2001 INFINITI QX4 Factory Service Manual

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Page 793 of 2395

INFINITI QX4 2001 Factory Service Manual Possible CauseNBEC0439IHarness or connectors (The sensor circuit is open or shorted.) IHeated oxygen sensor 2 (rear) IFuel pressure IInjectors IIntake air leaks SEF663Y SEF664Y SEF665Y DTC Confirmatio

Page 794 of 2395

INFINITI QX4 2001 Factory Service Manual 1 right signal) or 71 (HO2S2 bank 2 left signal) and engine ground. 4) Check the voltage when racing up to 4,000 rpm under no load at least 10 times. (Depress and release accelerator pedal as soon as

Page 795 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring Diagram=NBEC0144RIGHT BANKNBEC0144S01 MEC951C DTC P0138, P0158 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2) (MAX. VOLTAGE MONITORING) Wiring Diagram EC-260

Page 796 of 2395

INFINITI QX4 2001 Factory Service Manual LEFT BANKNBEC0144S02 MEC952C GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0138, P0158 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2) (MAX. VOLTAGE MONITORING) Wiring Diagram (Contd) E

Page 797 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0145 1 RETIGHTEN GROUND SCREWS 1. Turn ignition switch ªOFFº. 2. Loosen and retighten engine ground screws. SEF959Y ©GO TO 2. 2 CLEAR THE SELF-LEARNING DATA With CONSULT-II

Page 798 of 2395

INFINITI QX4 2001 Factory Service Manual 3 CHECK HO2S2 (REAR) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Turn ignition switch ªOFFº. 2. Check heated oxygen sensor 2 (rear) harness protector color. SEF372Z 3. Disconnect corresponding heated

Page 799 of 2395

INFINITI QX4 2001 Factory Service Manual 4 CHECK HO2S2 (REAR) GROUND CIRCUIT FOR OPEN AND SHORT 1. Check harness continuity between HO2S2 terminal 4 and engine ground. Refer to Wiring Diagram. Continuity should exist. 2. Also check harness f

Page 800 of 2395

INFINITI QX4 2001 Factory Service Manual 6 CHECK HEATED OXYGEN SENSOR 2 (REAR)-I Without CONSULT 1. Start engine and drive vehicle at a speed of more than 70 km/h (43 MPH) for 2 consecutive minutes. 2. Stop vehicle with engine running. 3. Se
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