Starting with model year 1975, VW busses of the era featured fuel injection via Bosch's L-Jetronic system, with an analog Electronic Control Unit (ECU) to manage fuel induction. Over the years Bosch and VW produced different types of ECUs, with a plethora of part numbers. This guide seeks to provide

A quick visual reference to the pinout (wiring) of the Electronic Control Unit (ECU) used in the 1975-1979 VW Type 2 bus, from the harness side. The ECU was at the heart of the fuel injection system Volkswagen chose to reduce emissions and for better fuel economy: Bosch's L-Jetronic. Connector