2004 INFINITI FX35 Service Manual

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Page 2153 of 4449

INFINITI FX35 2004 Service Manual EC-812
[VK45DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2004 November 2004 FX35/FX45
2. CHECK HO2S1 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 1 harness connector.
2. Turn i

Page 2154 of 4449

INFINITI FX35 2004 Service Manual DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
EC-813
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Revision: 2004 November 2004 FX35/FX45
5. CHECK HEATED OXYGEN SENSOR 1 HEATER
Refer to EC-813, "
Component Inspect

Page 2155 of 4449

INFINITI FX35 2004 Service Manual EC-814
[VK45DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2004 November 2004 FX35/FX45
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionABS00C0V
SYSTEM DESCRIPTION
The ECM p

EC-814
[VK45DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2004 November 2004 FX35/FX45
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionABS00C0V
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 ModeABS00C0W
Specification data are reference values.
On Board Diagnosis LogicABS00C0X
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
nameDTC 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 2156 of 4449

INFINITI FX35 2004 Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-815
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Revision: 2004 November 2004 FX35/FX45
DTC Confirmation ProcedureABS00C0Y
NOTE:
If DTC Confirmation Procedure has

Page 2157 of 4449

INFINITI FX35 2004 Service Manual EC-816
[VK45DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2004 November 2004 FX35/FX45
Wiring DiagramABS00C0Z
BANK 1
TBWM0223E

Page 2158 of 4449

INFINITI FX35 2004 Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-817
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Revision: 2004 November 2004 FX35/FX45
Specification data are reference values and are measured between each termi

Page 2159 of 4449

INFINITI FX35 2004 Service Manual EC-818
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DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2004 November 2004 FX35/FX45
BANK 2
TBWM0224E

Page 2160 of 4449

INFINITI FX35 2004 Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-819
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Revision: 2004 November 2004 FX35/FX45
Specification data are reference values and are measured between each termi

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