Doug
number 2.3.4 wires are coming from N3/1 LH-SFI module Ingition on between pin 5 & 2 1.0-1.2 VDC or engine at idle ETC >70c 1.3-1.7 VDC voltafe raises with RPM pin #4 12 V with ignition on pin #3 ignition off disconnect N3/1 and reconnect after 5 sec start engine ECT>60c RPM >2000 for 15 sec after 5 sec approx 3-5 VDC fpr 1 sec hot wire will glow at the same time.
pin 1 is ground. this is for 1993-1995 engine 119 LH-SFI only.

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MB STARS Master Guild Technician,17 years MB tech
14 years independent shop owner