This manual covers the L-Jetronic fuel injection system, a foundational electronic fuel injection technology widely implemented by Volkswagen across various models, including the Golf, Passat, Scirocco, and Vanagon, from the early 1970s through the late 1980s. These vehicles, equipped with 4-cylinder or 6-cylinder engines ranging from 1.5L to 2.4L, represented a significant advancement over carbureted systems, offering improved fuel efficiency, emissions control, and drivability. The L-Jetronic system, a pulsed, batch-fire injection method, utilizes an Engine Control Unit (ECU) to manage fuel delivery based on inputs from sensors monitoring airflow, engine speed, and other parameters. Volkswagen's legacy of engineering robust and practical vehicles is evident in the widespread adoption and reliability of these systems when properly maintained.

This comprehensive technical service and repair manual provides essential information for understanding, diagnosing, and maintaining the L-Jetronic fuel injection system and its related components. It delves into critical areas such as the fuel delivery network, air intake system, ignition system interactions, and emissions control integration. Detailed procedures for component testing, replacement, and adjustment are included, alongside troubleshooting guidance for common issues like Air Flow Meter (AFM) failures or Auxiliary Air Regulator (AAR) malfunctions. The manual also contains vital technical specifications and detailed electrical schematics, making it an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their Volkswagen vehicles equipped with this iconic fuel injection technology.

This manual covers the L-Jetronic fuel injection system, a foundational electronic fuel injection technology widely implemented by Volkswagen across various models, including the Golf, Passat, Scirocco, and Vanagon, from the early 1970s through the late 1980s. These vehicles, equipped with 4-cylinder or 6-cylinder engines ranging from 1.5L to 2.4L, represented a significant advancement over carbureted systems, offering improved fuel efficiency, emissions control, and drivability. The L-Jetronic system, a pulsed, batch-fire injection method, utilizes an Engine Control Unit (ECU) to manage fuel delivery based on inputs from sensors monitoring airflow, engine speed, and other parameters. Volkswagen's legacy of engineering robust and practical vehicles is evident in the widespread adoption and reliability of these systems when properly maintained.

This comprehensive technical service and repair manual provides essential information for understanding, diagnosing, and maintaining the L-Jetronic fuel injection system and its related components. It delves into critical areas such as the fuel delivery network, air intake system, ignition system interactions, and emissions control integration. Detailed procedures for component testing, replacement, and adjustment are included, alongside troubleshooting guidance for common issues like Air Flow Meter (AFM) failures or Auxiliary Air Regulator (AAR) malfunctions. The manual also contains vital technical specifications and detailed electrical schematics, making it an indispensable resource for owners, mechanics, and technicians seeking to ensure the optimal performance and longevity of their Volkswagen vehicles equipped with this iconic fuel injection technology.