2001 INFINITI QX4 Ac system

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Page 1102 of 2395

INFINITI QX4 2001  Factory Service Manual 7 CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE
With CONSULT-II
Check air passage continuity of EVAP canister purge volume control solenoid valve under the following conditions.
SEF334X
With

Page 1103 of 2395

INFINITI QX4 2001  Factory Service Manual 9 CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR
1. Disconnect EVAP control system pressure sensor harness connector.
SEF495R
2. Check connectors for water.
Water should not exist.
OK or NG
OK©G

Page 1104 of 2395

INFINITI QX4 2001  Factory Service Manual 13 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. Che

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