2001 INFINITI QX4 Factory Service Manual

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Page 817 of 2395

INFINITI QX4 2001 Factory Service Manual Diagnostic ProcedureNBEC0161 1 INSPECTION START 1. Turn ignition switch ªOFFº. 2. Loosen and retighten engine ground screws. SEF959Y 3. Check heated oxygen sensor 2 (rear) harness protector color. S

Page 818 of 2395

INFINITI QX4 2001 Factory Service Manual 2 CHECK HO2S2 (REAR) INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT 1. Check harness continuity between ECM terminal and HO2S2 terminal as follows. Refer to Wiring Diagram. MTBL0527 Continuity should exist.

Page 819 of 2395

INFINITI QX4 2001 Factory Service Manual 5 CHECK HEATED OXYGEN SENSOR 2 (REAR) With CONSULT-II 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. Sele

Page 820 of 2395

INFINITI QX4 2001 Factory Service Manual 7 CHECK HEATED OXYGEN SENSOR 2 (REAR)-II Idle vehicle for 10 minutes, then check voltage between the same terminals as in Test No. 6; or check voltage when coast- ing from 80 km/h (50 MPH) in ªDº po

Page 821 of 2395

INFINITI QX4 2001 Factory Service Manual DescriptionNBEC0162SYSTEM DESCRIPTIONNBEC0162S01 Sensor Input Signal to ECMECM func- tionActuator Crankshaft position sensor (POS) Engine speedHeated oxygen sensor 2 heater (rear) con- trolHeated oxyg

Page 822 of 2395

INFINITI QX4 2001 Factory Service Manual On Board Diagnosis LogicNBEC0165Malfunction is detected when the current amperage in the heated oxygen sensor 2 heater (rear) circuit is out of the normal range. [An improper voltage drop signal is se

Page 823 of 2395

INFINITI QX4 2001 Factory Service Manual because GST cannot display MODE 7 (1st trip DTC) con- cerning this diagnosis. Therefore, using CONSULT-II is recommended. DTC P0141, P0161 HEATED OXYGEN SENSOR 2 HEATER (REAR) (BANK 1)/ (BANK 2) DTC C

Page 824 of 2395

INFINITI QX4 2001 Factory Service Manual Wiring DiagramNBEC0167RIGHT BANKNBEC0167S01 MEC953C GI MA EM LC FE AT TF PD AX SU BR ST RS BT HA SC EL IDX DTC P0141, P0161 HEATED OXYGEN SENSOR 2 HEATER (REAR) (BANK 1)/ (BANK 2) Wiring Diagram EC-28
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