2007 INFINITI QX56 Factory Service Manual

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Page 1665 of 3061

INFINITI QX56 2007 Factory Service Manual EC-582
< SERVICE INFORMATION >
DTC P2138 APP SENSOR
DTC Confirmation Procedure
INFOID:0000000003532136
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OF

Page 1666 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P2138 APP SENSOR
EC-583
< SERVICE INFORMATION >
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Wiring DiagramINFOID:0000000003532137
Specification data are reference values and are measured between each terminal

Page 1667 of 3061

INFINITI QX56 2007 Factory Service Manual EC-584
< SERVICE INFORMATION >
DTC P2138 APP SENSOR
Diagnosis Procedure
INFOID:0000000003532138
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on t

Page 1668 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P2138 APP SENSOR
EC-585
< SERVICE INFORMATION >
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1. Disconnect accelerator pedal position (APP) sensor harness
connector.
2. Turn ignition switch ON.
3. Check voltag

Page 1669 of 3061

INFINITI QX56 2007 Factory Service Manual EC-586
< SERVICE INFORMATION >
DTC P2138 APP SENSOR
NG >> Repair short to ground or short to power in harness connectors.
6.CHECK THROTTLE POSITION SENSOR
Refer to EC-579, "
Component Inspection" .
OK

Page 1670 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P2138 APP SENSOR
EC-587
< SERVICE INFORMATION >
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>>INSPECTION END
Component InspectionINFOID:0000000003532139
ACCELERATOR PEDAL POSITION SENSOR
1. Reconnect all harn

Page 1671 of 3061

INFINITI QX56 2007 Factory Service Manual EC-588
< SERVICE INFORMATION >
DTC P2A00, P2A03 A/F SENSOR 1
DTC P2A00, P2A03 A/F SENSOR 1
Component DescriptionINFOID:0000000003532141
The air fuel ratio (A/F) sensor 1 is a planar one-cell limit cur

EC-588
< SERVICE INFORMATION >
DTC P2A00, P2A03 A/F SENSOR 1
DTC P2A00, P2A03 A/F SENSOR 1
Component DescriptionINFOID:0000000003532141
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:0000000003532142
Specification data are reference values.
On Board Diagnosis LogicINFOID:0000000003532143
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 ProcedureINFOID:0000000003532144
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.
PBIB3353E
PBIB3354E
MONITOR ITEM CONDITION SPECIFICATION
A/F SEN1 (B1)
A/F SEN1 (B2)• Engine: After warming up Maintaining engine speed at 2,000 rpm Fluctuates around 2.2V
DTC No. Trouble diagnosis name DTC detecting condition Possible Cause
P2A00
2A00
(Bank 1)
Air fuel ratio (A/F) sensor 1
circuit range/performance• The output voltage computed by ECM from the
A/F sensor 1 signal is shifted to the lean side for
a specified period.
• The A/F signal computed by ECM from the A/F
sensor 1 signal is shifted to the rich side for a
specified period.• A/F sensor 1
• A/F sensor 1 heater
• Fuel pressure
• Fuel injector
• Intake air leaks P2A03
2A03
(Bank 2)

Page 1672 of 3061

INFINITI QX56 2007 Factory Service Manual DTC P2A00, P2A03 A/F SENSOR 1
EC-589
< SERVICE INFORMATION >
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3. Turn ignition switch ON and select “SELF-LEARNING CONT” in “WORK SUPPORT” mode with CON-
SULT-II

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