2001 INFINITI QX4 Factory Service Manual

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Page 1129 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0359 MEC972C DTC P1491 VACUUM CUT VALVE BYPASS VALVE Wiring Diagram EC-594

Page 1130 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0360 1 INSPECTION START Do you have CONSULT-II? YesorNo Ye s©GO TO 2. No©GO TO 3. 2 CHECK VACUUM CUT VALVE BYPASS VALVE OPERATION With CONSULT-II 1. Turn ignition switch ªOF

Page 1131 of 2395

INFINITI QX4 2001 Factory Service Manual 3 CHECK VACUUM CUT VALVE BYPASS VALVE OPERATION Without CONSULT-II 1. Turn ignition switch ªOFFº. 2. Remove vacuum cut valve and vacuum cut valve bypass valve as an assembly. 3. Apply vacuum to port

Page 1132 of 2395

INFINITI QX4 2001 Factory Service Manual 6 CHECK EVAP CANISTER 1. Pinch the fresh air hose. 2. Blow air into portAand check that it flows freely out of portB. AEC630A OK or NG OK©GO TO 12. NG©Replace EVAP canister. 7 CHECK BYPASS HOSE Chec

Page 1133 of 2395

INFINITI QX4 2001 Factory Service Manual 8 CHECK VACUUM CUT VALVE BYPASS VALVE With CONSULT-II 1. Perform ªVC/V BYPASS/Vº in ªACTIVE TESTº mode. 2. Check air passage continuity and operation delay time under the following conditions. SEF

Page 1134 of 2395

INFINITI QX4 2001 Factory Service Manual 9 CHECK VACUUM CUT VALVE Check vacuum cut valve as follows: SEF379Q a. Plug portCandDwith fingers. b. Apply vacuum to portAand check that there is no suction from portB. c. Apply vacuum to portBand ch

Page 1135 of 2395

INFINITI QX4 2001 Factory Service Manual 12 CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR 1. Remove EVAP control system pressure sensor with its harness connector connected. CAUTION: INever apply force to the air hole protector of the sensor if

Page 1136 of 2395

INFINITI QX4 2001 Factory Service Manual 14 CHECK EVAP CANISTER VENT CONTROL VALVE-I 1. Remove EVAP canister vent control valve from EVAP canister. 2. Check portionBof EVAP canister vent control valve for being rusted. SEF337X OK or NG OK©G
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