Mitsubishi 3000GT Service Manual page 169

POWER SUPPLY (MFI relay) AND IGNITION SWITCH-IG <Up to 1993 model&
OPERATION
While the ignition switch is on, battery power is supplied to the engine control module, the injector,
l
the volume air flow sensor, etc.
When the ignition switch is turned on, the battery voltage is applied from the ignition switch to the
l
engine control module, which then turns ON the power transistor to energize the MFI relay coil.
This turns ON the MFI relay switch and the power is supplied from the battery to the engine control
module through the MFI relay switch.
INSPECTION
Using Scan Tool
Item No.
Function
Data reading
16
MULTIPORT On-Vehicle Inspection of MFI
FUEL INJECTION - Components
MFI relay
I
OFF
x 5
Engine control module
Engine control module connector
Data display
Engine control module
power voltage
lanition switch IIG1
A Equipment
side connectc
I
8
108
Check condition
Ignition switch: ON Battery voltage
I
4 Equipment
side connector
Standard value