Power Supply/MFI Relay

CIRCUIT DIAGRAM

OPERATION
In this power supply circuit for ECU, power is supplied to both IG [ON] and ECU. The control relay supplies power to the fuel pump, injector, AFS, etc. in addition to ECU.

INSPECTION





Using Multi-use tester














HARNESS INSPECTION

CONTROL RELAY INSPECTION

CAUTION When applying battery Voltage directly, make sure that it is applied to correct terminal. Otherwise, the relay could be damaged.








(1) Check continuity of the control relay coil.








(2) Check the continuity of the control relay contacts between terminals (1)-(4).








(3) Check the continuity of the control relay contacts between terminals (2)-(4).
(4) If not as specified, replace the control relay.