One of the most active automotive forums on the web. Users frequently trade factory wiring diagrams, dealer-level repair manuals, and custom ECU connection schematics. 13. GarageForum
Complete Guide to ECU Datasheets: Pinouts, Wiring Diagrams, and Free Resources
An open, crowdsourced repository where global electronics enthusiasts upload hardware schematics. Its automotive category contains rare diagrams for older Bosch, Siemens, and Marelli modules. Tuning Tool Manufacturer Documentation 6. Alientech Support Database (KSuite Free Manuals)
One of the oldest and largest online directories for electrical connectors. It includes a massive, searchable automotive section covering standard OBD2 layouts, proprietary diagnostic ports, and internal module pinouts. 3. Car-Pinout.ru
Detailed address mapping for:
– TriCore-based direct injection platform managing newer VW/Audi TSI and TFSI platforms.