2007 INFINITI FX35 Service Manual

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Page 2337 of 4366

INFINITI FX35 2007 Service Manual DTC P0138, P0158 HO2S2 EC-961
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Revision: 2006 July 2007 FX35/FX45
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to

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INFINITI FX35 2007 Service Manual EC-962
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DTC P0138, P0158 HO2S2
Revision: 2006 July 2007 FX35/FX45
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness c

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INFINITI FX35 2007 Service Manual DTC P0138, P0158 HO2S2 EC-963
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Revision: 2006 July 2007 FX35/FX45
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-963, "
Component Inspection" .
OK or N

Page 2340 of 4366

INFINITI FX35 2007 Service Manual EC-964
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DTC P0138, P0158 HO2S2
Revision: 2006 July 2007 FX35/FX45
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43

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INFINITI FX35 2007 Service Manual DTC P0139, P0159 HO2S2 EC-965
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Revision: 2006 July 2007 FX35/FX45
DTC P0139, P0159 HO2S2PFP:226A0
Component DescriptionNBS004LF
The heated oxygen sensor

DTC P0139, P0159 HO2S2 EC-965
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Revision: 2006 July 2007 FX35/FX45
DTC P0139, P0159 HO2S2PFP:226A0
Component DescriptionNBS004LF
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the oxygen level in the exhaust gas on each bank.
Even if switching characteristics of the air fuel ratio (A/F) sensor 1
are shifted, the air-fuel ratio is controlled to stoichiometric, by the sig-
nal from the heated oxygen sensor 2.
This sensor is made of ceramic zirconia. The zirconia generates volt-
age from approximately 1V in richer conditions to 0V in leaner condi-
tions.
Under normal conditions the heated oxygen sensor 2 is not used for
engine control operation.
CONSULT-II Reference Value in Data Monitor ModeNBS004LG
Specification data are reference values.
On Board Diagnosis LogicNBS0045W
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the A/F sensor 1. The oxygen storage
capacity of the three way catalyst (manifold) causes the longer
switching time. To judge the malfunctions of heated oxygen sensor
2, ECM monitors whether the switching response of the sensor's
voltage is faster than specified during the various driving condition
such as fuel-cut.
SEF327R
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 (B1)
HO2S2 (B2)
Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
–Engine: After warming up
–Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load 0 - 0.3V
←→ Approx. 0.6 -
1.0V
HO2S2 MNTR (B1)
HO2S2 MNTR (B2)
Revving engine from idle to 3,000 rpm quickly after the following conditions
are met.
–Engine: After warming up
–Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and at
idle for 1 minute under no load LEAN
←→ RICH
SEF302U
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0139
0139
(Bank 1) Heated oxygen sensor
2 circuit slow response It takes more time for the sensor to respond
between rich and lean than the specified time.
Harness or connectors
(The sensor circuit is open or shorted)
Heated oxygen sensor 2
Fuel pressure
Fuel injector
Intake air leaks
P0159
0159
(Bank 2)

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INFINITI FX35 2007 Service Manual EC-966
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DTC P0139, P0159 HO2S2
Revision: 2006 July 2007 FX35/FX45
DTC Confirmation ProcedureNBS0045X
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition sw

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INFINITI FX35 2007 Service Manual DTC P0139, P0159 HO2S2 EC-967
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Revision: 2006 July 2007 FX35/FX45
Overall Function CheckNBS0045Y
Use this procedure to check the overall function of the

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INFINITI FX35 2007 Service Manual EC-968
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DTC P0139, P0159 HO2S2
Revision: 2006 July 2007 FX35/FX45
Wiring DiagramNBS0045Z
BANK 1
TBWM1330E

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