Check Valve Operation Check

WARNING: This page is about a different car, the 2009 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.

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

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

VACUUM PUMP CONNECTION REFERENCE

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

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.