Need plug diagrams
 

I've been trying to address my O2 sensor error on my 1990 190e 2.6. I'm getting a constant 50% duty cycle and 22 LED flashes, which indicates a problem w/ the heating circuit. My CD manual is telling me to test the signal from the O2 sensor to the CIS-E control unit, jack 8, and pull off the fuel pump relay and bridge jacks 7 and 8 and test for voltage.

My problems are these:
1) the plug to my CIS control unit is different than the one shown in the manual (which I believe shows the 1987 model); jack 8 has no contacts in it.
2) I have a MAS relay, not a fuel pump relay.

Does anyone have diagrams for the 1990 plug into the CIS control unit and/or the MAS relay? Any input appreciated.

Nevermind, further examination of the PDF's on the CD have led me to the proper diagrams.

Turns out my problem was not re-seating the MAS relay properly after pulling it off.