2007 INFINITI FX35 Service Manual

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Page 1641 of 4366

INFINITI FX35 2007 Service Manual DTC P0133, P0153 A/F SENSOR 1 EC-265
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Revision: 2006 July 2007 FX35/FX45
5. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm i

Page 1642 of 4366

INFINITI FX35 2007 Service Manual EC-266
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DTC P0133, P0153 A/F SENSOR 1
Revision: 2006 July 2007 FX35/FX45
6. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect air fuel ratio

Page 1643 of 4366

INFINITI FX35 2007 Service Manual DTC P0133, P0153 A/F SENSOR 1 EC-267
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Revision: 2006 July 2007 FX35/FX45
8. CHECK AIR FUEL RATIO (A/F) SENSOR 1 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

Page 1644 of 4366

INFINITI FX35 2007 Service Manual EC-268
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DTC P0133, P0153 A/F SENSOR 1
Revision: 2006 July 2007 FX35/FX45
11 . CHECK PCV VALVE
Refer to EC-50, "
POSITIVE CRANKCASE VENTILATION" .
OK or NG
OK >> GO TO 12.
NG >> Repair or

Page 1645 of 4366

INFINITI FX35 2007 Service Manual DTC P0137, P0157 HO2S2 EC-269
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Revision: 2006 July 2007 FX35/FX45
DTC P0137, P0157 HO2S2PFP:226A0
Component DescriptionNBS003TZ
The heated oxygen sensor

DTC P0137, P0157 HO2S2 EC-269
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Revision: 2006 July 2007 FX35/FX45
DTC P0137, P0157 HO2S2PFP:226A0
Component DescriptionNBS003TZ
The heated oxygen sensor 2 (HO2S2), after three way catalyst 1,
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 ModeNBS003U0
Specification data are reference values.
On Board Diagnosis LogicNBS003U1
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 1 causes the longer
switching time. To judge the malfunctions of heated oxygen sensor
2, ECM monitors whether the maximum voltage of the sensor is suf-
ficiently high 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 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
SEF259VA
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0137
0137
(Bank 1)
Heated oxygen sensor
2 circuit low voltage The maximum voltage from the sensor is not
reached to the specified voltage.
Harness or connectors
(Heated oxygen sensor 2 circuit is open
or shorted)
Heated oxygen sensor 2
Fuel pressure
Fuel injector
Intake air leaks
P0157
0157
(Bank 2)

Page 1646 of 4366

INFINITI FX35 2007 Service Manual EC-270
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DTC P0137, P0157 HO2S2
Revision: 2006 July 2007 FX35/FX45
DTC Confirmation ProcedureNBS003U2
NOTE:
If DTC confirmation Procedure has been previously conducted, always turn ignition sw

EC-270
[VQ35DE]
DTC P0137, P0157 HO2S2
Revision: 2006 July 2007 FX35/FX45
DTC Confirmation ProcedureNBS003U2
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.
WITH CONSULT-II
TESTING CONDITION:
For better results, perform DTC WORK SUPPORT at a temperature of 0 to 30 °C (32 to 86 °F).
1. Turn ignition switch ON and select “DATA MONITOR” mode with CONSULT-II.
2. Start engine and warm it up to the normal operating tempera- ture.
3. Turn ignition switch OFF and wait at least 10 seconds.
4. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
5. Let engine idle for 1 minute.
6. Make sure that “COOLAN TEMP/S” indicates more than 70 °C
(158 °F).
If not, warm up engine and go to next step when “COOLAN
TEMP/S” indication reaches to 70 °C (158 °F).
7. Open engine hood.
8. Select “HO2S2 (B1) P1147” (for DTC P0137) or “HO2S2 (B2) P1167” (for DTC P0157) of “HO2S2” in “DTC WORK SUPPORT” mode with CONSULT-II.
9. Start engine and following the instruction of CONSULT-II.
NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
10. Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”. If “NG” is displayed, refer to EC-275, "
Diagnostic Procedure" .
If “CAN NOT BE DIAGNOSED” is displayed, perform the following.
a. Turn ignition switch OFF and leave the vehicle in a cool place (soak the vehicle).
b. Return to step 1.
Overall Function CheckNBS003U3
Use this procedure to check the overall function of the heated oxygen sensor 2 circuit. During this check, a 1st
trip DTC might not be confirmed.
WITH GST
1. Start engine and warm it up to the normal operating temperature.
2. Turn ignition switch OFF and wait at least 10 seconds.
3. Start engine and keep the engine speed between 3,500 and 4,000 rpm for at least 1 minute under no load.
4. Let engine idle for 1 minute.
5. Set voltmeter probes between ECM terminal 74 [HO2S2 (B1) signal] or 55 [HO2S2 (B2) signal] and ground.
SEF174Y
PBIB2373E

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INFINITI FX35 2007 Service Manual DTC P0137, P0157 HO2S2 EC-271
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Revision: 2006 July 2007 FX35/FX45
6. Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(D

Page 1648 of 4366

INFINITI FX35 2007 Service Manual EC-272
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DTC P0137, P0157 HO2S2
Revision: 2006 July 2007 FX35/FX45
Wiring DiagramNBS003U4
BANK 1
TBWM1592E

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