Nissan Murano Z50 (2004 year). Manual — part 97
DTC P1272, P1282 A/F SENSOR 1
EC-463
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Revision: 2004 November
2004 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 4.
NG
>> GO TO 3.
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-464
DTC P1272, P1282 A/F SENSOR 1
Revision: 2004 November
2004 Murano
4.
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 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK INTERMITTENT INCIDENT
Perform
EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
OK or NG
OK
>> Replace A/F sensor 1.
NG
>> Repair or replace.
Removal and Installation
ABS00A6I
AIR FUEL RATIO (A/F) SENSOR 1
Refer to
EM-23, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
.
ECM terminal
A/F sensor 1 terminal
Bank 1
16
1
76
1
35
5
56
6
75
2
Bank 2
76
1
57
5
58
6
77
2
Continuity should exist.
Bank 1
Bank 2
ECM terminal
A/F sensor 1 terminal
ECM terminal
A/F sensor 1 terminal
16
1
76
1
35
5
57
5
56
6
58
6
75
2
77
2
Continuity should not exist.
DTC P1273, P1283 A/F SENSOR 1
EC-465
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Revision: 2004 November
2004 Murano
DTC P1273, P1283 A/F SENSOR 1
PFP:22693
Component Description
ABS00A6J
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
ABS00A6K
Specification data are reference values.
On Board Diagnosis Logic
ABS00A6L
To judge the malfunction, the A/F signal computed by ECM from the air fuel ratio (A/F) sensor 1 signal is mon-
itored not to be shifted LEAN side or RICH side.
DTC Confirmation Procedure
ABS00A6M
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.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-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
P1273
1273
(Bank 1)
Air fuel ratio (A/F) sensor 1
lean shift monitoring
●
The output voltage computed by ECM from the
A/F sensor 1 signal is shifted to the lean side
for a specified period.
●
Air fuel ratio (A/F) sensor 1
●
Air fuel ratio (A/F) sensor 1 heater
●
Fuel pressure
●
Fuel injector
●
Intake air leaks
P1283
1283
(Bank 2)
EC-466
DTC P1273, P1283 A/F SENSOR 1
Revision: 2004 November
2004 Murano
4.
Clear the self-learning coefficient by touching “CLEAR”.
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 1 minute under no load.
7.
Let engine idle for 1 minute.
8.
Keep engine speed between 2,500 and 3,000 rpm for 13 min-
utes.
9.
If 1st trip DTC is detected, go to
EC-470, "Diagnostic Procedure"
.
WITH GST
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Disconnect mass air flow sensor harness connector.
4.
Start engine and let it idle for at least 5 seconds.
5.
Stop engine and reconnect mass air flow sensor harness con-
nector.
6.
Select MODE 3 with GST and make sure that DTC P0102 is
detected.
7.
Select MODE 4 with GST and erase the DTC P0102.
8.
Start engine and keep the engine speed between 3,500 and
4,000 rpm for 1 minute under no load.
9.
Let engine idle for 1 minute.
10. Keep engine speed between 2,500 and 3,000 rpm for 13 min-
utes.
11. Select MODE 7 with GST.
If 1st trip DTC is detected, go to
EC-470, "Diagnostic Procedure"
.
SEF968Y
PBIB1353E
DTC P1273, P1283 A/F SENSOR 1
EC-467
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Revision: 2004 November
2004 Murano
Wiring Diagram
ABS00A6N
BANK 1
TBWA0692E
EC-468
DTC P1273, P1283 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)
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 P1273, P1283 A/F SENSOR 1
EC-469
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Revision: 2004 November
2004 Murano
BANK 2
TBWA0693E
EC-470
DTC P1273, P1283 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
ABS00A6O
1.
CHECK GROUND CONNECTIONS
1.
Turn ignition switch OFF.
2.
Loosen and retighten two ground screws on the body.
Refer to
OK or NG
OK
>> GO TO 2.
NG
>> Repair or replace ground connections.
2.
RETIGHTEN AIR FUEL RATIO (A/F) SENSOR 1
Loosen and retighten the air fuel ratio (A/F) sensor 1.
>> GO TO 3.
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
Tightening torque: 40 - 60 N-m (4.1 - 6.1 kg-m, 30 - 44 ft-lb)
PBIB2291E
DTC P1273, P1283 A/F SENSOR 1
EC-471
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Revision: 2004 November
2004 Murano
3.
CLEAR THE SELF-LEARNING DATA.
With CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CONSULT-II.
3.
Clear the self-learning control coefficient by touching “CLEAR”.
4.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0174 detected?
Is it difficult to start engine?
Without CONSULT-II
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF.
3.
Disconnect mass air flow sensor harness connector.
4.
Restart engine and let it idle for at least 3 seconds.
5.
