2001 INFINITI QX4 Factory Service Manual

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Page 961 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0255 1 CHECK IACV-AAC VALVE POWER SUPPLY CIRCUIT 1. Stop engine. 2. Disconnect IACV-AAC valve harness connector. SEF994Y 3. Turn ignition switch ªONº. 4. Check voltage betwee

Page 962 of 2395

INFINITI QX4 2001 Factory Service Manual 3 CHECK IACV-AAC VALVE OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch ªOFFº. 2. Disconnect ECM harness connector. 3. Check harness continuity between ECM terminals and IACV-AAC val

Page 963 of 2395

INFINITI QX4 2001 Factory Service Manual 6 CHECK AIR CONTROL VALVE (POWER STEERING) OPERATION-II Check vacuum hose for vacuum existence when steering wheel is turned. SEF995Y Vacuum should exist. OK or NG OK©GO TO 9. NG©GO TO 7. 7 CHECK VA

Page 964 of 2395

INFINITI QX4 2001 Factory Service Manual 8 CHECK VACUUM HOSES AND TUBES 1. Disconnect vacuum hoses between air control valve (Power steering) and vacuum port, air control valve (Power steer- ing) and intake air duct. 2. Check the hoses and t

Page 965 of 2395

INFINITI QX4 2001 Factory Service Manual 10 CHECK IACV-AAC VALVE-II 1. Reconnect IACV-AAC valve harness connector and ECM harness connector. 2. Turn ignition switch ªONº and ªOFFº, and ensure the IACV-AAC valve makes operating sound acco

Page 966 of 2395

INFINITI QX4 2001 Factory Service Manual SEF505V Component DescriptionNBEC0256A closed throttle position switch and wide open throttle position switch are built into the throttle position sensor unit. The wide open throttle position switch i

Page 967 of 2395

INFINITI QX4 2001 Factory Service Manual SEF197Y SEF198Y DTC Confirmation ProcedureNBEC0260CAUTION: Always drive vehicle at a safe speed. NOTE: If ªDTC Confirmation Procedureº has been previously conducted, always turn ignition switch ªOF

Page 968 of 2395

INFINITI QX4 2001 Factory Service Manual At 2,000 rpm: Approximately 0V 3) If NG, go to ªDiagnostic Procedureº, EC-435. GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0510 CLOSED THROTTLE POSITION SWITCH Overall Function Check
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