Frontier XE King Cab 2WD L4-2.4L (KA24DE) (2000)
Vacuum cut valve
Check vacuum cut valve as follows:
1. Plug port [C] and [D] with fingers.
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. Open port [C] and [D].
6. Blow air in port [A] check that air flows freely out of port [C].
7. Blow air in port [B] check that air flows freely out of port [D].
If NG, replace vacuum cut valve.