Tson1 Hi! I have question about wiring on 190e 1991 m103 engine. I have connected to the original 25 wire ecu wires: k-full; k-idle; clt(coolant temp sensor). It is written that I have to connect AN to under wire pin 25, but I do not have this wire in the main bundle where I connect my wires. I can see that in the injector wiring end point there is one separate AN wire. What is the AN used for? Do I understand correctly that DH is the wire where the system recieves rpm information? DH wire is also in the main bundle but no instruction where to connect it. What should I do? Picture of the wires left at the moment:
JHM Hello! On the M103 engine, the RPM signal is routed through the AN wire. Locate this wire, extract it from the harness, and connect it directly to the designated RPM terminal on the stock ECU.
