2007 INFINITI QX56 Factory Service Manual

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Page 1321 of 3061

INFINITI QX56 2007 Factory Service Manual EC-238
< SERVICE INFORMATION >
DTC P0131, P0151 A/F SENSOR 1
BANK 2
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-II.
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Page 1322 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0131, P0151 A/F SENSOR 1
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< SERVICE INFORMATION >
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: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)
Diagnosis Proced

Page 1323 of 3061

INFINITI QX56 2007 Factory Service Manual EC-240
< SERVICE INFORMATION >
DTC P0131, P0151 A/F SENSOR 1
3. Check voltage between A/F sensor 1 terminal 4 and ground with
CONSULT-II or tester.
OK or NG
OK >> GO TO 4.
NG >> GO TO 3.
3.DETECT MALF

Page 1324 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0131, P0151 A/F SENSOR 1
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< SERVICE INFORMATION >
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6.REPLACE AIR FUEL RATIO (A/F) SENSOR 1
Replace malfunctioning air fuel ratio (A/F) sensor 1.
CAUTION:
•

Page 1325 of 3061

INFINITI QX56 2007 Factory Service Manual EC-242
< SERVICE INFORMATION >
DTC P0132, P0152 A/F SENSOR 1
DTC P0132, P0152 A/F SENSOR 1
Component DescriptionINFOID:0000000003531751
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit cur

EC-242
< SERVICE INFORMATION >
DTC P0132, P0152 A/F SENSOR 1
DTC P0132, P0152 A/F SENSOR 1
Component DescriptionINFOID:0000000003531751
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit current sen-
sor. The sensor element of the A/F sensor 1 is composed an elec-
trode layer, 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.
The exhaust gas components diffuse through the diffusion layer at
the sensor cell. An electrode layer is applied voltage, and this current
relative oxygen density in lean. Also this current relative hydrocar-
bon density in rich.
Therefore, the A/F sensor 1 is able to indicate air fuel ratio by this
electrode layer of current. In addition, a heater is integrated in the
sensor to ensure the required operating temperature of about 800°C
(1,472°F).
CONSULT-II Reference Value in Data Monitor ModeINFOID:0000000003531752
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000003531753
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 ProcedureINFOID:0000000003531754
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.
PBIB3353E
PBIB3354E
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)
A/F SEN1 (B2)• Engine: After warming upMaintaining engine speed at
2,000 rpmFluctuates around 2.2V
DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P0132
0132
(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. 5V.• Harness or connectors
(The A/F sensor 1 circuit is open or
shorted.)
• Air fuel ratio (A/F) sensor 1 P0132
0132
(Bank 2)

Page 1326 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0132, P0152 A/F SENSOR 1
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< SERVICE INFORMATION >
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3. Check “A/F SEN1 (B1)” or “A/F SEN1 (B2)” indication.
If the indication is constantly approx. 5V,

Page 1327 of 3061

INFINITI QX56 2007 Factory Service Manual EC-244
< SERVICE INFORMATION >
DTC P0132, P0152 A/F SENSOR 1
Wiring Diagram
INFOID:0000000003531755
BANK 1
Specification data are reference values and are measured between each terminal and ground.
Pu

Page 1328 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P0132, P0152 A/F SENSOR 1
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< SERVICE INFORMATION >
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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the

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