2004 INFINITI QX56 Factory Service Manual

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Page 1649 of 3371

INFINITI QX56 2004 Factory Service Manual EC-458Revision: August 2007
DTC P1274, P1284 A/F SENSOR 1
2004 QX56
BANK 2
BBWA0919E

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INFINITI QX56 2004 Factory Service Manual DTC P1274, P1284 A/F SENSOR 1
EC-459
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Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not

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INFINITI QX56 2004 Factory Service Manual EC-460Revision: August 2007
DTC P1274, P1284 A/F SENSOR 1
2004 QX56
3. CLEAR THE SELF-LEARNING DATA.
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-

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INFINITI QX56 2004 Factory Service Manual DTC P1274, P1284 A/F SENSOR 1
EC-461
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4. CHECK HARNESS CONNECTOR
1. Turn ignition switch OFF.
2. Disconnect A/F sensor 1 harness connector.
3. C

Page 1653 of 3371

INFINITI QX56 2004 Factory Service Manual EC-462Revision: August 2007
DTC P1274, P1284 A/F SENSOR 1
2004 QX56
7. CHECK A/F SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. C

Page 1654 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P1276, P1286 A/F SENSOR 1
EC-463
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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-463
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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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INFINITI QX56 2004 Factory Service Manual EC-464Revision: August 2007
DTC P1276, P1286 A/F SENSOR 1
2004 QX56
If the indication is constantly approx. 1.5V and does not fluctuates, go to EC-469, "Diagnostic Procedure"
.
If the indication fluct

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INFINITI QX56 2004 Factory Service Manual DTC P1276, P1286 A/F SENSOR 1
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7. Repeat steps 2 to 3 five times.
8. Stop the vehicle and connect GST to the vehicle.
9. Make sure that n

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