*****IMPORTANT*****
Note that the wire color layout diagrams accompanying each picture are as seen FROM the CONTROL HARNESS SIDE of the connector with the release tab (for a male side connector) or locking notch (for a female side connector) on top. That is, you are looking at the wires going into the connector, OPPOSITE the side that is pictured. Like this: How to identify ECU pin numbers.
*******************Consider this part two of The 1990 Engine Control Wiring Harness; this article covers the remaining electrical connections in the 1990 2.0L engine compartment as well as the handful of connectors that run to the interior on the driver side. For reference, the main diagram below is as viewed from the front of the vehicle; the...