Intake Charge Pressure Control System Inspection; Turbocharger Supercharging Pressure Inspection - Mitsubishi 1989-1993 GALANT Service Manual

INTAKE AND EXHAUST -
Turbocharger waste
gate actuator
TSB Revision
Adjustment Procedures
Service
SUPERCHARGING PRESSURE
TURBOCHARGER
INSPECTION
Caution
Perform running inspection with two passengers in tha
made.
The pressure gauge reading is taken by a front seat
passenger.
(1) Disconnect the supercharging pressure control hose at the
solenoid valve (fixed to the air cleaner), and plug the nipple.
Attach the pressure gauge to the hose.
to a speed of more than 3,500 rpm at 2nd gear. Measure
the supercharging pressure when the pointer is stabilized.
Standard value: 31-70 kPa (4.4-10.1 psi)
Caution
If the supercharging pressure deviates from the standard
value, check the following items for possible causes.
When pressure is high:
Turbocharger waste gate actuator malfunction
When pressure is low:
Turbocharger waste gate actuator malfunction
Supercharging pressure leaks
Faulty turbocharger
SYSTEM INSPECTION
(1) Disconnect the vacuum hose (white-striped) from the tur-
bocharger waste gate actuator, and connect the hand va-
cuum pump to the vacuum hose.
(2) Disconnect the vacuum hose (black) from the boost nipple
which controls the turbocharger waste gate actuator.
(3) Insert the blind plug into the nipple from which the
vacuum hose was disconnected.
(4) Keep the (-) terminal of the battery disconnected for 10
seconds or longer, and then reconnect the terminal.
(5) Close and open the vacuum hose (black) end with your
finger, and apply negative pressure to check the negative
pressure state.
Engine state Hose (black)
stop Opened
(Ignition
switch: ON)
Idling
NOTE
If negative pressure is not normal, it can be assumed that
there is a malfunction in the turbocharger waste gate sole-
noid or vacuum hose.
Normal state
Negative pressure
leaks.
Negative pressure is
maintained.
Negative pressure
leaks.