2006 INFINITI QX56 Factory Service Manual

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Page 1369 of 3383

INFINITI QX56 2006 Factory Service Manual EC-158Revision: November 2009
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is me

Page 1370 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATEREC-159
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EC
Revision: November 2009 2006 QX56
BANK 2
BBWA2114E

Page 1371 of 3383

INFINITI QX56 2006 Factory Service Manual EC-160Revision: November 2009
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
2006 QX56
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is me

Page 1372 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATEREC-161
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Revision: November 2009 2006 QX56
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel

Page 1373 of 3383

INFINITI QX56 2006 Factory Service Manual EC-162Revision: November 2009
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
2006 QX56
6. CHECK INTERMITTENT INCIDENT
Perform EC-144, "
TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT" .
OK or NG
OK

Page 1374 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATEREC-163
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Revision: November 2009 2006 QX56
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionUBS00H0N
SYSTEM DESCRIPTIO

DTC P0037, P0038, P0057, P0058 HO2S2 HEATEREC-163
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Revision: November 2009 2006 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 ModeUBS00ODP
Specification data are reference values.
On Board Diagnosis LogicUBS00H0P
SensorInput 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 3,600 OFF
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 load ON
MONITOR ITEM
CONDITION SPECIFICATION
HO2S2 HTR (B1)
HO2S2 HTR (B2)
Engine speed: Above 3,600 rpm OFF
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 load ON
DTC No. Trouble diagnosis name
DTC detecting conditionPossible cause
P0037
0037
(Bank 1) Heated oxygen sensor 2
heater control circuit low The 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 high The 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 1375 of 3383

INFINITI QX56 2006 Factory Service Manual EC-164Revision: November 2009
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
2006 QX56
DTC Confirmation ProcedureUBS00H0Q
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ig

Page 1376 of 3383

INFINITI QX56 2006 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATEREC-165
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Revision: November 2009 2006 QX56
Wiring DiagramUBS00H0R
BANK 1
BBWA1672E

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