2001 INFINITI QX4 Factory Service Manual

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Page 769 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0121RIGHT BANKNBEC0121S01 MEC947C DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2) (HIGH VOLTAGE) Wiring Diagram EC-234

Page 770 of 2395

INFINITI QX4 2001 Factory Service Manual LEFT BANKNBEC0121S02 MEC948C GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0134, P0154 HEATED OXYGEN SENSOR 1 (FRONT) (BANK 1)/(BANK 2) (HIGH VOLTAGE) Wiring Diagram (Contd) EC-235

Page 771 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0122 1 INSPECTION START 1. Turn ignition switch ªOFFº. 2. Check heated oxygen sensor 1 (front) harness protector color. SEF505Y 3. Disconnect corresponding heated oxygen sens

Page 772 of 2395

INFINITI QX4 2001 Factory Service Manual 3 CHECK HO2S1 (FRONT) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Disconnect ECM harness connector. 2. Check harness continuity between ECM terminal and HO2S1 terminal as follows. Refer to Wiring Diagr

Page 773 of 2395

INFINITI QX4 2001 Factory Service Manual 5 CHECK HEATED OXYGEN SENSOR 1 (FRONT) With CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Select ªMANU TRIGº and adjust ªTRIGGER POINTº to 100% in ªDATA MONITORº

Page 774 of 2395

INFINITI QX4 2001 Factory Service Manual 6 CHECK HEATED OXYGEN SENSOR 1 (FRONT) Without CONSULT-II 1. Start engine and warm it up to normal operating temperature. 2. Set voltmeter probes between ECM terminal 63 (HO2S1 bank 1 right signal) or

Page 775 of 2395

INFINITI QX4 2001 Factory Service Manual DescriptionNBEC0123SYSTEM DESCRIPTIONNBEC0123S01 Sensor Input Signal to ECMECM func- tionActuator Crankshaft position sensor (POS) Engine speedHeated oxygen sensor 1 heater (front) con- trolHeated oxy

Page 776 of 2395

INFINITI QX4 2001 Factory Service Manual On Board Diagnosis LogicNBEC0126Malfunction is detected when the current amperage in the heated oxygen sensor 1 heater (front) circuit is out of the normal range. [An improper voltage drop signal is s
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