2005 INFINITI QX4 Factory Service Manual

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Page 1665 of 3419

INFINITI QX4 2005 Factory Service Manual EC-474Revision: October 2005
DTC P1272, P1282 A/F SENSOR 1
2005 QX56
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect A/F sensor 1 harness connector.
2. Turn ignition switch O

Page 1666 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1272, P1282 A/F SENSOR 1
EC-475
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4. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect

Page 1667 of 3419

INFINITI QX4 2005 Factory Service Manual EC-476Revision: October 2005
DTC P1272, P1282 A/F SENSOR 1
2005 QX56
Removal and InstallationUBS00H9S
AIR FUEL RATIO (A/F) SENSOR 1
Refer to EM-19, "EXHAUST MANIFOLD AND THREE WAY CATALYST" .

Page 1668 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1273, P1283 A/F SENSOR 1
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DTC P1273, P1283 A/F SENSOR 1PFP:22693
Component DescriptionUBS00H9T
The air fuel ratio (A/F) sensor 1 is

DTC P1273, P1283 A/F SENSOR 1
EC-477
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Revision: October 20052005 QX56
DTC P1273, P1283 A/F SENSOR 1PFP:22693
Component DescriptionUBS00H9T
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 ModeUBS00H9U
Specification data are reference values.
On Board Diagnosis LogicUBS00H9V
To judge the malfunction, the A/F signal computed by ECM from the A/F sensor 1 signal is monitored not to be
shifted to LEAN side or RICH side.
DTC Confirmation ProcedureUBS00H9W
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.
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
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)

Page 1669 of 3419

INFINITI QX4 2005 Factory Service Manual EC-478Revision: October 2005
DTC P1273, P1283 A/F SENSOR 1
2005 QX56
4. Clear the self-learning coefficient by touching “CLEAR”.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Start

Page 1670 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1273, P1283 A/F SENSOR 1
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Revision: October 20052005 QX56
Wiring Diagram UBS00H9X
BANK 1
BBWA1700E

Page 1671 of 3419

INFINITI QX4 2005 Factory Service Manual EC-480Revision: October 2005
DTC P1273, P1283 A/F SENSOR 1
2005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals

Page 1672 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1273, P1283 A/F SENSOR 1
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Revision: October 20052005 QX56
BANK 2
BBWA1701E

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