Nissan Murano Z50 (2003 year). Manual - part 96

DTC P0134, P0154 HO2S1

EC-255

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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.

Removal and Installation

ABS004EC

HEATED OXYGEN SENSOR 1

Refer to 

EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

 .

EC-256

DTC P0138, P0158 HO2S2

Revision; 2004 April

2003 Murano

DTC P0138, P0158 HO2S2

PFP:226A0

Component Description

ABS004ED

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

ABS004EE

Specification data are reference values.

On Board Diagnosis Logic

ABS004EF

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 voltage is unusually high during
the various driving condition such as fuel-cut.

SEF327R

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S2 (B1)
HO2S2 (B2)

●

Warm-up condition

●

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

Revving engine from idle to 3,000 rpm 
quickly.

0 - 0.3V 

←→

 Approx. 0.6 - 

1.0V

HO2S2 MNTR (B1)
HO2S2 MNTR (B2)

LEAN 

←→

 RICH

SEF305UA

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0138
0138
(Bank 1)

Heated oxygen sensor 
2 circuit high voltage

An excessively high voltage from the sensor is 
sent to ECM.

●

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

●

Heated oxygen sensor 2

P0158
0158
(Bank 2)

DTC P0138, P0158 HO2S2

EC-257

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DTC Confirmation Procedure

ABS004EG

CAUTION:

Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 10 seconds before conducting the next test.

 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 tempera-
ture.

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 one minute under no load.

5.

Let engine idle for two minutes.

6.

If 1st trip DTC is detected, go to 

EC-261, "Diagnostic Procedure"

.

 WITH GST

1.

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

2.

Turn ignition switch “OFF” and wait at least 10 seconds.

3.

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

4.

Let engine idle for two minutes.

5.

Turn ignition switch “OFF” and wait at least 10 seconds.

6.

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

7.

Let engine idle for two minutes.

8.

Select “Mode 3” with GST.

9.

If DTC is detected, go to 

EC-261, "Diagnostic Procedure"

 .

SEF174Y

EC-258

DTC P0138, P0158 HO2S2

Revision; 2004 April

2003 Murano

Wiring Diagram

ABS004EH

BANK 1

TBWA0542E

DTC P0138, P0158 HO2S2

EC-259

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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)

74

W

Heated oxygen sensor 2 
(bank 1)

[Engine is running]

●

Warm-up condition

●

Revving engine from idle to 3,000 rpm 
quickly after the following conditions are 
met.

–

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

0 - Approximately 1.0V

78

B

Sensors' ground
(Heated oxygen sensor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

EC-260

DTC P0138, P0158 HO2S2

Revision; 2004 April

2003 Murano

BANK 2

TBWA0543E

DTC P0138, P0158 HO2S2

EC-261

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Revision; 2004 April

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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

ABS004EI

1. 

RETIGHTEN GROUND SCREWS

1.

Turn ignition switch “OFF”.

2.

Loosen and retighten engine ground screws.

>> GO TO 2.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

55

W

Heated oxygen sensor 2 
(bank 2)

[Engine is running]

●

Warm-up condition

●

Revving engine from idle to 3,000 rpm 
quickly after the following conditions are 
met.

–

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

0 - Approximately 1.0V

78

B

Sensors' ground
(Heated oxygen sensor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V

PBIB1298E

EC-262

DTC P0138, P0158 HO2S2

Revision; 2004 April

2003 Murano

2. 

CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch “OFF”.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

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

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Joint connector-2

●

Harness for open or short between HO2S2 and engine ground

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

Continuity should exist.

PBIB1352E

DTC P0138, P0158 HO2S2

EC-263

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4. 

CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

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

3.

Check harness continuity between the following terminals and ground.
Refer to Wiring Diagram.

4.

Also check harness for short to power.

OK or NG

OK

>> GO TO 5.

NG

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

5. 

CHECK HO2S2 CONNECTOR FOR WATER

1.

Turn ignition switch “OFF”.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

Check connectors for water.

OK or NG

OK

>> GO TO 6.

NG

>> Repair or replace harness or connectors.

6. 

CHECK HEATED OXYGEN SENSOR 2

Refer to 

EC-264, "Component Inspection"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Replace malfunctioning heated oxygen sensor 2.

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-151, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

DTC

Terminals

Bank

ECM

Sensor

P0138

74

1

1

P0158

55

1

2

Continuity should exist.

