INTAKE AND EXHAUST
Service Adiustment Procedures
Disconnect the hose (black) from the waste gate solenoid
valve, 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
(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:
Waste gate actuator malfunction
When pressure is low:
Waste gate actuator malfunction
Supercharging pressure leaks
Faulty turbocharger
SUPERCHARGING PRESSURE CONTROL SYS-
TEM INSPECTION (Turbo)
After the self-diagnosis code of MPI system is completely
read, turn off the ignition switch.
(2) Disconnect the hose (black) from the waste gate solenoid
valve and connect a three-way joint between the hose and
the solenoid.
(3) Conncet a hand vacuum pump to the three-way joint.
(4) Disconnect the hose (with its end painted red) from the
wastegate actuator control boost nipple and plug the nipple.
(5) Disconnect the battery negative cable from the battery
terminal for 10 seconds or more and connect it again.
(6) 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.
Engine
Hose
Normal state
state
(with its end painted red)
stop
Opened
Negative pressure leaks.
(Ignition
switch:
Closed by finger
Negative pressure is
maintained.
Idling
Closed by finger
Negative pressure leaks.
NOTE
If this check indicates an abnormal condition, the waste
gate actuator, waste gate solenoid valve or hose is broken.
TSB Revision
Содержание 3000GT 1991
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