Check Valve Operation Check

WARNING: This page is about a different variant/trim than selected.

Remove the check valve (Refer to REMOVAL AND INSTALLATION < EXCEPT RALLIART > < Except RALLIART > or REMOVAL AND INSTALLATION < RALLIART > < RALLIART >).
CAUTION: Replace the check valve when it is faulty.

Using a vacuum pump, check operation of the check valve.

CHECK VALVE OPERATION

Vacuum pump connection	Normal condition
When connected to the booster side (1)	Vacuum is generated and maintained.
When connected to the engine side (2)	No vacuum is generated.

Fig 1: Checking Check Valve Operation Using Vacuum Pump

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.