Nissan Murano Z50 (2005 year). Manual - part 108

 

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Nissan Murano Z50 (2005 year). Manual - part 108

 

 

DTC P1271, P1281 A/F SENSOR 1

EC-483

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Revision: 2005 August

2005 Murano

DTC P1271, P1281 A/F SENSOR 1

PFP:22693

Component Description

ABS00A65

The A/F sensor is a planar dual-cell limit current sensor. The sensor
element of the A/F sensor is the combination of a Nernst concentra-
tion cell (sensor cell) with an oxygen-pump cell, which transports
ions. It has a heater in the element.
The sensor is capable of precise measurement   = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide   range (0.7 <

 < air).

The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.

An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at   = 1. Therefore, the A/F sensor is able to
indicate air/fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800

°

C (1,292 - 1,472

°

F).

CONSULT-II Reference Value in Data Monitor Mode

ABS00A66

Specification data are reference values.

On Board Diagnosis Logic

ABS00A67

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/
F) sensor 1 signal is not inordinately low.

DTC Confirmation Procedure

ABS00A68

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT-II.

SEF579Z

SEF580Z

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)
A/F SEN1 (B2)

Engine: After warming up

Maintaining engine speed at 
2,000 rpm

Fluctuates around 1.5V

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P1271
1271
(Bank 1)

Air fuel ratio (A/F) sensor 1 
circuit no activity detected

The A/F signal computed by ECM from the 
A/F sensor 1 signal is constantly approx. 0V.

Harness or connectors
(The A/F sensor 1 circuit is open or 
shorted.)

Air fuel ratio (A/F) sensor 1

P1281
1281
(Bank 2)

EC-484

DTC P1271, P1281 A/F SENSOR 1

Revision: 2005 August

2005 Murano

3.

Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
If the indication is constantly approx. 0V, go to 

EC-488, "Diag-

nostic Procedure"

 .

If the indication is not constantly approx. 0V, go to next step.

4.

Turn ignition switch OFF, wait at least 10 seconds and then
restart engine.

5.

Drive and accelerate vehicle to more than 40 km/h (25 MPH)
within 20 seconds after restarting engine.

6.

Maintain the following conditions for about 20 consecutive sec-
onds.

NOTE:

Keep the accelerator pedal as steady as possible during the cruising.

If this procedure is not completed within 1 minute after restarting engine at step 4, return to step
4.

7.

If 1st trip DTC is displayed, go to 

EC-488, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

ENG SPEED

1,000 - 3,200 rpm

VHCL SPEED SE

More than 40 km/h (25 MPH)

B/FUEL SCHDL

1.5 - 9.0 msec

Gear position

Suitable position

SEF581Z

DTC P1271, P1281 A/F SENSOR 1

EC-485

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Revision: 2005 August

2005 Murano

Wiring Diagram

ABS00A69

BANK 1

TBWA0692E

EC-486

DTC P1271, P1281 A/F SENSOR 1

Revision: 2005 August

2005 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.

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

16

LG/B

A/F sensor 1 (Bank 1)

[Engine is running]

Warm-up condition

Idle speed

Approximately 3.1V

35

O/L

Approximately 2.6V

56

BR/Y

Approximately 2.3V

75

LG

Approximately 2.3V

DTC P1271, P1281 A/F SENSOR 1

EC-487

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Revision: 2005 August

2005 Murano

BANK 2

TBWA0693E

EC-488

DTC P1271, P1281 A/F SENSOR 1

Revision: 2005 August

2005 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.

Diagnostic Procedure

ABS00A6A

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws on the body.
Refer to 

EC-166, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

57

P

A/F sensor 1 (Bank 2)

[Engine is running]

Warm-up condition

Idle speed

Approximately 2.6V

58

SB

Approximately 2.3V

76

G/Y

Approximately 3.1V

77

L/G

Approximately 2.3V

PBIB1835E

DTC P1271, P1281 A/F SENSOR 1

EC-489

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Revision: 2005 August

2005 Murano

2. 

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1.

