Nissan Frontier D22. Manual - part 426

DTC P0138, P0158 HO2S2

EC-807

[VG33E]

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2. 

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between ECM terminal and HO2S2 terminal as follows.
Refer to Wiring Diagram.

2.

Check harness continuity between ECM terminal or HO2S2 terminal and ground as follows.

Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 3.

NG

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

3. 

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Check harness continuity between HO2S2 terminal 4 and engine ground.
Refer to Wiring Diagram.

2.

Also check harness for short to power.

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness for open between heated oxygen sensor 2 and engine ground.

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

5. 

CHECK HO2S2 CONNECTORS FOR WATER

Check heated oxygen sensor 2 connector and harness connector for water.
Water should not exist.

OK or NG

OK (With CONSULT-II)>>GO TO 6.
OK (Without CONSULT-II)>>GO TO 7.
NG

>> Repair or replace harness or connectors.

DTC

Terminals

Bank

ECM

Sensor

P0138

56

1

Bank 1 

P0158

57

1

Bank 2

Continuity should exist.

DTC

Terminals

Bank

ECM or sensor

Ground

P0138

56 or 1

Ground

Bank 1 

P0158

57 or 1

Ground

Bank 2

Continuity should not exist.

Continuity should exist.

EC-808

[VG33E]

DTC P0138, P0158 HO2S2

6. 

CHECK HEATED OXYGEN SENSOR 2

 With CONSULT-II

1.

Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-II.

2.

Start engine and warm it up to the normal operating temperate.

3.

Turn ignition switch OFF and wait at least 10 seconds.

4.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

5.

Let engine idle for 1 minute.

6.

Select “FUEL INJECTION” in “ACTIVE TEST” mode, and select
“HO2S2 (B1)/(B2)” as the monitor item with CONSULT-II.

7.

Check “HO2S2 (B1)/(B2)” at idle speed when adjusting “FUEL INJECTION” to 

±25%.

“HO2S2 (B1)/(B2)” should be above 0.62V at least once when the “FUEL INJECTION” is +25%.
“HO2S2 (B1)/(B2)” should be below 0.48V at least once when the “FUEL INJECTION” is 

−25%.

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 surface such as a concrete floor; use a new one.

●

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.

OK or NG

OK

>> GO TO 8.

NG

>> Replace malfunctioning heated oxygen sensor 2.

SEF662Y

SEF989RD

DTC P0138, P0158 HO2S2

EC-809

[VG33E]

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7. 

CHECK HEATED OXYGEN SENSOR 2

 Without CONSULT-II

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Stop vehicle with engine running.

3.

Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.

4.

Let engine idle for 1 minute.

5.

Set voltmeter probes between ECM terminal 56 [HO2S2 (B1)
signal] or 57 [HO2S2 (B2) signal] and engine ground.

6.

Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possible.)
The voltage should be above 0.62V at least once during this
procedure.
If the voltage is above 0.62V at step 6, step 7 is not neces-
sary.

7.

Keep vehicle at idling for 10 minutes, then check voltage. Or
check the voltage when coasting from 80 km/h (50 MPH) in D
position with “OD” OFF (A/T), 3rd gear position (M/T).
The voltage should be below 0.48V at least once during this procedure.

8.

If NG, replace heated oxygen sensor 2.

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 surface such as a concrete floor; use a new one.

●

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.

OK or NG

OK

>> GO TO 8.

NG

>> Replace malfunctioning heated oxygen sensor 2.

8. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-696, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END.

Removal and Installation

UBS00DIH

HEATED OXYGEN SENSOR 2

Refer to 

EX-3, "EXHAUST SYSTEM"

 .

SEF922UA

EC-810

[VG33E]

DTC P0139, P0159 HO2S2

DTC P0139, P0159 HO2S2

PFP:226A0

Component Description

UBS00DII

The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the heated oxygen sensor 1 are
shifted, the air-fuel ratio is controlled to stoichiometric, by the signal
from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.

CONSULT-II Reference Value in Data Monitor Mode

UBS00DIJ

Specification data are reference values.

On Board Diagnosis Logic

UBS00DIK

The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the heated oxygen sensor 1. The oxygen
storage capacity before the three way catalyst (manifold) causes the
longer switching time. To judge the malfunctions of heated oxygen
sensor 2, ECM monitors whether the switching response of the sen-
sor's voltage is faster than specified during the various driving condi-
tion such as fuel-cut.

DTC Confirmation Procedure

UBS00DIL

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 5 seconds before conducting the next test.
TESTING CONDITION:
Open engine hood before conducting following procedure

 WITH CONSULT-II

1.

Start engine and warm it up to the normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

SEF327R

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S2 (B1)
HO2S2 (B2)

●

Warm-up condition

●

After keeping engine speed 
between 3,500 and 4,000 rpm for 
1 minute and at idle for 1 minute 
under no load.

Revving engine from idle up to 
3,000 rpm quickly

0 - 0.3V 

←→ Approx. 0.6 - 1.0V

HO2S2 MNTR 
(B1)
HO2S2 MNTR 
(B2)

LEAN 

←→ RICH

SEF302U

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0139
(Bank 1)

Heated oxygen sensor 
2 circuit slow response

It takes more time for the sensor to respond 
between rich and lean than the specified time.

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Harness or connectors
(The sensor circuit is open or shorted)

●

Heated oxygen sensor 2

●

Fuel pressure

●

Fuel injector

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Intake air leaks

P0159
(Bank 2)