2006 INFINITI QX56 Factory Service Manual

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Page 1481 of 3383

INFINITI QX56 2006 Factory Service Manual EC-270Revision: November 2009
DTC P0138, P0158 HO2S2
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when

Page 1482 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0138, P0158 HO2S2EC-271
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Revision: November 2009 2006 QX56
2. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Dis

Page 1483 of 3383

INFINITI QX56 2006 Factory Service Manual EC-272Revision: November 2009
DTC P0138, P0158 HO2S2
2006 QX56
4. CHECK HO2S2 CONNECTOR FOR WATER
Check connectors for water.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness or connectors.
5.

Page 1484 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0138, P0158 HO2S2EC-273
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Revision: November 2009 2006 QX56
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temperatur

Page 1485 of 3383

INFINITI QX56 2006 Factory Service Manual EC-274Revision: November 2009
DTC P0138, P0158 HO2S2
2006 QX56
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness connector.
3.

Page 1486 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0138, P0158 HO2S2EC-275
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Revision: November 2009 2006 QX56
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-275, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >> Repla

Page 1487 of 3383

INFINITI QX56 2006 Factory Service Manual EC-276Revision: November 2009
DTC P0138, P0158 HO2S2
2006 QX56
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-43897-12 and a

Page 1488 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0139, P0159 HO2S2EC-277
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Revision: November 2009 2006 QX56
DTC P0139, P0159 HO2S2PFP:226A0
Component DescriptionUBS00H2N
The heated oxygen sensor 2, after three way catal

DTC P0139, P0159 HO2S2EC-277
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Revision: November 2009 2006 QX56
DTC P0139, P0159 HO2S2PFP:226A0
Component DescriptionUBS00H2N
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 ModeUBS00H2O
Specification data are reference values.
On Board Diagnosis LogicUBS00H2P
The heated oxygen sensor 2 has a much longer switching time
between rich and lean than the air fuel ratio (A/F) sensor 1. The oxy-
gen 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 sen-
sor's voltage is faster than specified during the various driving condi-
tion such as fuel-cut.
SEF327R
MONITOR ITEMCONDITION SPECIFICATION
HO2S2 (B1)
HO2S2 (B2)
Revving engine from idle to 3,000 rpm quickly after the following condi-
tions 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) 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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