Mitsubishi 1989-1993 GALANT Service Manual page 184

FUEL SYSTEM <SOHC-8 VALVE>
POWER SUPPLY
Engine
control module
OPERATION
While the ignition switch is ON, battery power
l
supply is supplied to the engine control module,
injectors, volume air flow sensor, etc.
When the ignition switch is switched ON, cur-
l
rent flows from the ignition switch, via the MFI
relay coil to ground.
Using Scan Tool
I
Function
Data reading
(9) Switch OFF the ignition switch.
Data display
16 Engine control module
power-supply voltage
confirm that the malfunction has been corrected.
relay '
" 2 "3
Engine control module connector
As a result, the MFI relay switch is switched ON,
and power is supplied, by way of the MFI relay
switch, from the battery to the engine control
module.
I
Check
conditions
Ignition switch: ON
"6
Harness
side connector
Standard value
I
Battery positive voltage
I