Mitsubishi Stealth 1994 Import Service Manual page 684

MULTIPORT FUEL INJECTION -
ENGINE AND TRANSAXLE TOTAL CONTROL SIGNAL <A/T>
OPERATION
Three communication lines are connected between the engine control module and the transaxle control
l
module to send and receive the engine and transaxle total control signal.
If the transistor inside the engine control module changes from OFF to ON by the command of the engine
l
control module, the terminal having a voltage of 5 V applied to it from the transaxle control module is
grounded in the engine control module.
This will change the terminal voltage of the transaxle control module from HIGH to LOW.
If the transistor fitted inside the engine control module changes from ON to OFF, the terminal, having
applied to it a voltage of 5 V from the transaxle control module and grounded in the engine control module,
is released and the terminal voltage of the transaxle control module changes.from LOW to HIGH.
In this way, the terminal voltage of the transaxle control module is controlled by ON/OFF operation of the
transistor inside the engine control module in order to send signal.
On the other hand, the transaxle control module also controls the terminal voltage of the engine control
module by the ON/OFF operation of the transistor fitted inside the transaxle control module in order to
send signal. In this way, the engine and transaxle send control signal to each other.
On-Vehicle Inspection of MFI Components
Engine
control
module
'Engine control module connector