Bosch system relays m 2.7

BOSCH SYSTEM RELAYS M 2.7

The exitation circuit of the 2 relays is supplied by turning the ignition key to MARCIA.

The operating strategy is as follows:

a. With ignition key in MARCIA position, the ignition switch supplies (from 15/54) the ECU, which in turn closes exitation circuit of relay (16) through terminal (pin) 36. This suplies injectors, control unit, fuel vapour recirculation solenoid, engine idle speed actuator, hot wire debimeter, turbo control solenoid and exitation circuit of fuel pump relay (17).

b. The exitation circuit of relay (17) is supplied by relay (16), while the circuit is closed by terminal (pin) in order to control the fuel pump operating strategy. Relay (17) also supplies the Lambda probe preheater coil.

1. Electronic injection-ignition control unit
2. Engine idle speed regulation actuator
3. Air flow meter (debimeter)
4. Lambda probe
5. Fuel injectors
6. Relay supplying control unit, injectors, engine idle adjustment actuator, fuel vapour recirculation solenoid, air flow meter, turbo control solenoid
7. Relay supplying electric fuel pump and lambda probe heating
8. Turbo control solenoid
9. Fuel vapour recirculation solenoid
10. Lambda probe fuse
11. Control unit fuse
12. Electric fuel pump
13. Connector block
14. Fuel pump fuse
15. Fuse block