other end cut and stripped.
(feed the leads through your enclosure first)
Red lead connects to one end of the fuse
(Put the heat shrink on before you solder, but don't get things too hot or it will shrink on you before you are ready)
Other end of the fuse connects to one end of the 270 ohm resistor
Other end of the 270 ohm resistor connects to the long lead on the LED
Short lead on the LED goes to the yellow test lead and one terminal of the switch
Other terminal of the switch goes to the black lead
Install the parts in the enclosure

Generally, to use it you plug the red into 16, the black into 1 and the yellow into the circuit you want to test. Then following the procedure in the appropriate chapter of the FSM you push the button and release then count the blinks. To clear the codes you hold the button in longer. But be sure to read the procedure for the specific device you are testing first.