Stop engine and reconnect mass air flow sensor harness con-
nector.
6.
Make sure DTC P0102 is displayed.
7.
Erase the DTC memory. Refer to
EMISSION-RELATED DIAGNOSTIC INFORMATION"
.
8.
Make sure DTC P0000 is displayed.
9.
Run engine for at least 10 minutes at idle speed.
Is the 1st trip DTC P0171 or P0174 detected?
Is it difficult to start engine?
Yes or No
Yes
>> Perform trouble diagnosis for DTC P0171or P0174. Refer to
.
No
>> GO TO 4.
SEF968Y
PBIB1353E
EC-472
DTC P1273, P1283 A/F SENSOR 1
Revision: 2004 November
2004 Murano
4.
CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect air fuel ratio (A/F) sensor 1 harness connector.
3.
Turn ignition switch ON.
4.
Check voltage between A/F sensor 1 terminal 3 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
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
DTC P1273, P1283 A/F SENSOR 1
EC-473
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Revision: 2004 November
2004 Murano
6.
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 7.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK A/F SENSOR 1 HEATER
Refer to
EC-372, "Component Inspection"
OK or NG
OK
>> GO TO 8.
NG
>> Replace A/F sensor 1.
8.
CHECK INTERMITTENT INCIDENT
Perform
EC-130, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
OK or NG
OK
>> Replace A/F sensor 1.
NG
>> Repair or replace.
Removal and Installation
ABS00A6P
AIR FUEL RATIO (A/F) SENSOR 1
Refer to
EM-23, "EXHAUST MANIFOLD AND THREE WAY CATALYST"
ECM terminal
A/F sensor 1 terminal
Bank 1
16
1
35
5
56
6
75
2
Bank 2
76
1
57
5
58
6
77
2
Continuity should exist.
Bank 1
Bank 2
ECM terminal
A/F sensor 1 terminal
ECM terminal
A/F sensor 1 terminal
16
1
76
1
35
5
57
5
56
6
58
6
75
2
77
2
Continuity should not exist.
EC-474
DTC P1274, P1284 A/F SENSOR 1
Revision: 2004 November
2004 Murano
DTC P1274, P1284 A/F SENSOR 1
PFP:22693
Component Description
ABS00A6Q
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
ABS00A6R
Specification data are reference values.
On Board Diagnosis Logic
ABS00A6S
To judge the malfunction, the A/F signal computed by ECM from the air fuel ratio (A/F) sensor 1 signal is mon-
itored not to be shifted to the LEAN side or RICH side.
DTC Confirmation Procedure
ABS00A6T
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.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-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
P1274
1274
(Bank 1)
Air fuel ratio (A/F) sensor 1
rich shift monitoring
●
The A/F signal computed by ECM from the
A/F sensor 1 signal is shifted to the rich side
for a specified period.
●
Air fuel ratio (A/F) sensor 1
●
Air fuel ratio (A/F) sensor 1 heater
●
Fuel pressure
●
Fuel injector
P1284
1244
(Bank 2)
DTC P1274, P1284 A/F SENSOR 1
EC-475
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EC
Revision: 2004 November
2004 Murano
4.
Clear the self-learning coefficient by touching “CLEAR”.
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 1 minute under no load.
7.
Let engine idle for 1 minute.
8.
Keep engine speed between 2,500 and 3,000 rpm for 20 min-
utes.
9.
If 1st trip DTC is detected, go to
EC-479, "Diagnostic Procedure"
.
WITH GST
1.
Start engine and warm it up to normal operating temperature.
2.
Turn ignition switch OFF and wait at least 10 seconds.
3.
Disconnect mass air flow sensor harness connector.
4.
Start engine and let it idle for at least 5 seconds.
5.
Stop engine and reconnect mass air flow sensor harness con-
nector.
6.
Select MODE 3 with GST and make sure that DTC P0102 is
detected.
7.
Select MODE 4 with GST and erase the DTC P0102.
8.
Start engine and keep the engine speed between 3,500 and
4,000 rpm for 1 minute under no load.
9.
Let engine idle for 1 minute.
10. Keep engine speed between 2,500 and 3,000 rpm for 20 min-
utes.
11. Select MODE 7 with GST.
If 1st trip DTC is detected, go to
EC-479, "Diagnostic Procedure"
SEF968Y
PBIB1353E
EC-476
DTC P1274, P1284 A/F SENSOR 1
Revision: 2004 November
2004 Murano
Wiring Diagram
ABS00A6U
BANK 1
TBWA0692E
DTC P1274, P1284 A/F SENSOR 1
EC-477
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A
EC
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)
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
EC-478
DTC P1274, P1284 A/F SENSOR 1
Revision: 2004 November
2004 Murano
BANK 2
TBWA0693E
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