2001 INFINITI QX4 Factory Service Manual

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Page 913 of 2395

INFINITI QX4 2001 Factory Service Manual 3 CHECK EVAP CANISTER VENT CONTROL VALVE POWER SUPPLY CIRCUIT 1. Turn ignition switch ªOFFº. 2. Disconnect EVAP canister vent control valve harness connector. SEF143S 3. Turn ignition switch ªONº.

Page 914 of 2395

INFINITI QX4 2001 Factory Service Manual 6 DETECT MALFUNCTIONING PART Check the following. IHarness connectors B101, B43 IHarness connectors B1, M2 and M94, F27 IHarness for open or short between EVAP canister vent control valve and ECM ©Re

Page 915 of 2395

INFINITI QX4 2001 Factory Service Manual 9 CHECK EVAP CANISTER VENT CONTROL VALVE-II With CONSULT-II 1. Reconnect harness connectors disconnected. 2. Turn ignition switch ªONº. 3. Perform ªVENT CONTROL/Vº in ªACTIVE TESTº mode. 4. Chec

Page 916 of 2395

INFINITI QX4 2001 Factory Service Manual SEF053V SEF954S Component DescriptionNBEC0235The EVAP control system pressure sensor detects pressure in the purge line. The sensor output voltage to the ECM increases as pressure increases. The EVAP

Page 917 of 2395

INFINITI QX4 2001 Factory Service Manual On Board Diagnosis LogicNBEC0238Malfunction is detected when an improper voltage signal from EVAP control system pressure sensor is sent to ECM. Possible CauseNBEC0513IHarness or connectors (The EVAP

Page 918 of 2395

INFINITI QX4 2001 Factory Service Manual SEF194Y SEF340X WITH CONSULT-IINBEC0239S011) Start engine and warm it up to normal operating temperature. 2) Turn ignition switch ªOFFº and wait at least 10 seconds. 3) Turn ignition switch ªONº.

Page 919 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0240 MEC964C DTC P0450 EVAPORATIVE EMISSION (EVAP) CONTROL SYSTEM PRESSURE SENSOR Wiring Diagram EC-384

Page 920 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0241 1 CHECK RUBBER TUBE 1. Turn ignition switch ªOFFº. 2. Check rubber tube connected to the EVAP control system pressure sensor for clogging, vent, kink, disconnection or i
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