Disconnect air fuel ratio (A/F) sensor 1 harness connector.

2.

Turn ignition switch ON.

3.

Check voltage between A/F sensor 1 terminal 3 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 8.

NG

>> GO TO 3.

3. 

CHECK CONDENSER CIRCUIT-I

1.

Turn ignition switch OFF.

2.

Disconnect fuse block (J/B) harness connector M1.

3.

Check resistance between fuse block (J/B) terminal 9A and ground.
Refer to Wiring Diagram. 

4.

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

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 5.

4. 

DETECT MALFUNCTIONING PART

Check the following.

Harness connectors M82, F102

Fuse block (J/B) connector M1

15A fuse

Harness for open or short between A/F sensor 1 and fuse

>> Repair harness or connectors.

Voltage: Battery voltage

PBIB2293E

PBIB1683E

Resistance: Above 1M

 at 25

°

C (77

°

F)

EC-490

DTC P1271, P1281 A/F SENSOR 1

Revision: 2005 August

2005 Murano

5. 

CHECK CONDENSER CIRCUIT-II

1.

Disconnect condenser harness connectors.

2.

Check harness continuity between fuse block (J/B) terminal 9A and condenser terminal 1, condenser ter-
minal 2 and ground.
Refer to Wiring Diagram. 

3.

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

OK or NG

OK

>> GO TO 6.

NG

>> Repair harness or connectors.

6. 

CHECK CONDENSER

Refer to 

EC-408, "CONDENSER"

 .

OK or NG

OK

>> GO TO 7.

NG

>> Replace condenser.

7. 

CHECK INTERMITTENT INCIDENT

Refer to 

EC-157, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

>> INSPECTION END

Continuity should exist.

DTC P1271, P1281 A/F SENSOR 1

EC-491

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Revision: 2005 August

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8. 

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

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

4.

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

5.

Also check harness for short to power.

OK or NG

OK

>> GO TO 9.

NG

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

9. 

CHECK INTERMITTENT INCIDENT

Perform 

EC-157, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

 .

OK or NG

OK

>> Go to 10.

NG

>> Repair or replace.

10. 

REPLACE AIR FUEL RATIO (A/F) SENSOR 1

Replace air fuel ratio (A/F) sensor 1.

CAUTION:

Discard any air fuel ratio (A/F) 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 air fuel ratio (A/F) sensor, clean exhaust system threads using Heated Oxy-
gen Sensor Thread Cleaner tool J-43897-18 or J-43897-12 and approved anti-seize lubricant.

>> INSPECTION END

A/F sensor 1 terminal

ECM terminal

Bank 1

1

16

2

75

5

35

6

56

Bank 2

1

76

2

77

5

57

6

58

Continuity should exist.

Bank 1

Bank 2

A/F sensor 1 terminal

ECM terminal

A/F sensor 1 terminal

ECM terminal

1

16

1

76

2

75

2

77

5

35

5

57

6

56

6

58

Continuity should not exist.

EC-492

DTC P1271, P1281 A/F SENSOR 1

Revision: 2005 August

2005 Murano

Removal and Installation

ABS00A6B

AIR FUEL RATIO (A/F) SENSOR 1

Refer to 

EM-25, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

 .

DTC P1272, P1282 A/F SENSOR 1

EC-493

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Revision: 2005 August

2005 Murano

DTC P1272, P1282 A/F SENSOR 1

PFP:22693

Component Description

ABS00A6C

The A/F sensor is a planar dual-cell limit current sensor. The sensor
element of the A/F sensor is the combination of a Nernst concentra-
tion cell (sensor cell) with an oxygen-pump cell, which transports
ions. It has a heater in the element.
The sensor is capable of precise measurement   = 1, but also in the
lean and rich range. Together with its control electronics, the sensor
outputs a clear, continuous signal throughout a wide   range (0.7 <

 < air).

The exhaust gas components diffuse through the diffusion gap at the
electrode of the oxygen pump and Nernst concentration cell, where
they are brought to thermodynamic balance.

