2004 INFINITI QX56 Air

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INFINITI QX56 2004  Factory Service Manual DTC P0125 ECT SENSOR
EC-179
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Revision: August 20072004 QX56
DTC Confirmation ProcedureUBS00H20
CAUTION:
Be careful not to overheat engine.
NOTE:
If DTC Confirmation Procedure

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INFINITI QX56 2004  Factory Service Manual EC-180Revision: August 2007
DTC P0125 ECT SENSOR
2004 QX56
3. CHECK THERMOSTAT OPERATION
When the engine is cold [lower than 70°C (158°F)] condition, grasp lower radiator hose and confirm the engine

Page 1372 of 3371

INFINITI QX56 2004  Factory Service Manual DTC P0127 IAT SENSOR
EC-181
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Revision: August 20072004 QX56
DTC P0127 IAT SENSORPFP:22630
Component DescriptionUBS00H24
The intake air temperature sensor is built into mass ai

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INFINITI QX56 2004  Factory Service Manual EC-182Revision: August 2007
DTC P0127 IAT SENSOR
2004 QX56
b. Select “DATA MONITOR” mode with CONSULT-II. 
c. Check the engine coolant temperature. 
d. If the engine coolant temperature is not les

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INFINITI QX56 2004  Factory Service Manual DTC P0127 IAT SENSOR
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Revision: August 20072004 QX56
Component InspectionUBS00H28
INTAKE AIR TEMPERATURE SENSOR
1. Check resistance between intake air temperature senso

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

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

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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