2001 INFINITI QX4 Factory Service Manual

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Page 1105 of 2395

INFINITI QX4 2001 Factory Service Manual 15 CHECK THROTTLE POSITION SWITCH With CONSULT-II 1. Install all removed parts. 2. Start engine and warm it up to normal operating temperature. 3. Turn ignition switch ªOFFº. 4. Remove vacuum hose c

Page 1106 of 2395

INFINITI QX4 2001 Factory Service Manual 16 CHECK THROTTLE POSITION SWITCH 1. Install all removed parts. 2. Start engine and warm it up to normal operating temperature. 3. Turn ignition switch ªOFFº. 4. Remove vacuum hose connected to thro

Page 1107 of 2395

INFINITI QX4 2001 Factory Service Manual 18 CHECK EVAP PURGE LINE Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks. Refer to ªEVAPORATIVE EMISSION LINE DRAWINGº, EC-36. OK or NG OK©GO TO 19. NG©Replace it. 19 C

Page 1108 of 2395

INFINITI QX4 2001 Factory Service Manual SEF032W SEF143S Component DescriptionNBEC0338NOTE: If DTC P1448 is displayed with P0440, perform trouble diagno- sis for DTC P1448 first. The EVAP canister vent control valve is located on the EVAP ca

Page 1109 of 2395

INFINITI QX4 2001 Factory Service Manual Possible CauseNBEC0591IEVAP canister vent control valve IEVAP control system pressure sensor and circuit IBlocked rubber tube to EVAP canister vent control valve IWater separator IEVAP canister is sat

Page 1110 of 2395

INFINITI QX4 2001 Factory Service Manual SEF013Z 11) Make sure the following. Condition VENT CONTROL/VAir passage continuity betweenAandB ON No OFF Yes If the result is NG, go to ªDiagnostic Procedureº, EC-577. If the result is OK, go to

Page 1111 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0344 MEC963C DTC P1448 EVAPORATIVE EMISSION (EVAP) CANISTER VENT CONTROL VALVE (OPEN) Wiring Diagram EC-576

Page 1112 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0345 1 CHECK RUBBER TUBE 1. Turn ignition switch ªOFFº. 2. Disconnect rubber tube connected to EVAP canister vent control valve. 3. Check the rubber tube for clogging. SEF143
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