Infiniti M45 (Y34). Manual - part 392

DTC P0139, P0159 HO2S2

EC-257

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

ABS002HQ

BANK 1

TBWA0276E

EC-258

DTC P0139, P0159 HO2S2

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)

123

PU

Heated oxygen sensor 2 
(bank 1)

[Engine is running]

●

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

–

Warm-up condition

–

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

DTC P0139, P0159 HO2S2

EC-259

C

D

E

F

G

H

I

J

K

L

M

A

EC

BANK 2

TBWA0277E

EC-260

DTC P0139, P0159 HO2S2

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.

Diagnostic Procedure

ABS002HR

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws. 
Refer to 

EC-141, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

124

B

Heated oxygen sensor 2 
(bank 2)

[Engine is running]

●

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

–

Warm-up condition

–

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

PBIB1118E