Infiniti QX4 (R50). Manual — part 203

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 possible.)
The voltage should be below 1.4V during this procedure.

5)

If NG, go to “Diagnostic Procedure”, EC-282.

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

DTC P0140, P0160 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2)

(HIGH VOLTAGE)

Overall Function Check (Cont’d)

EC-279

Wiring Diagram

NBEC0160

RIGHT BANK

NBEC0160S01

MEC951C

DTC P0140, P0160 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2)

(HIGH VOLTAGE)

Wiring Diagram

EC-280

LEFT BANK

NBEC0160S02

MEC952C

GI

MA

EM

LC

FE

AT

TF

PD

AX

SU

BR

ST

RS

BT

HA

SC

EL

IDX

DTC P0140, P0160 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2)

(HIGH VOLTAGE)

Wiring Diagram (Cont’d)

EC-281

Diagnostic Procedure

NBEC0161

1

INSPECTION START

1. Turn ignition switch “OFF”.
2. Loosen and retighten engine ground screws.

SEF959Y

3. Check heated oxygen sensor 2 (rear) harness protector color.

SEF372Z

4. Disconnect corresponding heated oxygen sensor 2 (rear) harness connector.

SEF971Y

5. Disconnect ECM harness connector.

©

GO TO 2.

DTC P0140, P0160 HEATED OXYGEN SENSOR 2 (REAR) (BANK 1)/(BANK 2)

(HIGH VOLTAGE)

Diagnostic Procedure

EC-282