2005 INFINITI FX35 Service Manual

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Page 2273 of 4731

INFINITI FX35 2005 Service Manual EC-880
[VK45DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2005 July 2005 FX
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is meas

Page 2274 of 4731

INFINITI FX35 2005 Service Manual DTC P0031, P0032, P0051, P0052 HO2S1 HEATER EC-881
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Revision: 2005 July 2005 FX
BANK 2
TBWM0222E

Page 2275 of 4731

INFINITI FX35 2005 Service Manual EC-882
[VK45DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2005 July 2005 FX
Specification data are reference values and are measured between each terminal and ground.
Pulse signal is meas

Page 2276 of 4731

INFINITI FX35 2005 Service Manual DTC P0031, P0032, P0051, P0052 HO2S1 HEATER EC-883
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Revision: 2005 July 2005 FX
2. CHECK HO2S1 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor

Page 2277 of 4731

INFINITI FX35 2005 Service Manual EC-884
[VK45DE]
DTC P0031, P0032, P0051, P0052 HO2S1 HEATER
Revision: 2005 July 2005 FX
5. CHECK HEATED OXYGEN SENSOR 1 HEATER
Refer to EC-884, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
N

Page 2278 of 4731

INFINITI FX35 2005 Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-885
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Revision: 2005 July 2005 FX
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionABS007J4

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-885
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Revision: 2005 July 2005 FX
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionABS007J4
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 ModeABS007J5
Specification data are reference values.
On Board Diagnosis LogicABS007J6
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.)
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 2279 of 4731

INFINITI FX35 2005 Service Manual EC-886
[VK45DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2005 July 2005 FX
DTC Confirmation ProcedureABS007J7
NOTE:
If DTC Confirmation Procedure has been previously conducted, always tu

Page 2280 of 4731

INFINITI FX35 2005 Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER EC-887
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Revision: 2005 July 2005 FX
Wiring DiagramABS007J8
BANK 1
TBWM0223E

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