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Home >> Infiniti >> 2004 >> M45 >> Repair and Diagnosis >> Engine Performance >> Engine Control System >> DTC P1491: Vacuum Cut Valve Bypass Valve >> Overall Function Check >> With GST

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. 
  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.
    Fig 1: Manually Activating Vacuum Cut Valve Bypass Valve
    G00796535Courtesy of NISSAN MOTOR CO., U.S.A.
  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 .
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