Content .. 94 95 96 97 ..

Nissan Murano Z50 (2004 year). Manual - part 96

DTC P1229 SENSOR POWER SUPPLY

EC-447

Revision: 2004 November

2004 Murano

CHECK ACCELERATOR PEDAL POSITION SENSOR 1 POWER SUPPLY CIRCUIT

Disconnect accelerator pedal position (APP) sensor harness
connector.

Turn ignition switch ON.

Check voltage between APP sensor terminal 4 and ground with
CONSULT-II or tester.

OK or NG

>> GO TO 5.

>> GO TO 3.

CHECK SENSOR POWER SUPPLY CIRCUITS

Check harness for short to power and short to ground, between the following terminals.

OK or NG

>> GO TO 4.

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

CHECK COMPONENTS

Check the following.

●

EVAP control system pressure sensor (Refer to

EC-310, "Component Inspection"

●

Refrigerant pressure sensor (Refer to

ATC-83, "COMPONENT INSPECTION"

●

Power steering pressure sensor (Refer to

EC-360, "Component Inspection"

OK or NG

>> GO TO 7.

>> Replace malfunctioning component.

CHECK APP SENSOR

Refer to

EC-573, "Component Inspection"

OK or NG

>> GO TO 7.

>> GO TO 6.

PBIB1366E

Voltage: Approximately 5V

PBIB1808E

ECM terminal

Sensor terminal

Reference Wiring Diagram

APP sensor terminal 4

EC-576

EVAP control system pressure sensor terminal 3

EC-313

Refrigerant pressure sensor terminal 1

EC-634

PSP sensor terminal 3

EC-357

EC-448

DTC P1229 SENSOR POWER SUPPLY

Revision: 2004 November

2004 Murano

REPLACE ACCELERATOR PEDAL ASSEMBLY

Replace accelerator pedal assembly.

Perform

EC-43, "Accelerator Pedal Released Position Learning"

Perform

EC-43, "Throttle Valve Closed Position Learning"

Perform

EC-43, "Idle Air Volume Learning"

>> INSPECTION END

CHECK INTERMITTENT INCIDENT

Refer to

EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

>> INSPECTION END

DTC P1271, P1281 A/F SENSOR 1

EC-449

Revision: 2004 November

2004 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

Start engine and warm it up to normal operating temperature.

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-450

DTC P1271, P1281 A/F SENSOR 1

Revision: 2004 November

2004 Murano

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

EC-454, "Diag-

nostic Procedure"

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

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

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

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.

If 1st trip DTC is displayed, go to

EC-454, "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-451

Revision: 2004 November

2004 Murano

Wiring Diagram

ABS00A69

BANK 1

TBWA0692E

EC-452

DTC P1271, P1281 A/F SENSOR 1

Revision: 2004 November

2004 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)

LG/B

A/F sensor 1 (Bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 3.1V

O/L

Approximately 2.6V

BR/Y

Approximately 2.3V

Y/R

Approximately 2.3V

DTC P1271, P1281 A/F SENSOR 1

EC-453

Revision: 2004 November

2004 Murano

BANK 2

TBWA0693E

EC-454

DTC P1271, P1281 A/F SENSOR 1

Revision: 2004 November

2004 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

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

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

EC-139, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

A/F sensor 1 (Bank 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 2.6V

Approximately 2.3V

G/Y

Approximately 3.1V

L/G

Approximately 2.3V

PBIB1835E

DTC P1271, P1281 A/F SENSOR 1

EC-455

Revision: 2004 November

2004 Murano

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

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

Turn ignition switch ON.

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

OK or NG

>> GO TO 4.

>> GO TO 3.

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 or replace harness or connectors.

Voltage: Battery voltage

PBIB2293E

PBIB1683E

EC-456

DTC P1271, P1281 A/F SENSOR 1

Revision: 2004 November

2004 Murano

CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT

Turn ignition switch OFF.

Disconnect ECM harness connector.

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

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

Also check harness for short to power.

OK or NG

>> GO TO 5.

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

CHECK INTERMITTENT INCIDENT

Perform

EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"

OK or NG

>> Replace A/F sensor 1.

>> Repair or replace.

Removal and Installation

ABS00A6B

AIR FUEL RATIO (A/F) SENSOR 1

Refer to

EM-23, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

ECM terminal

A/F sensor 1 terminal

Bank1

Bank 2

Continuity should exist.

Bank 1

Bank 2

ECM terminal

A/F sensor 1 terminal

ECM terminal

A/F sensor 1 terminal

Continuity should not exist.

DTC P1272, P1282 A/F SENSOR 1

EC-457

Revision: 2004 November

2004 Murano

DTC P1272, P1282 A/F SENSOR 1

PFP:22693

Component Description

ABS00A6C

< 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.

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

WITH CONSULT-II

Start engine and warm it up to normal operating temperature.

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-458

DTC P1272, P1282 A/F SENSOR 1

Revision: 2004 November

2004 Murano

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

EC-462, "Diag-

nostic Procedure"

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

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

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

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.

If 1st trip DTC is displayed, go to

EC-462, "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-459

Revision: 2004 November

2004 Murano

Wiring Diagram

ABS00A6G

BANK 1

TBWA0692E

EC-460

DTC P1272, P1282 A/F SENSOR 1

Revision: 2004 November

2004 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)

LG/B

A/F sensor 1 (Bank 1)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 3.1V

O/L

Approximately 2.6V

BR/Y

Approximately 2.3V

Y/R

Approximately 2.3V

DTC P1272, P1282 A/F SENSOR 1

EC-461

Revision: 2004 November

2004 Murano

BANK 2

TBWA0693E

EC-462

DTC P1272, P1282 A/F SENSOR 1

Revision: 2004 November

2004 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

CHECK GROUND CONNECTIONS

Turn ignition switch OFF.

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

EC-139, "Ground Inspection"

OK or NG

>> GO TO 2.

>> Repair or replace ground connections.

TERMI-

NAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

A/F sensor 1 (Bank 2)

[Engine is running]

●

Warm-up condition

●

Idle speed

Approximately 2.6V

Approximately 2.3V

G/Y

Approximately 3.1V

Approximately 2.3V

PBIB1835E

Content .. 94 95 96 97 ..