Nissan Frontier D22. Instruction — part 401

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

EC-707

[VG33E]

C

D

E

F

G

H

I

J

K

L

M

A

EC

BANK 2

BBWA1078E

EC-708

[VG33E]

DTC P0031, P0032, P0051, P0052 HO2S1 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 the ECM terminals, such as the ground.

Diagnostic Procedure

UBS00DFR

1.

CHECK HO2S1 POWER SUPPLY CIRCUIT

1.

Turn ignition switch OFF.

2.

Check heated oxygen sensor 1 harness protector.

3.

Disconnect corresponding heated oxygen sensor 1 harness
connector.

4.

Turn ignition switch ON.

5.

Check voltage between HO2S1 terminal 1 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)

121

BR

Heated oxygen sensor 1
heater (bank 2)

[Engine is running]

●

Engine speed is below 2,800 rpm

Approximately 0.4V

[Engine is running]

●

Engine speed is above 2,800 rpm

BATTERY VOLTAGE
(11 - 14V)

PBIB0636E

BBIA0188E

Voltage: Battery voltage

SEF633W

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

EC-709

[VG33E]

C

D

E

F

G

H

I

J

K

L

M

A

EC

2.

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M59, F27

●

Fuse block (J/B) connector M26

●

10A fuse

●

Harness for open or short between heated oxygen sensor 1 and fuse

>> Repair harness or connectors.

3.

CHECK HO2S1 HEATER OUTPUT CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal and HO2S1 terminal as follows.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 4.

NG

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

4.

CHECK HEATED OXYGEN SENSOR 1 HEATER

Refer to

EC-709, "Component Inspection"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace malfunctioning heated oxygen sensor 1.

5.

CHECK INTERMITTENT INCIDENT

Refer to

EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

.

>> INSPECTION END

Component Inspection

UBS00DFS

HEATED OXYGEN SENSOR 1 HEATER

1.

Check resistance between HO2S1 terminals 3 and 1.

2.

Check continuity between HO2S1 terminals 2 and 1, 3 and 2.

3.

If NG, replace heated oxygen sensor 1.

CAUTION:

●

Discard any heated oxygen sensor which has been dropped
from a height of more than 0.5 m (19.7 in) onto a hard sur-
face such as a concrete floor; use a new one.

DTC

Terminals

Bank

ECM

Sensor

P0031

119

3

Bank 1

P0051

121

3

Bank 2

Continuity should exist.

Resistance: 2.3 - 4.3

Ω at 25°C (77°F)

Continuity should not exist.

AEC158A

EC-710

[VG33E]

DTC P0031, P0032, P0051, P0052 HO2S1 HEATER

●

Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

Removal and Installation

UBS00DFT

HEATED OXYGEN SENSOR 1

Refer to

EM-80, "OUTER COMPONENT PARTS"

.