2005 INFINITI QX4 Factory Service Manual

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Page 1681 of 3419

INFINITI QX4 2005 Factory Service Manual EC-490Revision: October 2005
DTC P1274, P1284 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 1682 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1274, P1284 A/F SENSOR 1
EC-491
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Revision: October 20052005 QX56
BANK 2
BBWA1701E

Page 1683 of 3419

INFINITI QX4 2005 Factory Service Manual EC-492Revision: October 2005
DTC P1274, P1284 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 1684 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1274, P1284 A/F SENSOR 1
EC-493
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3. CLEAR THE SELF-LEARNING DATA.
With CONSULT-II
1. Start engine and warm it up to normal operating temp

Page 1685 of 3419

INFINITI QX4 2005 Factory Service Manual EC-494Revision: October 2005
DTC P1274, P1284 A/F SENSOR 1
2005 QX56
4. CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. Check harness connector fo

Page 1686 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1274, P1284 A/F SENSOR 1
EC-495
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Revision: October 20052005 QX56
7. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect

Page 1687 of 3419

INFINITI QX4 2005 Factory Service Manual EC-496Revision: October 2005
DTC P1274, P1284 A/F SENSOR 1
2005 QX56
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

Page 1688 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P1276, P1286 A/F SENSOR 1
EC-497
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Revision: October 20052005 QX56
DTC P1276, P1286 A/F SENSOR 1PFP:22693
Component DescriptionUBS00HA7
The air fuel ratio (A/F) sensor 1 is

DTC P1276, P1286 A/F SENSOR 1
EC-497
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Revision: October 20052005 QX56
DTC P1276, P1286 A/F SENSOR 1PFP:22693
Component DescriptionUBS00HA7
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 ModeUBS00HA8
Specification data are reference values.
On Board Diagnosis LogicUBS00HA9
To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1
signal fluctuates according to fuel feedback control.
DTC Confirmation ProcedureUBS00HAA
CAUTION:
Always drive vehicle at a safe speed.
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.
3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
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
P1276
1276
(Bank 1)
Air fuel ratio (A/F) sensor 1
circuit high voltage
The A/F signal computed by ECM from the A/F
sensor 1 signal is constantly approx. 1.5V.
Harness or connectors
(The A/F sensor 1 circuit is open or
shorted.)
Air fuel ratio (A/F) sensor 1
P1286
1286
(Bank 2)

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