Infiniti F50. Manual - part 381

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-165

C

D

E

F

G

H

I

J

K

L

M

A

EC

Wiring Diagram

EBS00LX8

BANK 1

TBWM0149E

EC-166

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

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)

10

GY

Heated oxygen sensor 2 
heater (bank 1)

[Engine is running]

●

Engine speed is 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 is above 3,600 rpm.

BATTERY VOLTAGE
(11 - 14V)

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-167

C

D

E

F

G

H

I

J

K

L

M

A

EC

BANK 2

TBWM0150E

EC-168

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

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

EBS00LX9

1. 

CHECK HO2S2 POWER SUPPLY CIRCUIT

1.

Turn ignition switch “OFF”.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

Turn ignition switch “ON”.

4.

Check voltage between HO2S2 terminal 3 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 3.

NG

>> GO TO 2.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

11

G

Heated oxygen sensor 2 
heater (bank 2)

[Engine is running]

●

Engine speed is 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 is above 3,600 rpm.

BATTERY VOLTAGE
(11 - 14V)

Voltage: Battery voltage

PBIB0018E

PBIB0112E