2004 INFINITI QX56 Factory Service Manual

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Page 1329 of 3371

INFINITI QX56 2004 Factory Service Manual EC-138Revision: August 2007
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2004 QX56
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionUBS00H0N
SYSTEM DESCRIPTION
The ECM performs ON/OFF co

EC-138Revision: August 2007
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2004 QX56
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionUBS00H0N
SYSTEM DESCRIPTION
The ECM performs ON/OFF control of the heated oxygen sensor 2 heater corresponding to the engine speed,
amount of intake air and engine coolant temperature.
OPERATION
CONSULT-II Reference Value in Data Monitor ModeUBS00H0O
Specification data are reference values.
On Board Diagnosis LogicUBS00H0P
Sensor Input signal to ECM ECM function Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)Engine speed
Heated oxygen sensor 2
heater controlHeated oxygen sensor 2 heater
Engine coolant temperature sensor Engine coolant temperature
Mass air flow sensor Amount of intake air
Engine speed rpm Heated oxygen sensor 2 heater
Above 3,600OFF
Below 3,600 rpm after the following conditions are met.
Engine: After warming up
Keeping the engine speed between 3,500 and 4,000 rpm for 1
minute and at idle for 1 minute under no loadON
MONITOR ITEM CONDITION SPECIFICATION
HO2S2 HTR (B1)
HO2S2 HTR (B2)
Engine speed is below 3,600 rpm after the following conditions are met.
–Engine: After warming up
–Keeping the engine speed between 3,500 and 4,000 rpm for 1 minute and
at idle for 1 minute under no loadON
Engine speed: Above 3,600 rpm OFF
DTC No. Trouble diagnosis name DTC detecting condition Possible cause
P0037
0037
(Bank 1)
Heated oxygen sensor 2
heater control circuit lowThe current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM
through the heated oxygen sensor 2 heater.)
Harness or connectors
(The heated oxygen sensor 2 heater
circuit is open or shorted.)
Heater oxygen sensor 2 heater P0057
0057
(Bank 2)
P0038
0038
(Bank 1)
Heated oxygen sensor 2
heater control circuit highThe current amperage in the heated oxygen sen-
sor 2 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to
ECM through the heated oxygen sensor 2
heater.)
Harness or connectors
(The heated oxygen sensor 2 heater
circuit is shorted.)
Heater oxygen sensor 2 heater P0058
0058
(Bank 2)

Page 1330 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-139
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Revision: August 20072004 QX56
DTC Confirmation ProcedureUBS00H0Q
NOTE:
If DTC Confirmation Procedure has been previously c

Page 1331 of 3371

INFINITI QX56 2004 Factory Service Manual EC-140Revision: August 2007
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2004 QX56
Wiring DiagramUBS00H0R
BANK 1
BBWA11 56 E

Page 1332 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-141
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Revision: August 20072004 QX56
Specification data are reference values and are measured between each terminal and ground.
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Page 1333 of 3371

INFINITI QX56 2004 Factory Service Manual EC-142Revision: August 2007
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2004 QX56
BANK 2
BBWA11 57 E

Page 1334 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-143
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Revision: August 20072004 QX56
Specification data are reference values and are measured between each terminal and ground.
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Page 1335 of 3371

INFINITI QX56 2004 Factory Service Manual EC-144Revision: August 2007
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2004 QX56
2. DETECT MALFUNCTIONING PART
Check the following.
Harness connectors E5, F14
IPDM E/R connector E119
10A fuse
Har

Page 1336 of 3371

INFINITI QX56 2004 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-145
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Revision: August 20072004 QX56
Component InspectionUBS00H0T
HEATED OXYGEN SENSOR 2 HEATER
1. Check resistance between HO2S2

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