Infiniti Q45. Manual - part 413

DTC P0138, P0158 HO2S2

EC-291

C

D

E

F

G

H

I

J

K

L

M

A

EC

6.

Check the voltage when revving 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 0.18V at least once during this
procedure.
If the voltage can be confirmed in step 6, step 7 is not nec-
essary.

7.

Keep vehicle at idling for 10 minutes, then check the voltage. Or
check the voltage when coasting from 80 km/h (50 MPH) in D
position.
The voltage should be below 0.18V at least once during this
procedure.

8.

If NG, go to 

EC-295, "Diagnostic Procedure"

 .

PBIB2024E

EC-292

DTC P0138, P0158 HO2S2

Wiring Diagram

NBS001UT

BANK 1

TBWM1226E

DTC P0138, P0158 HO2S2

EC-293

C

D

E

F

G

H

I

J

K

L

M

A

EC

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

6

GY

Heated oxygen sensor 2 
heater (bank 1)

[Engine is running]

●

Engine speed: Below 3,600 rpm after the 
following conditions are met

–

Engine: After warming up

–

Keeping the engine speed between 3,500 
and 4,000 rpm for 1 minute and at idle for 1 
minute under no load

0 - 1.0V

[Ignition switch: ON]

●

Engine stopped

[Engine is running]

●

Engine speed: Above 3,600 rpm

BATTERY VOLTAGE
(11 - 14V)

55

PU

Heated oxygen sensor 2 
(bank 1)

[Engine is running]

●

Revving engine from idle to 3,000 rpm 
quickly after the following conditions are met

–

Engine: After warming up

–

After keeping the engine speed between 
3,500 and 4,000 rpm for 1 minute and at idle 
for 1 minute under no load

0 - Approximately 1.0V

78

OR

Sensor ground
(Heated oxygen sensor 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

EC-294

DTC P0138, P0158 HO2S2

BANK 2

TBWM1227E