Mitsubishi 3000GT Service Manual page 425

INTAKE AND EXHAUST
Disconnect the hose (black) from the turbocharger waste
(1)
gate solenoid, and connect the pressure gauge to the
hose. Plug the nipple of the solenoid valve from which
the hose (black) has been disconnected.
(2) Drive the vehicle with full throttle and accelerate the engine
to a speed of more than 3,500 rpm at 2nd gear. Measure
the supercharging pressure when the pointer is stabilized.
Standard value: 20-60 kPa (2.9-8.7 psi)
Caution
If the supercharging pressure deviates from the stan-
dard value, check the following items for possible
causes.
When pressure is high:
When pressure is low:
INTAKE CHARGE PRESSURE CONTROL
SYSTEM CHECK (Turbo)
After the diagnostic trouble code of MFI system is com-
(1)
pletely read, turn off the ignition switch.
(2) Disconnect the hose (black) from the turbocharger waste
gate solenoid and connect a three-way joint between
the hose and the solenoid.
(3) Connect a hand vacuum pump to the three-way joint.
(4) Disconnect the hose (with its end painted red) from the
turbocharger wastegate actuator control boost nipple and
plug the nipple.
(5) Applying a negative pressure with the hand vacuum pump,
check tightness both when the hose end (with its end
painted red) is closed and when it is open.
NOTE
If this check indicates an abnormal condition, the turbo-
charger waste gate actuator, turbocharger waste gate
solenoid or hose is broken.
TSB Revision
Turbocharger waste gate actuator malfunction
Turbocharger waste gate actuator malfunction
Supercharging pressure leaks
Faulty turbocharger
Engine
Hose (with its end
state
painted red)
stop Opened
(Ignition
switch:
Closed by finger
Idling
Closed by finger
(after
warm-up)
15-7
Normal state
I
Negative pressure
leaks.
Negative pressure is
maintained.
Negative pressure
leaks.