Vacuum Control Valve Check

Disconnect the vacuum hose (white stripe) from the vacuum control valve and connect the hand vacuum pump to the vacuum control valve.

Fig 1: Connecting Hand Vacuum Pump To Vacuum Control Valve
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Plug the disconnected vacuum hose.
Start the engine and run at idle.
Check the vacuum condition.

Fig 2: Normal Vacuum Condition Table
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.