2005 INFINITI QX4 Factory Service Manual

Page 1361 of 3419

INFINITI QX4 2005  Factory Service Manual EC-170Revision: October 2005
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2005 QX56
BANK 2
BBWA1673E

Page 1362 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-171
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EC
Revision: October 20052005 QX56
Specification data are reference values and are measured between each terminal and ground.

Page 1363 of 3419

INFINITI QX4 2005  Factory Service Manual EC-172Revision: October 2005
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2005 QX56
2. CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 harness connector.
2. Turn ignition switch O

Page 1364 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-173
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Revision: October 20052005 QX56
5. CHECK HEATED OXYGEN SENSOR 2 HEATER
Refer to EC-173, "
Component Inspection" .
OK or NG

Page 1365 of 3419

INFINITI QX4 2005  Factory Service Manual EC-174Revision: October 2005
DTC P0101 MAF SENSOR
2005 QX56
DTC P0101 MAF SENSORPFP:22680
Component DescriptionUBS00H0V
The mass air flow sensor is placed in the stream of intake air. It mea-
sures th

Page 1366 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P0101 MAF SENSOR
EC-175
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Revision: October 20052005 QX56
DTC Confirmation ProcedureUBS00H0Y
Perform PROCEDURE FOR MALFUNCTION A first.
If the DTC cannot be confirmed, perf

Page 1367 of 3419

INFINITI QX4 2005  Factory Service Manual EC-176Revision: October 2005
DTC P0101 MAF SENSOR
2005 QX56
7. Maintain the following conditions for at least 10 consecutive sec-
onds.
8. If 1st trip DTC is detected, go to EC-178, "
Diagnostic Proce

Page 1368 of 3419

INFINITI QX4 2005  Factory Service Manual DTC P0101 MAF SENSOR
EC-177
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EC
Revision: October 20052005 QX56
Wiring DiagramUBS00H10
BBWA1674E