The Bosch Motronic system is one of the most iconic and long-running engine management systems in automotive history. From the legendary BMW M20 and M50 engines to vintage Porsche 944s, Audi Quattros, and early Volvo turbos, Motronic bridged the gap between purely mechanical fuel injection and fully modern digital engine control.
The Motronic 1.1 and 1.3 ECUs have a 35-pin connector. Here's a breakdown of the pinout: bosch motronic ecu pinout
Motronic evolved over 20+ years. Connectors changed from 35-pin to 55-pin to 88-pin configurations. Below are the most widespread versions. The Bosch Motronic system is one of the
These systems introduced sequential fuel injection (each injector fires individually) and often integrated knock control. The connector configuration changed to a (sometimes two separate connectors). and early Volvo turbos