2001 INFINITI QX4 Factory Service Manual

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Page 1025 of 2395

INFINITI QX4 2001 Factory Service Manual 10 CHECK CAMSHAFT Check accumulation of debris to the signal pick-up portion of the camshaft. Refer to step 35 of ªTiming chain removalº, EM-23. OK or NG OK©GO TO 11. NG©Remove debris and clean th

Page 1026 of 2395

INFINITI QX4 2001 Factory Service Manual On Board Diagnosis LogicNBEC0282HThe closed loop control has the one trip detection logic. Malfunction is detected when the closed loop control function for right bank does not operate even when vehic

Page 1027 of 2395

INFINITI QX4 2001 Factory Service Manual If the check result is OK, perform the following step. 4) Let engine idle at least 5 minutes. 5) Maintain the following condition at least 50 consecutive sec- onds. B/FUEL SCHDL 3.6 msec or more ENG S

Page 1028 of 2395

INFINITI QX4 2001 Factory Service Manual SEF999Y Component DescriptionNBEC0532The swirl control valve control vacuum check switch detects vacuum signal to the swirl control valve, and sends ªONº or ªOFFº signal to the ECM. When vacuum is

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INFINITI QX4 2001 Factory Service Manual On Board Diagnosis LogicNBEC0535Malfunction is detected when the swirl control valve control vacuum check switch remains ªOFFº under specified engine conditions. Possible CauseNBEC0536IHarness or co

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INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0538 MEC981C GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P1165 SWIRL CONTROL VALVE CONTROL VACUUM CHECK SWITCH Wiring Diagram EC-495

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INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0539 1 CHECK HOSES 1. Turn ignition switch ªOFFº. 2. Check hose for clogging or improper connection. SEF109L OK or NG OK©GO TO 2. NG©Repair or reconnect the hose. 2 CHECK S

Page 1032 of 2395

INFINITI QX4 2001 Factory Service Manual 4 CHECK SWIRL CONTROL VALVE CONTROL VACUUM CHECK SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal 55 and swirl contr
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