Overall Function Check

Use this procedure to check the overall function of vacuum cut valve bypass valve. During this check, the 1st trip DTC might not be confirmed.

WITH GST 

1. Remove vacuum cut valve and vacuum cut valve bypass valve as an assembly.
2. Apply vacuum to port A  and check that there is no suction from port B  .
Fig 1: Identifying Vacuum Cut Valve Bypass Valve Ports
Courtesy of NISSAN MOTOR CO., U.S.A.
3. Apply vacuum to port B  and check that there is suction from port A. 
4. Blow air in port B  and check that there is a resistance to flow out of port A. 
5. Supply battery voltage to the terminal.
6. Blow air in port A  and check that air flows freely out of port B. 
7. Blow air in port B  and check that air flows freely out of port A. 
8. If NG, go to DIAGNOSTIC PROCEDURE  .