Infiniti FX35 / FX45. Manual - part 348

 

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Infiniti FX35 / FX45. Manual - part 348

 

 

DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

EC-153

< SERVICE INFORMATION >

[VQ35DE]

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DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

Description

INFOID:0000000001325965

SYSTEM DESCRIPTION

The ECM performs ON/OFF duty control of the air fuel ratio (A/F) sensor 1 heater corresponding to the engine
operating condition to keep the temperature of air fuel ratio (A/F) sensor 1 element at the specified range.

CONSULT-III Reference Value in Data Monitor Mode

INFOID:0000000001325966

Specification data are reference values.

On Board Diagnosis Logic

INFOID:0000000001325967

DTC Confirmation Procedure

INFOID:0000000001325968

NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10.5V and 16V at
idle.
1.

Start engine and let it idle for at least 10 seconds.

2.

Check 1st trip DTC.

3.

If 1st trip DTC is detected, go to 

EC-157, "Diagnosis Procedure"

.

Sensor

Input Signal to ECM

ECM function

Actuator

Camshaft position sensor (PHASE)
Crankshaft position sensor (POS)

Engine speed

Air fuel ratio (A/F) sensor 1 
heater control

Air fuel ratio (A/F) sensor 1 heater

Mass air flow sensor

Amount of intake air

MONITOR ITEM

CONDITION

SPECIFICATION

A/F S1 HTR(B1)
A/F S1 HTR(B2)

• Engine: After warming up, idle the engine

0 - 100%

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P0031
0031
(Bank 1)

Air fuel ratio (A/F) sensor 
1 heater control circuit low

The current amperage in the heated air fuel ratio (A/
F) sensor 1 heater circuit is out of the normal range.
(An excessively low voltage signal is sent to ECM 
through the air fuel ratio (A/F) sensor 1 heater.)

• Harness or connectors

[Air fuel ratio (A/F) sensor 1 heater cir-
cuit is open or shorted.]

• Air fuel ratio (A/F) sensor 1 heater

P0051
0051
(Bank 2)

P0032
0032
(Bank 1)

Air fuel ratio (A/F) sensor 
1 heater control circuit 
high

The current amperage in the heated air fuel ratio (A/
F) sensor 1 heater circuit is out of the normal range.
(An excessively high voltage signal is sent to ECM 
through the air fuel ratio (A/F) sensor 1 heater.)

• Harness or connectors

[Air fuel ratio (A/F) sensor 1 heater cir-
cuit is shorted.]

• Air fuel ratio (A/F) sensor 1 heater

P0052
0052
(Bank 2)

EC-154

< SERVICE INFORMATION >

[VQ35DE]

DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

Wiring Diagram

INFOID:0000000001325969

BANK 1

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.

CAUTION:

TBWM1596E

DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

EC-155

< SERVICE INFORMATION >

[VQ35DE]

C

D

E

F

G

H

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J

K

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M

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EC

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Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

2

R/L

A/F sensor 1 heater
(bank 1)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 5V

16

G

A/F sensor 1 (bank 1)

[Engine is running]
• Warm-up condition
• Idle speed

Approximately 3.1V

35

B/R

Approximately 2.6V

56

L

Approximately 2.3V

75

R/B

Approximately 2.3V

PBIB1584E

EC-156

< SERVICE INFORMATION >

[VQ35DE]

DTC P0031, P0032, P0051, P0052 A/F SENSOR 1 HEATER

BANK 2

Specification data are reference values and are measured between each terminal and ground.
Pulse signal is measured by CONSULT-III.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TBWM1597E

 

 

 

 

 

 

 

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