2006 INFINITI M35 Factory Service Manual

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Page 2569 of 5621

INFINITI M35 2006 Factory Service Manual EC-1026
[VK45DE]
DTC P0138, P0158 HO2S2
Revision: 2006 January2006 M35/M45
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground ter

Page 2570 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0138, P0158 HO2S2
EC-1027
[VK45DE]
C
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Revision: 2006 January2006 M35/M45
2. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated

Page 2571 of 5621

INFINITI M35 2006 Factory Service Manual EC-1028
[VK45DE]
DTC P0138, P0158 HO2S2
Revision: 2006 January2006 M35/M45
4. CHECK HO2S2 CONNECTOR FOR WATER
Check connectors for water.
OK or NG
OK >> GO TO 5.
NG >> Repair or replace harness or con

Page 2572 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0138, P0158 HO2S2
EC-1029
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Revision: 2006 January2006 M35/M45
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating

Page 2573 of 5621

INFINITI M35 2006 Factory Service Manual EC-1030
[VK45DE]
DTC P0138, P0158 HO2S2
Revision: 2006 January2006 M35/M45
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor 2 harness co

Page 2574 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0138, P0158 HO2S2
EC-1031
[VK45DE]
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Revision: 2006 January2006 M35/M45
5. CHECK HEATED OXYGEN SENSOR 2
Refer to EC-1031, "
Component Inspection" .
OK or NG
OK >>

Page 2575 of 5621

INFINITI M35 2006 Factory Service Manual EC-1032
[VK45DE]
DTC P0138, P0158 HO2S2
Revision: 2006 January2006 M35/M45
Before installing new oxygen sensor, clean exhaust system threads using Oxygen Sensor Thread
Cleaner tool J-43897-18 or J-438

Page 2576 of 5621

INFINITI M35 2006 Factory Service Manual DTC P0139, P0159 HO2S2
EC-1033
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Revision: 2006 January2006 M35/M45
DTC P0139, P0159 HO2S2PFP:226A0
Component DescriptionNBS005F0
The heated oxygen sensor 2, afte

DTC P0139, P0159 HO2S2
EC-1033
[VK45DE]
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Revision: 2006 January2006 M35/M45
DTC P0139, P0159 HO2S2PFP:226A0
Component DescriptionNBS005F0
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 ModeNBS005F1
Specification data are reference values.
On Board Diagnosis LogicNBS005F2
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 ITEM CONDITION SPECIFICATION
HO2S2 (B1)
HO2S2 (B2)
Engine: After warming up
After keeping engine speed
between 3,500 and 4,000 rpm for
1 minute and at idle for 1 minute
under no loadRevving engine from idle up to 3,000 rpm
quickly.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 responseIt 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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