An electronic circuit controls the pump current through the oxygen-
pump cell so that the composition of the exhaust gas in the diffusion
gap remains constant at   = 1. Therefore, the A/F sensor is able to
indicate air/fuel ratio by this pumping of current. In addition, a heater
is integrated in the sensor to ensure the required operating tempera-
ture of 700 - 800

°

C (1,292 - 1,472

°

F).

CONSULT-II Reference Value in Data Monitor Mode

ABS00A6D

Specification data are reference values.

On Board Diagnosis Logic

ABS00A6E

To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the air fuel ratio (A/
F) sensor 1 signal is not inordinately high.

DTC Confirmation Procedure

ABS00A6F

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.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is more than 11V at idle.

 WITH CONSULT-II

1.

Start engine and warm it up to normal operating temperature.

2.

Select “A/F SEN1 (B1)” or “A/F SEN1 (B2)” in “DATA MONITOR” mode with CONSULT-II.

SEF579Z

SEF580Z

MONITOR ITEM

CONDITION

SPECIFICATION

A/F SEN1 (B1)
A/F SEN1 (B2)

Engine: After warming up

Maintaining engine speed at 
2,000 rpm

Fluctuates around 1.5V

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible Cause

P1272
1272
(Bank 1)

Air fuel ratio (A/F) sensor 1 
circuit no activity detected

The A/F signal computed by ECM from the A/F 
sensor 1 signal is constantly approx. 5V.

Harness or connectors
(The A/F sensor 1 circuit is open or 
shorted.)

Air fuel ratio (A/F) sensor 1

P1282
1282
(Bank 2)

EC-494

DTC P1272, P1282 A/F SENSOR 1

Revision: 2005 August

2005 Murano

3.

Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
If the indication is constantly approx. 5V, go to 

EC-498, "Diag-

nostic Procedure"

 .

If the indication is not constantly approx. 5V, go to next step.

4.

Turn ignition switch OFF, wait at least 10 seconds and then
restart engine.

5.

Drive and accelerate vehicle to more than 40 km/h (25 MPH)
within 20 seconds after restarting engine.

6.

Maintain the following conditions for about 20 consecutive sec-
onds.

NOTE:

Keep the accelerator pedal as steady as possible during the cruising.

If this procedure is not completed within 1 minute after restarting engine at step 4, return to step
4.

7.

If 1st trip DTC is displayed, go to 

EC-498, "Diagnostic Procedure"

 .

 WITH GST

Follow the procedure “WITH CONSULT-II” above.

ENG SPEED

1,000 - 3,200 rpm

VHCL SPEED SE

More than 40 km/h (25 MPH)

B/FUEL SCHDL

1.5 - 9.0 msec

Gear position

Suitable position

SEF581Z

DTC P1272, P1282 A/F SENSOR 1

EC-495

C

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G

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EC

Revision: 2005 August

2005 Murano

Wiring Diagram

ABS00A6G

BANK 1

TBWA0692E

EC-496

DTC P1272, P1282 A/F SENSOR 1

Revision: 2005 August

2005 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.

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

16

LG/B

A/F sensor 1 (Bank 1)

[Engine is running]

Warm-up condition

Idle speed

Approximately 3.1V

35

O/L

Approximately 2.6V

56

BR/Y

Approximately 2.3V

75

Y/R

Approximately 2.3V

DTC P1272, P1282 A/F SENSOR 1

EC-497

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Revision: 2005 August

2005 Murano

BANK 2

TBWA0693E

EC-498

DTC P1272, P1282 A/F SENSOR 1

Revision: 2005 August

2005 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.

Diagnostic Procedure

ABS00A6H

1. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws on the body.
Refer to 

EC-166, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 2.

NG

>> Repair or replace ground connections.

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

57

P

A/F sensor 1 (Bank 2)

[Engine is running]

Warm-up condition

Idle speed

Approximately 2.6V

58

SB

Approximately 2.3V

76

G/Y

Approximately 3.1V

77

LG

Approximately 2.3V

PBIB1835E

 

 

 

 

 

 

 

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