Schematics for engine harness

Pin # Original colour Wire area Connector Pin # Note
1 Black/Grey 0,75 mm2 Injector Cyl. 1 2 Pin 1->Common 16
2 Grey/Blue 0,75 mm2 Injector Cyl. 4 2 Pin 1->Common 16
3 Black/White 0,75 mm2 Injector Cyl. 7 2 Pin 1->Common 17
4 Blue/White 0,75 mm2 Injector Cyl. 10 2 Pin 1->Common 17
5 Brown/Blue 0,75 mm2 0115457128 1 2-pin   connector, right side
Pin 1
Pin 2->Common 16
6 Yellow/Brown 0,75 mm2 0115457129 2 2-pin   connector, right side, Pin 2
7 Blue/Grey 0,75 mm2 0115457130 1 Same   as above, Pin 1
8 N/A N/A N/A N/A
9 Green/White 0,75 mm2 1265403081 2 4-pin   connector, left side
Pin 4 -> loop Pin 3
10 Green/Yellow 0,75 mm2 1265403081 1 Same   as above
Pin 2
11 Green/Brown 0,75 mm2 1265403081 3 Same   as above
Pin 1
12 Red/Grey 0,75 mm2 Injector Cyl. 2 2 Pin 1->Common 16
13 Yellow/Grey 0,75 mm2 Injector Cyl. 5 2 Pin 1->Common 16
14 Red/White 0,75 mm2 Injector Cyl. 8 2 Pin 1->Common 17
15 Yellow/White 0,75 mm2 Injector Cyl. 11 2 Pin 1->Common 17
16 Blue/Red 1/0,75 mm2 Injector Cyl. 1-6 1 Common 16, Cyl. 1-6,   mm.
17 Green/Red 1/0,75 mm2 Injector Cyl. 7-12 1 Common 17, Cyl. 7-12,   mm.
18 N/A N/A N/A N/A
19 Green 0,75 mm2 0195455428 Single wire connector
20 N/A N/A N/A N/A
21 N/A N/A N/A N/A
22 N/A N/A N/A N/A
23 Brown/White 0,75 mm2 1265403081 4-pin   connector, right side
Pin 4 -> loop Pin 3
24 Black/Green 0,75 mm2 1265403081 Same   as above
Pin 1
25 Brown/Green 0,75 mm2 1265403081 Same   as above
Pin 2
26 Green/Grey 0,75 mm2 Injector Cyl. 3 2 Pin 1->Common 16
27 Purple/Grey 0,75 mm2 Injector Cyl. 6 2 Pin 1->Common 16
28 Green/White 0,75 mm2 Injector Cyl. 9 2 Pin 1->Common 17
29 Purple/White 0,75 mm2 Injector Cyl. 12 2 Pin 1->Common 17
30 Brown/Grey 0,75 mm2 0115457128 1 2-pin   connector, left side
Pin 1
Pin 2->Common 17

The front connectors

There are three types of connectors in the front of the harness, one 1 pin, three 2 pins and two 4-pins. The 1 pin and 2 pin connectors are not sealed and very easy to open, unfortunately allt the 2 pin ones I have ever dealt with have broken when opened. Good part is that they are 24 SEK at Mercedes-Benz.

So, we need to cut 2 of these open, first remove the metal ring at the front:

Then get my new favorite tool for this job, the small hacksaw out:

Pry it open and have a look inside, as suspected, another tragedy, unfortunately this brakes into three pieces, 2 halves and one center/guidance piece:

Pin 4 is looped/jumped to pin 3:

New wires and some reused, some new sheathing:

Remember to put all the sheathing and the shrink tubing you want on at this point, then start soldering, here one of the 4 pin connectors, you can see the new loop between pin 4 and 3:

New sheathing, some shrink tube, and the centrepiece glued back:

When the glued centrepiece has dried, glue EVERYTHING, underneath the shrink tube, all edges, well, you get the point:

Shrinktubed, sanded, cleaned and some black pemanent marker:

The other end

Time to start in the other end of the Engine harness, first just trying it on for looks:

Taken the wiring off the plastic backing:

Now is a really good time to put the rubber hose/protection back, I forgot to do this and it is a pain in the famous area to do it when you got some connectors in place:

Cut all the wires to the correct length and started the layout:

The old one:

Started putting the sheathing and the rubber seals in places:

Put the small silicone seals in place: