Infiniti Q45. Manual — part 417

DTC P0139, P0159 HO2S2

EC-307

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

NBS001V2

BANK 1

TBWM1226E

EC-308

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)

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:Aafter 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

DTC P0139, P0159 HO2S2

EC-309

C

D

E

F

G

H

I

J

K

L

M

A

EC

BANK 2

TBWM1227E

EC-310

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

NBS001V3

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten three ground screws on the body.
Refer to

EC-154, "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)

25

G

Heated oxygen sensor 2
heater (bank 2)

[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)

74

B

Heated oxygen sensor 2
(bank 2)

[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

PBIB2417E