Control relays
In addition to the fuel pump relay and the main relay, a phase change relay is usually added to this injection system (see Fig. 308).
Rice.
308 Control relay A - fuel pump relay, B - main relay, C - phase change relay
Possible malfunctions caused by incorrect operation of the control relays.
- Engine does not start or starts with difficulty (Relay A and B are not working correctly)
- XX frequency is unstable (A and C relays are not working properly)
Air flow meter Volkswagen T4. Motronic injection system .