This diagram is valid for 8-bit 300ZX ECUs, which corresponds to model years 1989 to 1994.
I compiled the diagram from a variety of sources, so please suggest corrections if you believe they are needed. Also feel free to recommend better labels for any pins that could be named more appropriately.
Click the thumbnail below to view the document. Alternatively, you may right-click and select 'save' to download a copy for future reference.
I've also hosted a copy of Tony Ferraro's color-coded version of the diagram, which is available through the following thumbnail. Eventually I'll get around to creating a colored version of the original PDF.
ECCS Wiring Diagram
The following is a complete image of the ECCS wiring diagram, as provided by the factory service manual.
Note that this schematic is specific to federal emissions vehicles for years 1990-1992. It seems to be the most popular ECCS schematic floating around.
Click the thumbnail below to view the image. Alternatively, you may right-click and select 'save' to download a copy for future reference.
The following is a colored version of this diagram, which was compiled by Lee Wood.