User Manual - Page 544

For 2001 XTERRA.

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7 CHECK VACUUM CUT VALVE
Check vacuum cut valve as follows:
SEF186S
SEF379Q
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.
OK or NG
OK 䊳 GO TO 8.
NG 䊳 Replace vacuum cut valve.
8 CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR HOSE
1. Turn ignition switch OFF.
2. Check disconnection or improper connection of hose connected to EVAP control system pressure sensor.
OK or NG
OK 䊳 GO TO 9.
NG 䊳 Repair it
DTC P1491 VACUUM CUT VALVE BYPASS VALVE
KA24DE
Diagnostic Procedure (Cont’d)
EC-544
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