DTC

Terminals

Bank

ECM

Sensor

P0138

74

1

1

P0158

55

1

2

Continuity should not exist.

Water should not exist.

EC-264

DTC P0138, P0158 HO2S2

Revision; 2004 April

2003 Murano

Component Inspection

ABS004EJ

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 tempera-
ture.

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 one minute under no load.

5.

Let engine idle for one 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 0.63V 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.

 Without 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.

3.

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

4.

Let engine idle for one minute.

5.

Set voltmeter probes between ECM terminal 74 [HO2S2 (B1) signal] or 55 [HO2S2 (B2) signal] and
engine ground.

SEF174Y

SEF662Y

PBIB0796E

DTC P0138, P0158 HO2S2

EC-265

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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 0.63V at least once during this
procedure.
If the voltage is above 0.63V 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.
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.

Removal and Installation

ABS004EK

HEATED OXYGEN SENSOR 2

Refer to 

EM-22, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

 .

PBIB1607E

EC-266

DTC P0139, P0159 HO2S2

Revision; 2004 April

2003 Murano

DTC P0139, P0159 HO2S2

PFP:226A0

Component Description

ABS004EL

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

ABS004EM

Specification data are reference values.

On Board Diagnosis Logic

ABS004EN

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.

SEF327R

MONITOR ITEM

CONDITION

SPECIFICATION

HO2S2 (B1)
HO2S2 (B2)

●

Warm-up condition

●

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

Revving engine from idle 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
0139
(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.

●

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

●

Heated oxygen sensor 2

●

Fuel pressure

●

Injectors

●

Intake air leaks

P0159
0159
(Bank 2)

DTC P0139, P0159 HO2S2

EC-267

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Revision; 2004 April

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DTC Confirmation Procedure

ABS004EO

NOTE:
If “DTC Confirmation Procedure” has been previously conducted, always turn ignition switch “OFF” and wait at
least 10 seconds before conducting the next test.

 WITH CONSULT-II

TESTING CONDITION:
For better results, perform “DTC WORK SUPPORT” at a temperature of 0 to 30 

°

C (32 to 86 

°

F).

1.

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

2.

Start engine and warm it up to the normal operating tempera-
ture.

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 one minute under no load.

5.

Let engine idle for one minute.

6.

Make sure that “COOLAN TEMP/S” indicates more than 70

°

C

(158

°

F).

If not, warm up engine and go to next step when “COOLAN
TEMP/S” indication reaches to 70

°

C (158

°

F).

7.

Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT-II.

8.

Start engine and following the instruction of CONSULT-II.

9.

Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to 

EC-272, "Diagnostic Procedure"

 .

If “CAN NOT BE DIAGNOSED” is displayed, perform the following.

a.

Turn ignition switch “OFF” and leave the vehicle in a cool place (soak the vehicle).

b.

Return to step 1.

Overall Function Check

ABS004EP

Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a
DTC might not be confirmed.

 WITH GST

1.

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

2.

Turn ignition switch “OFF” and wait at least 10 seconds.

3.

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

4.

Let engine idle for one minute.

5.

Set voltmeter probes between ECM terminal 74 [HO2S2 (B1) signal] or 55 [HO2S2 (B2) signal] and
engine ground.

SEF174Y

PBIB0115E

EC-268

DTC P0139, P0159 HO2S2

Revision; 2004 April

2003 Murano

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.)
A change of voltage should be more than 0.06V for 1 sec-
ond during this procedure.
If the voltage can be confirmed in step 6, step 7 is not nec-
essary.

7.

Keep vehicle at idling for 10 minutes, then check the voltage. Or
check the voltage when coasting from 80 km/h (50 MPH) in “D”
position.
A change of voltage should be more than 0.06V for 1 sec-
ond during this procedure.

8.

If NG, go to 

EC-272, "Diagnostic Procedure"

 .

PBIB1607E

DTC P0139, P0159 HO2S2

EC-269

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Revision; 2004 April

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Wiring Diagram

ABS004EQ

BANK 1

TBWA0542E

EC-270

DTC P0139, P0159 HO2S2

Revision; 2004 April

2003 Murano

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)

74

W

Heated oxygen sensor 2 
(bank 1)

[Engine is running]

●

Warm-up condition

●

Revving engine from idle to 3,000 rpm 
quickly after the following conditions are 
met.

–

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

0 - Approximately 1.0V

78

B

Sensors' ground
(Heated oxygen sensor)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 0V