2005 INFINITI QX4 Factory Service Manual

radio controls key fob OBD port bolt pattern technical specifications warning

Page 1417 of 3419

INFINITI QX4 2005 Factory Service Manual EC-226Revision: October 2005
DTC P0139, P0159 HO2S2
2005 QX56
DTC Confirmation ProcedureUBS00H2Q
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and

EC-226Revision: October 2005
DTC P0139, P0159 HO2S2
2005 QX56
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. Open engine hood.
8. Select “HO2S2 (B1) P0139” or “HO2S2 (B2) P0159” 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-231, "
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
PBIB2374E

Page 1418 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0139, P0159 HO2S2
EC-227
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MA
EC
Revision: October 20052005 QX56
6. Check the voltage when revving up to 4,000 rpm under no load
at least 10 times.
(Depress and release accelera

Page 1419 of 3419

INFINITI QX4 2005 Factory Service Manual EC-228Revision: October 2005
DTC P0139, P0159 HO2S2
2005 QX56
Wiring DiagramUBS00H2S
BANK 1
BBWA1678E

Page 1420 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0139, P0159 HO2S2
EC-229
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MA
EC
Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use E

Page 1421 of 3419

INFINITI QX4 2005 Factory Service Manual EC-230Revision: October 2005
DTC P0139, P0159 HO2S2
2005 QX56
BANK 2
BBWA1679E

Page 1422 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0139, P0159 HO2S2
EC-231
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H
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J
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MA
EC
Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use E

Page 1423 of 3419

INFINITI QX4 2005 Factory Service Manual EC-232Revision: October 2005
DTC P0139, P0159 HO2S2
2005 QX56
2. CLEAR THE SELF-LEARNING DATA
With CONSULT-II
1. Start engine and warm it up to normal operating temperature.
2. Select “SELF-LEARNIN

Page 1424 of 3419

INFINITI QX4 2005 Factory Service Manual DTC P0139, P0159 HO2S2
EC-233
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EC
Revision: October 20052005 QX56
3. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect heated oxygen sensor

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