Infiniti FX35 / FX45. Manual - part 349

 

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Infiniti FX35 / FX45. Manual - part 349

 

 

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

EC-157

< SERVICE INFORMATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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

Diagnosis Procedure

INFOID:0000000001325970

1.

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten ground screw on the body. Refer to 

EC-144, "Ground Inspection"

.

OK or NG

OK

>> GO TO 2.

NG

>> Repair or Replace ground connections.

2.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 POWER SUPPLY CIRCUIT

1.

Disconnect air fuel ratio (A/F) sensor 1 harness connector.

2.

Turn ignition switch ON.

TERMI-

NAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

24

L

A/F sensor 1 heater
(bank 2)

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

Approximately 5V

57

G

A/F sensor 1 (Bank 2)

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

Approximately 2.6V

58

Y

Approximately 2.3V

76

P

Approximately 3.1V

77

BR

Approximately 2.3V

PBIB1584E

PBIB2625E

PBIB2190E

EC-158

< SERVICE INFORMATION >

[VQ35DE]

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

3.

Check voltage between air fuel ratio sensor 1 terminal 3 and
ground with CONSULT-III or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E64, F65
• IPDM E/R harness connector E7
• 10A fuse
• Harness for open or short between air fuel ratio sensor 1 and fuse

>> Repair or replace harness or connectors.

4.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER OUTPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check harness continuity between ECM terminal 2 (bank 1) or 24 (bank 2) and air fuel ratio (A/F) sensor
1 terminal 4.
Refer to Wiring Diagram.

4.

Also check harness for short to ground and short to power.

OK or NG

OK

>> GO TO 5.

NG

>> Repair open circuit or short to ground or short to power in harness or connectors.

5.

CHECK AIR FUEL RATIO (A/F) SENSOR 1 HEATER

Refer to 

EC-158, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace malfunctioning air fuel ratio (A/F) sensor 1.

6.

CHECK INTERMITTENT INCIDENT

Perform 

EC-139

.

>> INSPECTION END

Component Inspection

INFOID:0000000001325971

AIR FUEL RATIO (A/F) SENSOR 1 HEATER

Voltage: Battery voltage

PBIB1683E

Continuity should exist.

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

EC-159

< SERVICE INFORMATION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

Check resistance between terminals 3 and 4.

Check continuity between terminals 3 and 1, 2, 5, 6, terminals 4 and
1, 2, 5, 6.

If NG, replace the air fuel ratio (A/F) sensor 1.

CAUTION:

• Discard any air fuel ratio (A/F) sensor which has been

dropped from a height of more than 0.5 m (19.7 in) onto a hard
surface such as a concrete floor; use a new one.

• Before installing new air fuel ratio (A/F) sensor, clean exhaust

system threads using Heated Oxygen Sensor Thread Cleaner
tool J-43897-18 or J-43897-12 and approved anti-seize lubri-
cant.

Removal and Installation

INFOID:0000000001325972

AIR FUEL RATIO (A/F) SENSOR 1

Refer to 

EM-26

.

Resistance: 2.3 - 4.3

 [at 25

°

C (77

°

F)]

Continuity should not exist.

PBIB1684E

EC-160

< SERVICE INFORMATION >

[VQ35DE]

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

DTC P0037, P0038, P0057, P0058 HO2S2 HEATER

Description

INFOID:0000000001325973

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-III Reference Value in Data Monitor Mode

INFOID:0000000001325974

Specification data are reference values.

On Board Diagnosis Logic

INFOID:0000000001325975

DTC Confirmation Procedure

INFOID:0000000001325976

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:

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

(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

(Heated oxygen sensor 2 heater circuit is 
shorted.)

• Heated oxygen sensor 2 heater

P0058
0058
(Bank 2)

 

 

 

 

 

 

 

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