2004 INFINITI QX56 Factory Service Manual

Page 1377 of 3371

INFINITI QX56 2004  Factory Service Manual EC-186Revision: August 2007
DTC P0138, P0158 HO2S2
2004 QX56
DTC P0138, P0158 HO2S2PFP:226A0
Component DescriptionUBS00H2F
The heated oxygen sensor 2, after three way catalyst (manifold),
monitors the

Page 1378 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0138, P0158 HO2S2
EC-187
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EC
Revision: August 20072004 QX56
DTC Confirmation ProcedureUBS00H2I
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Proce

Page 1379 of 3371

INFINITI QX56 2004  Factory Service Manual EC-188Revision: August 2007
DTC P0138, P0158 HO2S2
2004 QX56
Wiring DiagramUBS00H2J
BANK 1
BBWA11 58 E

Page 1380 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0138, P0158 HO2S2
EC-189
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EC
Revision: August 20072004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use EC

Page 1381 of 3371

INFINITI QX56 2004  Factory Service Manual EC-190Revision: August 2007
DTC P0138, P0158 HO2S2
2004 QX56
BANK 2
BBWA11 59 E

Page 1382 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0138, P0158 HO2S2
EC-191
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EC
Revision: August 20072004 QX56
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use EC

Page 1383 of 3371

INFINITI QX56 2004  Factory Service Manual EC-192Revision: August 2007
DTC P0138, P0158 HO2S2
2004 QX56
2. CHECK HO2S2 GROUND CIRCUIT FOR OPEN AND SHORT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Check harness continuity betwee

Page 1384 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0138, P0158 HO2S2
EC-193
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EC
Revision: August 20072004 QX56
4. CHECK HO2S2 INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness cont