Intake Charge Pressure Control System Check: Notes

After the diagnostic trouble code of MFI system is completely read, turn off the ignition switch.
Disconnect the hose (black) from the turbocharger wastegate actuator control boost nipple at the air outlet fitting and plug this nipple.
Connect a hand vacuum pump to the hose (black).
Use the vacuum pump to apply negative pressure, and check the negative pressure condition while the engine is stopped and while it is idling.

Fig 1: Engine Various State Reference Table
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 2: Checking Intake Charge Pressure Control System
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

NOTE: If this check indicates an abnormal condition; the turbocharger wastegate solenoid, the turbocharger wastegate actuator or the hose is broken.

Connect a hand vacuum pump to the solenoid valve nipple A.
Use a jumper wire to connect between the solenoid valve terminal and battery terminal.
Connect and disconnect the jumper wire at the battery negative terminal to apply negative pressure and check tightness.

Fig 3: Turbocharger Wastegate Solenoid Check Reference Table
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.

Fig 4: Checking Turbocharger Wastegate Solenoid
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.