Under the driver side dash there are two 55 pin connectors that connect into boxes that look like ECMs. The wiring diagram that I have doesn't show two 55 pin connectors so I am confused. Could someone tell me which box is the ECM. I'm trying to check to see if I am getting either an rpm sensor signal or a crankshaft position signal at the ECM. The engine cranks but I don't have spark and the fuel pump never runs.


Never mind. It's the one on the top. I still don't know what the bottom one is but now it's back to the oscope to see if I have signals from rpm and crank sensors.