2004 INFINITI QX56 Factory Service Manual

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Page 1385 of 3371

INFINITI QX56 2004 Factory Service Manual EC-194Revision: August 2007
DTC P0138, P0158 HO2S2
2004 QX56
Component InspectionUBS00H2L
HEATED OXYGEN SENSOR 2
With CONSULT-II
1. Turn ignition switch ON and select “DATA MONITOR” mode with
CON

Page 1386 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0138, P0158 HO2S2
EC-195
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6. Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerat

Page 1387 of 3371

INFINITI QX56 2004 Factory Service Manual EC-196Revision: August 2007
DTC P0139, P0159 HO2S2
2004 QX56
DTC P0139, P0159 HO2S2PFP:226A0
Component DescriptionUBS00H2N
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the

Page 1388 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0139, P0159 HO2S2
EC-197
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DTC Confirmation ProcedureUBS00H2Q
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn

DTC P0139, P0159 HO2S2
EC-197
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DTC Confirmation ProcedureUBS00H2Q
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. Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” of “HO2S2” in “DTC WORK SUPPORT” mode with
CONSULT-II.
8. Start engine and following the instruction of CONSULT-II.
9. Make sure that “OK” is displayed after touching “SELF-DIAG RESULTS”.
If “NG” is displayed, refer to EC-202, "
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 CheckUBS00H2R
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 55 [HO2S2 (B1) signal] or 74 [HO2S2 (B2) signal] and
ground.
SEF 1 74 Y
PBIB0115E

Page 1389 of 3371

INFINITI QX56 2004 Factory Service Manual EC-198Revision: August 2007
DTC P0139, P0159 HO2S2
2004 QX56
6. Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelerator pedal as soon as possib

Page 1390 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0139, P0159 HO2S2
EC-199
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Revision: August 20072004 QX56
Wiring DiagramUBS00H2S
BANK 1
BBWA11 58 E

Page 1391 of 3371

INFINITI QX56 2004 Factory Service Manual EC-200Revision: August 2007
DTC P0139, P0159 HO2S2
2004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when me

Page 1392 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0139, P0159 HO2S2
EC-201
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Revision: August 20072004 QX56
BANK 2
BBWA11 59 E

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