Infiniti M35/M45 Y50. Manual — part 605

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-893

[VK45DE]

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

R/L

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

L/R

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

–

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

B

Sensor ground
(Heated oxygen sensor 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

EC-894

[VK45DE]

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

BANK 2

TBWT1015E

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

EC-895

[VK45DE]

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.

Diagnostic Procedure

NBS005BU

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screws on the body.
Refer to

EC-864, "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

P/B

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

W

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

–

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

B

Sensor ground
(Heated oxygen sensor 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

1.

Body ground M70

2.

Body ground M16

PBIB2782E

EC-896

[VK45DE]

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

2.

CHECK HO2S2 HEATER POWER SUPPLY CIRCUIT

1.

Disconnect heated oxygen sensor 2 harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between HO2S2 terminal 2 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E12, F3

●

IPDM E/R connector E7

●

15A fuse

●

Harness for open or short between heated oxygen sensor 2 and fuse

>> Repair open circuit or short to ground or short to power in harness or connectors.

1.

Air fuel ratio (A/F) sensor 1 (bank 1)

2.

Heated oxygen sensor 2 (bank 1)

3.

Heated oxygen sensor 2 (bank 1)
harness connector

4.

Heated oxygen sensor 2 (bank 2)
harness connector

5.

Heated oxygen sensor 2 (bank 2)

6.

Air fuel ratio (A/F) sensor 1 (bank 2)

Voltage: Battery voltage

PBIB2711E

PBIB0969E