2007 INFINITI FX35 Service Manual

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Page 2217 of 4366

INFINITI FX35 2007 Service Manual DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER EC-841
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Revision: 2006 July 2007 FX35/FX45
Specification data are reference values and are measured b

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INFINITI FX35 2007 Service Manual EC-842
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DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
Revision: 2006 July 2007 FX35/FX45
2. CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT
1. Disconnect air fuel ratio (A/F) se

Page 2219 of 4366

INFINITI FX35 2007 Service Manual DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER EC-843
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Revision: 2006 July 2007 FX35/FX45
5. CHECK A/F SENSOR 1 HEATER
Refer to EC-843, "
Compone

Page 2220 of 4366

INFINITI FX35 2007 Service Manual EC-844
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2006 July 2007 FX35/FX45
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionNBS00434
SYSTEM DESCRIPTION
The ECM perfo

EC-844
[VK45DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2006 July 2007 FX35/FX45
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionNBS00434
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 ModeNBS00435
Specification data are reference values.
On Board Diagnosis LogicNBS00436
Sensor Input signal to ECM ECM function Actuator
Camshaft position sensor (PHASE)
Crankshaft position sensor (POS) Engine speed
Heated oxygen sensor 2
heater control Heated 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: 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
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 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.)
Heated 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.)
Heated oxygen sensor 2 heater
P0058
0058
(Bank 2)

Page 2221 of 4366

INFINITI FX35 2007 Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-845
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Revision: 2006 July 2007 FX35/FX45
DTC Confirmation ProcedureNBS00437
NOTE:
If DTC Confirmation Pro

Page 2222 of 4366

INFINITI FX35 2007 Service Manual EC-846
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2006 July 2007 FX35/FX45
Wiring DiagramNBS00438
BANK 1
TBWM1325E

Page 2223 of 4366

INFINITI FX35 2007 Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-847
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Revision: 2006 July 2007 FX35/FX45
Specification data are reference values and are measured between

Page 2224 of 4366

INFINITI FX35 2007 Service Manual EC-848
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2006 July 2007 FX35/FX45
BANK 2
TBWM1326E

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