2001 INFINITI QX4 Factory Service Manual

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Page 721 of 2395

INFINITI QX4 2001 Factory Service Manual 15 CHECK FUEL INJECTOR 1. Disconnect injector harness connector. 2. Check resistance between terminals as shown in the figure. SEF964XC OK or NG OK©GO TO 16. NG©Replace fuel injector. 16 CHECK INTER

Page 722 of 2395

INFINITI QX4 2001 Factory Service Manual DescriptionNBEC0081NOTE: If DTC P0125 is displayed with P0115, first perform the trouble diagnosis for DTC P0115. Refer to EC-169. SEF594K COMPONENT DESCRIPTIONNBEC0081S01The engine coolant temperatur

Page 723 of 2395

INFINITI QX4 2001 Factory Service Manual Possible CauseNBEC0431IHarness or connectors (High resistance in the circuit) IEngine coolant temperature sensor IThermostat SEF174Y DTC Confirmation ProcedureNBEC0083CAUTION: Be careful not to overhe

Page 724 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0084 MEC945C GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0125 ENGINE COOLANT TEMPERATURE SENSOR (ECTS) Wiring Diagram EC-189

Page 725 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0085 1 CHECK ECTS POWER SUPPLY CIRCUIT 1. Turn ignition switch ªOFFº. 2. Disconnect engine coolant temperature sensor harness connector F112, F28. SEF370Z 3. Turn ignition sw

Page 726 of 2395

INFINITI QX4 2001 Factory Service Manual 4 DETECT MALFUNCTIONING PART Check the following. IHarness connectors F112, F28 IHarness for open between ECM and engine coolant temperature sensor IHarness for open between TCM (Transmission Control

Page 727 of 2395

INFINITI QX4 2001 Factory Service Manual SEF463R SEF288D Component DescriptionNBEC0086The heated oxygen sensor 1 (front) is placed into the front tube. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heate

Page 728 of 2395

INFINITI QX4 2001 Factory Service Manual TERMI- NAL NO.WIRE COLORITEM CONDITION DATA (DC Voltage) 62 G/BHeated oxygen sensor 1 (front) (bank 2)[Engine is running] IWarm-up condition IEngine speed is 2,000 rpm.0 - Approximately 1.0V (Peri- od
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