2005 INFINITI QX4 Factory Service Manual

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Page 1657 of 3419

INFINITI QX4 2005 Factory Service Manual EC-466Revision: October 2005
DTC P1271, P1281 A/F SENSOR 1
2005 QX56
4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3.

Page 1658 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1271, P1281 A/F SENSOR 1
EC-467
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Revision: October 20052005 QX56
Removal and InstallationUBS00H9L
AIR FUEL RATIO (A/F) SENSOR 1
Refer to EM-19, "EXHAUST MANIFOLD AND THRE

Page 1659 of 3419

INFINITI QX4 2005 Factory Service Manual EC-468Revision: October 2005
DTC P1272, P1282 A/F SENSOR 1
2005 QX56
DTC P1272, P1282 A/F SENSOR 1PFP:22693
Component DescriptionUBS00H9M
The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit

EC-468Revision: October 2005
DTC P1272, P1282 A/F SENSOR 1
2005 QX56
DTC P1272, P1282 A/F SENSOR 1PFP:22693
Component DescriptionUBS00H9M
The air fuel ratio (A/F) sensor 1 is a planar dual-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is the combination of a
Nernst concentration 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 1 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 ModeUBS00H9N
Specification data are reference values.
On Board Diagnosis LogicUBS00H9O
To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal is not inordinately high.
DTC Confirmation ProcedureUBS00H9P
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 10.5V 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.
SEF 5 79 Z
SEF 5 80 Z
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)
A/F SEN1 (B2)
Engine: After warming upMaintaining engine speed at
2,000 rpmFluctuates 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)

Page 1660 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1272, P1282 A/F SENSOR 1
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Revision: October 20052005 QX56
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
If the indication is constantly approx. 5

Page 1661 of 3419

INFINITI QX4 2005 Factory Service Manual EC-470Revision: October 2005
DTC P1272, P1282 A/F SENSOR 1
2005 QX56
Wiring DiagramUBS00H9Q
BANK 1
BBWA1700E

Page 1662 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1272, P1282 A/F SENSOR 1
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Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do no

Page 1663 of 3419

INFINITI QX4 2005 Factory Service Manual EC-472Revision: October 2005
DTC P1272, P1282 A/F SENSOR 1
2005 QX56
BANK 2
BBWA1701E

Page 1664 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1272, P1282 A/F SENSOR 1
EC-473
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Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do no

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