2007 INFINITI M35 Factory Service Manual

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INFINITI M35 2007 Factory Service Manual EC-176
[VQ35DE]
DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER
Revision: 2007 April2007 M35/M45
5. CHECK A/F SENSOR 1 HEATER
Refer to EC-176, "
Component Inspection" .
OK or NG
OK >> GO TO 6.
NG >

Page 1706 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-177
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Revision: 2007 April2007 M35/M45
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionNBS004U8
SYSTEM D

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-177
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Revision: 2007 April2007 M35/M45
DTC P0037, P0038, P0057, P0058 HO2S2 HEATERPFP:226A0
DescriptionNBS004U8
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 ModeNBS004U9
Specification data are reference values.
On Board Diagnosis LogicNBS004UA
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: 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.)
Heated 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.)
Heated oxygen sensor 2 heater P0058
0058
(Bank 2)

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INFINITI M35 2007 Factory Service Manual EC-178
[VQ35DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2007 April2007 M35/M45
DTC Confirmation ProcedureNBS004UB
NOTE:
If DTC Confirmation Procedure has been previously conducted, alway

Page 1708 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-179
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Revision: 2007 April2007 M35/M45
Wiring DiagramNBS004UC
BANK 1
TBWT1470E

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INFINITI M35 2007 Factory Service Manual EC-180
[VQ35DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2007 April2007 M35/M45
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not

Page 1710 of 4647

INFINITI M35 2007 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
EC-181
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Revision: 2007 April2007 M35/M45
BANK 2
TBWT1471E

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INFINITI M35 2007 Factory Service Manual EC-182
[VQ35DE]
DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
Revision: 2007 April2007 M35/M45
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not

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INFINITI M35 2007 Factory Service Manual DTC P0037, P0038, P0057, P0058 HO2S2 HEATER
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Revision: 2007 April2007 M35/M45
2. CHECK HO2S2 POWER SUPPLY CIRCUIT
1. Disconnect heated oxygen sensor 2 harness

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