2001 INFINITI QX4 Factory Service Manual

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Page 681 of 2395

INFINITI QX4 2001 Factory Service Manual 9 CHECK ECM POWER SUPPLY CIRCUIT-II 1. Stop engine. 2. Check voltage between ECM terminal 67 and ground with CONSULT-II or tester. SEF293X OK or NG OK©GO TO 11. NG©GO TO 10. 10 DETECT MALFUNCTIONING

Page 682 of 2395

INFINITI QX4 2001 Factory Service Manual 12 CHECK ECM POWER SUPPLY CIRCUIT-IV 1. Disconnect ECM relay. SEF681UB 2. Check voltage between ECM relay terminal 7 and ground with CONSULT-II or tester. SEF957Y OK or NG OK©GO TO 14. NG©GO TO 13.

Page 683 of 2395

INFINITI QX4 2001 Factory Service Manual 15 DETECT MALFUNCTIONING PART Check the following. IHarness connectors E1, M1 IHarness connectors M94, F27 I10A fuse ©Repair harness or connectors. 16 CHECK HARNESS CONTINUITY BETWEEN ECM RELAY AND E

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INFINITI QX4 2001 Factory Service Manual 20 CHECK INTERMITTENT INCIDENT Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-140. ©INSPECTION ENDGI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX TROUBLE DIAGNOSIS FOR POWER SUPP

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INFINITI QX4 2001 Factory Service Manual SEF958Y Component DescriptionNBEC0050The mass air flow sensor is placed in the stream of intake air. It measures the intake flow rate by measuring a part of the entire intake flow. It consists of a ho

Page 686 of 2395

INFINITI QX4 2001 Factory Service Manual On Board Diagnosis LogicNBEC0053Malfunction is detected when (Malfunction A)an excessively high voltage from the sensor is sent to ECM when engine is not running, (Malfunction B)an excessively low vol

Page 687 of 2395

INFINITI QX4 2001 Factory Service Manual SEF058Y PROCEDURE FOR MALFUNCTION ANBEC0054S01With CONSULT-IINBEC0054S01011) Turn ignition switch ªONº. 2) Select ªDATA MONITORº mode with CONSULT-II. 3) Wait at least 6 seconds. 4) If 1st trip DT

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INFINITI QX4 2001 Factory Service Manual SEF243Y SEF175Y PROCEDURE FOR MALFUNCTION DNBEC0054S04CAUTION: Always drive vehicle at a safe speed. With CONSULT-IINBEC0054S04021) Turn ignition switch ªONº. 2) Start engine and warm it up to norma
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