2008 INFINITI FX35 Service Manual

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Page 2081 of 3924

INFINITI FX35 2008 Service Manual
DTC P0138, P0158 HO2S2EC-841
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To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the minimum voltage of sensor i

DTC P0138, P0158 HO2S2EC-841
< SERVICE INFORMATION > [VK45DE]
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To judge the malfunctions of heated oxygen sensor 2, ECM monitors
whether the minimum voltage of sensor is sufficiently low during the
various driving condition such as fuel-cut.
DTC Confirmation ProcedureINFOID:0000000001326683
Perform PROCEDURE FOR MALFUNCTION A first.
If DTC cannot be confirmed, perform PROCEDURE FOR MALFUNCTION B.
NOTE:
If DTC Confirmation Procedure has been previously conduc
ted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
PROCEDURE FOR MALFUNCTION A
With CONSULT-III
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 2 minutes.
5. Check 1st trip DTC.
6. If 1st trip DTC is detected, go to EC-846, "
Diagnosis Procedure".
PROCEDURE FOR MALFUNCTION B
With CONSULT-III
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 “COOLAN TEMP/S” in “DATA MONITOR” mode with CONSULT-III.
2. Start engine and warm it up to the normal operating temperature.
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) P1146” (for DTC P0138) or “HO2S2 (B2) P1166” (for DTC P0158) of “HO2S2” in
“DTC WORK SUPPORT” mode with CONSULT-III.
9. Start engine and follow the instruction of CONSULT-III. NOTE:
It will take at most 10 minutes until “COMPLETED” is displayed.
PBIB2376E
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0138
0138
(Bank 1) Heated oxygen sensor 2
circuit high voltage A)
An excessively high voltage from the sen-
sor is sent to ECM. Harness or connectors
(The sensor circuit is open or shorted)
Heated oxygen sensor 2
P0158
0158
(Bank 2) B)
The minimum voltage from the sensor is
not reached to the specified voltage. Harness or connectors
(The sensor circuit is open or shorted)
Heated oxygen sensor 2
Fuel pressure
Fuel injector
3AA93ABC3ACD3AC03ACA3AC03AC63AC53A913A773A893A873A873A8E3A773A983AC73AC93AC03AC3
3A893A873A873A8F3A773A9D3AAF3A8A3A8C3A863A9D3AAF3A8B3A8C

Page 2082 of 3924

INFINITI FX35 2008 Service Manual
EC-842
< SERVICE INFORMATION >[VK45DE]
DTC P0138, P0158 HO2S2
10. Make sure that “OK” is display
ed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to EC-846, "
Diagnosis

Page 2083 of 3924

INFINITI FX35 2008 Service Manual
DTC P0138, P0158 HO2S2EC-843
< SERVICE INFORMATION > [VK45DE]
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Wiring DiagramINFOID:0000000001326685
BANK 1
Specification data are reference values
and are measured be

Page 2084 of 3924

INFINITI FX35 2008 Service Manual
EC-844
< SERVICE INFORMATION >[VK45DE]
DTC P0138, P0158 HO2S2
TER-
MI-
NAL
NO. WIRE
COLOR ITEM CONDITION DATA (DC Voltage)
6R Heated oxygen sensor 2
heater (Bank 1) [Engine is running]
Engine sp

Page 2085 of 3924

INFINITI FX35 2008 Service Manual
DTC P0138, P0158 HO2S2EC-845
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BANK 2
Specification data are reference values
and are measured between each terminal and ground.
CAUTIO

Page 2086 of 3924

INFINITI FX35 2008 Service Manual
EC-846
< SERVICE INFORMATION >[VK45DE]
DTC P0138, P0158 HO2S2
Diagnosis Procedure
INFOID:0000000001326686
PROCEDURE FOR MALFUNCTION A
1.CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen

Page 2087 of 3924

INFINITI FX35 2008 Service Manual
DTC P0138, P0158 HO2S2EC-847
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1. Disconnect heated oxygen sensor 2 harness connector.
2. Disconnect ECM harness connector.
3. Check har

Page 2088 of 3924

INFINITI FX35 2008 Service Manual
EC-848
< SERVICE INFORMATION >[VK45DE]
DTC P0138, P0158 HO2S2
Refer to
EC-850, "Component Inspection".
OK or NG
OK >> GO TO 6.
NG >> Replace malfunctioning heated oxygen sensor 2.
6.CHECK INTERMITTE

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