While PDFs are usually black and white, they denote wire colors with text abbreviations (e.g., SW/GE or BL/YE ).

In a Bosch Motronic PDF, you will typically see:

Below is a of what a typical Motronic ME7.5 pinout PDF shows (actual PDFs contain 20–80 pins with wire colors and connector views):

A standard Bosch wiring schematic typically details several primary systems: Bosch Ecu Diagram - MCHIP