2006 INFINITI QX56 Factory Service Manual

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Page 1433 of 3383

INFINITI QX56 2006 Factory Service Manual EC-222Revision: November 2009
DTC P0130, P0150 A/F SENSOR 1
2006 QX56
Removal and InstallationUBS00HAE
AIR FUEL RATIO (A/F) SENSOR 1
Refer to EM-21, "EXHAUST MANIFOLD AND THREE WAY CATALYST"

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INFINITI QX56 2006 Factory Service Manual DTC P0131, P0151 A/F SENSOR 1EC-223
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Revision: November 2009 2006 QX56
DTC P0131, P0151 A/F SENSOR 1PFP:22693
Component DescriptionUBS00H9F
The air fuel ratio (A/F) sensor 1 i

DTC P0131, P0151 A/F SENSOR 1EC-223
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Revision: November 2009 2006 QX56
DTC P0131, P0151 A/F SENSOR 1PFP:22693
Component DescriptionUBS00H9F
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 ModeUBS00H9G
Specification data are reference values.
On Board Diagnosis LogicUBS00H9H
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 low.
DTC Confirmation ProcedureUBS00H9I
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.
SEF579Z
SEF580Z
MONITOR ITEM CONDITIONSPECIFICATION
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 conditionPossible Cause
P0131
0131
(Bank 1) Air fuel ratio (A/F) sensor 1
circuit low voltage
The A/F signal computed by ECM from the
A/F sensor 1 signal is constantly approx. 0V.
Harness or connectors
(The A/F sensor 1 circuit is open or
shorted.)
Air fuel ratio (A/F) sensor 1
P0151
0151
(Bank 2)

Page 1435 of 3383

INFINITI QX56 2006 Factory Service Manual EC-224Revision: November 2009
DTC P0131, P0151 A/F SENSOR 1
2006 QX56
3. Check “A/F SEN1 (B1) ” or “A/F SEN1 (B2) ” indication.
If the indication is constantly approx. 0V, go to EC-228, "
Dia

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INFINITI QX56 2006 Factory Service Manual DTC P0131, P0151 A/F SENSOR 1EC-225
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Revision: November 2009 2006 QX56
Wiring DiagramUBS00H9J
BANK 1
BBWA2111E

Page 1437 of 3383

INFINITI QX56 2006 Factory Service Manual EC-226Revision: November 2009
DTC P0131, P0151 A/F SENSOR 1
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

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INFINITI QX56 2006 Factory Service Manual DTC P0131, P0151 A/F SENSOR 1EC-227
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Revision: November 2009 2006 QX56
BANK 2
BBWA2112E

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INFINITI QX56 2006 Factory Service Manual EC-228Revision: November 2009
DTC P0131, P0151 A/F SENSOR 1
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.

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INFINITI QX56 2006 Factory Service Manual DTC P0131, P0151 A/F SENSOR 1EC-229
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Revision: November 2009 2006 QX56
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect A/F sensor 1 harness connector

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