Mitsubishi 3000GT Service Manual page 277

ACTIVE EXHAUST COIWTROL UNIT <Turbo>
OPERATION
Muffler noise is controlled1 by opening and closing the valve provided inside the main muffler.
l
The valve is opened or closed by turning the DC motor in the normal or reverse direction.
l
The DC motor is driven in the normal or reverse direction by changing the direction of power flow
l
by the motor driving IC in the active exhaust control unit.
The active exhaust control module opens and closes the valve when it receives the signal produced
l
by the engine control unit.
HARNESS INSPECTION
On-Vehicle Inspection of MFI
Active
exhaust
control
unit
Engine control module connector
Measure the input voltaae of en-
aine control mddule.
Engine control module con-
l
nector: Disconnected
l Ignition switch: ON
Battery voltage
Engine control
module harness
side connector
ACTUATOR INSPECTION
Refer to GROUP 15.
DC motor for
valve drive
A Equipment side
connector
I
Repair the
harness