2001 INFINITI QX4 Factory Service Manual

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Page 841 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0176 1 CHECK EXHAUST AIR LEAK 1. Start engine and run it at idle. 2. Listen for an exhaust air leak before three way catalyst. SEF099P OK or NG OK©GO TO 2. NG©Repair or repla

Page 842 of 2395

INFINITI QX4 2001 Factory Service Manual 4 CHECK FUEL PRESSURE 1. Release fuel pressure to zero. Refer to EC-39. 2. Install fuel pressure gauge and check fuel pressure. Refer to EC-39. At idling: When fuel pressure regulator valve vacuum hos

Page 843 of 2395

INFINITI QX4 2001 Factory Service Manual 7 CHECK FUNCTION OF INJECTORS With CONSULT-II 1. Start engine. 2. Perform ªPOWER BALANCEº in ªACTIVE TESTº mode with CONSULT-II. SEF070Y 3. Make sure that each circuit produces a momentary engine

Page 844 of 2395

INFINITI QX4 2001 Factory Service Manual SEF751UA Component DescriptionNBEC0177The fuel tank temperature sensor is used to detect the fuel tem- perature inside the fuel tank. The sensor modifies a voltage signal from the ECM. The modified si

Page 845 of 2395

INFINITI QX4 2001 Factory Service Manual DTC Confirmation ProcedureNBEC0179NOTE: If ªDTC Confirmation Procedureº has been previously conducted, always turn ignition switch ªOFFº and wait at least 10 seconds before conducting the next tes

Page 846 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0180 MEC957C GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0180 FUEL TANK TEMPERATURE SENSOR Wiring Diagram EC-311

Page 847 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0181 1 CHECK FUEL TANK TEMPERATURE SENSOR POWER SUPPLY CIRCUIT 1. Turn ignition switch ªOFFº. 2. Disconnect fuel level sensor unit and fuel pump harness connector. SEF751UA 3

Page 848 of 2395

INFINITI QX4 2001 Factory Service Manual 4 CHECK FUEL TANK TEMPERATURE SENSOR 1. Remove fuel level sensor unit. 2. Check resistance between fuel level sensor unit and fuel pump terminals 1 and 2 by heating with hot water or heat gun as shown
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