Check Valve Operation Check

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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	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 Valve Operation

Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.